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Post by greggkinney on May 28, 2017 14:54:00 GMT -5
hello everyone! im installing a malossi delta clutch on my scoot. i have a 52mm bbk, big balve head, a9 cam, ncy golden pulley with malossi backing plate, pg driveface, stage 6 rollers, 20mm kehin carb, moded air box and custom exhaust. my question of the day is about optimal rpm for clutch engagement. supposedly a stock 1p39qmb makes peak torque around 5500 rpm and peak h.p 7500. with the a9 can the numbers may be a little different but probably not much. at what rpm should i set my clutch to engage? i like the feel if acceleration and like to see the front wheel come up a little. i ran ny 50mm build up to 9700 rpm and am hoping this one can do that too. for more pull out of the hole should i set engagement closer to peak torque or peak h.p? with the hoca clutch thats on now it launches at over 9k. takes off fast but feels weak if that makes sense. thanks
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Post by V90Performance on May 28, 2017 17:37:53 GMT -5
You would want to make it take off at peak torque.
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Post by gsx600racer on May 28, 2017 19:53:58 GMT -5
+1 ^^^^ What he said.
5000k - 6000k is a good place to start.
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Post by greggkinney on May 28, 2017 20:09:15 GMT -5
thats what i was thinking. hopefully i can find a stator soon and get er on the road. the new 88cc build has only been about 20' but it launched at 9k and felt like a torque beast even being above its powerband.
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Post by 90GTVert on May 30, 2017 8:49:15 GMT -5
There's more to it than just worrying about RPM. If launching at peak torque means the CVT is already shifting though, forget peak torque and see how high you can get it to rev before the belt starts moving pre-clutch-engagement. If the belt starts shifting, then you lose torque multiplication because the gear ratio is no longer the best for takeoff. Sometimes it may still be best to launch at higher revs than what that allows, but a little trial and error may be needed to see what truly works best. Ideally, zero to some MPH speeds or timed distances should be used if the result isn't obvious. One reason is that, at least in my perception, a higher revving or louder engine can make the rider "feel" better performance. I've had that on some tests of various parts, where I could have sworn it was quicker, but timed results showed otherwise.
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