Need hypertech/efi cant do

[JST]

How do you set the speed on this truck,I have reset the ECM/TCM no help,he has 285/75/16 and is 5 mph off ? Have EFI ?
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[tokymon]

messure the accual tire size (height) and enter that
285 should equall about 33 but have seen some as low as 31.5 inch tall

[JST]

Put in 37" still 5 mph off ?

[Taz]

How do you set the speed on this truck,I have reset the ECM/TCM no help,he has 285/75/16 and is 5 mph off ? Have EFI ?

The speedometer is 5 MPH off at what speed - 50 , 100, etc. ? Speedometer error is a percentage not a constant.

Post the original (not modified) ECM and TCM tunes, as well the tire manufacturer and model line (i.e. Goodyear manufacturer - RSA model tire - etc.) for the 285/75-16 tires.

Myself or another Forum member will take a look at it for you ..


Regards,
Taz

[JST]

5 mph at 70 and 3 mph at 35

[JST]

13614 13615 Had 245/75/16 and now 285/75/16

[Taz]

The ECM tune you posted has had the Speedometer parameters altered - need an unaltered stock version. Also need the tire manufacturer and model for the new 285/75-16 tires - to then look up precise tire data. Once I have these pieces to the puzzle, I will try and help out.

Getting late here - probably won't check the Forum again until Monday.


Regards,
Taz

[JST]

BFG tires,I have tuned 126 trucks to date and set the speedo on 80 % of the trucks,I check it with my GPS after setting it,if you look on the forums a lot of trucks can not get the speedo set with EFI (newer gas trucks) I did reset the H0136 from 370 to 333 no help,2 gas trucks in the area had a tech 2 set it after thay gave up with EFI.

[Rhino79]

Try these.

[JST]

Try these.

Thank you,let you know