 What would cause a speedo to read high?, Reads 90 when I'm really going 65 |
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| matthepcat |
  Apr 21 2016, 09:05 AM
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#1
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Meat Popsicle  Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California  |
Like the title of this thread states, what would cause my speedometer to read a higher speed than I am traveling?
Is this a mechanical issue with the factory gauge? (IMG:style_emoticons/default/idea.gif) |
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| Jeffs9146 |
Apr 21 2016, 09:08 AM
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#2
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Ski Bum Group: Members Posts: 4,062 Joined: 10-January 03 From: Discovery Bay, Ca Member No.: 128 |
Smaller diameter than stock tires.
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| matthepcat |
Apr 21 2016, 12:16 PM
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#3
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
QUOTE(Jeffs9146 @ Apr 21 2016, 08:08 AM)  Smaller diameter than stock tires. Duh! For some reason my mind was thinking that the speed was collected at the transmission and is somehow decoupled from the wheel/tire diameter. (IMG:style_emoticons/default/whack_3.gif) (IMG:style_emoticons/default/hitfan[1].gif) Dumb question of the week complete. Yes my new to me car is slammed and running low profile tires. Works well for the rotary motor. (IMG:http://www.914world.com/bbs2/uploads_offsite/s31.postimg.org-11125-1461262698.1.jpg) ^^ First project is to remove the BUBs ^^ |
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Posts in this topic
matthepcat What would cause a speedo to read high? Apr 21 2016, 09:05 AM
tomrev
Smaller diameter than stock tires.
REALLY small... Apr 21 2016, 09:34 AM era vulgaris Wow, that is off by quite a bit. Mine reads about... Apr 21 2016, 10:55 AM
914itis
Wow, that is off by quite a bit. Mine reads abou... Apr 21 2016, 08:54 PM AZ914 That is quite a bit of difference. You can go to ... Apr 21 2016, 01:37 PM toolguy That is a 50% error, You'd have to have someth... Apr 21 2016, 02:01 PM porschetub Only real solution is to have the speedo regeared ... Apr 21 2016, 02:09 PM 914Sixer Weight probably came off in the speedometer. Apr 21 2016, 04:06 PM matthepcat They are 15" rims. I believe 195/50/15...mayb... Apr 21 2016, 04:55 PM struckn Mine reads about 10MPH faster then actual speed. I... Apr 21 2016, 08:25 PM PancakePorsche Have Palo Alto or North Hollywood speedometer cali... Apr 21 2016, 09:45 PM |
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