[Diy_efi] WI, methanol, and corrosion

[Grant Beaty]

Some cars do not have plumbing room for a large front-mount intercooler.

My Supra has a Spearco FMIC rated at a 1.5 psi drop at something like
1100cfm. Most of the piping is 3". Now there is no way in hell a 3L engine
will flow that much, and I have an unmeasurably low pressure drop from the
turbo oulet to the intake manifold. From what little I understand of
airflow, pressure drop is proportional to velocity^2 times density, right?
Of course the velocity stays about the same (or goes down) with higher boost
pressures.

IAT is near ambient, but I'll take Alky and a bigass IC, please ;)

If I ever get this alky injection working, I'll post airflow #s with it on
and off, to see if the cooling really increases total flow.

Grant Beaty

----- Original Message -----
From: "JET" <justhompson9172 at msn.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Thursday, January 23, 2003 1:38 PM
Subject: Re: [Diy_efi] WI, methanol, and corrosion


> > You get the benefit of an intercooler, plus the
> > benefit of water injection.  Seems to me that having
> > both would be a bit better than having just WI, but
> > there's a lot of plumbing you don't have, plus the
> > weight...  And of course, no pressure drop through the
> > IC.  So it may end up being better than both together.
> >  And it would appear on the face of it that WI is
> > better than just a plain IC in terms of mass of air
> > charge in the cylinder per cycle.
> >
>
> I do not agree with this at all.  The benefit of the IC far outweighs the
> benefit of WI.  Without an IC you can run a max of 9 psi, with a good FMIC
I
> am running 20 psi, with water injection it goes up to 23 psi (all on a DSM
> on pump gas).  I have never seen anyone try it, but I would think you
could
> only run ~13 psi on just WI.  Yes it will cut down on lag, but give me 200
> RPM more lag  for an extra 7-8 psi!
>
> JET
>
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