Is the revlimiter in the 730ecm usable? I know its cut the fuel at a given point then resume the fuel. How is that compared to a revlimiter that cuts the spark, whats "best"? I whas going to get me a msd 6al, 90% to get the revlimiter funktion. But if you can verify that the function of the 8D code revlimiter is useable why not use that?

Thanks

 

yes, the rev limiter does work in the 730 8D AUJP.
i have a bin for valet mode with RPM fuel cut set to come in at 1400 RPM, fuel comes back at 1200.

i think cutting fuel is much better than cutting spark.
when you cut spark, your still getting fuel in to the cylinders, that fuel is then going to go into the exhaust, a nice setup for a backfire when spark comes back, which is something i don't much care to have happen with a full exhaust system, with open exhaust i wouldn't worry about it.

 

I do have to say it comes in rather abruptly when used at lower speeds like that. I do the same thing when someone else drives the car but it can cause stalls when you try to jump on it. Caught myself a couple times pulling out into traffic only to crap my pants when it stopped.
I have mine set for 6400 RPM just in case I forget to lift my foot or shift.
I'm not sure which is really better. Cutting fuel at the high RPM end and going lean could cause issues. Cutting spark can wash the cylinser walls.
I didn't get the AL, just the 6A and wish I would have at the time.
IMO, I would rather have both.

 

I disable the fuel cutoff in the $8D bins. If you run a power-adder the worst thing you can do is cut fuel. I set mine so that it pulls a bunch of timing at over-rev conditions.

 

How did you do that m8 ?

 

Change the upper most part of the Extended Spark Tables to a very low value. I assume he's using the S-AUJP bin as the stock AUJP Extended Spark Table only goes to 5,600 rpm while the S-AUJP goest to 6,400 rpm.

 

Tested the revlimiter yeserday. I noticed it can stall the engine time to time. Its not the most smooth revlimiter I tested. Think I will use the 8D revlimiter more as a "safety swith". Then get the 6AL to do the job. Thanks for the help m8s

 

Yes, the $8D rev limiter is a pretty rough ride. The A9L works well for me, although I've been thinking of adding a two-step ;^). I run a 6800 pill and bump it more than I thought I would.

 

Yes, the two-step or soft-touch rev limiters are the way to go. First pull some timing, then if the r's keep rising kill the fuel.

Don't need to pull much timing either. The power drop is easy to notice. I look at a fuel cut rev-limiter as a engine saving device. Such as would happen on drive train breakage or excess tire slip.

RBob.

 

Or a missed downshift on the highway ( dont ask.. ) .

 

i like the ideal about pulling timing out
then use the fuel cut 1~200 RPM higher for those missed gears.

 

I thought that the S-AUJP version 3 extends the VE table, but does it also extend the spark table? Is there a new version or a patch for this?

I like the idea of using reduced timing as a rev limiter, but if the spark table only goes to 5600, I'm guessing that's too low for a lot of folks. I could change the spark values at 5600 in the table, but wouldn't the ecm start "interpolating" and actually start reducing timing at 5200 (the next highest row in the table)?