Thunder Products (Big Venom Viper kit) with Heavy Hitters

[staggs65]

It's a fine line and depends on how bad of a spin. If you're clutched so it doesn't bang the limiter with no traction it will bog down when you have good traction and vice versa. You either find a happy medium or live with one or the other. Cannondale, sounds like you've got yours set up in that sweet spot in the middle. It won't be what a drag racer is looking for that has great traction but what most trail riders should be shooting for.

 

[cannondale27]

Yes it should be controllable. In other words if it spins there should be enough time to let off before it hits rev limiter even at full throttle. Thanks for clarifying.

 

[trevorl1]

I'm getting the stage 4 ecu re flash, and the venom clutch kit, I think with the higher limiter it'll will give a little play with the clutching. I'm not going to use the full 9800 but it'll be there if needed.

 

[murdered141]

Mine can be spun without banging rev limiter and so can Phazer. When it's right it should not hit limiter unless airborne.

I agree, before the clutch kit with the intake and can mod I would spin the track on launch and would touch the limiter very softly and go.

 

[murdered141]

Your hitting the limiter because you loose traction. Look at it like a car. When you spin on ice your RPM's increase. You can't let off quick enough to stop it from happening. How are RPM's otherwise.


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Mid range is good with top end at 88 mph with 8900 rpm

 

[murdered141]

When the sled was all stock , I could spin the track all I wanted on launch and it would never hit the rev limiter, Imo every time you add little more power, you should be able to tune an adjustable clutch kit like this one to keep it of the rev limiter at any rpm.

 

[SnoNinja]

That's where I am at, wondering why I am banging off rev limiter 0-40 mph when I loose traction.

Murdered137:

I also am still hitting the rev limiter when I break traction 0-40. I am adding a little more weight to give a little more cushion below the rev limiter, but I expect I will still hit the rev limiter if I lose traction. I had that happening all stock clutching without the Sandale can. With you mods, I am guessing you are making a little more power than I am, and that will make yours a little harder to control, hence the suggestion of a little more weight. Its a fine line that I am trying to hit. Don't want so much weight that the engine can't pull it, but want enough to allow for some track spin without the RPM's going right into the rev limiter. bumping it once and a while wont bother me, but right now, I can hit it almost every time I take off from a stop or slow roll. I'll keep you posted.

 

[SnoNinja]

Mine can be spun without banging rev limiter and so can Phazer. When it's right it should not hit limiter unless airborne.

Cannondale, I expect your taller gearing is helping you. Feel free to chime in if your disagree, but more load due to the higher gearing should decrease the likelihood that track spin will result in instantaneous over rev.

 

[murdered141]

Murdered137:

I also am still hitting the rev limiter when I break traction 0-40. I am adding a little more weight to give a little more cushion below the rev limiter, but I expect I will still hit the rev limiter if I lose traction. I had that happening all stock clutching without the Sandale can. With you mods, I am guessing you are making a little more power than I am, and that will make yours a little harder to control, hence the suggestion of a little more weight. Its a fine line that I am trying to hit. Don't want so much weight that the engine can't pull it, but want enough to allow for some track spin without the RPM's going right into the rev limiter. bumping it once and a while wont bother me, but right now, I can hit it almost every time I take off from a stop or slow roll. I'll keep you posted.

You took the word's right out of my mouth, just talked to shagman, he thinks my problem is I am still running the 8jp.

 

[cannondale27]

My clutch setup doesn't bang rev limiter ever even with stock gearing unless I were to hold it tight spinning for a long time on ice. Never on snow. If ice and no studs only anyone would lift. Don't see why this is so special. Should be expected.

 

[SnoNinja]

My clutch setup doesn't bang rev limiter ever even with stock gearing unless I were to hold it tight spinning for a long time on ice. Never on snow. If ice and no studs only anyone would lift. Don't see why this is so special. Should be expected.

Agreed, its not special or unexpected. This is a work in progress with the Big Venom kit. We are trying to zero in on the particular sweet spot for our particular sleds, with our particular mods. Once we have that, we can post the final solution using the TP Big Venom products so that others with similar mods have a direction to go. I don't consider myself a clutching expert, but am working on a trial and error basis with NosPro and Shagmans help. Experience is the best teacher sometimes. Right now, I am hitting the rev limiter (lightly) once at hard acceleration on hard pack, as the track spins. When you are WOT on acceleration, there is no way to let off before the rev limiter hits. If I roll into it to eliminate the track spin, I can do that, but I am talking about a hard acceleration from a stop or a slow roll. Even with the 1.6 cobra on good hard pack, I am blowing the track out and tapping the rev limiter. More weight should allow me to lower the RPM enough that the track spin won't put me right into the limiter. We are not talking about track spin on ice, just track spin under hard acceleration.

 

[cannondale27]

Well then yes you guys do have a issue since it should never hit rev limiter at full throttle launch on snow. I know the amount of trial and error it takes to get it right. Been there Everytime I made other changes. You might have to go with less wieght in mid and heel and more in tip. That was the solution with the Magnaforce and the Ulmer weights I ran.

 

[SnoNinja]

Well then yes you guys do have a issue since it should never hit rev limiter at full throttle launch on snow. I know the amount of trial and error it takes to get it right. Been there Everytime I made other changes. You might have to go with less wieght in mid and heel and more in tip. That was the solution with the Magnaforce and the Ulmer weights I ran.

I wouldn't call it an issue, but an opportunity to make it better. Just put a touch more middle as I was pretty good at top, but a little higher than I wanted mid. Hoping lowering rpm at mid range will allow me to climb into hi range well still being below limiter. I will deal with heel after I get tip and mid happy. According to TP guide, keep adding weight as you work down from tip until you start to drop rpm out of desired range. As it stands now, I am 1.6g over where I started, but we were guessing at that as no prior test setups with Sandale can on stock 15 motor with 1.6 137" track. All the variables in particular sleds is what makes the adjustable a weights necessary in order to get optimum performance. Will keep plugging away at it until I get it right

 

[SnoNinja]

You took the word's right out of my mouth, just talked to shagman, he thinks my problem is I am still running the 8jp.

That could be. I am running the 8DN, but failed to mention that in my prior post.

 

[nherbst454]

Unfortunately with our snow conditions so far I haven't been able to perform a full on test to see where the top end is. The one thing I can say is that it seems to pull hard with the Big Venom Kit on hard pack (no area to do a full out run to the top) but I'm hitting the rev limiter very hard in loose / deep snow.

I'm running the 8DN, MBRP Trail Can, and the secondary is set at 6-1. I'm definitely going to have to add more weight since we try to do most of our riding in deeper UP snow when it arrives, now I need to experiment where to add it.