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Old 4th November 2009, 13:31   #31
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Quote:
Originally Posted by GTO View Post

I'd say manufacturers intentionally build in speedo errors. Why? Simple:

- You think you are getting more fuel efficiency!
Are you sure this is true?

I have driven my Swift on different highways & my tripmeters almost always match distance signposts. So unless the distance signposts were
also callibrated using a vehicle with similiar over/underreporting - I would
think this would be highly unlikely.
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Old 4th November 2009, 16:52   #32
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Quote:
Originally Posted by jav View Post
After upsizing my indica tires from 165 to 185 the speedo shows exact speed as my GPS.
Just changing the width of the tyres will not have any effect on the speedo error...

My swift on stock tyres has an error of 7.7777777778%

However an interesting thing to note here is that there is no difference in odo readings - they are inline with the signposts & GPS logs, only the speedos seem to be overclocked.

Last edited by sonirohit : 4th November 2009 at 16:57.
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Old 19th December 2009, 10:54   #33
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Originally Posted by phamilyman View Post
My VDi is optimistic by about 7-8%

I want to benchmark it this weekend against Punto, Palio and Vista.

@Architect/Anshuman: please to meetup boys! Any vista owner from gaon?
Almost two months have gone. You guys in the gaon forgot about it or what? I'm very much interested about the results and waiting.
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Old 19th December 2009, 11:20   #34
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I'm a lazy bugger and Architect and I have not been able to match our schedules! Now I don't care ... I mean, KFP - ki fark penda hai. I've mentally adjusted my expectations

/when self and Anshuman met - the agenda was MEAT
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Old 19th December 2009, 23:52   #35
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Architect was in your gaon today. After adding Blaupunkt and buying JBL speakers, architect bought a Pioneer HU as well
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Old 21st December 2009, 18:09   #36
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During one of my trips, I check that ~150 on Speedo of Punto = 147 on Gps.
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Old 29th December 2009, 10:31   #37
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Default speedo error can be checked

Interesting thread.
Speed can be actually calculated from tacho (presuming that tacho is accurate)
say tacho shows 2000 rpm in 5th gear then divide by 0.725 (5th gear reduction) again divide by 3.94 (final reduction) we get 700.15 which is wheel rpm. now with 185 70 14 tyres we have a wheel dia of 1.93 meters. thus the car travels 1.93 x 700.15 meters per minute = 1351.3 which is 81 kmph.
This is what my speedo in my Dzire reads
Cheers
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Old 29th December 2009, 10:59   #38
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Quote:
Originally Posted by goandude View Post
Interesting thread.
Speed can be actually calculated from tacho (presuming that tacho is accurate)
say tacho shows 2000 rpm in 5th gear then divide by 0.725 (5th gear reduction) again divide by 3.94 (final reduction) we get 700.15 which is wheel rpm. now with 185 70 14 tyres we have a wheel dia of 1.93 meters. thus the car travels 1.93 x 700.15 meters per minute = 1351.3 which is 81 kmph.
This is what my speedo in my Dzire reads
Cheers
can this be a case of tacho over-read?
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Old 29th December 2009, 11:20   #39
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@ Phamilyman : I also own a Punto & a Scorpio we can do this when ever we can mutually agree as I would certainly like to know if this error actually plays a part in FE.

BTW i also reside in GGN
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Old 30th December 2009, 08:07   #40
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Quote:
Originally Posted by sonirohit View Post
can this be a case of tacho over-read?
Why do you say that?

Like most others have noted the turbo kick comes in at 2k and this is so in my car too. so I can feel the 2K rpm on 2nd, 3rd, and 4th gear. In 5th the speedo confirms 80 kmph at 2k rpm.
Anybody can confirm this?
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Old 31st December 2009, 12:49   #41
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Ooops. I found this in a review of the swift. Speedo does overread.
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Old 31st December 2009, 13:10   #42
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Quote:
Originally Posted by GTO View Post
I'd say manufacturers intentionally build in speedo errors. Why? Simple:
- You think you are getting more fuel efficiency!
Dear Rush,

Doesnt this make a case for appealing in the court of Law? All my last 5-7 years I trusted I am getting ~15KmPl, but with a ~5% error it was no more than ~14.25? Is this even a valid point to sue the Manufac's?
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