[stage1]

With a totally stock motor,how much boost can I use with a 100 octane chip,with the cat conveter in place?

 

[Steve Wood]

You will have to experiment to find out. It may vary by several pounds from car to car depending upon chip parameters, engine condition/combination, ambient weather conditions, quality of that batch of fuel, etc.

Turn the boost up until you begin to see timing retard and then increase the fuel pressure a couple of pounds. If you still have retard, reduce the boost until the retard does not occur.

Don't let anyone tell you that a little timing retard all the time is okay unless they are buying your next engine.

 

[ULYCYC]

stage1:
With a totally stock motor,how much boost can I use with a 100 octane chip,with the cat conveter in place?

What gas are you using? I hope you mean with 100oct fuel or more or with alchy...