yeah, taking it to the shop today. jus want to make sure...it doesn't take a week for the computer to "learn" right? i mean my car is stock w/ the reflash.

 

No a week no....maybe a day or two. But no way you should ever be too lean. Too rich..sure...too lean...no way..

 

well, car is in the shop right now...hoping for the best. this reminds me of my sr'd 240. damn car was on down time way longer than i ever got to drive it. hope this isn't the same episode.

wish there were authorized TN installers or mechanics here in HI. woulda gone straight to them if anything.

 

Alberto check this out..

Is that the other guy you were talking about? Looks like he had a bad MAF..

 

i'm sorry...noob question. tried doing a search...can't really find any specifics..but the higher the AFR number, the richer or leaner? i jus wanna know what i'm looking at.

 

Lean.... ... parts of air : parts of fuel...

 

lean = higher number
Under boost you want to be RICH to avoid detonation - WOT should be under 12. Low 11 would be nice under WOT.
At idle you should be at stoich =14.7 ideally.

 

so 21 at idle is bad then? maybe they hooked up my gauge wrong. i have a zeitronix unit. hmmm....gotta double check w/ them.

 

Something is not right with that install. You are running 8 points to lean at idle and 7 points to lean under boost...

 

sounds like the readings are off...but I wouldnt worry too much about the value at idle. At WOT it matters.

 

Sounds like your wideband is screwed up. Combustion won't even happen above 19:1. The wideband gets my vote.

 

I forgot to ask you on g35driver. What AFR gauge do you have? Is it a wideband? That could make a big difference in the numbers you get. If it's not a wideband it's not going to be as accurate.

I also have an exhaust leak (got that t-clamp Reggie?). My AFRs are perfect. 14-15 at idle and below 10.5-11.5 under boost. I also have an aftermarket exhaust and plenum.

 

okay, they found the problem, it was the coupling on the exhaust side of the turbo. now i'm reading 10-9 under boost maxin' 9 lbs, at idle, 15-16 though. dips into 17-21 at times...or should i say kinda alot. okay, when i boost and i let off the gas, afrs go straight to 21...then when i get on the gas it shoots back up to 13-12. i dunno. i guess i still gotta get it tuned. but so far...i'm lovin' the boost quick question. is the exhaust pipe slip fit? if i were to scrap (say if my car was slammed in the front) it going over a bump, would it eventually slide off?

meatshackle...i have a zeitronix wideband. seems to be working okay now.

thanks goes to everyone who replied and helped a brotha out. the regret bug has fallen off of my shoulder.

 

Take it to the dyno before you waste cash on anything else...

 

Like mentioned sounds like maybe an exhaust leak affecting your wideband reading. At idle I will bounce around a bit anywhere between 14 and 16. How is the idle on all the cars? Maybe rasing it a bit might help with the idle AFR's to around 750-800

 

Glad it's working properly. The reason that it goes so lean after you let off the throttle is because the engine cuts the injector duty cycle to 0. Try this: get into 4th gear at around 3k rpms and get into boost then let off, it will go lean then slowly ease into the throttle again and it will get back to around 14.7. That's how it should work. But reguardless, get it onto a dyno to make sure the power output and A/F are ok and your wideband is working properly.

 

alright...will do. wish i had a utec ot emanage U to tune it while its on dyno time. oh well.
ohyeah, i'm starting to see 14.7:1 more often now...yay. but it still jumps back to 18...then 16's...then 17...then 15's...and so on. kinda eradic. hopefully will be able to get on a dyno this friday and see what kinda afr's and HP #'s i can pull. thanks again.

 

What are you seeing under boost?

 

10's and 9's. that's okay..right?

 

Yes 10s and 9s are perfectly fine. Most people run VERY rich...