Darren P

iTrader: (1)

I have a 2002 Z-28 with a T-67 front mount turbo
I have just converted to a 2 BAR setup and I am having problems
the car runs fine untill I go into boost and then it goes lean very fast
I set up the main VE table, the boost Enrichment, the power enrichment, and the enrichment rate like it shows on the demo
then I pulled back around 4deg of timeing in the upper part of the range for safety
then after the first run I was leaning out very fast under boost (From 11.8 to 16.X faster than it was building boost
I dont want to blow my stock engine
I have a maf tune that runs great but I am loosing boost and want to log and see how bad and where at

I am including the origonal file, the one that I first modified and the second one where I pulled timing and added to the topend of the Main VE map
and a data log scan where it is going lean
what am I doing wrong
also when I was data loging the STFTs and the LTFTs show 0 above 105KPA
so any help would be great
have I got it set up wrong or just making a n00be mistake


Thanks Darren Purser

NYSS Guy

iTrader: (1)

The first thing that popped into my mind was fuel pressure. I don't see any notes about your fuel system, are you sure it's keeping up? STFT's and LTFT's should be 0 everywhere while you're in speed density. I didn't see any attachments, but what values do you have in the BE table?

Darren P

iTrader: (1)

I have been running the car with a MAF tune for almost a year now and it has been fine
the fuel sys = walbro 255 intank, motron 60lb injectors
it has made 475 RWHP and around 580 RWTQ and ran 11.70 with the MAF tune
I like the tune and it runs great but it is loosing boost
it falls around 2 psi no mater how it is set or what boost level it is set at
the 11.7 run peaked at 10.0 pounds but fell off to less than 7 by 5200 RPM
I am trying to data log the boost with the 2 bar set up
from what I understand it works with the maf untill the maf is exceeded and I am not there yet
when I get that high i will take it off
untill it, along with the maf tune that I have is my back up

blackbird345

You're probably losing boost because the turbo is too small and can't keep up.

MECHAM

iTrader: (4)

nvm...

MECHAM

iTrader: (4)

boost really has nothing to do with MAF...your 2bar MAP sensor should be reading 105-210kpa..that is your boost. so on your scanner it should read 0-210kpa.