Speedo Correction Options

[dhcomp]

Ok, 94 k1500 blazer, 350, 4l60e....etc

Stock tire size is 265/75R16's, and im thinking about stepping up to a 33/12.50

I knwo the speedo is only off slightly, but what are my options for correcting it?

 

[jac6695]

First, a link for some DRAC information for you:
ftp://ftp.diy-efi.org/uploads/DRAC2.pdf

Here is a how-to on modifying the DRAC for making corrections:
http://www.tbichips.com/drac/

A calculator:
http://www.philter.com/cgi-bin/drac.pl

One of these days I will use all of this information and correct the speedo in my truck.

 

[daleearnhardt01]

First, a link for some DRAC information for you:
ftp://ftp.diy-efi.org/uploads/DRAC2.pdf

Here is a how-to on modifying the DRAC for making corrections:
http://www.tbichips.com/drac/

A calculator:
http://www.philter.com/cgi-bin/drac.pl

One of these days I will use all of this information and correct the speedo in my truck.

Well the day you do yours, we can do mine as well...

 

[sweetk30]

http://cgi.ebay.com/ebaymotors/Superlift-Speedometer-Recalibrator-Chevy-Trucks-89-95_W0QQcmdZViewItemQQcategoryZ33598QQitemZ7982389618

found this also.

 

[dhcomp]

ooo, the looks like a good deal.

Is that one that can be adjusted, or one that is set to recal to just one size? It seems to be just one size, but then again, its only $20. I may have to order one of those....

THanks!

 

[jac6695]

Well the day you do yours, we can do mine as well...

Now Chris, you should know me by now. It's on the list.

Besides, your truck will need one of the Superlift TrueSpeed corrector device thingy, or reprogram the PCM (for example, ask for a Westers flash for your next B-Day). Only the TBI trucks and the 6.5's use the VSS buffer in the dash.

 

[jac6695]

Looks like a good deal if you think you will stay with one size tire.

 

[daleearnhardt01]

Now Chris, you should know me by now. It's on the list.

Besides, your truck will need one of the Superlift TrueSpeed corrector device thingy, or reprogram the PCM (for example, ask for a Westers flash for your next B-Day). Only the TBI trucks and the 6.5's use the VSS buffer in the dash.

Hahahaha

Yeah a Wester's Tune wold be a marvelous gift... But if I get a tune I might as well get headers, cam, blah blah blah... right?

 

[chevyk2500hd]

I am trying to work on my VSSB for my 95 chevy truck with a 4L80E. I have heard that my pulses per rev is 31 not 40. Can anyone confirm this?