fuel cut

[14u2nV]

What is it that decides when you hit it? My last galant, I was running 15psi, and never hit it on a stock chip. My current galant has a stock chip, and I am hitting it everytime I hit full boost which is set at 12psi. Car runs perfect, pulls hard up to about 11psi, then feels like I hit a tree. It's very annoying as every time I try to pass someone it goes to full boost. Is there anything besides the chip that can help this? I am getting the chip either this weekend or next (whenever my chip programmer gets on it /ubbthreads/images/graemlins/tongue.gif ), but is there anything I should look for that is bringing this on? I never had it in my last car so I never got into researching it. /ubbthreads/images/graemlins/dunno.gif

 

[ktmrider]

MAF determines it IIRC.

Stock 1g MAF would cut around 15psi, lower if you have a leak somewhere.

 

[1990ggsxnj]

^^ If you have a boost leak the air being pulled in by the turbo will be read by the MAF but when it leaks out through a leak the pressure will be less on your boost gauge. Do a Boost Leak Test.

 

[14u2nV]

I have maft in blow-through close to the t/b.

 

[jepherz]

The ECU determines when to hit "fuel cut" based on how much oxygen is entering the intake. Colder temps result in more air, so this would increase the potential. Like mentioned, a boost leak could also cause it, although not likely in your case. Or possibly your maft is tuned to cause it, telling the ECU there is actually more air entering the combustion chamber than there actually is.

 

[14u2nV]

Ok, I changed the MAFT settings and now it stumbles a little at take-off, but runs like a bat-outta-hell when boost kicks in. It also tops at 12psi with no fuel cut. It is set at stock injectors, but for a 2g instead of 1g. Had it set at 1g and that is where I was getting fuel cut. I have read somewhere that sometimes you have to set it for 3.5" maf even though only using a 3", but I never saw why. Could that be my issue? I'm stumped.