sbcxtreme

I have a 2007 z06 that I just put a cam in. The car has a novi 2200, headers, 68# injectors, etc. I just bought HPTuners and am in the process of learning to use it. The car ran smooth prior to the cam swap, no drive-ability or starting issues. I knew I would have to adjust the tune afterward, but im just looking for advice on what parameters typically need adjusted.

The car is very slow to start now. I would say it probably cranks 20 times or so before it fires. Cruising on the highway around 1500 rpm at a VERY light throttle it wants to buck/surge a little bit, but as soon as I give it a little more throttle it clears up. When coming to a stop the rpms want to drop almost to the point of it stalling.

Any advice is appreciated!

Edit: it seems to start quite a bit quicker on a cold start, but when its warm it cranks a while.

schpenxel

Cam specs?

sbcxtreme

Not really sure what all info to list, but:
260 INTAKE, .635 lift
256 EXHAUST, .596
116+2
The cam card says LS1, so Im not sure if these numbers will be the same on an ls7?

sbcxtreme

Still looking for advice on this. I've searched quite a bit and tried some of the things that ive found, spent a few hours yesterday trying to get the warm start issue figured out, but no luck.

russ472

you probably need to increase airflow idle settings to control hard to start and stalling issues.

idle > airflow > airflow final minimum. maybe try to increase by 20% and see if it gets better.

sbcxtreme

I will try that again. I went up in increments up to 35% and didnt notice a difference, but I will try it again.

schpenxel

Are you running MAF or speed density or mixed?

sbcxtreme

Maf

realcanuk

Try playing with cranking fuel also.