5400 RPM limitation with '96/'00 Vortec trucks

[n0dih]

Sure, no problem

I have a 97 and a 99 PCM and the one you gave me, let me know what you need.

Originally Posted by AJxtcman

Tom could you mail me the Black Box that I gave you or could read me out some bins?
I have some VCM connectors that I could mail you, but I don't have a spare DLC

[Ed Wright]

Originally Posted by Programmer

The VE table is hard limited to 5600 RPM...I can't see a way around it, guys--regardless of what the rev limiter is set to.
You can overshoot the rev limiter if you 'free-rev', but it won't do that under load.
In 'code', the table doesn't have room for remapping, either.
The VE starts at $376F6 and ends at the cylinder volume 16 bit constant $378E4.

I don't think that means much. The LS1 rables only go to 8000, I have LSX customers with short runner sheet metal intakes shifting above 8000. Just can't make tuning changes above that.

[Programmer]

Yeah...I think the LS1 limit is 8190 'something' RPM on spark and fuel...although some data constants can limit to 12K + RPM

I know I've burped past 5600 on some Vortec trucks in the shop on the dyno (Optical crank sensor--not from vehicle tach)...might spend more time on that again to see what's possible on the V8. Nonetheless--table data ends at 5400.

[Programmer]

Sorry fellas...
Found some new/old Vortec data here. Fixed a scaling error.
Spark table limit was 6000 RPM, ESC table limit was 6000 RPM, Found a reference to 6400 RPM with respect to PE, but the fuel table was still limited to 5600 RPM (not 5400 RPM).

The spark table is 400 rpm increments (0-6000) 16 x 19 (kpa) table

[Ed Wright]

Originally Posted by Programmer

Yeah...I think the LS1 limit is 8190 'something' RPM on spark and fuel...although some data constants can limit to 12K + RPM

I know I've burped past 5600 on some Vortec trucks in the shop on the dyno (Optical crank sensor--not from vehicle tach)...might spend more time on that again to see what's possible on the V8. Nonetheless--table data ends at 5400.

According to CalTool the LS1 limit is 12,799.9 RPM. For some reason HPTuners limits you to 8000. Not sure why that would be, Haven't looked at efilive, don't know what they limit you to. They have "soft limits" that are lower than GM's for some reason.

[Programmer]

96+ Vortec has the same 12799.80 limit in some constants...
8191.75 RPM is an LS upshift RPM limit, too...

[Ed Wright]

Originally Posted by Programmer

96+ Vortec has the same 12799.80 limit in some constants...
8191.75 RPM is an LS upshift RPM limit, too...

With the PCM's shift lag you can make them actually shift at 8300 to 8400 or more, providing it is a fast car with a lot of gear that winds up fast.

[poconojoe]

I looked in EFI Live on a 2002 Z06 tune you can set the Rev limiter to 12,800 RPM