Gearing down my Heritage
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Cruiser
Joined: Jul 2006
Posts: 147
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From: Andover, Maine
Gearing down my Heritage
Thinking about gearing down my 07 heritage. Indy says he gets the best results going down 2 teeth on front sprocket which means I would need a shorter belt. Also my speedo will be off (read high) about 4 mph right up through to cruising speed. ( Can T-Max adjust for this? ) What I'm hoping to achieve is to have more yank down low, better throttle response and to use 6th gear at slower speeds say around 60 mph. Will I be compromising drivability? For example 1st gear feels like your on a tractor so may be starting out in second? Would like some feedback from someone who has tried it.
My bike goes pretty good right now but not quite where I want it performance wise. It makes 90 hp - 104 tourque at 9.8 - 1 comp ratio. I could bump up the comp a little and do a cam change that would get me to about 110-115 torque but the bike runs a little warm as it is when its 80 degrees plus. Luckily I live in Maine and we don't have very many hot days. Trying to figure what my best options are. Thanks in advance for your input.
My bike goes pretty good right now but not quite where I want it performance wise. It makes 90 hp - 104 tourque at 9.8 - 1 comp ratio. I could bump up the comp a little and do a cam change that would get me to about 110-115 torque but the bike runs a little warm as it is when its 80 degrees plus. Luckily I live in Maine and we don't have very many hot days. Trying to figure what my best options are. Thanks in advance for your input.
Road Warrior
Joined: Jun 2007
Posts: 1,523
Likes: 312
From: Out of Commiefornia!
The difference between 2.79 and 2.97 final drive isn't so huge, but it does make a nice difference for our year bikes. I went the other way and put a 70 tooth (four teeth larger) pulley on the rear, since I had the belt adjustment and wouldn't have to replace it, and it had the desired effect - more low end and overall torque without compromising top end.
I think you'll be happy with the results.
Roger
I think you'll be happy with the results.
Roger
Road Warrior
Joined: Dec 2008
Posts: 1,733
Likes: 38
From: Linden, NC
30t transmission belt pulley & H-D 136t (1-tooth shorter) belt. Lots of people happy with that set up.
Final Ratio: 2.97. 75mph = 2900rpm in 6th.
Andrews makes em, as does Evolution.
http://www.andrewsproducts.com/PDF_f...lleys-pg29.pdf
(link if for information only, not an endorsement)
TTS can adjust for it, not sure about the T-Max.
(not an endorsement for TTS either)
Final Ratio: 2.97. 75mph = 2900rpm in 6th.
Andrews makes em, as does Evolution.
http://www.andrewsproducts.com/PDF_f...lleys-pg29.pdf
(link if for information only, not an endorsement)
TTS can adjust for it, not sure about the T-Max.
(not an endorsement for TTS either)
Last edited by Weevil; Apr 9, 2011 at 06:05 AM.
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Tourer
Joined: Mar 2006
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From:
Call zippers and they will send you a speedo calculator that tells you what numbers to put into your Tmax I did it with mine.
Last edited by mori55; Apr 9, 2011 at 06:07 AM.
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Thread Starter
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Cruiser
Joined: Jul 2006
Posts: 147
Likes: 0
From: Andover, Maine
Yeah he does but says that front sprocket change works better.
Thread Starter
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Cruiser
Joined: Jul 2006
Posts: 147
Likes: 0
From: Andover, Maine
I also asked him which way (bump up comp and cam change or gear down) would give me the most seat of the pants pull and he said definitely the gearing. I'm still wondering about how drivability will be though. Anybody out there thats tried this setup?
The sick part is that I'll probably do the cams, pushrods and comp increase eventually even if the lower gearing works really well.
The sick part is that I'll probably do the cams, pushrods and comp increase eventually even if the lower gearing works really well.