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Author Topic: HD Lower gearing  (Read 7062 times)

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fastboatnut

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HD Lower gearing
« on: January 04, 2009, 03:20:17 PM »
my local HD dealer is trying to talk me into changing my gearing to the HD gear sets that drops your rpms 600-800 per gear as I am looking for better take off. I am @ 103TQ and 105HP but it is slow off the line so they suggested doing this! any comments?
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UFO_HOG

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Re: HD Lower gearing
« Reply #1 on: January 04, 2009, 03:40:02 PM »
Maybe I'm thinking about this wrong, but if you want better take off, I would think you would want gearing that would raise your rpm in each gear, not drop. IE: Dropping to 1 less tooth on the front sprocket.
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grc

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Re: HD Lower gearing
« Reply #2 on: January 04, 2009, 04:49:06 PM »
Not sure what the dealer is recommending, but if it's this primary gear and chain set it will increase your rpm's for any given road speed, not decrease them.
---------------------------------------------------------------
G. SCREAMIN’ EAGLE PRO
RACE USE PRIMARY GEARING KIT
This is the kit that will help you get the holeshot at the race
track. This kit increases vehicle acceleration by allowing
the engine to spin higher RPM at any given vehicle speed.
This new combination results in a 1.7:1 primary drive ratio,
versus the stock 1.44:1 ratio. Requires separate purchase
of Primary Cover Gasket. Kit includes 21 tooth compensator
(25 tooth is stock) sprocket and primary chain. For race
application only.
40331-02 Fits ’94-’06 Softail®
and ’94-’05 Dyna models. $134.95
40200-02 Fits ’94-’06 Touring models (’99-’01
fuel-injected models require 36
Tooth Clutch P/N 37707-98A). $134.95
------------------------------------------------------------
If you just want to drag race, this would be a good idea.  If you want to cruise the highway at a reasonable engine speed, not a good idea.

Jerry
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RickC

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Re: HD Lower gearing
« Reply #3 on: January 04, 2009, 04:51:12 PM »
Quote from: grc on January 04, 2009, 04:49:06 PM
Not sure what the dealer is recommending, but if it's this primary gear and chain set it will increase your rpm's for any given road speed, not decrease them.

And higher RPM at cruising speed means lower MPG... If that is a concern at all...
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OILCAN1

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Re: HD Lower gearing
« Reply #4 on: January 04, 2009, 06:19:43 PM »
Change the gear ratio for the off the line and then add a six speed to keep your cruising rpm's under control and you will be happier all the way around.
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Twolanerider

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Re: HD Lower gearing
« Reply #5 on: January 04, 2009, 06:24:07 PM »
Quote from: OILCAN1 on January 04, 2009, 06:19:43 PM
Change the gear ratio for the off the line and then add a six speed to keep your cruising rpm's under control and you will be happier all the way around.

Do motor work to bring the torque curve in much earlier.  It'll cost more and take a lot more labor hours to get done; but it's more fun.
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OILCAN1

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Re: HD Lower gearing
« Reply #6 on: January 04, 2009, 06:54:30 PM »
Amen to that!!!  But if he is dead set on changing gear ratios IMHO he will need to add a sixth gear to be happy with the results
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Twolanerider

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Re: HD Lower gearing
« Reply #7 on: January 04, 2009, 07:13:57 PM »
Quote from: OILCAN1 on January 04, 2009, 06:54:30 PM
Amen to that!!!  But if he is dead set on changing gear ratios IMHO he will need to add a sixth gear to be happy with the results

Definitely.  Then you can do motor work to bring the torque curve in early, strong and long and add the six speed to take advantage of both ends.  Now that's efficiency (well..... sort of)!
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OILCAN1

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Re: HD Lower gearing
« Reply #8 on: January 04, 2009, 07:20:13 PM »
I'm not so sure about effiecient but it will sure as hell bring a smile to his face. And when this happens no matter what it costs it is money well spent
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Twolanerider

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Re: HD Lower gearing
« Reply #9 on: January 04, 2009, 07:23:17 PM »
Quote from: OILCAN1 on January 04, 2009, 07:20:13 PM
I'm not so sure about effiecient but it will sure as hell bring a smile to his face. And when this happens no matter what it costs it is money well spent


Yes.  Yes indeed!  Long hard torque pulls that start early in the RPM range, go around a semi on a two lane road and keep climbing through sixth gear.  That's the dictionary definition of "happiness" in the Funk & Wagnalls on my desk :2vrolijk_21: .
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REGGAB

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Re: HD Lower gearing
« Reply #10 on: January 04, 2009, 07:45:40 PM »
24/37 and a Baker OD6 works well...........of course, too early to tell "how well" just yet.  It's awful hard to keep from twistin' further, especially when she feels like she's at that "LET'S GO" point.

Patience is a virtue..........and one of those things I've pledged to devote much effort to this year.
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RickC

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Re: HD Lower gearing
« Reply #11 on: January 04, 2009, 07:50:43 PM »
Quote from: HML on January 04, 2009, 07:45:40 PM
Patience is a virtue..........and one of those things I've pledged to devote much effort to this year.

Patience? I'm not a doctor... why do I need patience?  :shocked2:
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Re: HD Lower gearing
« Reply #12 on: January 04, 2009, 07:51:45 PM »
Quote from: RickC on January 04, 2009, 07:50:43 PM
Patience? I'm not a doctor... why do I need patience?  :shocked2:

Ba Dum Bum!!! :drummer: :drummer: :drummer: ;D ;D ;D

Hoist! 8)
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Re: HD Lower gearing
« Reply #13 on: January 04, 2009, 07:53:34 PM »
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REGGAB

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Re: HD Lower gearing
« Reply #14 on: January 04, 2009, 07:59:45 PM »
Quote from: RickC on January 04, 2009, 07:50:43 PM
Patience? I'm not a doctor... why do I need patience?  :shocked2:

:ROFLOL:
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