Problems with running a carb and opti

LJ93Z28GM · 07-07-2002, 05:32 AM

Looking for some info on the problems that will be had when running a carb on a LT1 with the opti as ignition.

I am still a bit vague as to where the opti gets its signal from. My car is 93 so there should be some less problems at hand then a MAF car but what am i looking at.

Do i need to fool the car so that it believes the opti is still there. I want to run a carb but without a conventional distributer on the rear of the intake. What other alternatives do i have without putting a aftermarket setup that is costly?

Vince · 07-07-2002, 11:50 AM

I think the only way to get it to work is with a crank trigger. Why keep the opti? I am curious? A billet distributor is cheaper then an opti-spark.

Vince

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95 Z28 383 LT1 roller motor. 9.93 @ 135 NA. Nitrious passes coming soon.

LJ93Z28GM · 07-07-2002, 03:38 PM

Already have a few brand new opti's and to drop the distributer i will have to pull the engine likely or drop the k-member a bit to get the engine low enough. Car is already complete and running with a setup i want but i want to do away and experiment with the carb.

Does anyone know what the opti uses as a reference on a 93 or what do most batch systems work off of?

strokedTA · 07-09-2002, 12:05 PM

All you have to do to get a dist. in there is pull the intake.
There is no logical reason to keep that POS on the car.

You can use a crank trigger set-up OR a front mount dist (but they are costlier).

FWIW: Vince has a carb and billet dist. on his LT1 95 Camaro.
I have a crank trigger in my 93 TA.

Good luck and welcome to the outlaws of the 4th gens. LOL
Dave Brown

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If a little's good,
More is better,
And too much is just right!!!

Luna · 07-09-2002, 01:18 PM

Quote:

<font face="Verdana, Arial" size="2">Originally posted by LJ93Z28GM:
[b]I am still a bit vague as to where the opti gets its signal from. My car is 93 so there should be some less problems at hand then a MAF car but what am i looking at.
</font>

The opti is the *originator* of the signal for ignition and fuel delivery. It lets the computer know where in the 4 stroke cycle the engine is. It is basically the heart beat of the LT1s EFI/IGN system

The optispark consists of a camshft postition sensor and a distributor (cap/rotor).

You should be able to run with the carb and not worry about the FI harness being plugged in. Personally, I'd just run a regular ole 350 SB/ZZ4 if a carbed engine were my taste.