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Registered
Join Date: Mar 2008
Location: Fairhaven Ma.
Posts: 437
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speedometer
hi does anybody know how to recalibrate a 930 speedometer. mine shows 80 mph but i am going 70 almost 10 mph off thanks
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Member 911 Anonymous
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What size tires do you have?
I have 17s and throws my speedo off 10MPH, per my navi
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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Registered
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several places around the country can recalibrate it for you. Just google it.
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Don Booth 87 Carrera Coupe (Current) 70 911 T Coupe 74 914 |
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zugelassener benutzer
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North Hollywood Speedo or Palo Alto speedo - I had a good experience with Palo Alto and they can re-screen your face to show 200mph for not much more.
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Team Fee '86 Carrera 3.2 Coupe blk/blk, no wing 7&9x16s BFG GForce SS 205/55 & 245/50s, SW Chip, Maxspeed catbypass, B&B, Sachs Power Clutch, Turbo mounts, oil cooler scoop, RS door panels, Momo Prototipo, Rennline fully adj gas pedal & floorboard, RS replica dead pedal, Weltmeister yellow h/l lenses, factory short shift, custom speedo 32C #7 |
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RS 73
Join Date: Jul 2008
Location: Santa Monica Mountains
Posts: 161
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And I had them rotate the face so I could see up to 90 or so before the steering wheel blocked the view. NH Spedometer are great and not that expensive.
I gave them my rear tire size and year of car and they calibrated the speed spot on. It matches my GPS and radar signs for most speed ranges....
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Dick Lague RGruppe #79 1973 RS Spec Carrera 2001 Saab 95 Aero 2003 Saab 95 Aero |
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Registered
Join Date: Apr 2003
Location: The Motor City
Posts: 306
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We do that sort of stuff all the time, we can even do new faces/LED lighting, whatever you need,at a fair price. Probably just need to spin the pointer $50.00
Mark |
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Registered
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Had good experience with North Hollywood Speedo
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81 911SC Targa 3.0 |
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Registered
Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
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There is some homework to do first.
The best re-calibration is when you supply the shop a complete set of measured data of what your existing speedometer reads at various highway speeds – say 55, 60, 65, 70 and 75 mph. Multiple measurements are best. Statically analysis offers even better precision. This is best done with a stopwatch and mile markers using a passenger as data-taker. Needles to say this is best done on a rural Interstate. You want to settle in on your tires and tire pressures. Even ambient temperature and load will slightly effect the results. When you get your re-calibrated speedometer, repeat the measurements. Best, Grady
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ANSWER PRICE LIST (as seen in someone's shop) Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 |
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Registered
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,459
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North Hollywood Speedo...
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Registered
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
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They apparently read fast from the factory (most applicable law says it can read up to 10% fast, but must NOT read slow).
Rolling diameter can vary per tire brand, even with stock sizes, which affects the accuracy. 17" wheels? Reads fast. Low profile tires? Reads fast. All of the above. Yup. Way fast. Just an option: http://www.yellr.com/
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'77 S with '78 930 power and a few other things. |
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Almost Banned Once
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You can do this yourself but it depends on how brave you are.
I modified my speedo by drilling a small hole in the side so that I could get to the adjusting screw easily. If you take the speedo apart you'll see a small variable resistor with a flat head screw attached. There are + and - symbols on the resistor. Try to picture in your mind were this screw is when reassembled and drill the hole in the side of the speedo housing. It's really not that hard to do... I could take some pictures of mine if you want. just let me know I drilled an 8mmm hole. The rubber ring that holds the speedo in place doesn't quite covers this hole... I have a little piece of gaffer tape covering the hole. I adjusted it by driving in traffic at the same speed as the surrounding cars. Noted the speed showing and then turned the adjustment screw a little bit at a time until it showed 60kms... Sounds dodgy I know but it worked. Since doing this I have never doubted the accuracy of my speedo at any speed. Wether I'm driving on the freeway at 110kms or around town at 50 and everything in between. You soon get a feel of your speed based on what the cars around you are doing.... Give it a go. You won't be disappointed. In Australia car manufacturers are required to have the speedo of their cars accurate at 60kmhs. It's one of the rules for getting their cars "compliant" to Australian design rules. |
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Registered
Join Date: Mar 2008
Location: Fairhaven Ma.
Posts: 437
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Thanks all called North Hollywood Speedo very nice to talk to. They believe i need a recalibration because it varies at different speeds.
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