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Speedo under-reading.
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14-11-2012, 05:58 AM
Hey guys. Ever since I have had my DTurbo the speedo has been out. I found this out by using my Sat Nav. When the Sat Nav reads 70 mph my speedo says im doing 62mph. Usually it is out the other way round and the speedo over reads.
Anyone have any ideas on why this is doing it? The difference increases when you go faster as well. 
14-11-2012, 06:20 AM
Speedos should underread rather than over read. What size tyres are you on? Does your needle rest on 0?
15-11-2012, 09:31 AM
No speedos always over read so it seems like you are going faster than you actually are. Otherwise you would be getting flashed left right and centre by speed cameras! Tyre size is 205 40 16 and my needle rests at 0.
Posts: 7,825
Threads: 465 Joined: Dec 2011 Reputation: 114 Location: Cullompton Devon Car Model/Spec: Vauxhall 
take the dash out and move the needle on the pin till it match's the satnav
 set it @70 mph 
Posts: 19,854
Threads: 581 Joined: Dec 2011 Reputation: 195 Location: Bournemouth Car Model/Spec: Supercharged 306 GTi6
15-11-2012, 10:31 AM
(15-11-2012, 09:37 AM)cully Wrote: take the dash out and move the needle on the pin till it match's the satnav (15-11-2012, 09:37 AM)cully Wrote: take the dash out and move the needle on the pin till it match's the satnav Can't. They calibrate when you plug them back in!
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft 
15-11-2012, 11:49 AM
Mine dont. I just lifted the needles off and Bodged them back on. They sit bang on 70mph now.
![[Image: signature_zps1a02ba79.jpg]](http://s1128.photobucket.com/user/martypellowe/media/signature_zps1a02ba79.jpg.html) 
Posts: 6,367
Threads: 87 Joined: Dec 2011 Reputation: 48 Location: South Yorks. Car Model/Spec: Rouge vallelunga 5 door Dturbo 
15-11-2012, 11:53 AM
. . . .
Phase 1 D-Turdo, K14@24 psi, De-cat, meaty backbox, Bosch pump, grinded LDA pin, duel air fed K&N =133.7bhp & 188ft/lbs
Posts: 19,854
Threads: 581 Joined: Dec 2011 Reputation: 195 Location: Bournemouth Car Model/Spec: Supercharged 306 GTi6
15-11-2012, 11:59 AM
(15-11-2012, 11:49 AM)cwspellowe Wrote: Mine dont. I just lifted the needles off and Bodged them back on. They sit bang on 70mph now. Both of my sets and the ones I did the plasma dials on did!
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
17-11-2012, 03:20 AM
I dont really wanna do that lol. Do you think it is worth me changing my clocks? Or could it be the speedo drive sensor on the gearbox?
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