I have several mods including: aluminum flywheel, pettit street port, down pipe, mid-pipe, removed air pump w/ new pulleys, stock turbos modified to non sequential. Since i have read here so much about not going higher than 10 psi on the boost, i was wondering if the a/f ratio was the determining factor on whether or not i can up the boost, and also, what is the a/f number that i should be running where knock will not be a problem?

 

How are you maintaining boost to 10 psi with those mods?

The stock ecu fuel cuts above 10.7 psi in the upper rpm range. It is not designed for boost levels above that.

Safe A/F ratios are in the low 11s:1 under boost.

 

Sorry, I forgot to mention microtech ecu but my question remains the same. if i am maintaining a safe a/f ratio with stock fuel pump and injectors, is it all right to boost higher or does intake air temp, due to a stock IC now become a factor?

 

also, in regards to the boost, fortunately, I have access to a state of the art, abrasive waterjet cutting machine which allows me to cut whatever size exhaust pipe gaskets I need to alleviate boost creep

 

Well, the fact that you are running a Microtech has a LARGE bearing on your question....

With the stock injectors, you can maintain a safe A/F ratio up to about 13-14 psi, if you are willing to run duty cycles in the 90+% range.

A safe a/f ratio is in the low 11s:1 under boost.

And yes, you should not be running around boosting 14 psi with the stock IC, you will have very hot intake air temps and your turbos will be dying because of the pressure drop. I wouldn't run more than 12 psi with the stock IC, and I would lower that to 10 psi if any kind of sustained boost situation (track event).