What is a good setting for 100 octane racing fuel for my IX:

3" Works TBE
HPF Full Intake
Hallman MBC
Custom Dynoflash

I got my MBC set to 22psi on 93
and I normally set my boost to 26 on 100 octane.
is 26 too low?

 

bump

 

boost whatever the hell you want on 100 but where you have it is fine.

 

26 is a bit on the agressive side, but ok.

 

^ 26 is fine just has to make sure the car dosen't pull timing.

 

I wouldnt go too much higher on the stock turbo. It pretty much peters out anyway. Esp w/ stock LICP and manifold.

Here is my EVO 9 - 26psi - EcuTek - 100oct

 

Very nice numbers.

 

well since it only tuned for 93 I think 26 is ok on 100, I don't run it on 100 that often anyway because its like $5.00 a gallon. I keep it at 22 on 93. The only thing is I don't have ARP head studs?

 

Thats what Al told me since im tuned for 93

 

Doesn't matter what you're tuned for, you can do whatever boost you want on 100oct. If you go over 26psi, it will make more torque, but it won't make much difference in peak WHP, since the turbo can't sustain those high boost levels for long.

 

On second thought, you might not want to go that high on stock head studs.

 

It's not a problem on the stock head bolts either.

 

Yea? If your tuned for say 91 octane then crank the boost to say 23psi when using 100 octane you will not run lean? Seems like a/f will need to be re-tuned, no?

 

100oct just keeps the cyclinder cooler - that's all.

If you were tuning for 100oct, and you ran 93 at 22psi - that's when you could have problems. B/c of aggressive timing, fuel mix, etc.

 

30 psi all day, OK. No problems.