I wish you guys could meet somewhere and race. Then report back the winner and his/her setup. I am new to this and I would love someone to give me the step by step modifications to take me from Stock to something much better over time and investment.

 

You guy's are starting to scare me

 

if anybody wants to come out to gordonswell sand dunes in southern california to settle this once and for all just let me know, i am getting results w/hpd spring set up with dual dmc and homemade snorkel i beat alot of piped bansheese on thanksgiving wknd at the flat sand drags and up hill drags raptors are no problem unless they have more than a pipe/jet kit , piped yfz450 i can beat out of the hole bad but most of them catch up and pass me

 

Hey guys, the dyno works fine with an automatic, just a little tricky for engine testing because when you make an engine change that changes the rpm of the power band you have to clutch accordingly to see the full effect of the engine changes. If the dyno drum is a little light for your hp you can get a little more HP, 0.5-1hp more with heavier weights then the best setup in the field.
On the spring issue, a stk or lower powered V needs the rpm pulled back to be quick and then be able to rev on top. A stiffer primary spring will give a bit better top speed but slower to get there.
Talk to Dalton and Dale can give you the actual 100-200-300 and 400ft times and speeds.
And Dale KNOWS how to setup a CVT
see videoV force video
Ray

 

Those dynos work fine to learn a few characteristics of the engine,and are a great tool for jetting etc. If you leave the clutching alone it wil demonstrate very easily the best jetting etc. I have spent time on dynorays dyno with a v. I have also learned not to use them for calibrating cvt's. We manufacture helixes ,weights and springs for many snowmobile clutch kit companies. Many of these shops use these track dyno's to LEARN ENGINE CHARACTERISTICS. The successful ones always field test to calibrate clutching.
With my v on the dyno,we could keep adding weight etc and keep showing more hp,What was best on the dyno for clutching was NOT the best set up in the field. I personally work with a lot of top snowmobile drag racers,and a lot of them agree that a track dyno is a useful tool.Many use them to learn characteristics,but FIELD testing wins at the track.

We have a race mod banshee,a V ,and my old race mod scrambler. The scrambler is by far the fastest.It is about 75 lbs heavier than the banshee. It still has electric start and reverse,but it routinely smokes the race mod 15:1 banshees at the drags(the banshee crowd love us if we win with the banshee,but hate my scrammbler with a passion on days that have traction and it blows them away.) My point is...That seeing what I've seen on the dyno,I know that the scrammbler would dyno less than what the banshee does.But it matters squat,as the scramm is about 1 tenth quicker. CVT's do not show comparable #'s on dynos.as the shift ratio is always changing.
If you want to see that scram,look at dynoray's video.I let him advance that round, and went on to win both the 2 stroke open,and the outlaw class with the scram. If not for a couple of mishaps,Ray could have gotten to the final on the v.I fully intend to have that VForce turning low 5's on pump gas next season. As it was ol' Ray made some 450's pretty sick to their stomach.(some of them have scoffed at the V a time or two in the past),lol.

 

What have you and Ray done to your Vs?

 

i would also like to know what you guys have done to your v's

 

Thanks for the confirmation. I figured you'd jump into this thread eventually.
To believe that a CVT dyno's correctly would mean that my 700 twin only makes 6 more HP than an air-cooled 400ex, but makes nine less than a Bomb. 650. That's just not logical.

 

kevin, i noticed in the kawirider forums you said that the hpd plain over revs the motor,what spring did you chane to. i have the same set up as you w/ dmc pipes ect. and run an hpd plain w/2 washers and im getting good results my tachs readings are 7640 rpm wich i thought was kind of high but didnt really think about it until this thread

 

Going by just a seat-of-the-pants feeling comparing it to the purple I was running. I've had excellent drag-race results with the HPD, but when I wind it out on a road somewhere it doesn't feel quite as strong on top as the purple did.

I don't know that its necessarily overrevving mine, it may be my imagination, but people are using it with stock or mildly modified motors and I believe its too much spring for them. That's why this thread was started.

Hopefully if the weather clears, we'll start messing with my brother's stock V and I'll show everyone with pictures what each change does compared to mine.