i going thursday night to run some qtr mile runs . they sell 110 octane &114 at the track but it is expensive .do you think this will help very much for the $.i'm planning on making several runs
1st run i will shift at 6000rpm's
2nd '' ''' '' 7000rpm's
3rd '' ''' '' 8000rpm's
4th '' '' ' ' redline
i want to see how the car reacts to different rpm's and see if it is pumping too much fuel for the car after 8000. someone posted earlier that shifting at or after8000 rpm's you lose speed in the 1/4 mile .i will post results friday morning.

Go to the tech section/do a search. I don't think that high of an octane is good for the car.

High octane isn't bad, but odds are the 110 and 114 is leaded gas so I don't suggest using it.

Go to the tech section/do a search. I don't think that high of an octane is good for the car.

Really? I thought highest octane was always best? And after a certain level, it didnt matter cause there wasnt going to be any predetonation for sure... :confused:

Your not going to get a 14 anything at those shift points if that was your intent. To get the best time its MHO you have to shift at 9000rpms and be so quick about it, so quick that you might bounce off the tach because you got back on the gas too quickly.

Moving to Comp Racing.

I think he meant in different runs he was going to try starting from different RPMs, not shifting at those speeds in each gear.

I think.

ooooooo i thought he ment 1st 2nd 3rd and 4th gear and i was beating my head at him in that case, Make sure your spin the wheels before your drop!.

i find i got the best time reving to where the torque peaked and the sliped the clutch. just my 2 cents though


Oh and beware the super wheel hope if you got the stock suspension. LOL

I second the alert on the rear axle hop. Its a real pronounced bunner. Keep us posted as I am really curious s to your results. You may even want to have a freind film you and share it on this forum (if that's possible!)

C&L makes unleaded 116 octane fuel..try that...they sell them at some 76 gas stations...

please show some results, really interested

I have experimented with this theory about shift points with the 8, I have found out that 6000 RPMs is a better shift point. search some of the CZ unit threads and you will find AFR maps after 6000 it gets really messy and robs you of power which explained why I got better times shifting at 6000 rpms rather than 9000, that puzzled me for the longest time. Also tonight I'm going to my local 1/8th of a mile and I'm going to use my canscan tool from Auto Enginuity to log all the data. I'll try to post the graphs and data tonight or tomorrow.

what you get for a 1/4 mile shifting at 6000 rpm horse ?

we to the strip last night here are my times.temp was 64 this was my first time on a track so dont laugh too hard.
1st 2nd 3rd

rection1.398 .720 .966
60ft 2.248 2.415 2.361
1/8et 9.894 10.184 9.964
1/8mph71.77 70.64 71.54
1/4et 16.031 15.685 15.684
1/4mph62.92 85.35 ?

the first run was with dsc/tcs was ingaged droped the clutch at 4000rpm's shifted at 7000rpm's missed 3rd gear wheel hop was not that bad.
2nd run dsc was off dropped the clutch at 4000 wheel hop was so bad i had to let off the gas .then shifted at 9000 just to make up the the wheel hopping.
3rd run dsc off featheered out the clutch at 4000 wheel hop was not bad until i hit 2nd gear shifted at 8000 this felt like my strongest run besause i was in control the whole time and the car just ran good.mine is stock and with it being stock i don't think i can get into the 14's .

hmmz not bad , you only had 1 run ? .... you needa launch better ... seems like you were bogging or wheel hopping from your 60 time

IN 1st &2nd gear this car with dcs disappled it wheel hops so bad you have to let off the gas or it will shake your teeth out .i know my reation time sucks but it was my first time on a track .if you dump the clutch you are screwed you have to feather it out or your dead.it doesnot stop wheel hopping until you get into 3rd gear.

This wheel hop issue really drives me nuts. There has to be a better way of solving it without ruining your clutch on launch or having to replace the suspension and stabalizer bars.

This wheel hop issue really drives me nuts. There has to be a better way of solving it without ruining your clutch on launch or having to replace the suspension and stabalizer bars.
Maybe tires could help a bit. Although, the mere thought of stickier tires gives me the creeps and makes me think of broken trannies and diff's.

Pettit has something they mentioned to tone down the wheel hop, I forget what it is but it was on their site. My best 1/8th of a mile is 10.3, and that was my first time ever, shifted at 6000.

After installing the coilovers (more damping and spring rate) my wheel hop is gone. When KYB, Koni or Tokikco (SP?) come out with adjustable shocks for the rear they might be useful in killing your wheel hop.

I have experimented with this theory about shift points with the 8, I have found out that 6000 RPMs is a better shift point. search some of the CZ unit threads and you will find AFR maps after 6000 it gets really messy and robs you of power which explained why I got better times shifting at 6000 rpms rather than 9000, that puzzled me for the longest time. Also tonight I'm going to my local 1/8th of a mile and I'm going to use my canscan tool from Auto Enginuity to log all the data. I'll try to post the graphs and data tonight or tomorrow.
Ok granted the AFR richens a bit after 6000rpms but to shift at 6000rpms is just plain wrong, think about it. The max WHP you have at 6000rpms is around 150WHP give or take, opposed to the 180-190WHP you have at 9000rpms.

No matter how power efficent your AFR is (close to 13.5-7 in the 8) at 6000rpms its not going to rob you of 30-40whp.......... i just don't know what else to say.

well, I'm just saying what the timeslips told me.

Your timeslips are wrong. A 1/4 mile race is all about horsepower. You make more horsepower at 9000 rpms than you do at 6000 rpms. Telling people to shift at 6000 rpms will only lead to people running 16-17 second 1/4 mile times. You might as well tell them to start in 2nd gear while you're at it. :-)

You might as well tell them to start in 2nd gear while you're at it. :-)
Hey! that's my technique for Texas Winter Driving.... :p

Horse, you don't know what you're doing. Your numbers have proven that.

Sorry.

Horse, you don't know what you're doing. Your numbers have proven that.

Sorry.
Lets be nice about it if you wanna say that at least elborate on what i said.

Let's not forget that shifting or otherwise keeping the engine around 6K is to deny the engine the benefit of the third pair of ports opening up. Polak is correct about the h.p. being only 150 +/- at 6K or so. That's a mathematical equation that cannot be disregarded. In stock form the Renesis is said to reach it's h.p. peak around 7,200. With my handful of mods my peak is somewhere near 8,900. I have found, as someone else pointed out, that the best launch is at the torque peak(4,500 or so). I have also found that the best shift point is 9K stock and at the fuel cut(9,750) with my mods. The only way to avoid wheelhop takes a little bit of money.

Charles

I am not argueeingw ith anybody I'm not stupid I know that you should run hte gear to the redline to achieve max power. I'm just saying that I went to the track, and it's an 1/8th of a mile, and when I shifted between 6000 and 7000 I got a 10.3 which was my best time over all. I just thaught that it seemed to correspond with the data we have pulled of the ecu with our stock fuel maps, soom have said that after 6000 we are being robbed of Horsepower. I wasn't advising anyone to do this all I said is a I also experimented with shift points and I got this data, perhaps there is more to it. I will post my can scan data with all the variables that took place during my next runs, but at this time I still have to send the unit in for the CAN update. Here is the graph that I spoke of

horse i meet you in raliegh last week at the meeting an you seem to know your stuff about the rotary enigine pretty weel .but i have to disagree with you on this one .if you check my times at the begiining of this post all of my 1/8 mile times beat yours .the only one that was close to yours is when i had wheel hopping really bad and had to let off the gas .i ran 9.894with thd dsc on and my bestime was a 9.595.my fastes mph in the 1/8 was 78.11 .i will bring my slips with me to the next meet which i think it is nov 13th .

I said I am not argueeing, I'm glads your times are better, before you posted your times I just posted what I experienced. You proved me wrong with your vehicle but someone come strip mine down because something's wrong because this is what I got, I'm not doing anything wrong, no lie, so know after saying that I am not telling people this is the way to do it and it is wierd and your numbers prove me wrong, I tired of being told I am wrong because I'm not, maybe the slips are I'll go to a different track but by posting the info I was given by the machine and just saying this is what I recieved, I am right in my case because I posted what I recieved. I didn't say run out to your local quarter and shift at 6 grand did I? SO I'LL SAY IT AGAIN YOUR RIGHT, YOUR MEHTODS ARE CORRECT, THIS IS WHAT MY EXPERIMENTS SHOWED, AND I DON'T SUGGEST SHIFTING A 6000 RPMS IN A RACING SITUATION.

I am not argueeingw ith anybody I'm not stupid I know that you should run hte gear to the redline to achieve max power. I'm just saying that I went to the track, and it's an 1/8th of a mile, and when I shifted between 6000 and 7000 I got a 10.3 which was my best time over all. I just thaught that it seemed to correspond with the data we have pulled of the ecu with our stock fuel maps, soom have said that after 6000 we are being robbed of Horsepower. I wasn't advising anyone to do this all I said is a I also experimented with shift points and I got this data, perhaps there is more to it. I will post my can scan data with all the variables that took place during my next runs, but at this time I still have to send the unit in for the CAN update. Here is the graph that I spoke of
Why does the graph show you only being at 70-80% throttle?

Not nearly as knowledgeable as many on this site, but it sounds like you don't have the M flash. Also I heard the K&N actually robs you of power and screws up the ECU programming/actions. Probably that is why so many people are selling their K&N intakes.

Furthermore, I also heard that the Canzoomer was best for previous flashes before M.

ok, so here are a few questions, to get the best time you
-take dsc off
-drop the clutch at 7500
-and change gears in 9000

right, please help, im doing a run tomorrow and want to impress

If you really want to impress, hold RPM @ 8,000 -8,500 and drop. You have the rest right. Short of 8K RPM, you improve your chances of more serious wheel hop.

it's jason's graph not mine, I do have m-flash.

ok, so here are a few questions, to get the best time you
-take dsc off
-drop the clutch at 7500
-and change gears in 9000
right, please help, im doing a run tomorrow and want to impressif you drop the clutch at that high of rpm's the wheel hopping will be to bad .your time will be slower .try 5000 and feathering out the clutch .try 2 runs your way and my way and post times.

im in las vegas and i had ran my rx8 in 80 degree weather

came up with a 14.53 second @ 99.63mph, my 60' was quite impressive with 1.9, i too had wheelhop all through 1st and shifting into second, i launched at 5.5k thats where i got the least wheelhop anything higher just made my tires spin and catch no traction, i seem to have more trouble launching on the street then on the track

im in las vegas and i had ran my rx8 in 80 degree weather

came up with a 14.53 second @ 99.63mph, my 60' was quite impressive with 1.9, i too had wheelhop all through 1st and shifting into second, i launched at 5.5k thats where i got the least wheelhop anything higher just made my tires spin and catch no traction, i seem to have more trouble launching on the street then on the track


I'd love to see how 'wheel hop all through 1st gear' allows for a 1.9 60 footer... that seems odd.

It's total BS man, look at his trap speed, there is no way in hell a stock RX-8 is trapping 99mph.

It's total BS man, look at his trap speed, there is no way in hell a stock RX-8 is trapping 99mph.
Probably right i say post the slip.

I often wunder how accurate our speed-o really is, the reason I say this is because I now for a fact when I passed threw the traps at the end of my 1/4mile pass the speed-o "said" 100mph but my time slip said 93mph WTF is Mazda just playing with my mind!!! :mad: :confused: :mad:

I often wunder how accurate our speed-o really is, the reason I say this is because I now for a fact when I passed threw the traps at the end of my 1/4mile pass the speed-o "said" 100mph but my time slip said 93mph WTF is Mazda just playing with my mind!!! :mad: :confused: :mad:


Your trap speed is your average time thru the 'trap' area of the 1/4 mile course. It's an average speed, not the 'final' speed.

I've actually checked the speedometer against my seperate GPS system and it is off upto 2 mph by 90 mph. The GPS provides an update of speed and height every second. So the speedo shows going 2 mph faster. This was a while ago so don't quote me on the exact number it was off by, but it was not much for sure. Remember, that was based on cruising at certain speed as opposed to quick acceleration, where the speed may act a bit differently.

Your trap speed is your average time thru the 'trap' area of the 1/4 mile course. It's an average speed, not the 'final' speed.

That's not true, it's your speed at the end of the 1/4 mile when you pass through the traps.

That's not true, it's your speed at the end of the 1/4 mile when you pass through the traps.


Right - it's average speed thru the traps...thus, your speedo will show the fastest speed reached. That will be different. You are going slower when you ENTER the traps, than you are when you EXIT the traps.

Right - it's average speed thru the traps...thus, your speedo will show the fastest speed reached. That will be different. You are going slower when you ENTER the traps, than you are when you EXIT the traps.

I see what you're saying, but the difference in MPH would probably not even be 1mph.