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Post by Silar on May 1, 2017 14:14:38 GMT -5
I'm running with a 1k contra spring and using 8 gram sliders. If I go WOT, I'm peaking at 10k rpm. I was thinking about going to a 2k contra. I'm having a brain fart. Will going to a higher K contra lower the peak rpm or raise it?
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Post by Silar on May 2, 2017 10:50:28 GMT -5
Did I stump the experts? LOL!
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phatmanxxl
Scoot Enthusiast
Posts: 484
Location: Missoura
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Post by phatmanxxl on May 2, 2017 12:23:36 GMT -5
I'm running with a 1k contra spring and using 8 gram sliders. If I go WOT, I'm peaking at 10k rpm. I was thinking about going to a 2k contra. I'm having a brain fart. Will going to a higher K contra lower the peak rpm or raise it? I upgraded the contra spring, my RPM's run higher now at the top end. |
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Post by Silar on May 2, 2017 13:12:57 GMT -5
I'm running with a 1k contra spring and using 8 gram sliders. If I go WOT, I'm peaking at 10k rpm. I was thinking about going to a 2k contra. I'm having a brain fart. Will going to a higher K contra lower the peak rpm or raise it? I upgraded the contra spring, my RPM's run higher now at the top end. From what to what? |
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on May 2, 2017 13:16:38 GMT -5
Which way you want to tune it. You have HighTuned engine, maybe longer gears 16x50 for more speed and lower rpm?
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phatmanxxl
Scoot Enthusiast
Posts: 484
Location: Missoura
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Post by phatmanxxl on May 2, 2017 13:43:41 GMT -5
I upgraded the contra spring, my RPM's run higher now at the top end. From what to what? Stock (800 I think) to 1500 |
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Post by dexameth on May 2, 2017 19:23:51 GMT -5
A tighter spring will give you higher rpms. Those are crazy stats tho, 8g sliders and a 1k? That thing should drop into high gear QUICK. What motor are you running? My tuned 50mm kit likes the stock contra and 5-6 gram setups the best. Maybe try a shorter variator drive boss or upgear.
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Post by jeff84 on May 2, 2017 22:06:53 GMT -5
yeah, I would agree. if you can spin 8 gram rollers at 10grand, you could surely run a much taller final drive gear ratio.
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Post by jeff84 on May 2, 2017 22:25:08 GMT -5
what scooter are we talking about here?
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Post by Silar on May 3, 2017 14:01:53 GMT -5
It's just a Tao Tao type 49cc with a 50mm BBK, A9 Cam, 18mm carb, big valve head, etc.. just what my signature says.
It runs like a scalded dog. I'm thinking my clutch pads are glazed over or the bell is or something. I may opt to just buy a new performance clutch.
It has some serious pickup and go, and take-off and top speed are fast. Just goes high rpm at take-off, then at top speed around 8k.
And before this turns into a why did I do a 50mm BBK thread... I've had it installed for a couple years now without any issues.
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Post by gsx600racer on May 3, 2017 20:09:49 GMT -5
I didn't think you could buzz a engine built like this up to 10k rpm. Id be concerned about "valve float" and something catastrophic going wrong  As for your contra spring, id might consider freshing the old spring with the same or going up one rpm range. I think going to the 2K spring will be too extreme. You really want to tune your CVT so your RPM's are in the peak power range all the time. Buzzing past the "power band" and then falling back into it is just extra wear and tear on your engine. |
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Post by Silar on May 4, 2017 15:55:14 GMT -5
I didn't think you could buzz a engine built like this up to 10k rpm. Id be concerned about "valve float" and something catastrophic going wrong As for your contra spring, id might consider freshing the old spring with the same or going up one rpm range. I think going to the 2K spring will be too extreme. You really want to tune your CVT so your RPM's are in the peak power range all the time. Buzzing past the "power band" and then falling back into it is just extra wear and tear on your engine. Exactly. That's why I'm thinking my clutch shoes are worn, glazed, or the bell is glazed. The 1k spring I have in there isn't all that old, but the clutch is. So would going to a 2k spring drop the rpm peak or raise it? |
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Post by gsx600racer on May 4, 2017 16:33:01 GMT -5
A heaver/stiffer/higher rpm spring will increase your rpms more than what they are now. It will take more force(either heavier weights or more rpms to overcome the contra spring.
Also a heaver/stiffer/higher rpm spring puts more wear and tear on your belt and variator/roller-sliders/ramp plate guides. This will also create more friction and heat.
In the end, if you are a heavier rider and need the cvt to "kick down" sooner on the hills or you are drag racing, id stick with my previous post thought.
If you think the clutch is slipping, sand the clutch bell, sand any glazing on the clutch pads. See is that helps. If not also consider lighter clutch springs and or a new belt.
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Post by Silar on May 4, 2017 18:30:10 GMT -5
A heaver/stiffer/higher rpm spring will increase your rpms more than what they are now. It will take more force(either heavier weights or more rpms to overcome the contra spring. Also a heaver/stiffer/higher rpm spring puts more wear and tear on your belt and variator/roller-sliders/ramp plate guides. This will also create more friction and heat. In the end, if you are a heavier rider and need the cvt to "kick down" sooner on the hills or you are drag racing, id stick with my previous post thought. If you think the clutch is slipping, sand the clutch bell, sand any glazing on the clutch pads. See is that helps. If not also consider lighter clutch springs and or a new belt. Thanks.. That's what I thought. I'm going to try sanding the bell and pads this weekend. If that helps, I'll just go ahead and get a new clutch. I've got performance everything else, and that is the only thing that is still stock except for the 1k contra. |
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Post by greggkinney on May 5, 2017 17:29:31 GMT -5
wow!! congrats!! your making some serious ass with that lil motor tobe turning 10,000 rpm with 8g sliders and that light conta. whats top speed? and hows your acceleration?
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