External gate question

[dkonig]

Hey, just wondering if anyone knows a bit about external gates.

Have mine hooked up with direct pressure/vac straight from the intake manifold to the bottom of the gate and a seperate source to the top and regulating across the top to control boost. All works fine, but when you back off throttle or are at anything over about 2500RPM decellerating in gear (ie whenever there is high vacuum and revs) the gate opens as the pressure at the top of the gate sucks it open.

Is there any way to remedy this?

Daniel Konig

[Sydneykid]

Hi Daniel, what car?

[Steve]

All the diagrams I have seen for external gate (not many), and the way I have my gate set up is with a line from just after the turbo outlet to the bottom of the gate, and a Tee off that via the soleniod to the top of the gate.

There is no vacuum there (because it is before the TB?), which I have tested by fitting a vacuum guage, and it works well without the problems you describe.

If you are having trouble understanding what I mean, have a look on the Apex USA website, and download the AVCR PDF, has nice pics.

Good luck.

[dkonig]

Actually, that makes sense, problem must be related to it being after the throttle body....

Cheers

Daniel Konig