Re: more details sbc in place of lt1

["Andrew K. Mattei" <amattei@mindspring.com>]

Well, with a little electrical wizardry you could do a crank hub monitoring
sensor to simulate the 8 (IIRC) pulses per rev of the lo-res Opti pulse, and
then some sort of black box trickery to 'create' the high-res opti pulses
based on those lo res pulses. Essentially what the Electromotive LT1 SDI
(which is no longer available) did, right Roger? Perhaps 9 holes drilled in
the crank hub - 8 at every 45 degrees, adding one at an odd spot so that
it's "keyed", with a small magnet inside each hole, and a hall effect sensor
mounted to the timing chain cover to detect them as they go by...

Much simpler to do on paper than in the oil, grime, vibration, and noisy
electrical environment of under the hood on the front of the motor,
though...

Good luck, I've pondered the same thing (LT1 PCM on a TPI motor) at times.

-Andrew

-----Original Message-----
From: Hotrodderzzz@aol.com <Hotrodderzzz@aol.com>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: Tuesday, July 25, 2000 12:05 PM
Subject: Re: more details sbc in place of lt1


>More detail in my previous question of sbc in place of lt1:
>Car is a 1995 9C1 Caprice, no collector value, I already have a stout 406
sbc
>(Chevy High Performance article build up, Iron Eagle heads, 6" rods, KB
>pistons, stock crank)  lt1 needs rebuilding.
>I was contemplating using the stock 4l60e and pcm, maf, wiring, etc. (with
>mini-ram) thinking that the only input missing would be the optispark
signal
>(a regular hei distributer fits with a little trimming of the base, and I
was
>planning on using a stock computer distributor or a crank fired msd or
>similar setup) but I confess that at this time i do not know if the tps and
>other sensors are the same.  Brackets and cables I can handle, I was hoping
>to use the stock pcm with lt1 edit for the computer.
>Thanks again for input and any additional input on this matter.  SKip
>
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