Boost Question

[fEkuaR]

Hi Guys,

Quick question hope im not asking a question thats been covered a thousand times as i did a search and wasnt able to find an answer.

I have an r33 gts-t slightly modified relevant modifications;

Powerfc

Hiflow Turbo

T-Piece Bleed Valve

Split Dump

Trust turbo back exhaust

FMIC

The boost is set to 10psi however when under load in any gear is sitting on 7psi which it reaches very early in the rev range however it then slowly makes its way up to 10psi not reaching full boost untill around 5700rpm. Is this caused by the bleed valve as i was looking at purchasing a EBC in order to improve my mid range in a hope that it would make full boost as its supposed to. I dont think its the wastegate as its reaching the 7psi that the standard wastegate spring will allow very early in the rev range.

Anyhelp is appreciated,

Daniel

Edited September 9, 2007 by fEkuaR

[RANDY]

if it's a "Bleed" bleed valve, and not the ball-and-spring that some people call a "bleed valve", then changing it would certainly help, I would think.

It's bleeding off some boost, whereas the ball-and-spring type holds it until the desired pressure is reached before it releases anything. I guess you could check your blowoff valve too? Take it off, clean it, press the spring in by hand and make sure it's fairly tight. (or test it with an aircompressor if you can) And.... maybe also check the wastegate actuator? If it's coming open, or it's stuck semi-open, it'll be bypassing some of your exhaust gasses.

I wouldn't think a highflow turbo would delay boost by *that* much, so i'd check the above things first. (and even intercooler pipe leaks, but you'd be running rough if they were leaking... generally)