Pfc Speed Reading

[PhilGTR]

My speedometer readings and the power fc speed readings are different The Pfc always reads less, the higher the speed the bigger the gap between my speedo and the pfc. Like on the freeway my speedo reads around 120km/h but on the pfc its like 109-110km/h Just wondering is the pfc accurate?

[paulr33]

from all the stuff ive seen the hand controller is usually more accurate than the dial

[fEkuaR]

mines the same not sure which is right i just drive off the speedo anyway.

[RB30-POWER]

The PowerFC is all digital, no mechanical moving parts to wear and get out of calibration like the speedo has. So it by all counts should be the correct reading. (Not to mention the japs could have put the needle on wrong when they wound the speedo back before exporting the car, )

[kasanoff]

also, when speedos are calibrated from the factory, don't they make them read slightly fast anyways?

[RB30-POWER]

cops use to go off 10% leway with radars because of the manufacturing requirements were around 10%, but now the car makers need to have them like no lower then actual speed but up to 7% over or some crap like that.

can't recall the exact adr requirements that pertains to new cars, but its changed a fair bit.

[NYTSKY]

Mine is the same but i put it down to running on 17s.

[boss33]

mine always does it to but id bleave pfc bfor speedo

[PhilGTR]

thanks peeps!

[BAMR33]

Both of them are probably off. Have got larger than factory wheels on as this can through the reading.