[Diy_efi] RE: Throttling intake air -- references

[Grant Beaty]

My BC is referenced to the compressor housing. Actually its bolted directly
on the compressor housing. If it were referenced to manifold pressure, it
wouldn't open at all when I modulate the throttle for 8ish psi, and it would
probably surge like a mofo, since pressure ratios should be higher. I think
this is what Andi B. was seeing with his T64 surge problem, his BC was
plummed off the intake mani.

Grant Beaty

----- Original Message -----
From: "Andrew Theurer" <habanero at us.ibm.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Thursday, January 16, 2003 11:16 AM
Subject: Re: [Diy_efi] RE: Throttling intake air -- references


On Thursday 16 January 2003 06:34, Grant Beaty wrote:
> And this is with a wastegate, I can hear it open modulating the throttle
as
> low as 8ish psi. Without the WG the pressure ratio would be even greater.

Grant, is your WG refrenced to manifold pressure or pre TB pressure?  I
suspect manifold, and would expect the large pressure ratios to drop
significantly if it were refrencing pre TB pressure, right?

FWIW, the "new" way to control boost may be more efficient, but IMO, the
multiple relationships, throttle->intake->combustion->exhaust->turbo is to
complicated to get a solid control machanism.  If someone thinks not, please
go ahead and prove me wrong.  I would love to see one, but until I do,
what's
the point of going back and forth?

What about a "new" wastgate that is a variable A/R turbine housing?  Boost
is
controlled by increasing A/R to the point where is maintains desired boost.
OK, making a housing like this may be difficult :)  I guess this is kind of
like VATN, but better :)

-Andrew

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