davemhughes said:
check this out http://v-twinforum.com/forums/showthread.php?t=68754&page=2 post 49
3 hp/tq are within the tolerance of a dyno anyway
Dyno question related to gearing
On my last 95 build for my fatboy (not current one) I had it dyno'd and I had 104hp / 105T. I wanted the bike to be a little quicker off the line so I pulled the 32T front pulley off and put a 30T front pulley on. I then re-dyno'd the bike and had 101hp/103T. The dyno kid that did it said lower gearing or changes like a 30T front pulley result in lower dyno numbers on a dyno using rear wheel measurements. My question is: is this true???
1 - 5 of 5 Posts
check this out http://v-twinforum.com/forums/showthread.php?t=68754&page=2 post 49
3 hp/tq are within the tolerance of a dyno anyway
From what I read lower gearing actually increases Torque numbers usually.
Apples to Apples comparison?
AS VH said, you are in the gray area of dyno tolerance. You could dyno it again elsewhere on a different dyno with different weather and get higher numbers instead.
The only way to get a 99% accuracy before and after changing a component is:
- Run on the same dyno by the same operator on the same day (or a damnn similar day, weather wise)
How were your two runs done in comparison to this method?
AS VH said, you are in the gray area of dyno tolerance. You could dyno it again elsewhere on a different dyno with different weather and get higher numbers instead.
The only way to get a 99% accuracy before and after changing a component is:
- Run on the same dyno by the same operator on the same day (or a damnn similar day, weather wise)
How were your two runs done in comparison to this method?
I would say so you have the results...but the bike is quicker and faster up to a certain point and probably feels a lot strongerdavemhughes said:On my last 95 build for my fatboy (not current one) I had it dyno'd and I had 104hp / 105T. I wanted the bike to be a little quicker off the line so I pulled the 32T front pulley off and put a 30T front pulley on. I then re-dyno'd the bike and had 101hp/103T. The dyno kid that did it said lower gearing or changes like a 30T front pulley result in lower dyno numbers on a dyno using rear wheel measurements. My question is: is this true???
1 - 5 of 5 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
V-Twin Forum
V-Twin Harley Davidson forum. Discussion on V-Twin Harley Davidson motorcycles including Dyna, Electra Glide, Softail, Sportster, and more.
Full Forum Listing
Top Contributors this Month
View All
rootintootin
62 Replies
tall terry
55 Replies
Dan89FLSTC
51 Replies
