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BT50 Speedo issues


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#1 Enzo

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Posted 10 May 2007 - 09:50 AM

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#2 BT-50 4x2

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Posted 18 May 2007 - 01:39 PM

Jest bought new BT-50, great ute, great performace, the list goes on BUT
SPEEDO IS OUT LOTS.
Checked by Mazda at first sevice and was told it was within specs.
Checked with GPS, 100 on speedo = 88km/h
50=43.2
60=53.4
70=64.1
Even had local cop check me with radar, yep 100 on speedo = 88km/h on radar.
On average 12.5% out. Not within ADR's.
One would think that with modern electronic speedos that thay would get it right.
this is also adding 12.5% of Kms to the odometer, and reduceing the warranty by 12.5%!!!!!!!!!!
I think that is the tyre size. If it was fitted with the same size tyre as 3l motor 235/75R15 not 215/70R15
the error would be approx 4%, that I could live with.
If anyone else has the same problem please contact me.

#3 joe 09

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Posted 11 July 2007 - 10:23 PM

drove a BT50 4x4 to and notice the same thing wounding if they a have a fix for it yet

#4 Jarrod

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Posted 12 July 2007 - 07:25 AM

Even had local cop check me with radar, yep 100 on speedo = 88km/h on radar.
On average 12.5% out. Not within ADR's.
this is also adding 12.5% of Kms to the odometer, and reduceing the warranty by 12.5%!!!!!!!!!!

If it's like the 3 MPS the car computer knows exactly what speed it's doing as proven by plugging a ScanGuage to the ODBII port. The odometer is perfect, but the needle is positioned in the wrong spot on the speedo by 'design'.

However, as you point out, 12.5% aint legal .. the 3 MPS is legal, just.

I'd take it up with Mazda.

#5 Mel

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Posted 12 July 2007 - 09:54 AM

Can I just ask why would mazda do this??
Why would you have a speedo out by 12.5%, seems strange to me.

#6 Hyjuki87

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Posted 12 July 2007 - 09:58 AM

very strange...

i wanna hear more
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#7 Mel

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Posted 12 July 2007 - 10:03 AM

I can understand bigger rims/tires etc, but 12.5% seems crazy (?).
Seems like mazda have a thing in with the police (gov) ....another REVENUE stint.

#8 Hyjuki87

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Posted 12 July 2007 - 10:08 AM

nope... it works the opposite way

if ur speedo say 100 its doin 88....

it only uses up your Km's quicker for warranty/service purposes if there is a conspiracy theory...

i thnk there must be something simple about teh 'by design' jarrod speaks of...

just would like to know
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#9 Mel

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Posted 12 July 2007 - 10:14 AM

ah sorry my bad, read it wrong (yep blonde).
wonder if our cars are out??

#10 Kijima

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Posted 12 July 2007 - 10:22 AM

I cant help but think it may be because of a tyre issue. You havent had different tyres fitted? Maybe they were fitted by the dealer. That would throw out the rolling diameter, which would inturn throw out the speedo not being correct. Just a thought.
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#11 Hyjuki87

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Posted 12 July 2007 - 11:11 AM

yeah he speaks of 8.5% due to tyre difference (which is nuts)...

the remaining 4% is fair and reasonable i think... in fact i would like it... i sit RIGHT SMACK SPOT ON the speed limit when there may be cameras... and 6kms over when there may be a cop around... and 10 or 11 when im being careful... and of course i never speed more than that.... ever

so 4% woudl possibly be helpful...

its like people who set their clocks 10 minutes fast so they are never late... (i know, how can u con yourself, but it does work... it takes a week or two, but it works... apparently) I know someone who turned his gf's clock 7 minutes fast on her watch the house clocks, the cra, and her work PC and it has worked a treat :P
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#12 dan

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Posted 13 July 2007 - 03:20 PM

Actually, if the speedo is 12.5% out, it is within ADR spec.

The ADR was changed in Jul 2006 and now reads that the actual vehicle speeo has to be less than the displayed reading. This is by 10% + 4kn/h, so that actually can be up to 14% before it is out of ADR spec.

Sorry to get technical

dan

#13 Kijima

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Posted 13 July 2007 - 04:17 PM

Dont appologise for being technical. We love it here! :thumbsup:
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#14 joe 09

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Posted 14 July 2007 - 09:14 PM

dan do you think mazda will ever come up with fix for this. how offen do they bring out upgrade to the computer for the bt50 and i read that Bt-50 sdx owner's get then automatically do at services

#15 MWG-87

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Posted 06 October 2007 - 10:56 AM

Jest bought new BT-50, great ute, great performace, the list goes on BUT
SPEEDO IS OUT LOTS.
Checked by Mazda at first sevice and was told it was within specs.
Checked with GPS, 100 on speedo = 88km/h
50=43.2
60=53.4
70=64.1
Even had local cop check me with radar, yep 100 on speedo = 88km/h on radar.
On average 12.5% out. Not within ADR's.
One would think that with modern electronic speedos that thay would get it right.
this is also adding 12.5% of Kms to the odometer, and reduceing the warranty by 12.5%!!!!!!!!!!
I think that is the tyre size. If it was fitted with the same size tyre as 3l motor 235/75R15 not 215/70R15
the error would be approx 4%, that I could live with.
If anyone else has the same problem please contact me.


hi there,

i have a BT50 SDX twin cab, and its the same on mine.

on my GPS the Speed hovers around 89-90km/h where as my speedometer is actually doing 105km/h etc..

it doesnt really fuss me too much, just you have to learnt o drive the vehicle around these speed limits. ( even though it shouldnt be done in the first place)

cheers

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#16 tigamica350

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Posted 06 October 2007 - 04:47 PM

Yep my MPS3 is the same and it gives me the sh*&s big time, my 6 was the same and the way i got it closer to the mark was when it needed new tyres i got a slightly taller tyre with a bigger overall diameter, my neighbor is the same with his six and he's not happy either. When it's time to get rid of it, the car has actually done less klicks than indicated
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#17 silver6

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Posted 08 October 2007 - 09:44 PM

Actually the odometer is correct. Even the speed from the ECU is correct.
It's just the speedometer that is around 5km's off.

#18 tigamica350

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Posted 09 October 2007 - 03:59 PM

Actually the odometer is correct. Even the speed from the ECU is correct.
It's just the speedometer that is around 5km's off.


Either way it's damn annoying
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#19 Sleepy

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Posted 12 February 2008 - 08:16 PM

I have a 2008 4wd BT50 Freestyle and dont have this issue. It still has the standard rims and tyres fitted. Looks like Mazda has corrected this issue, unless its a problem on the 2wd only?

sleepy


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#20 MWG-87

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Posted 13 February 2008 - 09:39 PM

mines an '07 SDX 4wd and its out.

ill take it up with them... im due for my 30 thousand service in about a month or so.

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Mods:

Navigation: Navman F40 W/B2 bluetooth kit
Towing : Hayman Reece Heavy Duty Towbar (3000kg)
Scangauge 2 diganostic display








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