RPM limits of GM computer/ignition module?

[Bruce Plecan]

COIL?.
Coil Near Plug means 8 coils on a v8
Bruce



>
> If you are talking about the SDI unit, they don't make
> it anymore, and it has serious reliablity issues, and I
> don't know what its rpm limits are.
>
> Mine had an issue and at least one other had exactly the
> same issue (all conditions matched), and at least 1 other
> had related issues that caused all 3 do uninstall the SDI
> and go back to the optispark.
>
> I have heard people claim that it is the coil itself
> that cannot spark that fast, so replacing the coil
> with one of the aftermarket ones may do it.   I believe
> TPIS claims this, and probably others.
>
> I believe mine has a hypertech coil and mine appears to
> run smoothly until I hit the rev limiter (6700).
>
> Roger
>
>
>
>
>
> -----Original Message-----
> From: "owner-gmecm at diy-efi.org" <owner-gmecm at diy-efi.org> on behalf of
"Bruce Plecan" <nacelp at bright.net>
> Sent: Thu, 22 Feb 2001 11:54:42 -0500
> To: "gmecm at diy-efi.org" <gmecm at diy-efi.org>
> Subject: Re: RPM limits of GM computer/ignition module?
>
>
> I've forgotten the supplier, but there is a Optispark to Coil Near Plug
> Conversion.
> If none of the LT1 guys remember, holler at me and I'll track it down.
> Bruce
>
>
>
> >
> >     Have a friend with a solid roller 400 LT1, and regardless of
computer
> programming
> > can't seem to rev over 7000-7100 rpm - it basically feels like a rev
> limiter is hitting
> > in that range.   He is using an '8051 95LT1 pcm - tried rev limiter
values
> from 7500
> > to 9000 with no difference, so we are thinking it's hardware related.
> (Car has a
> > msd digital 6, rev limiter there set at 7500).
> >
> >      Some people have indicated that it may be a problem with the stock
> computer -
> >  though Ed Wright says that they have had cars that would turn that high
> on the
> > dyno with the stock computer, and he thinks it's opti-spark related.
> >
> >     The best hypothesis I have heard is from an individual who believes
> it's
> > ignition module related - and that starting at 6800-7000 you get
horrible
> > spark flutter and the unit just isn't reliable anymore.    IF this
sounds
> correct what
> > kind of aftermarket units would interface with the opti-spark?
> >
> >     Thanks again for your help,
> >     Chris Bennight
> >
>
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