07 California Special Gt

Tagger

New Member

May 22, 2015

10

1

1

Aug 12, 2015

#1

• Aug 12, 2015

• #1

The speedometer is off 4mph. It was 8mph and they put a new instrument cluster in it and it made it only 4mph.

Any ideas?

And this has a pro charger super charger on it.

It was all bolt on.

The only chip that was installed was a ford racing package and it looks like someone tuned the MAF sensor.

 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Admin Dude

Jan 4, 1985

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Box behind Walmart

Aug 14, 2015

#2

• Aug 14, 2015

• #2

Well... It's not the super charger that's throwing off your speedo.

It is very unlikely that your MAF was 'tuned'.

How worn out are your tires? You didn't indicate whether it was 4mph high or 4mph low.

 

C

cmann

Member

Nov 26, 2014

38

6

18

Aug 14, 2015

#3

• Aug 14, 2015

• #3

Do you have the hand held tuner that would have been needed to change from the stock tune to a custom tune to work with the ProCharger?

 

Tagger

New Member

May 22, 2015

10

1

1

Sep 17, 2015

#4

• Sep 17, 2015

• #4

I think they ran a custom tuner but Ford said all they did was the Ford Racing Tuner Package.

Tires are basically brand new.

It's roughly 5-7 mph under. :/