Turbo throttles (was Re: anti-lag)

[clayb]

Interesting subject. I'm debating what to do with my throttle setup, and have
been considering the merits of pre and post turbo throttle bodies. I currently
have pre-turbo throttles courtesy of the old Holley carbs. Why should I switch?

It would seem the pre-turbo throttle would allow the compressor to spin in low
pressure, during transitions to light throttle, and back to heavy throttle
again. This should reduce lag on throttle reapplication.(This isn't that great
of an issue for me, anyway.)

Also, no blow-off valve is needed

What are the merits of post-turbo, and combination pre- and post-turbo
throttles?

- Clay

Espen Hilde wrote:

> Hi!
> I have seen setups with 2 trottles ,one in front of turbo and one after.
> The compressor spinns much easier in lower pressure.
> This was on a dirttrack rally car.
> I have tryed carb in front of turbo and the adjustability of the output of
> the engine was much better.
> After the trottle is open I think the wastegate should be controlled by TPS
> possition.Adjusting the boost by increasing trottle.

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