allout06

iTrader: (11)

First of all, some of you ahve seen my recent posts about my cam and intake swap. Well i finally took it to a tuner, mike norris @ norris motorsports to be exact here in indiana. Id like to start off by saying thank you to mike, awesome guy to work with and he knows his ****! Now the thing that scared me though, hes been doing this a long long time, and he couldnt figure out what was up with my car. ok heres what was going on..


When i got there, he puts it up on the dyno, hooks evrything up and does a base line ll...the car put down like 236 hp......The reason being...the car was waaaaaaaaaaayyy waaaaayy lean... He kept messing with it and messing with....he finally got it to a safe AFR...and did the final dyno pull that scored me 383/360...not too shabby, but, with this cam, i had the impression i should b more in the 400/380 area. He said he had to force the car to put fuel to the motor. So much in fact, that he said he had the AFR set for like 10.1, cuz it would only do 13.xx. Hes like "in the 10 years ive been doing this, ive never had to do this to a car to adjust the fuel trims.." and he couldnt really figure out what was up. He said the fuel pressure checked out, and the o2's were working. He did say though the injectors are maxed out. He told me to go ahead and replace the MAF and pick up some 30lb svo injectors and if it runs really rich, that was the problem...he said it could also be the PCM not calculating the tune right? or someting like that...do you guys have any ideas? it kinda stumps me


Mods are in sig!

heres the graph..

01ssreda4

iTrader: (96)

I would say injectors is a solid investment. Some say they are good to 450 hp, I say they are needed after you pass the bolt on level. The S.A.E. says you aren't supposed to run injectors past 80% duty cycle. They already are likely that on a bone stock motor. See what I mean?

I would recommend a set of FIC rejetted/flow-matched stockers over SVOs.

White Shadow

If it was a 98 computer I would agree but I think it's highly unlikely on your year model car.

allout06

iTrader: (11)

Do you think that is part of my problem here? do ya think I'm down on horsepower also? He said he's telling the PCM to run like a 10.1AFR just so it'll b in the 13's. So he's forcing fuel but it isnt delivering I guess? What about the MAF? Sry for all the questions. Just irks me to see everyone else with this cam hittin 400-415ho and 375-390 torque and I'm hittin 380.....and 360...

Hmm....it was gonna b my last resort....

01ssreda4

iTrader: (96)

Did he mention what the injector duty cycle was? And the fuel pressure was good all the way through the WOT passes?

babbage1109

iTrader: (11)

I'd bump up to a 85mm maf as it is. The mods suggested aren't terribly hard to change and always an improvement.

trans_am7935

iTrader: (15)

i have a spare SLP MAF for sale if you want it, but i would go with the GM 85mm MAF instead of the SLP one. i went from the SLP one to a 2003 corvette MAF

nocooler

iTrader: (5)

Sounds like the pump to me.....verify pressure @ WOT.

JRENIGAR

iTrader: (37)

agreed... Had a friend with a 04 gtp and this was the problem with his. Ran fine but inj duty cycle was maxed and shouldnt have been on the dyno. It also had 3-4 degrees of kr that it shouldnt have had. Pump eventually went out months later and when new stocker went in inj duty cycle went to normal and No kr......

Duffster

iTrader: (103)

If you haven't already, post this into the tuning section and I'm not 100% sure but ask by telling the computer to run 10 to achieve 13, is this PE table raping he's doing?

3.8redbird

iTrader: (3)

Looks like mine when the Fuel pump was going out. a week later I couldnt go over 1500rpm due to no fuel. New pump and 5500rpm later all was good.

Stock pump?

allout06

iTrader: (11)

Yes, he said the duty cycle was at 100%, sry i thought i mentioned it. And he said my fuel pressure looked good, he didnt specify what it exactly was, he just said it looked good. I called him, waiting on him to call me back to see if he remembers.

This was my plan, dont you have to have a different pigtail? where can i grab one? thanks man

He mentioned getting the SLP MAF, and one off a z06, he said either would work, i just have to find a pigtail. like mentioned earlier i was gonna look into the 85mm off a Z06. What are you wanting for the SLP?

waitin on his call. Hes really busy so it may take a day or two.

Ok will do, wasnt sure where to exactly post it. lol.. and yes, he was raping hte PE tables pretty hard haha...he said he was forcing it quite a bit to richen it up. its still a little on the lean side...but he said its safe to drive.

im assuming stock pump, im the 2nd owner, so ya probably. Car has 109k on it now...

So apparently i have a fuel problem.. Could this really hinder me quite a bit of power or no? Anyone think my #'s are a little low? also, how much of a PITA is the fuel pump to change? I had an old 92 camaro when i was a young broke kid and ended up cuttin a hole in the rear hump and changing it that way. i really dont wanna do that to this car... thanks for the help so far guys.

allout06

iTrader: (11)

a little update..

Mike called and said the fuel pressure was right at about 55PSI at WOT for those who wanted to know.

JRENIGAR

iTrader: (37)

My friends fuel press was good too but a pump fixed his problems.

allout06

iTrader: (11)

ok, well, at least i have a starting point.... You guys suggest a walbro 255? do i need the hot wire kit?

So imm a buy...

walbro 255
Fast 36lb injectors
Z06 or SLP MAF (whichever i can find cheaper)

hopefully this fixes my problems? lol.... anymore advise is def welcome

Duffster

iTrader: (103)

If he admits to 'raping the PE Tables' then he admits he can't tune... find someone else.

O2Form

Ever check the injector screens for rust or dirt? I've seen some very dirty injector screens already. Fuel filter clean?

allout06

iTrader: (11)

Fuel filter is new and I checked the injector screens when I swapped intakes. As for as him being a tuner. I thinks he's a good tuner. He's pretty well known around here and the east coast and Florida. He didn't wanna send me home with my stock 15+ AFR...he told me to get injectors and come bak. In the tuning section they are saying its not a fuel delivery issue. Just my injectors.... I wish I knew how to tune.....

01ssreda4

iTrader: (96)

Go FIC for injectors

allout06

iTrader: (11)

these?

http://fuelinjectorconnection.com/sh...&productId=178