Hello, tell me if this is considered prom begging or not, but, I need a stock prom bin for a 1991 3.1l camaro with an auto, and the accompanying definition file. I have the prom but can't get the bin off of it because I'm using an emulator instead of a burner/reader. Thanks -Scott

Asking for a stock GM BIN is OK. We always recommend a stock calibration as the best starting point.

You need the BIN AZTY which is the latest release from GM for your vehicle. Along with a maskid $88 XDF file.

There are copies of AZTY all over the 'net. Can also be found here: http://www.eecis.udel.edu/~davis/z28/index.html

For the XDF, check Mark's Tuner Pro site first. Otherwise there should be one on diy-efi.org

RBob.

Thanks, I didn't know about the site where the prom was. I had no Idea the VE was so low on these engines.

The $88 mask uses a VE adder table setup. Need to add together the lookups from two tables for the final VE value. In the calibration there are actually three VE tables. A low speed/idle table, a normal table, and an adder table.

The adder table is only based on engine RPM.

The other two tables are based on RPM and load (MAP).

The adder table is always in use along with one of the other two. Which one of the two depends upon the engine speed and throttle position.

RBob.

I also have a stock .bin if you need it (1990 3.1 MPFI SD), but I can't seem to find a defintion file for the $88...

Give me an email, and I can send it.

But why are you wanting to keep the $88?