Im thinking of turning down 1psi to make it an even 20. I want to run 20psi for a bit, I was tuned on 21psi and Im probably asking a silly question by asking if its going to make any difference if I do so. I doubt it will but always good to ask first

 

will do nothing

 

The only real way to find out is turn it down and do a log of it. The load cells you're going to be hitting will not be as high, but that doesn't mean it isn't going to knock. In all honesty, I would just leave it where it is. 21 psi is considered conservative. No need to turn it down.

 

alrighty. just gonna leave it as it. Thanks for the input 'fellas

 

Less boost + same fuel = richer than what you were tuned for.

 

^^^Less boost=different load (as stated above) The amount of fuel that it gets is dependant on the tune at those load values.