Anyone care to guess...

[XfireZ51]

Originally Posted by Hog

Actually that pictured 24x reluctor is only a few weeks old now. It uses a less expensive CKP sensor that the 96-98 Vortec trucks use. Notice its a single coded wheel, not a double wheel like the EFIConects are. Its different than the ones that were developed back in 2007. The 2007 versions are dual wheels that are coded exactly opposite, so 1 sensor must read 2 signals simutaneously. The 1999-2000 big block 454 used in the medium duty trucks was the 1st BBC to use CNP and DNW. That reluctor costs $20 from any GM dealership, get its accompanying sensor and it can be made to work. Or when getting a crank done, get a 24x signal cut instead of the 9x. There is always a crank hub mounted version, doable but optimal, maybe not.

Not sure if I understand your issue, once you go 0411 PCM, use it for your dwell control, the tables are there, gut the LT5 ignition entirely. Then set them up for your COP coils. But I must be missing something.

Good work on your project. I have blazed some EFI trails, it can be challenging, but rewarding in the end.

No you're absolutely correct. W the 411 you would use those dwell tables. I was musing about our current 9 slot reluctor on the crank, ie just use the current crank signal, ditch the ICM and do some custom code for the stock LT-5 ECM to handle dwell. Still would need something to do the firing sequence which is also a function of the current ICM.

[XfireZ51]

BTW, have you looked cutting slots into balancer itself? Would ATI do something like that?

Also, I understand some are using the ABS Sensor as a trigger.

[VetteVet]

Originally Posted by rkreigh

" Primary among them is that the MS unit does not have the capability for certain hardware control pertaining to future mods that I have planned."

do tell, please elaborate!!

Ron,

I'm looking at several mods. In order of priority, they are:

Coil on plug with elimination of the ICM (supposedly, the MS unit can handle this).

Electronic Throttle Control. The LS stuff they have now has more cross-sectional area than one of our throttle bodies even after being punched out (don't think the MS unit can handle this). This would also allow for a full implementation of the torque management that is available with these PCMs.

Mods to valve train to implement variable cam timing (don't think the MS unit can handle this). This would require moving up to a Gen IV PCM.

Dreaming about a split plenum twin electronic throttle body setup w/ one TB feeding the primary ports and one feeding the secondary ports. This would allow the benefits of the primary/secondary setup without the flow restriction of the butterflies in the secondary ports and the problematic vacuum actuated system. Also being able to control the proportion of primary/secondary airflow throughout the load range would allow for tuning of swirl throughout the range for maximum area under the torque curve.

I've got other ideas, but these are my primary goals.

Jep

[VetteVet]

Originally Posted by XfireZ51

No you're absolutely correct. W the 411 you would use those dwell tables. I was musing about our current 9 slot reluctor on the crank, ie just use the current crank signal, ditch the ICM and do some custom code for the stock LT-5 ECM to handle dwell. Still would need something to do the firing sequence which is also a function of the current ICM.

Dom,

I agree that a code rewrite would be able to handle the dwell aspect. I also agree that an external firing sequencer would be required, as the stock ECM does not have enough free digital outputs to handle the task.

Jep

[VetteVet]

Update:

I didn't end up getting the reluctor mount fabricated for me. I did it myself. I still have to get the sensor bracket done.

Pics:















Jep

[VetteVet]

Jep

[XfireZ51]

Very nice Jep. 58 tooth or 24? And there's room in front of balancer in engine bay?

[VetteVet]

Dom,

24x (for now). Once I get the sensor mount done, I can get the reluctor wheel positioned and pinned. Then I'll balance the assembly (as you can see in the photos, the reluctor wheel is very unbalanced).

Jep

[XfireZ51]

Originally Posted by VetteVet

Dom,

24x (for now). Once I get the sensor mount done, I can get the reluctor wheel positioned and pinned. Then I'll balance the assembly (as you can see in the photos, the reluctor wheel is very unbalanced).

Jep

Yeah that was a big reason they put the reluctor in the middle of the crank. I suppose having only 9 notches would make it more susceptible to error as well.
The middle is the most stable spot given the rpm they were looking for.

[-=Jeff=-]

Whatever happened to this??

and to Jep for that matter!!