How much timing ?

[shawn13]

How much timing should I be seeing at 9-10 lbs of boost with 93 oct. gas ?

 

[marcspaz]

As much as the car will take before the computer wants to pull timing... LOL

This is just an opinion, don't give it to much weight....

I know most builders and tuners say no more than 30 degrees for an NA car on 93+ Oct. I haven't worked on an FI car in about 10 years, but back then the rule of thumb was you pull 1 degree for every 11%-12% increase in ci (not PSI) of volume added. Of course this would just be a safe starting point, not an exact, carved in stone number.

Adding 10 PSI to our cars is the same as having 436ci of volume. That is a 30% increae in volume, so I would assume you want to run a cooler plug and data log at 26-27 degrees to see how the car's computer likes it.

Now, I don't have recent experiance with these car, so one of the pros may have a better answer, but this is what I remember.

 

[Eric Brooks]

That is a loaded question.

Low 20s is about as generic of an answer as I can give.

 

[marcspaz]

LOL, hence my disclaimer...

 

[psfracer]

That is a loaded question.

Yeah, no kidding. So many variables.

 

[Eric Brooks]

Yeah, no kidding. So many variables.

Yep, like...

Air Temp
Coolant Temp
Cylinder Head Temp
CMCV Open or Closed
VCT Angle
Commanded Lamda

On top of Load and RPM

 

[shawn13]

OK Kool, I will quit worrying . thanks