TPI 5.7L and SVO injectors

[Dave Zug]

I can speak to the SVO's with ONE part number, not to what ford rated them
in general though.  the 24's commonly sold in Jugs and Smellit catalogs etc
are rated 24# at 39.5 psig. a little ratio-math yields the 44 psi rating,
but you CAN run them at 39.5 if you have an adjustable regulator I guess.

My FP guage bit the dust on friday so I had to guess at my FP, and the runs
produced a perfect 0.88 - 0.89 or reading. car feels like it gained a tenth
or 2 but we'll see... Pulsewidths went from 14 (max-GM OE's) to 11.5
(max-SVO's) during drag runs.  I was nearly 90% static BEFORE the
changeover. This was a 383 w/ a dry 50-shot of N2O, shifting at 5300 rpm (a
12.6 car).



----- Original Message -----
From: <WEG1192 at aol.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, October 22, 2000 8:25 PM
Subject: Re: TPI 5.7L and SVO injectors


> Dave,
>
> Are you saying that Ford rates their injectors at a different pressure and
> you have to re-rate the 24 lb. injectors to 26.7? Can you elaborate here?
I
> have been running Ford  19 lb injectors in my TPI with no chip changes and
I
> am seeing BLMs in the 150-160 range and integrators as high as 180. I know
> this is a crappy way of running, but I am just trying to see how far off I
> can be and still have the GM logic correct. It runs kinda unsmooth (sorry
> best way to describe it) but it does run.
>
> Also, I've been thinking of how changing the injector constant effects
> tuning. Seems to me that raising the injector constant in order to match
> newly installed larger injectors should decrease the injector pulsewidth
for
> a given VE since the larger injectors spray more fuel for a given
pulsewidth.
> This in effect would keep the tune the same by compensating for larger
> injectors. But I found that increasing, Whoops wait a minute. I increased
the
> base pulsewidth, not the injector constant. Let me think some more.
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org