730 rev limit

[Dave Zug]

The scope results are inconclusive.. they came up different on a couple of
occasions on a couple of different cars (used a TPI 305 car as a
control..and I think the wire fell off once.   man that 153k mile TPI-305
car went straight to 6300 and sat there... 4 seconds of neutral-WOT.)

The 305 went static(again.. I think the wire fell off). The other 350 car
had noise on the injector line (lotsa (neg-14v) reading spikes but the o2
showed things just fine. 8.5 ms at 7000 is what I have max.. and the PW's in
the 350 car were lower (did the test in neutral.. no load)

Thanks Bob.

----- Original Message -----
From: rr <RRauscher at nni.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, May 27, 2001 7:14 AM
Subject: Re: 730 rev limit


>
> What PW's are you getting at the high rpm? If the signal is going
> to ground then you are running out of injector. There's not a
> lot of time to open & close an injector at those rpm's. The injector
> sizing moves from enough flow for X hp, to enough time at X rpm.
>
> As a data point, may not help, a friend of mine is running a '747
> up to 7500+ rpm without a problem.
>
> BobR.
>
> Dave Zug wrote:
>
> > I've re-subbed.. is everyone here or are we still recovering?
> >
> > I'm having some wierd stuff happening here with a '730 running AUJP. The
> > motor.. which has a rev-kit, lightweight valvetrain components and 130#
> > springs is cutting power at about 6300 - 6400 RPM.
> >
> > fuel is good, spark is good, ..,..,..  there is NO rev limit set..we've
> > checked or replaced many things on this motor to no avail. We've SCOPED
the
> > injector signal (dual-fire TPI V-8 car) and the results are sketchy
there..
> > need to do it again.. looked like the signal locked to ground for a bit
in
> > ONE test and was fine in another.
> >
> > I'm wondering if the backup logic on the netres is failing when it sees
HIGH
> > RPM.
> >
> > anyone have any clues??
> >
> > ANYONE USING THE 730 to rev to 7000 rpm please let me know that it is
> > possible.  Thanks.
> >
> > PS.. ANHT HAC rev limit comments need a bit of help.. the limits are
based
> > on DRP's, and higher values mean lower RPM limits.  I'm sure you all got
> > this but there it is again.
> >
>
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