vss tire calibration help

[curtmgulla]

have a 2007 f250 6.0l 2wd .. truck has newer 20" wheels there 275/65R20 trying to get my speedometer correct but no matter what I set the vss revs per mile to .. it does not change anything .. what am I missing?

[midevil1]

Nobody seems to know. Try calibrating for 38's...lol. I haven't figured it out either. Mine stays 5 mph slows no matter what... I am guessing that HP doesn't have all the PID's.

[RandomEnthusiast]

33 inch tire. 630 revolutions per mile. Don't know if this info will help but that's how it seems the pcm on these is setup is revolutions per mile x whatever your rear gear is.

[midevil1]

33 inch tire. 630 revolutions per mile. Don't know if this info will help but that's how it seems the pcm on these is setup is revolutions per mile x whatever your rear gear is.

I have tried revs all over the place. ECM and TCM. My truck has 3.55 ELSD diff and the tune shows 3.73's. I don't think HP has everything needed to correct VSS...

[RandomEnthusiast]

Maybe not then. I don't know.

[gilgamesh]

My 20"s show 655 revs per mile and 3.73 gear ration in HP Tuners. Don't know if this helps you or not.

[gilgamesh]

I have tried revs all over the place. ECM and TCM. My truck has 3.55 ELSD diff and the tune shows 3.73's. I don't think HP has everything needed to correct VSS...

I'm really new to HPT so sorry if this is obvious, but when you tried setting the different tire sizes did you disable VID?

[midevil1]

I'm really new to HPT so sorry if this is obvious, but when you tried setting the different tire sizes did you disable VID?

What do you mean by "vid"?

[Eric@HPTuners]

I believe the ABS module controls the speedometer on these, which we currently do not support.

[midevil1]

I believe the ABS module controls the speedometer on these, which we currently do not support.

What do you suggest? Are you going to offer support?

[Eric@HPTuners]

What do you suggest? Are you going to offer support?

I will look into it.

[midevil1]

Update one this issue?

[Shawee]

Just wondering, did you recalculate your N/V base and disable "use VID's", I did on my 04 and it worked, the tire revs do nothing.
based on the info you have gave previously i calculated your N/V base at 31.4033. hope this helps

[midevil1]

Just wondering, did you recalculate your N/V base and disable "use VID's", I did on my 04 and it worked, the tire revs do nothing.
based on the info you have gave previously i calculated your N/V base at 31.4033. hope this helps

This is not an option in my READ. I show gear ratio, VSS mins and max, And N/V base.