help WRX STi v2

[navuachef]

Hello!

i have a 1990 GT leagcy wagon running a v2 WRX STi setup (engine,box,driveshafts,diffs)

the mods done are Prova eiffel nurnburg ring concept ECU, 2.5" downpipe,tomei froged pistons,tomei sus 304 extractors, solid alloy pulleys from zerosports,500hp fuel pump,and a few other bits n peices.

it has issues!! the car wont rev over 4000rpm and backfires hard.it was running OK but couldnt handle full throttle wiothout massive backfires,the check engine light is on and various things are playing up like the tacho and seepdo have stopped working and my temp guage goes up when i boost.

i had the ecu plugged in and the printout read 22 and 33, spped sensor fault and knock sensor??

i have been advised to change back to the standard wrx sti v2 ecu

help would be good

[rex-leggy]

yea change the ecu back! if its the wrong ecu then you could be doing some harm to your engine .

you haven\'t messed with the speed cut by any chance?

[kamineko]

sounds like fun

but was it working fine before hand? or have you just slapped this together and its not going?

[navuachef]

the prova ecu eliminates speed cut,increases boost and eliminates rev cut, bumps boost to 16psi. the car was revving over 4k but backfiring hard, one day i turned it on went for a drive and it stopped revving over 4k. ihave never had the standard ecu in with this engine

[kamineko]

bad speed sensor can cause terrible running. speedcut is irrelevant, it still wants the signal. and as you might expect, sort the knock sensor too