timming pulls under boost !!!wtf
Thread Starter
5th Gear
Joined: Sep 2008
Posts: 5
Likes: 0
timming pulls under boost !!!wtf
Hi, New to the site .Hopeing you guys can help. I have a 2001 Z06 that i put a HP twin turbo setup on. When the car makes boost the timming gets pulled like 20 degrees or more. There is no dettination or pinging, engine is running fine. I put new knock sensors and 02 sensors with no change. we desensitized the knock sensors and the car runs grate and makes about 510hp, but afraid to tune the car for max hp( about 640 or so) on the current set up with this ishue. Dos anyone have an idea whats up? I have put about 600 miles on it with no ishues but scared to bring the power up.
p.s. the gas is 93 and fresh .42 pund injectors.6-7psi boost.useing hp tunners on a dyno
p.s. the gas is 93 and fresh .42 pund injectors.6-7psi boost.useing hp tunners on a dyno
Tech Contributor
Joined: Jan 2007
Posts: 19,454
Likes: 1,161
From: Dyer, IN
Hi, New to the site .Hopeing you guys can help. I have a 2001 Z06 that i put a HP twin turbo setup on. When the car makes boost the timming gets pulled like 20 degrees or more. There is no dettination or pinging, engine is running fine. I put new knock sensors and 02 sensors with no change. we desensitized the knock sensors and the car runs grate and makes about 510hp, but afraid to tune the car for max hp( about 640 or so) on the current set up with this ishue. Dos anyone have an idea whats up? I have put about 600 miles on it with no ishues but scared to bring the power up.
p.s. the gas is 93 and fresh .42 pund injectors.6-7psi boost.useing hp tunners on a dyno
p.s. the gas is 93 and fresh .42 pund injectors.6-7psi boost.useing hp tunners on a dyno
Drifting
Joined: Dec 1999
Posts: 1,541
Likes: 2
From: Raleigh NC
Take a look at your burst knock tables. It is used to predict knock. When the PCM detects large airflow changes it will pull timing to prevent knock. FI is throwing it off. I think that only accounts for 4 degrees. Take a look at your IAT spark correction table as well. I believe you can be pulling up to 8 degrees there.
