Question for HP Tuner Pros
Thread Starter
Racer
Joined: Dec 2005
Posts: 281
Likes: 0
From: Phoenix AZ
Question for HP Tuner Pros
I recently had a mid sized cam installed, along with ported TB and manifold, long tubes/CATS, and CAI. After a tune I got the car back, and while it runs very well I can't help but wonder if there is any way to reduce some 'bucking' in a no load or light load condition while the engine is between 1,300 to 1,600 rpms. My tuner prefers to leave all sensors on line, not shutting down O2 sensors. I understand this 'bucking is due to the very fast mixture switching the C6s have. The question is whether there is any way to reduce or eliminate the 'bucking'. Do any experienced tuners have suggestions? Thanks in advance for any insight you can provide.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
I recently had a mid sized cam installed, along with ported TB and manifold, long tubes/CATS, and CAI. After a tune I got the car back, and while it runs very well I can't help but wonder if there is any way to reduce some 'bucking' in a no load or light load condition while the engine is between 1,300 to 1,600 rpms. My tuner prefers to leave all sensors on line, not shutting down O2 sensors. I understand this 'bucking is due to the very fast mixture switching the C6s have. The question is whether there is any way to reduce or eliminate the 'bucking'. Do any experienced tuners have suggestions? Thanks in advance for any insight you can provide.
Instructor
Joined: Apr 2008
Posts: 164
Likes: 0
From: Champaign IL
There is a timing breakpoint in this range. I scanned my car and made it buck to see what kpa range (load) it was bucking in, and watched the commanded timing when it was doing it, and smoothed out some rather abrupt transitions there. That helped a lot. Then I ve tuned the car, that helped also. You also learn to drive around it as it will still buck in some conditions (a stock manual will too).
---Matthew Hicks
