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I went ahead and ordered the BHR resonator to replace my buzzing/failed Moroso unit. I still haven't installed the TXS header but will do so at the same time as I replace the resonator. after that i'll be doing a dyno run with AFR
I have a Hypertech programmer that just has a blanket mystery tune. I know very little of tuning and I want to learn so Im going to investigate some, but I think I can be sure this hypertech isn't going to get it done.
I'm looking forward to the results!
One thing that's been mentioned is that fuel pressure might seem fine at start-up or light driving, but highway cruising or racing can cause the pump to heat up and start to weaken. Not sure when you measured your pressure. Guess the wideband O2 will give similar data.
One thing that's been mentioned is that fuel pressure might seem fine at start-up or light driving, but highway cruising or racing can cause the pump to heat up and start to weaken. Not sure when you measured your pressure. Guess the wideband O2 will give similar data.
Yep Im hoping to see some good numbers, Ive also got an erratic idle too, so its a few things that need to get looked into.
I removed the hood installed a fuel pressure gauge to the line and taped it to the windshield so I could see it, and also recorded results with a gopro on the dash. I drove the car pretty hard made sure to do some extended sweepers and rode all the way out to redline multiple times, did sustained max-g sweeper at redline in 2nd for an entire circle so a solid 10 seconds and no pressure drop anywhere.
Originally Posted by Enginerd
Why no Accessport? Less expensive I assume?
I picked up the hypertech for $100, it seemed to make a butt dyno difference, particularly from 5000 to 7500, but then I started having the resonator failure and it's sort of muddying up my results. Id like to get the Cobb but they seem to be rare beasts and the price is still a bit steep for the device and everything involved with the tune optimization. I'm considering just getting tuned by a shop with a commercial mazdaedit license and some dyno time, which I know adds up fast but it would be custom and verifiable.
Originally Posted by Enginerd
Ran the local autocross in Clemson, SC this past weekend. It's not on par with an scca event but still good for testing and practice. 2nd and 5th overall wasn't too shabby for it's first time out. 1st was an STX Toyobaru of course...
Heh, Im expecting to get trounced around a bit by the twins this year, Im going to see how the season plays out but if im topping the class locally against Cathers and Jones then I'll be confident I can trophy at Nats, but if not Im going to try to swing a twin codrive, I have a few options.
Originally Posted by Enginerd
Think anyone will call foul if I install a Sohn adapter kit? I don't know how long I'll run in STX or how competitive I'll be but I'm just trying to make this 10k mile engine last.
It's not a performance enhancer its a reliability mod. I don't know the wording of the rules but that would be a weenie protest for sure.
I'm doubtful that it would be legal in ST* or even *SP. It completely changes the way our apex seals are lubricated, and while there's no performance benefit, I see no specific allowance for this in the rule book.
Originally Posted by TeamRX8
No, the Sohn adaptor absolutely is not an allowed engine modification in the ST ruleset
These seem to answer the question, although I think if anyone is douche enough to protest something like that that is clearly for reliability then the whole solo community should get some bars of soap and give them a sock party.
Heres something im genuinely interested in and I don't see anything explicitly allowing it or disallowing it: WPC treatment for engine components, anyone tried it?
The SCCA rules specifically permit any type of ignition coils (so D585's are legal), as long as the bracket attaches to the oem mounting location. This includes CS.
Fuel pumps are not mentioned until Street Mod, so they are not permitted in STX.
I'll laugh if somebody goes after my SOHN adapter in a protest, assuming they know what it is in the first place.
AFAIK Team moved on to DSP so I guess he's spending more time in that thread.
I'm considering just getting tuned by a shop with a commercial mazdaedit license and some dyno time, which I know adds up fast but it would be custom and verifiable.
If my car hadn't come with a Cobb I would definitely be looking into mazdaedit.
It seems like he went into the car with a lot of preconceptions, seemed like a canned review. I was annoyed that he used the cliché "forgiving" when he hadn't even done anything that needed forgiveness! Anytime I hear/read the words "progressive" "breakaway", and "forgiving" in a review its an instant ::eyeroll::
Maybe I'm being harsh, Matt Farah I love what you're doing keep it up I'm just being a nitpickey douchebag.
Oh and I haven't done any of the things I was going to do yet with the RX8 haha. Short list includes:
-Header and new O2 sensor install and subsequent dyno tuning
-Motor mount
-both front wheel bearings (passenger side bearing has developed lots of play)
I'll be sure to post dyno results, before/after etc.
I was annoyed that he used the cliché "forgiving" when he hadn't even done anything that needed forgiveness! Anytime I hear/read the words "progressive" "breakaway", and "forgiving" in a review its an instant ::eyeroll::
It's probably his way of saying the car is balanced lol. I thought overall it was positive and he hit on a few of the main reasons I chose the 8 over other options. Or at least his negatives weren't a problem for me (mpg)
Legit dyno plots and tuning saga to follow, but the Virtual Dyno results look promising. This is with the new upstream O2 sensor and TurboXS header installed. Also the Moroso resonator i have has stopped buzzing and I still have this BHR one in the box. I guess I'll swap them whenever the problem returns.
I was chasing pressures most of the day. I went as low as 27 psi, but seems like I could've still gone lower, as there was a solid .5" or so still chalked up.
Dixie National Tour is coming up this weekend and I'll be the only RX8 taking on the onslaught of twins and a few remaining BMW's. I haven't done a whole lot to the car since last season other than installing the Racing Beat Header and adjusting the alignment on the car last weekend. Current settings are...
Front Camber -2.7
Caster 6 deg
Front Toe 0
Rear Camber -2.2
Rear Toe +.25 deg
Forecast is calling for lots of rain on Friday / Saturday so I have a new set of Bridgestone's ready to go for wet's...planning to test out the new alignment on Friday rain or shine with more negative rear camber (-2.5) as my tuning adjustment should the rear be too unstable.
Forecast is calling for lots of rain on Friday / Saturday so I have a new set of Bridgestone's ready to go for wet's...planning to test out the new alignment on Friday rain or shine with more negative rear camber (-2.5) as my tuning adjustment should the rear be too unstable.
I ran locally in rain last weekend and I was amazed how planted my 8 felt. It was my first time out on Ohlin DFV, my alignment is very close to yours and I was on my DD all season tires on OEM rims, so lots of compermise there. I remembered reading somewhere that disconnecting the rear sway is the way to go so I did that and just went for it.
I ran in the fourth and last group and the rain was nonexistant or barely there right up to about ten min before my run group started. Overall I managed 17/42 PAX and 18/42 RAW. It was a small group due to the weather and the results are not amazing, but I did manage the low time for STX and overall I had the low time for my run group by 1.5 sec. I am by no means an expert behind the wheel and I am still on the steep part of the learning curve so that tells me that the Ohlins are pretty damn good and disconnecting the sway bar definately helped.
Go get 'em this weekend!
Last edited by Solidtrance; 03-18-2016 at 10:36 AM.
On rain, I've done two days on track in wet to very wet conditions recently and found it really hard to get the power down, or even keep the rear in line with neutral throttle.
As it was drying up at my last event I decided to try with the rear sway bar disconnected. All of a sudden the car was my friend again. So much better... once it dried more then understeer set in so I reconnected it and all was good. So, it seems the balance shifts from understeer to oversteer as you remove grip, and back to understeer as you add it again...
I'll be starting out with the rear bar disconnected next time it is wet, and then reconnect if I have too much understeer. btw, I have a sport without TC, and fatcat coilvers/track alignment that just has a touch of understeer in the dry.
One of these was slightly uphill and the other slightly downhill in the opposite direction.
Cobb Accessport base tune only, right around 190 with the 'DynoJet' correction factor applied:
One of these was slightly uphill and the other slightly downhill in the opposite direction.
Cobb Accessport base tune only, right around 190 with the 'DynoJet' correction factor applied:
Are you using the Cobb Stage 1 tune? If so, be careful with that. My car ran ridiculously lean on that tune. Here's a log of a 2nd gear WOT pull:
You can see the stock and stage 1 commanded AFR's versus the actual measured AFR's. The two curves at the bottom are the deviation between the actual and the commanded. For whatever reason, at about 5500 rpm, the stock map would go really rich but the stage 1 map would go super lean.
My AFR's are actually plotted on this one and seemed to stay in the 12's above 4k and dipping in the 11's at 7500 and above 8500. I have a new OEM upstream O2 sensor and inspected all the wiring and everything so im not worried about erroneous signals or anything, it seems to be working right. Hopefully the gremlins stay out of it.
One of these was slightly uphill and the other slightly downhill in the opposite direction.
Cobb Accessport base tune only, right around 190 with the 'DynoJet' correction factor applied:
This is pretty cool software I just loaded a bunch of similar pulls (same car on the same road, all 3rd gear) and it looks pretty consistent.
I do have a question, how did you get AFR to show up? I am also using my AP and loading as a csv but for some reason AFR is not showing up even though it is in the log data.
No rain last weekend at Dixie but still drive pretty well overall finishing 6th/26 in STX and 36/281 in combined PAX. For my first event of the year I was pretty happy with how the car handled...felt like the biggest area I was losing vs the fastest FRS/BRZ's were the larger lateral offsets as the extra weight of the RX8 plus softer set-up on the KWv3's resulted in some decent body roll and delay. I felt like some time was left out there on Day 2 that could have moved me up to 5th, but didn't really have anything for the Top 4.
My AFR's are actually plotted on this one and seemed to stay in the 12's above 4k and dipping in the 11's at 7500 and above 8500. I have a new OEM upstream O2 sensor and inspected all the wiring and everything so im not worried about erroneous signals or anything, it seems to be working right. Hopefully the gremlins stay out of it.
Haha, I guess I should have paid more attention to your chart. It's interesting that yours has the same sort of step function to a rich mixture as my stock tune, but does it ~1500 RPM sooner. Other than that, it looks like it's running at the same AFR so I wonder if it's actually making any more power than stock. It's also just generally weird that yours and mine would behave so differently with what is ostensibly the same tune. My '05 is a CA car, so maybe that's different?
Also, have you done any MAF scaling? Looking back at my logged data from when I was in STX, there must have been something really goofy with my MAF scale (or injector scale maybe?) because the actual AFR was never very close to the commanded AFR in open loop. With the turbo on it now, I spent a lot of time dialing that in, and it's pretty much dead on all the time.
Last edited by Kennetht638; 03-28-2016 at 03:29 PM.
Haha, I guess I should have paid more attention to your chart. It's interesting that yours has the same sort of step function to a rich mixture as my stock tune, but does it ~1500 RPM sooner. Other than that, it looks like it's running at the same AFR so I wonder if it's actually making any more power than stock. It's also just generally weird that yours and mine would behave so differently with what is ostensibly the same tune. My '05 is a CA car, so maybe that's different?
I just figured that was where it transitioned from closed to open and figured it was some kind of setpoint. But I don't really know much about it, or really even know where it would be documented. Maybe the tune is just generally a little more aggressive to account for 93 octane, but yeah I imagine the behavior will be very stock like. I'll get my first Custom Tunes from mazdamaniac this Thursday.
Originally Posted by Kennetht638
Also, have you done any MAF scaling? Looking back at my logged data from when I was in STX, there must have been something really goofy with my MAF scale (or injector scale maybe?) because the actual AFR was never very close to the actual AFR in open loop. With the turbo on it now, I spent a lot of time dialing that in, and it's pretty much dead on all the time.
I haven't scaled anything, but the O2 sensor is new and I understand that's helpful for signal accuracy. I never messed with any scaking or anything Ive yet to learn much about it.
Last edited by Nathan Atkins; 03-28-2016 at 03:29 PM.
I just figured that was where it transitioned from closed to open and figured it was some kind of setpoint.
Stock closed loop exit RPM is 4000 but the Cobb Stage 1's CL Exit RPM is 6000. Either way, it shouldn't matter because under 4000, it should be open loop if you give it more than 60% throttle. I've found that not all of the tables in AccessTuner Race do the things they're supposed to do though.
02-04-2016, 05:01 AM
