07 California Special Gt

Tagger

New Member
May 22, 2015
10
1
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.
 
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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.
 
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. :/