Hi guys I’ve got a 1.8 gt-2 5 speed and when driving it seems to show 5 mph slower than it’s displaying, so I found out it has a white speedo drive and when looking online it’s supposed to have a red one.
I’ve bought a circlip and a red drive but the new drive won’t stay on the end of the cable and it won’t fit with the circlip so I’m stuck.
Any suggestions would be really appreciated.
Speedo drive
Re: Speedo drive
You have to get the circ clip, in the groove first, then push the cog over it.. try a bit of grease.. soak the cog in warmish water to help it pass over the circ clip. Cold days dont help.
Still even with different drive you may find discrepancies in speedo, due to wheel and tyre ratios. See attached.
End of the day if shows 75 and your doing 70 on motorway you keep your licence. 1 of the reasons why 10% +2mph rule was there, due to mechanical measurement, now you just plug in to live OBD and can see speed,done by ECU. Depending on quality of GPS you may also find difficult to check calibration, so i guess rolling road or MOT bay.
Still even with different drive you may find discrepancies in speedo, due to wheel and tyre ratios. See attached.
End of the day if shows 75 and your doing 70 on motorway you keep your licence. 1 of the reasons why 10% +2mph rule was there, due to mechanical measurement, now you just plug in to live OBD and can see speed,done by ECU. Depending on quality of GPS you may also find difficult to check calibration, so i guess rolling road or MOT bay.
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C 20 CCO
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Re: Speedo drive
Haynes manual shows what needs to be done, if you have one. I swapped my drive gear many moons ago and managed it with no problem.
kind regards,
Dave.
To be old and wise......
You must first be young and stupid!
Previously owned: 1984 1.6 CL in alpine white; 1986 1.6 GT in met light blue over black body kit; 1990 1.8 GT2 in silver.
Currently: 1991 GT2 in Pearl green metallic.
Dave.
To be old and wise......
You must first be young and stupid!
Previously owned: 1984 1.6 CL in alpine white; 1986 1.6 GT in met light blue over black body kit; 1990 1.8 GT2 in silver.
Currently: 1991 GT2 in Pearl green metallic.
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Liam86223
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Re: Speedo drive
Thank you for the advice I’ve got the circlip but when I push it on it doesn’t seem to want to go all the way it has a nipple in the middle of the circlip, unless I’ve bought the wrong one
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mark1gls
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Re: Speedo drive
Most VWs speedo over read by about 5 mph, I’ve had a 2002 vw polo over read as did a 2005 VW Touran, 3 different transporter vans all over read... I guess it’s a bit like VWs claims of fuel economy... just a little out 
Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
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GT_II
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Re: Speedo drive
This is not just a VW thIng. Speedos are allowed to over-read by up to 10%, so most are designed to over-read by around 5% to provide a safety margin. Add in a couple of % for tyre tread wear and you're over-reading by 5 mph at 70 mph.
1992 VW Scirocco GT II 1.8 90PS Brilliant Black 30k
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RussGLAuto
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Re: Speedo drive
The GL was 8 MPH over reading when I first got it. The tyres were 20 years old. Changed them for new and guess what, now back to VW 'standard' 5 MPH over reading...
Old perished rubber makes a difference...
Old perished rubber makes a difference...
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Weekend Wagon - 51k 1982 Mk2 Scirocco 1.6 GL Auto - Diamond Silver
Other Half's Wagon - 2018 Mk7.5 Golf GT TSi Auto - White
Daughters Curb Scraper - 2016 Fiat 500 1.2 - White