I've recently been having trouble with my GC WRX. It was running at about 280hp but had started developing problems with the acceleration cutting and numerous check engine codes.

It's now back on the stock ECU and not a chipped Z4 STi ECU so I'm back down to stock power (250) plus whatever a turbo back exhaust and no cat gives.

What should I do to get back to 280hp or even 300hp?

I think the choices are between after market ECU with remap or adding a FMIC and increasing boost.

 

"A chipped Z4 ecu......"

Explain, please?

Is your car running a STOCK ecu which is mappable? If not, you are going to have to bite the bullet and get one, since modding these cars WITHOUT a map tweak is a recipe for disaster.

I'd go for the turbo back, decent panel filter and remap. Should easily make 280. My mate has a UK car that makes that sort of power, from those mods.

We assume you've looked at brakes and handling........?

 

It's already got a turbo back and after market filter.

The ECU that was causing the problems was a Z4 STi ECU that had an after market chip piggybacking on the stock one. That's now been taken out and a stock WRX ECU installed.

 

i dont know what version car you have but you need an aftermarket ecu asap, the esl boards are about the cheapest, 550 mapped i think.

your mods are probably decreasing power if theyre not mapped for btw.

 

As above, and could cause engine failure.