Replacement Speedo Out by 20kmph

[Guest]

So I bought a new addition to my project car a 240km speed. It was apparently from a grand wagon auto with the only difference being i had to swap over one central plug to get it to hook up to my GTB 1996 loom.

Everything is sweet and all works a treat except the speedo reads 20km more that actual travel speed... Used my GPS phone to test speed also was getting overtaken by mopeds so knew I wasn't going 50kmph.

I checked in with an instruments specialist and he said that a recalibration would be $300+.

So is there any other options or advice as I like my new speedo and don't want to revert back to JDM 180km?

[DRFVDR]

Keltic brought a kit from Jaycar that would do this...

try them

[petrolheadjman]

yea spark_38 was selling one a while back

[gotasuby]

its out cause grand wagons have bigger wheels and calibrated for that

[Guest]

link to the kit

http://www.jaycar.co.nz/productResults.asp?keywords=Speedo+Corrector+MkII+Kit+&keyform=KEYWORD

-smurff

[Guest]

 gotasuby said:

its out cause grand wagons have bigger wheels and calibrated for that

Your telling me that my 17" wheels are so much smaller that it cause a error of 20Kph? Must be some Big Wheels on them Grand Wagons. lol

[Guest]

I have just Had a look at the Jaycar speedo corrector. Looks like the a great solution Cheers for the help!!!

[99GTB]

Put a speed input into your link g4 and get it to output the right speed to dash?

[Guest]

My Rex is out by 20km. Ull get used to it

[Guest]

 99GTB said:

Put a speed input into your link g4 and get it to output the right speed to dash?

G4 out put only controls the tachometer in my case

[subieboy]

 ShaylaJ said:

My Rex is out by 20km. Ull get used to it

Untill they discover it come WOF time

[Guest vf20/21bg5]

 macatacka']

[quote name='99GTB said:

Put a speed input into your link g4 and get it to output the right speed to dash?

/quote]

G4 out put only controls the tachometer in my case

so my g4 storm will correct this for me? as mines out 10km....how would it be done?

[Guest]

 subieboy']

[quote name='ShaylaJ said:

My Rex is out by 20km. Ull get used to it

/quote]

Untill they discover it come WOF time

Passed my wof at the AA just fine, sir.

[DRFVDR]

 ShaylaJ']

[quote name='ShaylaJ said:

My Rex is out by 20km. Ull get used to it

/quote]

Untill they discover it come WOF time

Passed my wof at the AA just fine, sir.

they obviously didnt notice it was out some time some one will then it will fail... you are only allowed a 10% variance

[Guest vf20/21bg5]

so 10ks out is ok then,cool

[Guest]

Won't worry till that happens. Chur

[subieboy]

 DRFVDR']

[quote name='ShaylaJ said:

My Rex is out by 20km. Ull get used to it

/quote]

Untill they discover it come WOF time

Passed my wof at the AA just fine, sir.

they obviously didnt notice it was out some time some one will then it will fail... you are only allowed a 10% variance

Yep agreed.

The speedo / odo is only allowed to over read by 10% maximum (i.e. shows 100Km/h but actual is 90Km/h). This is a requirement for manufacturers and over the lifetime of the car...

It can become a issue during crash investigations if the speedo is incorrect especially with fatalities involved...

And is a perfect loophole for insurers to claim your car wasn't upto WOF standard... Your effectively not covered if they discover that...

[BLAZD]

sell me the speedo

[Guest]

Mines out by just over 7km when going 50km. Just gets bigger the faster I go..180 is down by my odometer...

[B_Man]

 macatacka']

[quote name='gotasuby said:

its out cause grand wagons have bigger wheels and calibrated for that

/quote]

Your telling me that my 17" wheels are so much smaller that it cause a error of 20Kph? Must be some Big Wheels on them Grand Wagons. lol

40mm Diameter difference

[nickch]

For those with standard speedos, I read somewhere that its normal for them to read faster than your actual speed.

Its hard to get instruments to be too accurate, and over-reading your speed is safer for both the driver and manufacturer (legally).

[luvmaforzzy]

the size of your wheels play a big part too, I put 225/40 r17 on my forester not knowing what diffrence it would make then got told thats the reason for speedo being out by 10 kms so now im riding on 225/55 r17's, an speedos close but not perfect, out by 2kms