Went to the track Monday and put down some 10.60's n/a but was breaking up slightly on the big end going through the traps at 7300 (with opti). What other systems are out there? Does the Delteq or any other system support big RPM? What are you fast guys using who turn big RPM?

 

belt driven distributor like the S/S cars
i believe the Delteq and LTCC are more then capable of of 7000+

 

If running aftermarket EFI & bank to bank, you can just use a hall effect crank trigger and leave the rotor in the opti. Don't know what you're running for EFI, but that might be another option.

-Mindgame

 

The factory pcm has one real limit and that is controling ignition beyond 7200, the opti is probably not your problem if you still have a GM pcm.

 

Yes the car still has the factory PCM. Noticed the breakup in the mid-upper 6k range though too, not just at 7200-7300.

Mindgame - Do you recommend any particular aftermarket (affordable) engine management? Would a Gen6 take care of this problem? Im sure I could find one for under $600 so that might be the best solution. Does the Gen 6 have recording capabilities like the FAST system? I am familiar with FAST but not the Accel DFI.

 

Ttt

 

The Gen 6 DFI can record up to 6 functions at a time, as well as real time monitoring on a laptop. It uses a low res signal from the opti, so I guess it would work with a crank trigger.

It would be nice to get rid of the opti all together, the caps like to cross fire when they go bad. I have been thinking about just drilling a hole in the back of the intake and installing a distributor. I could get a new MSD for the price of the cap and opti.

And my 68 has a "normal" firewall, unlike the 4th gens!

 

Its not your opti ..its your factory puter.....I turn 7600+ on a factory opti w/ no issues w/ engine management ofcourse...

 

I'm running a distributor,Crank Trigger, and fast. Got rid of the opti all together although, I never had a problem with it.

Neal

 

The Opti is not a problem when you use it simply for getting the cam position signal from the low res pulse. I've seen them support up to 8,000rpm feeding MoTeC aftermarket systems. Add the capability to run 8 direct fire coils, and an aftermarket ECU becomes desirable for engines running over 7,000rpm.

 

I know the coil packs are all the rage now, but it would also work using the low res signal from the opti, and a rear mount old style distributor, correct?

 

"All the rage now...." ??? Several of us got into this up to 6 years ago, and Baxter's 9.04-second LT1 used the low-res/MoTeC/LS1 coil setup when he ran those times about 3 years ago.

Not sure what your question is... if you have an "old style" distributor, what are you using the low res signal for, except possibly to keep the "sequential" part of SFI.

 

Edit: Turns out 7200rpm actually acts like a rev limiter of sorts. At least with the 8051 PCM. So I guess I was wrong about that.

I fear for your opti rotor. It's not long for this world (unless you already got rid of it).

 

I believe he is referring to the the LTCC and Delteq systems that have recently become available to the less hardcore crowd.

Ryan

 

4 years and counting,8000 rpm pretty regular.The one I replaced then,there was nothing wrong with it....call me a rebel ..but then again as I said its a 94' opti ..the 95' up are the ones I see coming apart...