enright82

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

The Pink Ninja

iTrader: (23)

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

enright82

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

KAS35RSTI

iTrader: (73)

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

KAS35RSTI

iTrader: (73)

Agree'd. Thats way too late

enright82

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?

KAS35RSTI

iTrader: (73)

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.

enright82

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?

enright82

What boost should i have so iv got a reference?