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displaying posts 1 to 5 of 5
| Author | Subject: Speedo drive gear - change to correct speedo when fitting 195/50 |
 6speedmanual
Newbie  Location: Northampton Registered: 01 Aug 2010 Posts: 23 Status: Offline |
Post #1
HiHas anyone tried to make a speedo correction by changing the drive gera to a different number of teeth? eg going from 19 to 20 teeth will slow down the speedometer by 19-20 / 20 x100 = 5% Seeing as pug speedos over read anyway and fitting 50 profile tyres makes it worse, this could be a good mod. The question is, which Pug has the right drive gears??????????????????????????????????????????????? Peter |
 Posted 22nd Oct 2013 at 20:11
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Rich E
Forum Admin Location: Hertfordshire Registered: 27 Apr 2005 Posts: 7,757 Status: Offline |
Post #2
Remember you'd also need to change the gear inside the speedometer drive housing that is driven off the diff. The size and offset of the teeth need to match on both of the gears.The number of teeth on its own is only part of the answer. ________________________________________ Rich |
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Posted 22nd Oct 2013 at 20:25
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pooouk
Regular Location: Belper, Nr Derby Registered: 22 Jun 2009 Posts: 259 Status: Offline |
Post #3
I like them to over read.. a good safety margin for the speed cameras!!Nick ________________________________________ AKA nick on 205gtidrivers.com |
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Posted 24th Oct 2013 at 16:07
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6speedmanual
Newbie Location: Northampton Registered: 01 Aug 2010 Posts: 23 Status: Offline |
Post #4
Rich. I agree that the ratio is a function of both pinion and skew gear. On the Pug 106 the same skew gear was used to drive the two option pinions.Nick. Speedo on my 306 D is already reading 82 at 70 - one heck of a margin!  I'm just about to put 50s on my Rallye so considering options. Peter |
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Posted 24th Oct 2013 at 19:30
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6speedmanual
Newbie Location: Northampton Registered: 01 Aug 2010 Posts: 23 Status: Offline |
Post #5
So far by asking sellers on ebay I have found:Red 17 teeth White 20 teeth Anyone know what the standard black(?) one has? Peter |
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Posted 24th Oct 2013 at 20:10
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