hi,

i have a 03 wrx it has 3"de-cat, 3" milltek cat back and collins d/v these are the only engine mods.the boost is surging,sometimes holding back an somtimes boosts fine. really really annoying

someone please help me before i smash it up!!!!!!!!

 

can any1 help me?????

 

Its very likely you need either a remap or a non OE boost controller, I've no direct experience, but its not an uncommon problem with decat DP's and TD04's.

Simon

 

bttt

 

Same problem here with a 51 WRx but to make it more confusing the only mod is a cat back system fitted yesterday and the problem started before that?

 

let no if you solve the problen as i havent got a clue!

cheers

 

It' overboosting, the ECU is compensating using it's boost control strategy, you probably only notice it in higher gears. As mentioned, using an aftermarket boost controller or a remap will sort this.