Digisan, Most N/A cars run a leaner mixture than turboed cars. On a baileys wideband we see or tune tune 12.0.1 on turboed cars and on n/a cars we see or tune to 13.5.1. Also these are target values it can very from tuner to tuner.

 

Did you check the link I posted for you? 13.5 is not what the RX-8 runs stock, if that was the case it would be putting down over 200rwhp, and it's not. I agree with your statement, but it just doesn't apply to the the RX-8. The fuel mixture is very rich so the cat can last 120K mi.

 

Sorry but **** your link. I sent you a p.m. I dont gossip just the truth. Anyhow please post my link if you want.

 

Don't get mad at me because you can't use a wideband. You are the ONLY ONE that has measured the RX-8 at 13.5 A/F stock.



heffner PM quote:



"Digisan, you read too much on this forum. I logged the AFR's myself I know what it runs. Not to be a DICK but that is what I logged with a real AFR meter unlike most people on the homo nets. But live in your world of unrealistic dreams and dillusions of grandure. If it was to save the cat it would run lean! A rich cat will fail very quicly. Do research before you blab internet bable from theses guys. From the source!"



It is widely known why Mazda re-flashed the ECUs, simply to bring down the exhuast temps by richening the mixture so the cat will last 120,000 miles. Just because a car is running rich (I'm breaking new ground with this statement; typically cars run rich) doesn't mean the cat will fail prematurely, cat operating temps need to be kept in check. Of course, dumping fuel into the cat will cause it fail prematurely.





"This in part plays into the “lost power” issue with the RX-8. Mazda’s engineers have programmed the car to run “rich” at higher RPM’s in order to keep the exhaust gas temperatures down. Running a leaner mixture at these higher RPM’s may overheat and prematurely damage the cat, risking that dreaded word to every car maker….. recall!



We are certainly working on the exhaust, but the man-in-charge is currently in Japan and I must wait a couple more days for an update. My guess is that we are still several weeks away, sorry.



Jim Langer

Racing Beat"





heffner PM quote: "Do research before you blab internet bable from theses guys."



I suppose Jim at Racing Beat is internet bable as well? I smell a troll.

 

Gotta go with the Digisan on that one, "pig rich" above 7500 rpm.



A simple fuel controller with a well designed 3D map will lean it out, and free up another 20+ hp.



I personally drove around with a passenger seat full of broadband, EGT, and laptop, to develop the maps. My buddy 'Canzoomer' can hook you up.....

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doc

 

If FEs are like FDs then they will run richer for the first 20,000 miles to ensure a safer break in. I could not find the link but it is in the FD factory service manual. Something changes once the car flips over 20K miles then the car runs less rich it sounds like bullshit but for real find an FD FSM or ask a 3rd gen guru about it. But, anyway we should see an improvement in the 8's fuel economy after 20K miles...

 

Unfortunately, the fuel maps were changed to comply with the new emissions standards, not for engine break-in.

 

I was getting 13mpg. That was brand new, not broken in, idling alot in the cold. I would let it idle for a while, I didn't want to get in a cold cold car. Anyway, 1400 miles on her now, getting like 18mpg. All city. Not bad.