Intro Post

[Bruce]

From: "Jesse Ruppel" <ruppeljw at capital.net>
Subject: RE: Intro Post
> Factory setup of the 7M-GTE uses a cam position sensor (they just dropped
> it into the old distributor hole for the 7M-GE and it drives off the
exhaust
> cam) to get crank position and the ECU drives a trio of direct fire coil
> packs.  Frankly, I don't know much about ignition because historically the
> OEM ECU does a good enough job of keeping things under control until very
> high (500+ RWHP) levels are reached.  This was one of the reasons why I
> wanted to retain the factory ECU and just play with fuel.  This is not to
> say that more power could not be obtained through different ignition
tuning
> of course.

Unless you compare it to something, you don't know what your loses are.
Using a Hall Cam sensor drops you into the GN (1227148) ecm.  There are lots
of 10 and 9 sec GNs using that ecm (10s in a 3700# takes a couple ponies)

> Hmm interesting idea about using the Syclone or GN systems - I had never
> considered that.  Anyone performed a swap such as this or have details on
> the systems?  What system do they use to determine mass flow?

The GN uses a MAF.  In the aftermarket is a devise called a Translator Plus
that allows you to use a later MAF and read up to 510 grams/sec of air.

> I have nothing against MAF systems in general and am aware of the benefits
> they have over speed-density systems (no manifold filling issues, etc).
> However, most OEM units I know of are quite physically restrictive and
rail
> out before the 450+ RWHP level I am building my car to be at.  Of course I
> am sure there are components out there somewhere that might work in my
> situation - just a matter of finding them :)

With a change of injectors drivers in the ecm you can run 82#/hr injectors.
I have the other drivers and am running 55#ers, and drivibility is
excellent.  Also with the mods I've made to the MAF things are extremely
accurate, and none restrictive, ie 4" pre turbo pluming, located MAF right
by throttle body to most accurately measure the inlet temp for the air calc,
etc etc.
Bruce
>
> Thanks for the input, and if you have any more suggestions I would love to
> hear them!
>
> Jesse Ruppel
> ruppeljw at capital.net
>
> 87T Supra
> 87T 4x4 Pickup
>
> > -----Original Message-----
> > From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> > Behalf Of Bruce
> > Sent: Sunday, November 12, 2000 6:25 PM
> > To: diy_efi at diy-efi.org
> > Subject: Re: Intro Post
> >
> >
> >
> > Personally I'd consider going to a different ecm, that's already hac'd.
> > For all the work your going to do here, you still only have control of
the
> > fuel.  Going with a GMC Syclone or GN ecm gets you completely
tunibility.
> >
> > More specifics are needed about what type of ignition system you have to
> > make a selection of something else, or if there is a simple alternative.
> >
> > Also, don't get too down on MAF systems overall, there are some
> > clever ones
> > out there
> > Bruce
> --------------------------------------------------------------------------
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