Has anyone dyno'd there 700 Vforce? What were the results for HP an torque? I have an appointment this Saturday. I would like to compare. Thanks![img]i/expressions/face-icon-small-shocked.gif[/img]

 

I don't know why or if its true but its been said many times you can't really dyno a belt driven quad. A skidoo drive train from crank to track sucks up about 30-50% of the HP. I think ATVs would be a little less probably 25-40%. Now the V has 49 HP at the crank stock, take an average of 32% drive train loss and you are looking at 33 hp to the wheels. That would be peak HP, I would love to see the powerband to see if the power only peaks and then falls or if the power peaks and it holds. How early does it build, etc. I don't think you would see this on a dyno with an auto only a engine dyno probably.

Let us know what your dyno run turns out.

 

I know with cars you have to dyno in 4th gear to get an accurate reading because 4th gear is 1 to 1 in the tranny. I'm not sure what kind of readings you'll get with a CVT.

 

I agree. It raises the same questions that I asked when I set up the appointment. He told me he was going to call Dynojet and get any necessary recommendations. I brought up the points of, how will you do a "roll on" and how will you do an "all gear". I have alot of expirience dyno tuning motorcycles. This ATV CVT stuff is all new to me. I ordered a Jet kit so that I can adjust needles and slide response. I never had any luck with Dynojet kits and there main jets. I always used Factory Pro(with OEM JETTING) on bikes. Needle taper was always better engineered for the particular application. I'm looking forward to it tomorrow. I'd better get my 100.00 bucks worth.......[img]i/expressions/face-icon-small-wink.gif[/img]

 

Stan,
Belt drives are notorious for power loss at the wheel or belt on a sled they rob power as the back end has to be strapped down to keep the machine from taking off. The added restriction puts the belt on the sheave at a lower position reducing total top end speed there fore reducing out put readings and horsepower. It is best to go off the crank and an adpator can be made to go onto the crank shaft by taking off the pull start. It is also hard to tune the quad by useing the wheel method as again the motor will not reach full rpm because the cdi retards the motor so much it won't climb out of the power band.

One more thing the Dyno Jets made for the Kawi suck the highest jet for Dyno will not compare with the stock jets in the carbs. Go with Keihins jets all the way they won't let you down.

 

I wish I had a dyno closer to where I live, I have to drive 2 states away to be able to dyno my quad... I'd like to expirement with the clutch mods on the dyno, I think that would help alot... Going to Colorado for vacation...may have to take the quad just to dyno it once...WAM

 

Truthfully dynos work very well for tuning as you can get immediate results. Unfortuneatly dynos don't help in real world scenarios. A good radar gun and stop watch work much better plus a good tach.

 

True. In my expiriece(motorcycles), I tune for the best torque and best average HP near the peak RPM. Torque is what enhances acceleration (ET). I watch the temp and humidity during the dyno runs. Usually I go up one jet size at the drag strip to start because the dyno doesn't take in consideration the coefficient of drag. One up on the mains always gave me alittle more MPH or top end HP at the strip. The dyno would begin to show a fall of in HP at the peak rpm. So, nobody has tried to dyno there Vforce?[img]i/expressions/face-icon-small-happy.gif[/img]

 

I think you will be the first, make sure to get a print out and put it on the web for all to see even if it is screwed up.

 

HMF has posted a dyno run, it's very flat due to the CVT so you really dont get a typical HP vs RPM curve. You just see a flat line. There should be some way to lock the CVT into 1 gear ratio temporarily, that would be great, but I dont know the best way to do that.