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Author [ES] [MY] [PL] [PT] [IT] [DE] [FR] [NL] [DK] [NO] [GR] [TR] Topic: 19 tooth sprocket & TuneEcu  (Read 911 times)

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Offline Matts1050

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19 tooth sprocket & TuneEcu
« on: 23 March, 2012, 09:23:49 PM »
I am thinking of installing the 19 tooth front sprocket. I want the odometer to be accurate, I don't care about the speedo as i use my GPS for that. What percentage + or - do I need set things to?
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Offline indytiger1050

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Re: 19 tooth sprocket & TuneEcu
« Reply #1 on: 23 March, 2012, 09:40:33 PM »
it's normally optimistic.
Between -3 to -6.
Since you have the GPS just start tweaking until they agree.
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Offline dikman

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Re: 19 tooth sprocket & TuneEcu
« Reply #2 on: 24 March, 2012, 12:24:16 AM »
If my reasoning is correct, normally just fitting a 19t sprocket sets the speedo pretty accurate (according to other members) but the odometer then reads about 5% low. So, if you then adjust the speedo in TuneECU by +5, it should make the odo accurate but the speedo wil be way out? I suppose the easiest way is to then check them against a GPS.

Bear in mind that maths is not my strongpoint  :164:.
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Offline Matts1050

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Re: 19 tooth sprocket & TuneEcu
« Reply #3 on: 24 March, 2012, 12:45:49 PM »
Again, I don't care about the speedo, I want the odometer accurate. I would think the speedo would be at the same inaccuracy as it was originally. Anyone done this yet?
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Offline Yellow Dog

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Re: 19 tooth sprocket & TuneEcu
« Reply #4 on: 29 March, 2012, 03:10:28 AM »
*Originally Posted by Matts1050 [+]
Again, I don't care about the speedo, I want the odometer accurate. I would think the speedo would be at the same inaccuracy as it was originally. Anyone done this yet?

If you get one right, the other will be right too  :033:
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Offline dikman

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Re: 19 tooth sprocket & TuneEcu
« Reply #5 on: 29 March, 2012, 09:45:52 AM »
Don't think so. Normally, the speedo is running about 5-6% fast, but the odo is correct. Any changes will affect both, there will always be that % difference. I'm not aware of any way of affecting one without the other.
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Offline mustangpilot

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Re: 19 tooth sprocket & TuneEcu
« Reply #6 on: 09 April, 2012, 06:14:35 PM »
Changed to 19t front at approx. 3500km. Speedo has been spot-on with GPS since.
ODO reading was 5% low compared to GPS log ever since.
The trip/fuel mileage/fuel to go were affected as well.
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Offline AnarchoXen

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Re: 19 tooth sprocket & TuneEcu
« Reply #7 on: 09 April, 2012, 06:22:02 PM »
Of course it would be. The +/-5% has to be made up someplace.
adam

Offline Matts1050

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Re: 19 tooth sprocket & TuneEcu
« Reply #8 on: 06 June, 2012, 09:48:44 PM »
SO again, if I set the TuneECU to +5 the odometer will be accurate and the speedo will be like it always was-optimistic?
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Offline dikman

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Re: 19 tooth sprocket & TuneEcu
« Reply #9 on: 07 June, 2012, 12:29:57 AM »
Sounds right, although the +5 is an arbitrary figure. You would have to check against a GPS to see if that is the correct figure for your needs (could go a little either way).
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