Lap timing, data logging systems
 

I am posting in the race section so I dont think I need to emphasizes the usefullness and importance of lap timing and data logging.

However I am interested in knowing what systems, hardware and software people are using because I am in the market for a new electronic goodie. I am only a 8-10 weekend a year warrior so I can justify spending $1000's of dollars but simply knowing my lap times is no longer good enough for me.

What I am looking for is a GPS based lap timer that will record and display lap times, speed, g's, acceleration and deceleration rates. (all the basics).

Additionaly I would like something that has an OBD'2 reader so that I can review throttle position and RPM along side my speeds and lap times. I already have a MSD Dashawk which can data log and display all the OBD readings but haveing one product that does it all would be nice.

What I have found so far.

Racelogic Vbox PerformanceBox $500 and DriftBox $750: http://www.vboxusa.com/performancedrift/

The PerformanceBox and DriftBox are a small GPS unit that is designed for the sole purpose of lap timing. Using a 10HZ GPS receiver it does all the speed, accerlation, deceleration, HP calculations you would expect but it has no OBD2 input. If you spend an additional $250 and have additional sensors it is possible to record additional perameters like RPM, throttle position and more.

If you spring for the driftbox you get a Yaw Rate sensor, and it calculates your vehicle's drift/slip angle. This can be usefull for track guys because it shows over and understeer.

ECUDatascan $499: http://www.ecudatascan.com/home.html

It is primarly marketed as an OBD2 reader/display. It Has all the typical OBD2 reader functionsincluding guages and data logging. The ECUdatascan also has a built in GPS (probably only 1HZ) but does not come with navigation software. It is however marketed as a lap timer. However with only a 1HZ internal GPS receiver, lap timing may not be great. They also don't say anything about calculating g's.

RaceChrono Touchscreen ($449) and Racechrono TS Pro (with external gps) ($549) With OBD2 bundle ($599)http://mh-motorsports.com/laptimers.htm

It was designed and marketed as a GPS lap timer and if you get the OBD2 bundle it will data log as well. All the GPS functions you would expect and it receives all the OBD2 perameters as well. It does not apear to allow you to read and clear trouble codes (so keep your accessport handy) it also does not look like it functions as a navigation or multimedia system.

Correction: The Racechrono pro w/obd2 will allow you to read and clear trouble codes but it only allows you to view 1 OBD2 perameter at a time. To view others, you must tough the screen to scroll through the slected perameters.

A navigation system can be added.

Dashdaq $550 or $700 (with GPS Nav): http://www.dashdaq.com/

The dashdaq is a linux based system that does just about everything I want and more. It has an OBD2 reader, guages, datalogging, optional gps navigation and will even play music, videos and games. The missing feature is the lap timing, Yes the advertise it can be used as a lap timer but it requires a blackline fuel gps 10HZor 20HZ receiver. The blackline unit is no longer sold and even if you find one it is very expensive. According to Drew tech (makers of the dashdaq) they might consider making it compatible with another gps receiver, but unless they do, I will not buy it. Even if you get the lap timing feature, I am not sure how good the lap timing software is. On the plus side, the dashdaq is linux based and allows additional sensors like a AFR wideband to be added.

Overview:

If all you want is a lap timer, the PerformanceBox is probably as good as anything under $1000. If you want a lap timer with additional features the RaceChono Touchscreen Pro with OBD2 would be the best choice. The ECUdatascan looks like a great value with a lot of potential but without better track software and the ability to add an external OBD2 receiver it will not cut the mustard as a lap timer. Like the ECUdatascan, the Dashdaq is so close but not close enough. It has a lot of nice features but without the external GPS it wont even function as a lap timer and even if it does, the track software does not look as good as the racechrono or performancebox.

Own built Carpc, for GPS logging I use Racechrono and for engine/OBD2 logging I use an ELMscan5 and Dashcommand V2.

Love this setup! racechrono has alot of downloadable tracks atleast for Europe but I think US is supported aswell.

happy logging! =)

I always was under the impression that OBDII data logging was not very useful due to the slow rate of information transfer. Possibly the only good things to log for OBDII would be maybe temperature sensors like coolant and air intake. It's usually not fast enough for tps monitoring and the like.

If you step to CAN bus, then that's different. CAN bus definitely has the transfer speed for logging. The RX-8 uses CAN bus, you can't hook a regular generic scan tool to the OBDII port.

I didn't click your links, but does someone manufacture a "generic" type CAN logger? I've only seen specific modules for corvettes, and possibly evos?

-Jack

Its fast enough.

Yes, because RX8s use the can bus.

Anyone else use a GPS lap timer? Maybe all the track guys in the garage changing oil, changing their brakes and tires to get ready for the weekend?

I've been using the Racelogic Performance Box for the last couple of years.

When lapping the display can highlight lap or split time (you can set up to 6 splits I think) and exit corner speed whatever your focus happens to be at the time.

Its real value though is the Performance Tool software. You can hook up the Box to your laptop after a session and compare up to 4 laps from any session of any section of the track. Gives start end average speeds acceleration deceleration readings etc. If you have downloaded the track map you can compare line and apex to see how consistent you are.

I find it quite useful really and sufficient for my needs. My track time is very similar to yours.

Too much to go into here...but couple things...for decent track data your need 20HZ minimum or 40 HZ gps data points. Do the calculations and see how far between points at 100mph. Some say OBD2 polling is fast enough...?? huh??? ...you don't need fast for what there is there anyway, nor should you request excessive polling of parameters and possibly interrupting the ECUs work when it needs pretty much exclusive aceess.

As to possibilities, Traqmate get you all that is needed (except OBD data which can be recorded separately w/something else, sadly) w/external digital and analog inputs, but most important...the sw supplies the data back to you in a useable way to improve your performance.... the sw is the all important factor.

10hz is 10 data points per sec. 100 mph = approximately 150 feet second, so 15 feet between points (less for slower speeds). Thats not even a car length. 10HZ is fine. Yes 20HZ or 40HZ would be nice but it gets a little too pricy and provides very little additional benefit for the weekend warrier. Most of our cars were tunned off OBD2 polling and datalogged while being dyno test or during WOT runs, so I think the obd2 is up to the task.

I have looked at the traqmate and they over a lot of nice products, but the basic is $700, you have to spend $1000 to get any kind of display. What sets the traqmate apart from others is the ease of adding an HD camara system and their GPS track mapping uses accelerometers and not just GPS.

Spin9k: According to your signature you have the dashdaq. I am guessing you dont have blackline GPS, so no the lap timing feature, but aside from that would you give you opinion on the product.

Additional information about the Racechrono pro w/obd2 bundle:

The display will allow you to view only 1 obd2 perameter at a time but it will data log all other guages. You can switch between selected OBD2 perameters by touching the screen.

A gps navigation system can be added to the racechrono pro.

Chase Cams and RLC Racing are making a joint cam/datalog venture

http://www.rlcracing.com/track-commander.htm

http://www.chasecam.com/catalog/26



.

Very nice, just more then I want to spend. Tempting though.

Sorry Highway, but concerning specifically the Traqmate, but it applies to any data logger, you are missing important points, and emphasizing some which are inconsequential. The Traqmate basic is all that is required, the ‘Display’ unit adds a couple ‘nice’ features, but in reality they are convenience features, not important to the actual function of data logging. By that I mean, you are NOT, under any reasonable circumstances, going to be staring at the display during a track session. To think you will be is a mistake. The display is small, the characters are small, and … Simple fact of life, there just isn’t time to switch visual focus to the unit for more than a fraction of a second occassionaly.

Lol, you know it turns out there are only two ways I really use the display. First, is when I’m driving on the street and I display the actual calculated MPH speed so I can be just slightly less than 10mph over the speed limit. The speedometer is off quite a bit, and I want to be sure I don’t get a ticket, yet go as fast as I can safely. It works great for that. Second, on track you can have it hold the previous lap time for a predetermined number of seconds (like 30 sec) so you can see if you are improving over previous laps. I occasionally get a chance to glance at that, but not often. And I have the display mounted on the steering column right in front of me, but the change of focus to it is not easy to do while maintaining track focus. Bottom line, if you are $$$ strapped, get only the basic pkg.

Where the unit excels is allowing you to as they say “Replay your day”. On your PC you can slice and dice and go over each facet of the session, each and every lap to see what you did right and wrong. That’s where the recording resolution come in. For example, 100mph=136.26ft. So at 10 samples/sec you see one data point per 13 ft. You say that’s good enough? Well it’s not. Think of an apex, 13 ft is about a car length, and with that can can’t see whether you got to the correct place on track or not with that little resolution. In fact, with even 20/sec you can see still ‘the jaggies’ on your PC where the unit zigzags between points as you round a curve. Bottom line, the more data per unit time, the better. Important point to keep front and center-----You’re not recording for while you’re driving but for detailed analysis later on your PC. With the Traqmate, you choose 10, 20 (default) or 40 data point/sec. It’s only memory it’s filling, the unit is capable enough for all those speeds. Some others are not.

Beyond capability of hardware, again it’s the software analysis AFTER the fact that important, and what any unit’s TRUE WORTH should be judged on the SOFTWARE supplied, more than anything else. The Traqmate excels at that, and is worth every penny.

It's cool. I like it. I mostly use it as a GPS as I don't have it in my RX-8. I don't know what the blackline is, but i think it can do timing. I'd rather use the Traqmate for that though. It has a powerful enough processor in it to display/and or record, I forget, like 8 parameters at a time (other units can't do that many simultaneously). The display is customizable, they give you a bunch of displays and you can assign any paramter to any display graphic. There's a bunch of useful parameters, everything I could ever want to record or watch live.

Mostly I display common things I want to monitor and of course you can set limits and alarms on anything.

Posting from an android so I will be quick. I recently got the vbox lap timer. You are welcome to try it out if we meet at the track again.

Thats why I said it was fast enough ;-)

I dont think it would be any problems pulling OBD2 data during race, havent heard anyone saying it could be a problem.

i have not everything but I have been using RaceChrono, a 5Hz BT GPS and a BT OBD key and a Nokia phone (n95) since RaceChrono is in it's infant stage.

Work like a charm. Cheapest way to go around it. For N95 there is a TV out and some guys installed the N95 neatly into the car and have a huge screen. He has put that on YouTube (a VolksWagon).

If you spent big then performance box. No fuss. User friendly and it is a complete package with at least 10hz GPS.

20hz GPS Spin9k??? You must be very sensitive. I am happy with 5hz and within 0.05 sec of lap time. I don't think my driving has ever been that consistent to warrant that good of a system :D

^ selection of responses about choice of data point frequency...

"We recommend 20Hz because the graphs will be considerably smoother, the data points are closer together so the timing is more accurate, and at 20Hz there is still some redundancy so there are less dropouts."

"I would use 40Hz for drag racing, 20Hz for most road racing, 10Hz for 10+ hour endurance races."

"At 20 samples per second you should be fine for most tracks unless you need hyper-detailed information imo."

------------------------------------Interestingly I also found this info------------------------------------

- How does it [Traqmate] interpolate the accelerometer position & speed versus the GPS one? Since the GPS position is only 4hz and you can sample at 40hz – I assume every 10th position reading would be ‘real’?

Answer: Well actually all position readings are real since they are based on actual data readings. We use the G forces to predict the motion of the vehicle between GPS points and to correct bad GPS readings. 'Interpolation' is a correct term but we do far more than a linear approximation since acceleration in multiple axes records curvature.

Accelerometers are more accurate over a short distance and the GPS over a large distance so we use both to come up with the most accurate representation of what the vehicle is doing.

- How much memory does the [Traqmate] DU have? Or, what is the approximate recording time at 10,20,40hz?

Approximate record times:
10Hz - 11 hours
20Hz - 6 hours
40Hz - 3 hours

good points by all.
I agree for the weekend warrior that takes his DD to the track, it is easy to obtain " to much data".
There is no substitution for seat time. That is the best data collection system out there.
Now to voice one of my pet peeves.
Unless your car is set up with the proper safety equipment to drive 10/10's --dont worry about lap times. If you car is set up to drive 1010's then get a real data collection system like track mate. Its a great system and you can compare lap's with others and one thing that hasnt been mentioned---you can sell it anytime to want too for about what you paid for it.
It has great support and can be taken as far as you want.
The ga boys have been satisfied with in car video and some trac mate useage. Remeber also a trac mate can be installed pretty quickly--shared ownership is common.
Remember the data is usless unless you have clear track and you are driving hard.
Weekend warriors--like myself mostly--would get better value spending the money on new tires/brakes and apleasing the little woman at home:)--least that is what my wife says?
OD

^ I'll only say this about that regardless of whether you are a newbie or experienced driver/racer.

Seat time wo/feedback only instills your bad habits further into your subconcious, making them harder to unlearn over time, and the inability to even see that they exist.

Seat time w/feedback exposes your failings, your self preservation responses, your fear...your true nature.

Only feedback through study of your own actions leads to a narrowed focus, rejection of unconcious fear, and purposeful action at the conscious level to improve your skills.

Lap times are simply the distillation of all this into a quantifiable approximation you can reflect on but do not equal your skill.

I have been using the Racelogic PerformanceBox for a couple of years now. I find it very helpful. It's worth it's price just for the in-car lap time feature. I can get instant feedback about my last lap time. It's easy to check once a lap while you're accelerating down a straight.

Then, you can compare laps afterwards in the software provided. It's also easily transferred to other cars, so I can give it to fellow racers and then compare my laps to theirs to see where I can improve.

One more thing which makes it even more valuable is that they have recently released new software which is much more powerful than the old software. You can get it here: http://www.performancebox.co.uk/dlsoftware.html

I agree with you 100%. For the last 2 years my only feedback was feel and my ability to look at my speedometer at track out cones. I would record my laps from inside the car and talk to my self for notes. When I would go back and view the video I could split up the track and see where I did something good or bad.

While this method was better then nothing, it left a ton of gaps and room for improvment that even the cheepest gps lap timer will improve.

I have decided to go with the racechrono touchscreen pro with obd2 bundle. The racechrono software is already pretty good and they are the kind of company that is alway improving. The unit itself is basically a small touchscreen computer which will only be limited by the software and hardware you add.

I will have the unit next week, just in time for my next track day. I will post my review and maybe even a track over lay.

I have had the Traqmate for almost as long as Spin....

I like the unit..and the video integration is great. As far as price...it is a bit pricey..but the options for something like it..especially when it came out were almost twice the price

It seems that as technology catches up in the GPS arena that faster stuff is coming down the pipe in this area..

Thanks for the updates on the available stuff you have found

I forgot to mention that the Racechrono TS comes with video integration software. I will post my own video but for now you can check out a samle from the USA distributor. http://www.youtube.com/watch?v=gb6bt...ayer_embedded#!

For those who are interested in an El Cheapo method and have an Android phone, I've successfully used Trackmaster.
http://fs01.androidpit.info/aqr/x64/...2359120506.png

It's $9, the developer is quick to answer questions and is upgrading constantly.

It uses the internal GPS (1Hz) as is, or you can purchase an external BT GPS unit and pay a couple of more dollars for the app to link them if you need up to 10Hz.

It outputs data to Google Earth, .kml, or has its own graph exporter:
http://i54.tinypic.com/2cesqxw.jpg

I integrated the data dump with a small flash-type videocam to get this:
[youtube]QzAm6F_lYLE[/youtube]

Far from as nice as Traqmate or the like, but my total cash outlay over what I already own was $9. It's plenty good for my 2 OTDs / year.

All of the above stuff is good if you're a serious track guy and want some top-notch solutions.

For those of you who want something fun to plot your laps but arnt going to spend much money on it, you want something astoundingly cheap? If you have an Android phone, I bought an app called TrackMaster for EIGHT dollars. It does EVERYTHING including GPS position data, track overlay, calculates speed, G-forces, all of that. The G-meter isn't very accurrate. And it won't give you RPM data. But it does everything else, and the app is VERY well put together. And it's eight fuxing dollars!!!

It even has a (disable-able) function where the lap timer/monitor will only start once you cross the start/finish line. So I click "ready", put it in my pocket, and it only starts data logging once you cross the start/finish on first lap. Genius!

I used it at Lime Rock an havn't gotten around to exporting the data, but the logging itself went amazingly. And it has everything you need to create a sweet video-overlay, like above, minus RPM data.

The only minor complaint is that the GPS reciever on modern cell phones run at 1hz, so the data rate isn't so fast and it uses a lot of interpolation at times. That said, if you REALLY want, it's compatible with external 5hz or 10hz GPS recievers, to provide silky-smooth speed and position data, which can be bought for less than 50 bucks.

EIGHT DOLLARS! heh I think I've made my point...

Now this is my kind of Thread!!!

Having owned an earlier version of Traqmate, AIM and now using Motec for the past 3 seasons, I can share a few things that may be useful to all:

A professional driving coach (or someone who has been there/done that) will ask you to have these things in your data logging system:

-Throttle position sensor (which the RX8 has and can be accessed via OBD port)
-Wheel speeds (not GPS) for each wheel (RX8 has this via OBD)
-Brake pressure sensor (absolutely key to going fast). Need to add pressure sensor for this. We tap our master cylinder pre-ABS module and it does the trick. All you are looking for is a pressure value that tells you what your feet are doing.
-Steering wheel angle sensor (a bit trickier to add but very valuable when you are doing advanced driver analysis). This sensor is not required unless you suck with your hands or are a very fast driver looking for tenths.

In addition to the ability to log these items for driver developement you'll want something to capture lap times. GPS is good except if your under the tunnel on the Long Beach backstraight or its cloudy and raining. A beacon will fix this. Both will give you everything you'll ever need. Obviously lap times are essential.

The things I would log if I was a serious driver looking to go faster are these:

-Lambda (A/F)
-Fuel pressure
-Oil Temp

Oil pressure is nice but it will only tell you when you've already had a problem. Water temp is accesible via the OBD port. So is RPM. Intake temp is there just for fun. It is pretty much useless unless you have done a before and after with intake setups and seen that it is freakin hot under the engine bay and if your intake is using it's air source from inside the car you are a goof ball. Use fresh, cool air sports fans unless tidy looks are more important to your 5.2 megapixal Nikon. Looks are for losers. They have nothing to do with going faster. I digress

What, no style points?

Personally I would invest in the AIM MXL unit due to it's features and expandability. Some of the things people miss out on are what happens when you want to expand your system. I'm telling you that you NEED to be logging A/F and fuel pressure or as you and your car begin to go faster a new set of data will become more important to log/record. Losing fuel pressure due to fuel swishing around in your tank can starve your motor. Starving a rotary of fuel at high rpm load = boom. Boom. Having the ability to review and confirm this data to diagnose engine problems is KEY to trouble shooting. Key. Driving fast doesn't mean squat if you just blew your motor or are getting inconsistant fuel pressures which may lead to future engine boom booms or power loss. Plan ahead by asking those who have been there what you'll be needing to log.

Now that you have your data acquisition you'll need to start using it. One thing you WILL need is somebody experienced to help you understand how to go faster. Throttle, wheel speed and brake are required for this. REQUIRED.

Another thing I'd do in a heartbeat is put a faster driver in your car. It takes a big ballsack to put yourself in a position to see that your best friend can drive your car faster than you. But this is what a man does. Yep, I said man. Seen it all the time---nobody wants to find out they suck. Ego issues. Ask a pro driver at your local track to drive your car. A smart driver will throughly check out your car before they do this. A smart driver won't get in a car unless they now what kind of maintenance is behind it. I still do this. Did it two weeks ago. Find somebody faster than you and ask them to put down a couple fast, safe, zingers. Obviously you have been taking tire temps and pressures religously to ensure the car is working properly.

Love you man.

The Speedsource Renesis cars were powered by a Motec and used an early version of the Motec sport dash/display. This game them access to the road race industry standard I2Pro Motec analysis software. The majority of Grand-Am Rolex and World Challenge GT and GTS (older Touring Cars) run a Motec and use i2Pro software. Expensive but worth it: http://www.motec.com.au/i2/i2overview/

For data acquisiton we use both the SDL display and the ADL2. Just an idea of how you plan in this realm: A SDL display will run you about $3,500'ish without sensors or wiring harness. An ADL2 runs about $6,500+ with no sensors or wiring harness (which is all custom and expensive). Typical data acq harness with Deutch connectors run $2K plus. That's about 10K when you put all the materials and labor into the equation.

Here is what we are currently logging:

-Oil T and Pressure
-Oil P
-Crankcase P
-Air Intake B
-Baro
-All wheel speeds
-Brake P
-Steering wheel angle
-Shock travel/suspenion travel with P&G Potentiometers
-Fuel P
-Throttle (Stock FlyByWire throttle body swapped with manual)
-Manifold P
-EGT (2)
-Diff T (hotter exhaust will overheat your diff. At Toronto our diff cooler failed and we saw 400F diff fluid temps.
-RPM
-Lat, Long and V g's
-Infrared temp sensor we move around to measure things (currently brake rotor, caliper and hub temps because next year our World Challenge series is using a Pirelli slick). A more grippy tire will reveal new issues in a car. Currently we are using a similar 1.5 lat g tire to find/discover/uncover heat related issues to prevent mechanicals that may come from this new tire. For the record, we do replace our front stock hubs, brake calipers, master cyl and brake booster prior to the beginning of every season just for insurance purposes. We replace the front hubs and brake calipers mid-season to avoid any issues (which do come from time to time because we are beating the crap our of the tires).

Some side notes:

-This is new ground for a beginner and this stuff is hard to learn. Few resources exist for this. One of the easier things to do is go find a higher end, serious racer and hang out with them at the track. IT DOES NOT HAVE TO BE AN RX-8 sports fans. Find somebody doing it right and ask to look look at their car. Spend time looking and not asking questions. Look, look, look and you can understand what they are logging.

-An easy and free thing to do is obtain free data acq software and have someone send you their log files. You can start looking and observing what they log. Typically a professional racer or race team engineer has zero time at the track. Zero. If you can get them off track and buy them dinner with their lap top you'll have a better shot and learning things.

-Mechanical engineers pick this stuff up waaaay faster than sales guys. Me (sales guy) has figured out how to do it after years of practice. I'm pretty good too. Hats off to all the guys better than I that I've tapped into over the years.

-The last thing I would think about is hiring a pro driver to help you with data acq. There are many guys that do this. Some are much better than others. Some are dicks. Some are very humble and have your best interest in mind other than your pocket book. Plan to spend about $1K per weekend plus expenses. WELL WORTH IT. Bring your mechanical engineer buddy with you and plan to buy him dinner and beers next season and he will hlep you to go faster.

If you want a Motec log file from a track to look at, just ask me. All I ask it that you have Motec i2Pro and can prove to me that you have it and I'll send a file. Please, no requests for data unless you share your intent for using it.

Cheerio

E

See more about fun to be had with an expandable system like the Traqmate here....

https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/shocks-coilovers-general-suspenion-knowledge-links-207346/

Attachment 251498

(I know scale is off the charts to big, and reading are low- I hadn't correctly calibrated them yet - and was just starting w/the temps graphing)

You get what you paid for in these datalog system. A more expensive system will give you more information, but you have to actually understand what it is giving you.

This is what I use. It matches the AMB within a few 1/100's of a second.

Exactly- and since I have an accessport, which can log RPMS, you could combine that data with data from TrackMaster in a spreadsheet and have all the basics for SIMPLE logs or videos.

Again this is the cheap and simple method....and won't be as useful for serious race driving practice as the fancy stuff Eric and others were talking about.

But again- EIGHT DOLLARS. :ylsuper:

Some of the phone aps like Racechrono allow you to use an external gps and odb2 readers and then overlay everything onto video.

My carpc solution is quite nice, the best thing is that I havent locked myself with an deadend software/hardware. it can be changed with only a different software.

Dashcommand is great, logs every single possible PID there is in the RX-8 PCM. it is also possible to hook up AUX for example AIM, Motec, Etc etc and of course it supports other sensors.

You can log how mutch data you want, currently I run a 250GB disk and there is no problem to log a whole season if you want.... =)

Hook Dashcommand and Racechrono up and you have a nice solution with digital gauges that can be changed to what ever you want.

like Eric said--hire a pro--or go with a run group like NASA, get a good instructor that races--if you feel good with him--let him drive your car and you take the right seat. Its easier for me to learn when someone shows me--rather than trying to figure out data and putting that data to use.
Eric is the rare bird that works on his own, fabricates himself and drives. Sometimes I think he enjoys the figuring out part more than anything.
OD

Yepp thats an good idea =)

http://vimeo.com/14710996 <--First out me, next heat is Instructor (Also Miata Cup driver) Henrik Phil testing my car.
http://vimeo.com/14713740 <--Instructor (also driver in Endurance Racing Cup) Matz Olli tests my car.

Fun to compare driving styles during and after (loggs and videos) =)

I try to catch all possible good drivers at events and let them test the car (with both the camera and logging turned on).

Next season I will have atleast one camera on the outside and one 1080p camera inside the car.

nice---exhaust sounds different?
here is one of mine at Road Atlanta this year--just messing around.
you can see the tach if you look hard
notice the close ration between 4 and 5th gear.
i get to 6th on the long straight at 125mph
http://contour.com/node/110235

I'll take a look to night =)

What you hear is actually only the intake sound, its an Gopro fitted right where my Racing Beat intake duct sucks in the air. you can hear the SDIAS working well ;-)

EDIT: Nice driving, that wasen't your first time at Road Atlanta I guess, it looks smooth and fast. Damn nice track btw, don't know how many thousands of laps I done at it in Forza Motorsport. I got the feeling being in the backset of your rx-8 there just wanted to ask you for a couple of laps ;-)

ha ha--anytime you are in the area:)
The long right handed downhill turn after you go under the over pass--is a negative camber turn--you cant tell it in the vid.
Its a baller of a turn. No run off either. I am about 100mph there. woo ha.

So that is that sound----i be dang. Thats a setup i have never seen before and it sure sounds good--now that i know what it is.
Keep up the good work dude and rotor on.
OD

http://www.youtube.com/watch?v=DBfS_...&feature=share

A video from my latest track day. I use a basic handheld camcorder and the Racechrono pro lap timer (10HZ external gps). The obd2 reader bundle was ordered but had not arrived on time so no RPM or TPS.

At the track the RC timer was very easy and helpful to use.

The data overlay was pretty easy once I figured out the included software and found video editing software that would do the overlay. I used cyberlink power director (trial version). I may purchase the program for about $60 or use a free version of track vision.