So, Dominick...A verdict???

[Aurora40]

Originally Posted by Paul Workman

A tuner would know, but I seem to recall reading that the exhaust pulses from the individual cylinders across the respective bank O2 can be (and are in some cases) monitored with respect to the exhaust valve timing. Thus, the mix and even the timing can be or is tweaked on individual cylinders - one of the advances allowed by the faster computers and OBD-II - one of the big advantages of the LSx over previous (OBD-I) ECM limitations. This could make position of the O2 on aftermarket exhausts a bit critical, if correct indexing of the cylinder is to be maintained. (I don't recall the source - been a while back.)

They certainly seem to be able to infer things like misfiring on an individual cylinder. I didn't know they also made fueling decisions on a per-cylinder basis, though.

Using a more modern controller would certainly be interesting, and perhaps could eliminate some of the difficult to find electronics. Though I wonder if it would be hard to get these newer ECMs to work with the 9-slot crank ring?

[Paul Workman]

Originally Posted by Aurora40

They certainly seem to be able to infer things like misfiring on an individual cylinder. I didn't know they also made fueling decisions on a per-cylinder basis, though.

Using a more modern controller would certainly be interesting, and perhaps could eliminate some of the difficult to find electronics. Though I wonder if it would be hard to get these newer ECMs to work with the 9-slot crank ring?

I dabbled in machine language programming once. But, in a nick of time, I saw my own insanity looming ahead and veered away from "the dark side"! But, maybe some prison inmate (with that kind of time on his/her hands) can re-write the code so a currently available ECM would be able to be substituted for the (now up to 18 year old) ECMs in our cars.

Anywayz...I find engine design and the attendant control thereof to be a fascinating topic. (Maybe that afore mentioned insanity got me anyway, and I just am not sane enough to realize it! )

P.

[XfireZ51]

Originally Posted by Paul Workman

I dabbled in machine language programming once. But, in a nick of time, I saw my own insanity looming ahead and veered away from "the dark side"! But, maybe some prison inmate (with that kind of time on his/her hands) can re-write the code so a currently available ECM would be able to be substituted for the (now up to 18 year old) ECMs in our cars.

Anywayz...I find engine design and the attendant control thereof to be a fascinating topic. (Maybe that afore mentioned insanity got me anyway, and I just am not sane enough to realize it! )

P.

You'd be surprised what some people are doing with older ECMs and their own source code. This is the ECM (www.dynamicefi.com) I was using on my 84 with a VAFPR for Dynamic Pressure Control.
In the case of TBI, it allowed me to increase FP and therefore fuel flow across the rpm range while maintaining an optimum PW for each area of operation like idle, part throttle, WOT. FP would range from 10-20psi using an Aeromotive 13301 regulator. There was a 2D table for BPC x VAC. In the case of the PFI motors, the VAFPR is used to maintain a constant FP across the engine operating ranges at the injector since they operate in manifold vacuum.
I WISH I could use the EBL for the ZR-1. The tuning tools and flexibility in the parameters were awesome for an ~ $300 package.

As for the LS stuff, I haven't seen anything to suggest that there is an individual VE table for each cylinder. In some definitions for LT motors for example, there exists a way of addressing the "split blm" issue we see in our motors allowing you to "trim" each bank.

[Paul Workman]

Well, now my curiosity is piqued. I remember reading about individual cylinder management about 3 years back, in an article on the LSx. I specifically remember the discussion on how the single O2 is used to monitor the individual oxygen levels of each cylinder on it's respective bank.

I'll see if I didn't save it somewhere. But, in the mean time, I'll drop a line in the CF C5/C6 forums and see what comes back. Stay tuned.

P.