PCM Diagnostics & Tuning - need help with a 2 BAR tune

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

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?

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?


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

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

nvm...

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

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.