[Diy_efi] Re: Throttle before turbo on EFI

[Josh Wingell]

The biggest problem with this type of setup is intercooler pipe leaks.

If you blow an intercooler pipe off with the throttle before the
turbo, the engine will essentially be getting full throttle, and there
wouldn't be a damn thing you could do about it from the cockpit
besides shut down the ignition.  This is a big time safety issue.

Any small leaks in your intercooler pipes would also wreak havoc with
your tuning and idle.

Some cars have used this (older Turbo Dodges).  But I don't think it
has been used on a production car since.  There are reasons for this.

Josh
----- Original Message -----
From: "Bevan Weiss" <kaizen__ at hotmail.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Sunday, April 27, 2003 9:32 PM
Subject: Re: [Diy_efi] Re: Throttle before turbo on EFI


> >  > How's this for a idea? I'm not talking about your normal carbed
> >  > "draw-through"
> >  > type of setup. Rather a intercooled large turbo (aprox T66)
with a
> >  > huge (105mm) throttle body in front of it.
> >
> > You seem to have thought about this setup quite a bit, but I
wonder if
> > such a setup would be drivable at anything but wide-open?  Where
would
> > such a motor be run...street? strip?
>
> I haven't seen the rest of this thread however I can invisage some
problems
> when you come off WOT as mentioned...
> A blip on the throttle will see WOT exhaust gas attempt to leave the
exhaust
> side turbine... however to do this it would have to spin the intake
side
> turbine which would cause excessive vacuum after the throttle body,
hence
> slowing down the exhaust gas leaving.  The next engine cycle would
see the
> exhaust gases being at pressure and the intake being at vacuum and
hence
> would reverse the gas flow (ie exhaust gases would enter the
combustion
> chamber)...
>
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