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Speedo Out 

 

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 Post subject: Speedo Out
Posted: Thu May 05, 2005 10:19 pm 
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i was going down the freeway today and my girlfriend was following me in her car and said i was doing 110KM/H all the way when i was sticking to the speed limit 100KM/H

Has anyone had problems with there speedo being out after lowering and putting 17's on?

 

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Posted: Thu May 05, 2005 10:24 pm 
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is the rolling diammeter of the tire the same as normal?

if its not, theres ya problem
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Posted: Thu May 05, 2005 10:29 pm 
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When you change wheels you need to insure you maintain the same rolling diameter,

Have a look at this site http://www.miata.net/garage/tirecalc.html

Put in your old standard wheel size, and your new wheel size. It will calculate the speedo error and tell you if you have the worng size tyres

 

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 Post subject: Re: Speedo Out
Posted: Thu May 05, 2005 11:13 pm 
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bono wrote:
i was going down the freeway today and my girlfriend was following me in her car and said i was doing 110KM/H all the way when i was sticking to the speed limit 100KM/H

Has anyone had problems with there speedo being out after lowering and putting 17's on?


Could be her speedo is +5% and yours is -5% ??? both within ADRs.

Point being, you can't rely on your or someone elses speedo.

If you've got a GPS, use that. Using my GPS I've calibrated my speedo to be accurate. It was 3KM/H slow.

 

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Posted: Thu May 05, 2005 11:30 pm 
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Another way to tell is if you are near a 110kph zone that has the speedo check signs, do 120 to make the maths simple and each K should take 30 seconds, at the 4 K mark you should have taken 2 minutes, if not then simple maths will show the actual speed you did. Don't think this works in VIC any more as you don't get the 10% leaway from the police anymore without getting a fine.
Cheers
TW.

 

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Posted: Thu May 05, 2005 11:37 pm 
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@100 1KM will take 36secs, so you won't break the law. (still pretty easy maths)
@110 1KM will take 32.7272727272 :shock:
@120 1KM will take 30secs

@bono - you have your avatar in a bigger format?

 

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Posted: Thu May 05, 2005 11:38 pm 
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cheers guys
ill check the diamerter when i get home

 

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6 IN A ROW, THE WAY TO GO


- Lukey 2.5' Sports Exhaust, Genie Extractors, High flow Cat
- 18 grade tint
- King Spring Super Lows
- Plates (BONO'S)
- Neon Blue Dash
- Sony 350W 4 ways, Sony 900W Subs x 2, Sony MP3 Deck xls-3300, Boss 1000W 4 channel Amp
- 17" HP Racing - Design Rims

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Posted: Thu May 05, 2005 11:39 pm 
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cheers guys
ill check the diamerter when i get home

if it is out can i adjust it myslef?

 

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6 IN A ROW, THE WAY TO GO


- Lukey 2.5' Sports Exhaust, Genie Extractors, High flow Cat
- 18 grade tint
- King Spring Super Lows
- Plates (BONO'S)
- Neon Blue Dash
- Sony 350W 4 ways, Sony 900W Subs x 2, Sony MP3 Deck xls-3300, Boss 1000W 4 channel Amp
- 17" HP Racing - Design Rims

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Posted: Thu May 05, 2005 11:42 pm 
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according to that site, i've gone from 205/65/15 to 235/45/17 - 0.6% of a difference 8-)

so thats more than good enough for me - if anything, its my speedo that'd be out.

 

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Posted: Thu May 05, 2005 11:53 pm 
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I think you'll find the speedos are out from the factory, the speedos usually read faster than you are really going though.

For instance my speed limiter (ment to be 180km/h) comes on at 173 according to my dyno print out.

 

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Posted: Fri May 06, 2005 2:54 am 
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Put your cluster into diagnostics mode 3 which shows RPM & KPH.

If the LCD shows you are travelling at 100KPH but the dial shows something differant, then there is a problem with your speedo dial gauge.

If they both agree, and its not tyres, could be that you have a non standard diff. Some brighter guy than me would know what diff ratios exist and if this would cause a 10KPH error @ 100KPH actual speed.

In my case, my speedo error is 3KPH lower @ 100KPH as shown by the LCD.
On my last drive up the Hume highway from Melbourne, my LCD speed matched that of the overhead radar speed check, so i know it is accurate as i wasn't in a datsun :)


Cheers.
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Posted: Fri May 06, 2005 10:20 pm 
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ItchiOne wrote:
If they both agree, and its not tyres, could be that you have a non standard diff. Some brighter guy than me would know what diff ratios exist and if this would cause a 10KPH error @ 100KPH actual speed.
Cheers.


mine is like that - with the help of the speed check signs, i found my speedo is nearly 10km/hr too slow at 100 km/hr indicated.

I suspect some bright spark changed diff ratios but hasn't adjusted the speedo. Doesn't bother me too much though, i just go a little slower, and know i've got plenty of leeway if the cops come past...
will fix if/when i get a new diff.

 

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