HELP! SR20 Problems

[atticus]

I have tried to search for this topic but I found nothing. Any help you guys can give me would be great. I have a 92 240 coupe with a Q's front end. I have just finished installing a what I think to be a red top. It does however have the fiins on the front of the head like a (s13) black top does. Anyway here is my problem: The car runs and idles fine, however when I give it full throttle and it hits full boost it begins to break up really bad. I did all the wiring myself, checked the CAS, changed plugs, checked timing, changed MAFS, checked for boost leaks. Can anyone give me some ideas as to what else I need to check for? I was actually thinking about changing the injector o-rings next what do you guys think? Thanks.

[NISTECH]

Did you upgrade the fuel pump?

[atticus]

No I still have the stock fuel pump( which I know works), And I am at stock boost. I really can understand why its breaking up like this at full throttle, and or full boost.

[NISMO_RB25]

The stock 240 fuel pump wasn't meant to supply the pressure needed under boost and could explain your problem. Most people with SR/RB swaps or KA-T go with a new pump and fuel pressure regulator.

Your spark plugs could also be bad.Your timing could also be off.

[s13sr20chris]

werd!

all those are on my mind too. the walbro pump is like $100. check timing and make sure your ign system is good stock stuff.

[atticus]

Im not sure what you mean by good stock stuff for the ignition system. I have a stock s13 sr fuel pump that I will try tonight. Could I possibly have a clogged injector?

[s13sr20chris]

i mean the ngk plugs and i guess thats it since you dont have wires, cap, and rotor.