mikeGPT

Hey everyone. Ive just bought my first camaro, its a 2002 z28 a4 with 126 000mi. The car seems to run fine and the motor sounds healthy but when i put it on the dyno last week it only made 226whp and 244wtq? Its 100% stock and the runs were made with the maf unpluged, could this cause the numbers to be that low?

trey1010

iTrader: (3)

I would def think that could be the cause of such LOW numberS. why would it be unplugged?????

MikeG

iTrader: (33)

Uhh yeah, if theres a problem with the MAF then replace it. Don't just unplug it.

mikeGPT

Yah the maf is fucked so i just unpluged it for now and am running it in speed desity mode but could that really cause it to that down on power?

KevinR

Soo.. do you actually have a SD tune, or did you just unplug the maf and put it on the dyno?

mikeGPT

just stock tune with unpluged maf but still dont think it should be that down on power the car runs perfect.

JRENIGAR

iTrader: (37)

you said the car is stock correct? The factory sd tune should be close, I cant see it being off 50-70 rwhp... I would deff replace the maf and that should net you better results as the factory sd tune is verry conservatively tuned.

mikeGPT

Yah im going to pick up a stock maf later today and then ill toss it back on the dyno maybe tomorrow and see what happenes. I did a few pulls with a 5 wire truck maf pluged in and it made even less power?

mikeGPT

Think i may of found the problem. I just decided to put a fuel pressure gauge on the car to see what the fuel pressure was doing and its sitting around 30psi and drops down around 25-20 when i rev it up. Ive read that the pressure should be up around 58psi and should drop when reved up?

chrs1313

iTrader: (24)

yeah that fuel pressure is extremely low and I am sure you are super lean when doing wot pulls...

get the bugs worked out that is honda civic power lol...just kidding man

butler

fuel pump or filter. Not good. Too lean.

mikeGPT

So i did a walbro 255 swap in the car last night and that really woke it up so it must of been right lean. Still dont have a working maf for it yet but ill try and toss it on the dyno today before the end of the day and see what it makes this time. Ill hook a whideband up to it this time and see what the air/fuel ratio is like. What should a stock ls1 run for afr mid 13's?

WKMCD

iTrader: (2)

12.5-12.8. Mid 13's is a little lean.