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 rpm mph change after tuneupu
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Joined: Mar 2010
Posts: 160 Likes: 21
Adjunct
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OP
Adjunct
Joined: Mar 2010
Posts: 160 Likes: 21 |
I recently had tuneup and after the tuneup and front tire change the rpm and mph changed. Used to 4th 60 mph at 4000 rpm, now 60 mph at 4500 rpm, third gear used to be 50 mph at 4000 mph now needs 4500 to get 50mph. any suggestions should i take 06 america back to dealer to have them check engine out?
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Re: rpm mph change after tuneupu
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Joined: Jan 2005
Posts: 12,164 Likes: 1
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,164 Likes: 1 |
What did they do for your tune-up?
(and welcome!)
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Re: rpm mph change after tuneupu
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
You didn't get a different front sprocket installed did you? Your close to describing the differences in RPM/MPH between a 16 tooth and a 18 tooth front chain sprocket. A different front tire circumference affects the Speedo readout as well.
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Re: rpm mph change after tuneupu
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Joined: Feb 2007
Posts: 23,207 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,207 Likes: 58 |
The front tire will effect the speedo if the size is different. Since that would change so would the RPM you see at any given speed.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: rpm mph change after tuneupu
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Joined: Aug 2007
Posts: 10,727 Likes: 5
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,727 Likes: 5 |
sounds to me like you got 500 bonus rpms with your tune-up. lucky! most guys have to pay extra for that 
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: rpm mph change after tuneupu
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Joined: Mar 2005
Posts: 2,419
Oil Expert
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Oil Expert
Joined: Mar 2005
Posts: 2,419 |
I wouldn't think a tyre radius change would do more than a 1-2% speedo change. This is 10%+ difference and worse performance not better. Definitely take it back to the dealer. But a sprocket chnage could account for it.
Cheers, Richard
~~~~~~~~~~~~
09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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Re: rpm mph change after tuneupu
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Joined: Mar 2007
Posts: 114
Adjunct
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Adjunct
Joined: Mar 2007
Posts: 114 |
did they set the idle adjustment back, after maybe doing a carb sysc?
is the idle at 1100 or 1200 rmp now?
just the first thing that came to mind.
cbeacher
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Re: rpm mph change after tuneupu
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Joined: Feb 2007
Posts: 23,207 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,207 Likes: 58 |
Quote:
I wouldn't think a tyre radius change would do more than a 1-2% speedo change. This is 10%+ difference and worse performance not better. Definitely take it back to the dealer. But a sprocket chnage could account for it.
Granted, probably a larger change than a tire change would account for if the fender hadn't had to be modified.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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