Thunder Products (Big Venom Viper kit) with Heavy Hitters

[NOS-PRO]

Yup,

If your keeping the 8DN equivalent length....use the 40C4340

If you want to run the 8JP equivalent.....use the 40C4313

These are carbon fiber belts

 

[murdered141]

Why does it seem that the guys with the taller lug track are having the rev limiter issue.

 

[chaleurphantom]

Why does it seem that the guys with the taller lug track are having the rev limiter issue.

Probably because taller lugs mean 8 tooth drivers. Ulmer used too have an awesome chart showing different gear ratios and drivers with 9000 RPM. Alas, it has disappeared with their new website.

 

[SnoNinja]

Why does it seem that the guys with the taller lug track are having the rev limiter issue.

I was hitting it with my stock track, stock exhaust, and stock clutching too. just not as hard. Now with the 1.6 cobra, I hook a lot better and get more wheelie than the weight transfer can control. Once the skis are up in the air (5-10 feet after the launch), if the skis get to high I hit the limiter once and the front settles back a bit and no more limiter. I think the coupled suspension and more aggressive track is compounding our problem at launch. It also seems to depend on the snow conditions in the launch zone. It seems like a little deeper and softer packed snow is less problematic than the launch on hard pack trail. I think the sled can spin more in the softer stuff rather than having uncontrolled wheelie resulting in a sudden loss of traction and tap off the rev limiter. best launches I have had in the last few days were on the packed edges of the road rather than in the middle where everyone has it packed tight.

 

[chaleurphantom]

I was hitting it with my stock track, stock exhaust, and stock clutching too. just not as hard. Now with the 1.6 cobra, I hook a lot better and get more wheelie than the weight transfer can control. Once the skis are up in the air (5-10 feet after the launch), if the skis get to high I hit the limiter once and the front settles back a bit and no more limiter. I think the coupled suspension and more aggressive track is compounding our problem at launch. It also seems to depend on the snow conditions in the launch zone. It seems like a little deeper and softer packed snow is less problematic than the launch on hard pack trail. I think the sled can spin more in the softer stuff rather than having uncontrolled wheelie resulting in a sudden loss of traction and tap off the rev limiter. best launches I have had in the last few days were on the packed edges of the road rather than in the middle where everyone has it packed tight.

I am currently in the process of installing the Big Venom clutch kit on my XTX. I have changed out the track to a 1.75" Backcountry and I have also installed the Sandale silencer. I will also be going with the Gates carbon belt. I am not sure what weights I should go with on this set-up? What weight settings are you running at now? What sort of results are you obtaining?

 

[NOS-PRO]

Why does it seem that the guys with the taller lug track are having the rev limiter issue.

it's all about hookup and spinning.....

Stay with me here as I try to make sense out of what is happening.....

My theory is that when guys have the shorter tracks and take off, the track will spin slightly causing the clutches to shift faster keeping it from hitting the rev limiter. Now that some have larger lug tracks, they are getting great hook up and keeping the clutching in 1st gear longer thus hitting the rev limiter harder or longer. There can also be a time where launching so hard that the track will unload (lose traction) for a split second and cause the rpms to go higher. This is what we need to figure out. A video would be more informative as to how this works and hope I can get something going here.

Have another set of weights coming from Thunder Products and will have these to explain where to add weight, take out weight to get your desired rpm. Now that this little bit of new snow has come, I can get these videos recorded.

On asphalt you try to lift the skis very minimal so you put all the transfer back on the rear track....but if you lift too high, you will cause the track to lose traction and then you get what's called the porpoising effect (this is where the track will hunt for traction) and bounce up and down, getting and losing traction.

 

[NOS-PRO]

I am currently in the process of installing the Big Venom clutch kit on my XTX. I have changed out the track to a 1.75" Backcountry and I have also installed the Sandale silencer. I will also be going with the Gates carbon belt. I am not sure what weights I should go with on this set-up? What weight settings are you running at now? What sort of results are you obtaining?

NA sled?

Sounds like you are setup exactly like SnoNinja, but he is running the 8DN belt.....you have the Gates

The Gates belt will grab harder so you shouldn't hit the rev limiter like he is.

If Lonn didn't setup your weights already (he usually does on all kits) but you can set it up this way.

Base or heel - 3/4 inch allen screw
middle - 3/8 aluminum bolt
tip - 3/8 aluminum bolt with 1 thick washer

 

[murdered141]

NA sled?

Sounds like you are setup exactly like SnoNinja, but he is running the 8DN belt.....you have the Gates

The Gates belt will grab harder so you shouldn't hit the rev limiter like he is.

If Lonn didn't setup your weights already (he usually does on all kits) but you can set it up this way.

Base or heel - 3/4 inch allen screw
middle - 3/8 aluminum bolt
tip - 3/8 aluminum bolt with 1 thick washer

I am running the 8dn now , but I am willing to try the gate's belt to bring launch rpm down, will the secondary washer setup for 8dn work for the gate's or is it different.

 

[shagman]

I am running the 8dn now , but I am willing to try the gate's belt to bring launch rpm down, will the secondary washer setup for 8dn work for the gate's or is it different.

yes if you buy the 8dn length one. That is the one nos and I run.

 

[chaleurphantom]

NA sled?

Sounds like you are setup exactly like SnoNinja, but he is running the 8DN belt.....you have the Gates

The Gates belt will grab harder so you shouldn't hit the rev limiter like he is.

If Lonn didn't setup your weights already (he usually does on all kits) but you can set it up this way.

Base or heel - 3/4 inch allen screw
middle - 3/8 aluminum bolt
tip - 3/8 aluminum bolt with 1 thick washer

It did come with weights in it:
Base or heel - 3/4 inch allen screw
middle - 3/8 aluminum bolt
tip - 3/8 steel 2.6 gms versus 2.3 gms of the aluminum/thick washer. I am not sure if I should change the tip weight?

 

[NOS-PRO]

It did come with weights in it:
Base or heel - 3/4 inch allen screw
middle - 3/8 aluminum bolt
tip - 3/8 steel 2.6 gms versus 2.3 gms of the aluminum/thick washer. I am not sure if I should change the tip weight?

Since you are running the Gates belt, you will be better off with the aluminum and thick washer on tip

 

[chaleurphantom]

Since you are running the Gates belt, you will be better off with the aluminum and thick washer on tip

Sounds good. At the time I ordered the kit, I had no intention to change to the Gates carbon belt. That was something after the fact. I will change the tip.

 

[NOS-PRO]

My goal this season is to have a set of clutches with me at the TY rides setup with the Big Venom kit if someone wants to try it. Swap clutches on their own sled and test....or just change the weights and secondary spring in their clutches.

 

[SnoNinja]

it's all about hookup and spinning.....

Stay with me here as I try to make sense out of what is happening.....

My theory is that when guys have the shorter tracks and take off, the track will spin slightly causing the clutches to shift faster keeping it from hitting the rev limiter. Now that some have larger lug tracks, they are getting great hook up and keeping the clutching in 1st gear longer thus hitting the rev limiter harder or longer. There can also be a time where launching so hard that the track will unload (lose traction) for a split second and cause the rpms to go higher. This is what we need to figure out. A video would be more informative as to how this works and hope I can get something going here.

Have another set of weights coming from Thunder Products and will have these to explain where to add weight, take out weight to get your desired rpm. Now that this little bit of new snow has come, I can get these videos recorded.

On asphalt you try to lift the skis very minimal so you put all the transfer back on the rear track....but if you lift too high, you will cause the track to lose traction and then you get what's called the porpoising effect (this is where the track will hunt for traction) and bounce up and down, getting and losing traction.

.
If I do a daylight test run tomorrow, I'll take the go pro and set it up on the tri-pod or get Ditch Cricket to video the launch.

 

[Alsim]

Yup,

If your keeping the 8DN equivalent length....use the 40C4340

If you want to run the 8JP equivalent.....use the 40C4313

These are carbon fiber belts

If the belts gates grab harder, I was wondering if I try the gate's 8 JP will gave me more top end. The belt is shorter than 8D and probably force the belt going lowest in the secondary. For sure if the belt going up at the same place in the primary ?