Stock PCM limits?
 

Anyone know for sure just how far RPM wise the stock PCM has fuel/spark tables for? I've been hearing 7500rpm, but I not 100% sure on that. It's mostly just a curiosity thing, but I do wonder how high an LS1 can rev without going with an aftermarket PCM (Motec, Holley, etc.)...

Re: Stock PCM limits?
 

The tables I am sitting here looking at stop at 8000 rpm. Now I am not saying that I have tried it, but thats how far the tables go!

Ryan <img src="gr_grin.gif" border="0">

Re: Stock PCM limits?
 

Cool... Thanks for the info Ryan. I may be buying LS1-Edit for myself soon. <img src="gr_stretch.gif" border="0">

Re: Stock PCM limits?
 

Ryan, how high can you set the shift points?

Re: Stock PCM limits?
 

the shift points are based soley off of MPH, so, you could setht the shift points at any MPH you want. For example, my 1-2 shift at WOT is currently at 34 mph (I think) and for me that equates to approximatly 6400 rpm. The 2-3 shift is set for 66 mph, approx. 6300 rpm.

Ryan <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

Re: Stock PCM limits?
 

Yeah last year with my 346ci motor it was supposed to shift at 40mph and 80 mph for 1-2 and 2-3.

Re: Stock PCM limits?
 

Wow...They give you some room to rev eh?

OBD1 LT1 tables go to like 7

And OBD2 goes to like 7200.

I hear they just keep using the values in the last table up to 7500...but that is also where the PCM stops being able to keep up. It cant sample/send signals any faster.

Re: Stock PCM limits?
 

I don't know what the table ends at, but I'd imagine the stock PCM would just use the 7500rpm cells (if that is the right number) for any rpm over 7500.