RPM limits of GM computer/ignition module?

[Programmer]

The MSD 6 series interfaces with no problems.

Lyndon.
----- Original Message -----
From: Christopher Bennight <Christopher_Bennight at baylor.edu>
To: <gmecm at diy-efi.org>
Sent: Thursday, February 22, 2001 9:20 AM
Subject: RPM limits of GM computer/ignition module?


>
>     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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