ClubCalibra | Speedo problem
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Offline calibra_steve

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Speedo problem
« on: September 08, 2010, 18:18:35 PM »
Hi just a little bit of help please... Atm i have 15s on my cali tire size is 195 55 15 and when im driving along my speedo is reading 40 when go actually doing 30 (tested with sat nav and a mate side by side) just woundering if anyone had a clue whats wrong i do have some 17s going on soon but if its out with 15s on whats it gonna be like with 17s?
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Bovva

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Re: Speedo problem
« Reply #1 on: September 08, 2010, 18:39:50 PM »
you should have 195/65/15 tyres on it I think.
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Offline calibra_steve

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Re: Speedo problem
« Reply #2 on: September 08, 2010, 20:11:25 PM »
Im sure i read a post somewhere saying its 55 but aint sure lol.... Whats best for 17s then?
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Bovva

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Re: Speedo problem
« Reply #3 on: September 08, 2010, 21:22:21 PM »
Quote from: calibra_steve on September 08, 2010, 20:11:25 PM
Im sure i read a post somewhere saying its 55 but aint sure lol.... Whats best for 17s then?

205/40/17 is the best size for 17's.

I can't remember what size the cally 15" wheels had, I may be thinking of my current car which has the 195/65/15's on it :-\
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Offline calibra_steve

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Re: Speedo problem
« Reply #4 on: September 09, 2010, 07:12:54 AM »
Cheers i still dont get y the speedo is saying im doing 10mph more than i actually am lol
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Offline chrisw

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Re: Speedo problem
« Reply #5 on: September 09, 2010, 07:24:29 AM »
Well if you're registering 40 at 30 with 195/55 's on  and if they should be 195/65's  then to register 40 is a bit high still. You should be registering something like 32 maybe 33 not 40 (if speedo was 100% accurate), however speedo's will usually over-read by upto 10% (ish) so you could expect to see a max registered speed of up to 36mph on the speedo.

Use the below liink to show what effect changing tyre from OE size will make to your speed at 30 and 60mph (bear in mind speeds are actual speed an not what could be expected on your speedo)

http://www.kouki.co.uk/utilities/visual-tyre-size-calculator
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Offline DanSE4

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Re: Speedo problem
« Reply #6 on: September 09, 2010, 08:06:17 AM »
Quote from: chrisw on September 09, 2010, 07:24:29 AM
Use the below liink to show what effect changing tyre from OE size will make to your speed at 30 and 60mph (bear in mind speeds are actual speed an not what could be expected on your speedo)

http://www.kouki.co.uk/utilities/visual-tyre-size-calculator


Good link. :)
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Offline calibra_steve

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Re: Speedo problem
« Reply #7 on: September 09, 2010, 09:18:42 AM »
Will check the link when i get on my computer lol....
 
However if 40 is still high whats wrong lol... I no speedo's aint normally spot on but this is the only time iv ever had this problem never had it on my last cali....
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Offline slysi16v

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Re: Speedo problem
« Reply #8 on: September 09, 2010, 12:28:44 PM »
Is the gearbox the original unit? possible that if its had a second hand unit fitted from, say, an astra it may affect the reading due to different gear ratios. You could compare engine rpm at a set speed/gear with your mate to see if there's a difference. Does anyone have rpm/speed figures?
Or I may be talking horse sh*t. :P
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Offline DanSE4

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Re: Speedo problem
« Reply #9 on: September 09, 2010, 12:35:52 PM »
Quote from: slysi16v on September 09, 2010, 12:28:44 PM
Or I may be talking horse sh*t. :P

 ;D

Off topic sly, can you get up to Wilbury MOT & Test centre in Hitchin for me & find out why the f*ck they've had my car for re-test since 8:30 this morning? :-\

Cheers dude! :)
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Offline slysi16v

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Re: Speedo problem
« Reply #10 on: September 09, 2010, 12:40:46 PM »
Quote from: DanSE4 on September 09, 2010, 12:35:52 PM
;D

Off topic sly, can you get up to Wilbury MOT & Test centre in Hitchin for me & find out why the f*ck they've had my car for re-test since 8:30 this morning? :-\

Cheers dude! :)

Re-Test?? you mean it failed :o
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Offline DanSE4

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Re: Speedo problem
« Reply #11 on: September 09, 2010, 12:43:01 PM »
Quote from: slysi16v on September 09, 2010, 12:40:46 PM
Re-Test?? you mean it failed :o

My Veccy. Failed on a cracked windscreen & rear indicator bulbs (the orange paint had flaked off). Now how on earth can it take the tester 5+ effing hours to figure that they've been sorted! ::)
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Offline slysi16v

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Re: Speedo problem
« Reply #12 on: September 09, 2010, 12:52:04 PM »
^^^ f*ck knows, just glad they don't work here. Got enough freeloaders as it is.

And still reckon it may be the gearbox, just to keep vaguely on topic  ;D ;D
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Offline DanSE4

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Re: Speedo problem
« Reply #13 on: September 09, 2010, 12:53:08 PM »
Quote from: slysi16v on September 09, 2010, 12:52:04 PM
And still reckon it may be the gearbox, just to keep vaguely on topic  ;D ;D

I've had my rant of the day, thread hi-jack officially over! ;D
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Offline calibra_steve

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Re: Speedo problem
« Reply #14 on: September 09, 2010, 13:00:30 PM »
I aint got a clue about the gearbox tbh the guy befor aint said anything.... I dont even no what gearbox is in the car lol how can you tell? Pmsl
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Online Gav

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Re: Speedo problem
« Reply #15 on: September 09, 2010, 17:30:25 PM »
Quote from: calibra_steve on September 09, 2010, 13:00:30 PM
I aint got a clue about the gearbox tbh the guy befor aint said anything.... I dont even no what gearbox is in the car lol how can you tell? Pmsl

Have the clocks been changed? Some start at 0mph and some at 10mph. Or have you got aftermarket dials such as Lockwood/plasma fitted that may not be the right ones? Long shot maybe.

I'm running 205/55/R15's on standard alloys. My speedo reads spot on with GPS.
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Offline slysi16v

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Re: Speedo problem
« Reply #16 on: September 10, 2010, 20:18:05 PM »
DanBastardisedHybridCali bra..... Got the veccy back yet or have they gone on a jolly to sarf-end in it (not innit but in it)? ;D
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Bovva

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Re: Speedo problem
« Reply #17 on: September 10, 2010, 20:22:15 PM »
Quote from: slysi16v on September 10, 2010, 20:18:05 PM
DanBastardisedHybridCalibra..... Got the veccy back yet or have they gone on a jolly to sarf-end in it (not innit but in it)? ;D

It's saaf-end you w*nker! ;D
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Offline DanSE4

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Re: Speedo problem
« Reply #18 on: September 10, 2010, 20:36:39 PM »
Quote from: slysi16v on September 10, 2010, 20:18:05 PM
DanBastardisedHybridCalibra..... Got the veccy back yet or have they gone on a jolly to sarf-end in it (not innit but in it)? ;D

Yeah, all done. Was only the GLS Veccy though, not the GSi. ;)
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Offline calibra_steve

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Re: Speedo problem
« Reply #19 on: September 10, 2010, 20:39:24 PM »
They are the 10-140mph clocks dunno whats they normally come with think they have been changed as they are yellow lol
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