fuel system or boost problem?

[asd_gst]

i have a 91 gst for those of you who havent read any of my other need help post, ok so the car under boost seems to bog down, and has a knock under full boost, most people say boost leak? i think fuel system, when i put in octane boost the car handled boost better didnt notice any boging down or shuttering on motor at high boost. fuel pump? stock fuel pump stock everything on car, but it has the bcs removed(or whatever the free mod is witht he boost controller), hack air can, and removed balance shaft

 

[kenamond]

Might want to rewire the stock FP and see if that buys you anything in knock. If so, that would point more toward a FP issue. It's something you'd want anyway if you upgrade the pump, and it's pretty easy to do.

 

[asd_gst]

Might want to rewire the stock FP and see if that buys you anything in knock. If so, that would point more toward a FP issue. It's something you'd want anyway if you upgrade the pump, and it's pretty easy to do.

what do you mean rewire the stock pump? like the whole entire wire? or just the conection, but im buying a aftermarket pump do i still need to rewire it?

 

[hdoerr]

Search Fuel Pump Rewire and you shall find.

 

[andy4g63]

You are saying, that after you put octane booster, car handles boost better. If so, then lower the boost and do the fuel pump and AFPR.

 

[asd_gst]

how do i lower boost its all stock no bc