Made and fitted an internal wg screamer pipe yesterday on my standard decat downpipe, bit of an experiment, i cant seem to find any info on this anywhere so here goes;

Once its warmed up, when i put my foot down the boost comes in as normal around 4.5k, with the screamer its around 3.7-4k, then at 5.5 i get a massive surge of boost which i assume is over boost? Juat wondering if its normal for this to happen?

Im running standard td05, only got launsport rep exhaust and screamer, standard boost. Thanks for any info

 

I could be wrong mate but i`d expect a tdo5 with standard boost to kick in before 4.5k rpm

 

Really? Iv got a boggo standard v2 sti, with wrapped gt spec uel mani and up pipe, and 3" launsport exhaust?

 

You need a custom downpipe where the mouth should be seperated. If its not seperated then it will behave like a big leak.

 

Agree'd. Thats way too late

 

Yer iv made a divide and it is blowing past very slightly, but what i wanna know is why i get a massive surge of boost?

 

I dont know it can be anything. The wastegate penny may be touching your custom jobbie or the leak may be causing the issue. Who knows?

Have you got a boost gauge, check that & see what boost you are getting.

 

Picking up a gauge later, pretty sure its not touching as when i made it i used a mock td04 exhaust housing with no actuator rod and it seemed to open it should? If it because its leaking, why would a minor leak cause such a surge?

 

What boost should i have so iv got a reference?