Rev limiter
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Road Captain
Joined: Apr 2010
Posts: 709
Likes: 1
From: Maine
Rev limiter
When i hold my bike open and it hits a little over 5000 it feels like the ignition is skipping. is that the rev limiter? Would enabling rev extend to 6200 make this less noticable when i go to shift a little over 5000. I never noticed a rev limiter so pronounced on other bikes i own. This is on a 2010 efi
Road Master
Joined: Aug 2008
Posts: 928
Likes: 0
From: Redmond, WA
Not sure if it is the rev limiter on your scoot that is causing this problem; however, I have a Stage 1 on mine which extended the limit to 6200 and when I hit the limit it basically dumps all the compression until I back off the throttle.
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Road Captain
Joined: Apr 2010
Posts: 709
Likes: 1
From: Maine
dumps the compression
What does that feel like?
Road Master
Joined: Aug 2008
Posts: 928
Likes: 0
From: Redmond, WA
It is weird but the engine pulls hard right up to redline and then it is like all the compression is dumped. The engine wont respond until you throttle back and let the rpm's drop or quickly upshift into the next gear. The engine responds again as soon as the rpm's drop below the limit. It is something to be mindful of if you are accelerating at full throttle through the gears; you need to watch the tach if you have done a build with cams because most after-market cams will get you to redline much quicker than your stock setup... just make sure you upshift before hitting the limit or you are going to loose power, etc.
Cruiser
Joined: Jan 2010
Posts: 101
Likes: 0
From: Alberta Canada
I do not understand why anyone would rev a Harley this high. Look at most dyno charts and you'll see the torque drops out some where between 3000 and 4000 rpm, depending on setup. Shortly after it starts to drop you are not really gaining anything extra. Anyone who knows where their max torque is and shifts and stays in that top band will out run anyone reving the crap out of their bike. Just 'cause you can doesn't mean you should.
Tourer
Joined: Jul 2009
Posts: 384
Likes: 2
From: Eastern NC
I do not understand why anyone would rev a Harley this high. Look at most dyno charts and you'll see the torque drops out some where between 3000 and 4000 rpm, depending on setup. Shortly after it starts to drop you are not really gaining anything extra. Anyone who knows where their max torque is and shifts and stays in that top band will out run anyone reving the crap out of their bike. Just 'cause you can doesn't mean you should.
Last edited by ryanl; Apr 8, 2010 at 05:13 PM.
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Cruiser
Joined: Jan 2010
Posts: 101
Likes: 0
From: Alberta Canada
Ok! Show me your dyno chart. When your torque starts to drop away there is no reason to continue to rev the hell out of the bike. A HD down load or a PC rev extend etc., raising the rev limiter is not the point, and means nothing. If your torque is falling away, whether it be at 3, 4, 5000 rpm, any rpm rise after that is a waste of time and flogging your engine for little or no gain. Just because all your horsepower comes in at 6000 rpm, again means nothing. Torque is want gets you up to speed, horsepower is what maintains that speed. Building an engine for torque will guarantee you get horsepower, building an engine for horsepower doesn't guarantee torque. I'll take torque over horsepower any day of the week, that's the whole point of a Harley. Thought I would add - read my original post. I did not state that the bike would only make torque between 3000 and 4000 rpm, only that it would start to drop somewhere in that area depending on setup.
Last edited by grumpy old biker; Apr 9, 2010 at 10:59 AM. Reason: add to
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Cruiser
Joined: Jan 2010
Posts: 101
Likes: 0
From: Alberta Canada
I'll also add a little more gas to the fire. Everyone who is slapping 95" or 103" barrels on their bikes with out flowing the heads are wasting their money. The heads on 88" and 96" engines are just barely meeting the demands on a stock engine. These kits are the biggest over sale on the market today.
Seasoned HDF Member
Joined: Oct 2006
Posts: 5,977
Likes: 85
From: Nevada
Ok! Show me your dyno chart. When your torque starts to drop away there is no reason to continue to rev the hell out of the bike. A HD down load or a PC rev extend etc., raising the rev limiter is not the point, and means nothing. If your torque is falling away, whether it be at 3, 4, 5000 rpm, any rpm rise after that is a waste of time and flogging your engine for little or no gain. Just because all your horsepower comes in at 6000 rpm, again means nothing. Torque is want gets you up to speed, horsepower is what maintains that speed. Building an engine for torque will guarantee you get horsepower, building an engine for horsepower doesn't guarantee torque. I'll take torque over horsepower any day of the week, that's the whole point of a Harley. Thought I would add - read my original post. I did not state that the bike would only make torque between 3000 and 4000 rpm, only that it would start to drop somewhere in that area depending on setup.