i,ve got a early 240 bhp wrx which feels like it,s holding back mainly in 4th and 5th gear it,s got good boost pressure and i think the fuelings ok i wonder if the knock sencer is over retarding the ignition it feels like the brakes are on has anyone experenced this problem if so whats the fix

 

first, make sure you are running on at least 97 octane fuel as these cars are run on 100 octane in japan and the ECU is set up for this.

make sure you use this fuel all the time as using 95 will kill your engine in a very short time.(optimax is the best at 98.6 octane!)

when you have 97+ fuel in the tank try re-setting the ECU.

the easy way to do this is to disconnect the battery for around an hour, connect it back up and drive the car for around 30 mins.

hope this helps

jonny

oh and welcome to scoobynet

 

Another way to reset ecu :

http://www.saxonfields.freeserve.co....htm#_ECU_Reset