I still cant seem to figure out this problem that I am having with tuning my turbo 5th generation prelude. I am running a obd1 p72 ecu tuned with crome, the car boosts great until 4000 rpms and then bumps and jerks like hell. I also have no vtec crossover, and its sort of weird because the car only does this when vtec should just about be engaging on that ecu. my vtec solenoid is fine, the ecu is hooked up right with the harness, and my vtec pressure switch is turned off.
any suggestions would be awesome.
thanks

 

oh yeah, we have also set vtec all over the place and it still wont kick in.

 

any suggestions at all would help, even if you are not sure because we have run out of ideas.

 

bumpin christ