Hello all, I am having trouble finding the cause of my current issue.
I rebuilt my 05 OBXT last summer and had an uneventful break-in period. I then began tuning the car with the guys over at cryo and without making that much power we were maxing out the MAF on the stock air box. I thought this was strange because almost every post I have read on the forum states that the stock air box is capable of 300ish hp. The logs were not putting up much more than stock boost. Fast forward and I changed the air box to the Cobb intake with enclosure and now were back with the same issue just with more boost and it has begun to lean out at the high end causing knock. I have double check all connections, smoke tested it, and it looks to be getting good vacuum numbers so I don't think it has anything to do with that. I installed a new MAF during the rebuild and have cleaned it a few times since with out any change. I have zero issues with normal driving, but generally keep it out of boost.
To summarize current issues are:
1. MAF sensor maxing out (looking at the tune it has been scaled up 13%)
2. leaning out at higher RPM
3. and the knock around 3800
Here is the short list of relevant mods:
RA short block
Rebuilt stock B25 heads
all new vacuum lines and in bay fuel lines
new in tank fuel filter
Fuel:
DW 750cc injectors
Tomei FPR set to 3 bar
DW 65c pump
intake:
stock manifold with phenolic spacers
and TGV flap delete
Grimmspeed top mount intercooler
Kinugawa 16g
Mishimoto turbo inlet
Cobb intake
Grimmspeed BCS
Exhaust:
Stock headers with Grimmspeed cross over
some aftermarket catless uppipe
Grimmspeed down pipe
and custom catback exhaust
Here is the last log after I made sure everything was tight. I probably wont make another pull until I find an issue.
Any help is appreciated!
R2 3rd gear pull after fix.xlsx