What size pipe should go to the Wastegate?

[antnicuk]

I was wondering what size pipe you guys with singles use to feed the wastegate and where you take the feed from.   I am still having problems with my boost going up.  I am currently taking the boost feed from one of the little pipes coming out of the FD UIM oposite the Brake Servo.  These are very small though and i think my wastegate seems to bleed off a lot of air via the valve piston shaft which would indicate to me that i need more air going to it to keep it open.........  The diaphram is ok, its the only thing i can think of trying before i torch the bl00dy thing!!!!!

Any help would be greatly appreciated..... especially if i am going to get to this track day or rotorstock!!!!! :god

Its a HKS FD Cast Manifold with a GT35/40 (T4 flange)

[K1HKS arse]

Intercooler pipe straight after the turbo before the throttle body,yours is after the throttle body.Pipe size is 4mm ID from memory.

Never had problems with boost creep,hope that helps

Gary

[antnicuk]

cheers gary, i am going to weld a short pipe to my intercooler pipe tomorrow and run a bigger hose,  i will probably go for 8 - 10 mm.  I cant see too big being a problem.

regards
tony

[K1HKS arse]

Is that 8-10mm outer diameter??

I have used copper brake pipe on some as it doesnt melt with rubber hose at the joins.

[antnicuk]

8 - 10 mm ID, i have some 10 mm fuel pipe, that should do the trick.
Cheers

Tony