Highest Speeds on Sidewinder/Thundercat

[Fleecer]

I recently bought 2 new Yamaha OEM "clutch repair kits" which are pretty much complete primary clutches for 16+ Viper, Venture, Vector, etc... but disassembled. I also run a 12 Vector primary on my 17 LTX SE, a 16 Viper primary on our 1st 25 LTX LE, and will be putting one of the "repair kit" primaries on the 2nd 25 LTX LE. All have Thunder Products overdrive cut.

I also have a couple other spare Japan clutches.

Whats the going price on a new Viper primary?

 

[twyztid]

Whats the going price on a new Viper primary?

They are not really available. If you happen to find one, it will likely cost you $1200+... although I didn't pay that for the 2 that I purchased recently.

 

[Doc Harley]

You're killing me!! Haha!! $hits pretty funny.
Cryotherapy is a deep freezing (-185°) process, opposite of heat treating, with similar outcome.

Tapp/STM are great options. But somehow when someone says, "you shouldn't or can't do that" it makes me want to do it more. Even if it ends up costing twice as much.
All boxed up for ya! If everything goes well, it should be able to take a healthy beating.

 

[Motorhead]

Bringing this post back up after a tumultuous season, that ended well after much strife and frustration. First, a little back story....

Last winter i bought the wife a used 22 Thundercat with TD header tunes and a gen 2 header. The motor is stock and has never had a wrench on it. The turbo is stock, the wheel is stock, and the wastegate is stock with no boost locker of any sort. The intercooler is stock and the muffler is a 2.5 SQ. I did however change the jackshaft on it, so I could bolt a set of Yamaha clutches.

This fall, I put a speed track on it and a hurricane boost tube. All winter I couldn't get any speed out of it. It would run 133 GPS at half throttle, but wide open would hit a wall at 142 and refuse to go more. My 25 winder with no studs would smoke this thing and I couldn't figure out why?

Then......I read a post here by my favorite buddy Turbo Flash pointing out issues with the Hurricane boost tube. Sure enough, mine was melted too. (I won't beat a dead horse here as the boost tube has been discussed elsewhere and I'm over it. ) At any rate, I tried to buy a stock boost tube but none of the local dealers had one available. Luckily, I had kept the piece that I had cut off. I took a section of radiator hose, joined the 2 pieces together, put a hose clamp on either side and slapped it back together in the interim.

I went out and on the railbed for some testing and put down a pass of 148 GPS. My best run groomed trail on snow up till now was 147, so I felt the thunder was where it should be.

I had heard through the grapevine that the big boys in the area would be racing on a lake about 20 min north of me, so upon my return, I loaded the sled in the trailer and hightailed it there.

We never get ice conditions in Northern Maine, as usually it is always snowing. Due to recent rains, when I arrived at the lake, it looked like a skating rink.View attachment 180664 The ice was blue, hard, and smooth. In all my years of racing, i've have never seen such hero conditions like this. I did 2 runs with a best of 156 GPS. This was done at stock ride height with a stock seat. The sled is/was how I ride it down the trail.

Caveat: I'm not trying to sell anything, I don't own a shop, and I'm not a dealer looking for work. I merely want to share what is possible with an off the shelf tune, and a boatload of ambition.

Cheers.....

Sounds like you’ve got your wife’s sled running well! Just amazed at that speed! Yep, I took your advice a few years back about that SQ 2.5” and love how that muffler sounds, and runs so cool on mine,when compared to the stock muffler!

I have a few friends that have always had a wife’s sled, and once they are done with them, they go as good or even better then their modded sled! Congrats on hitting the perfect condition, and of course, for getting that kind of mph at 9550 rpm’s with your wife’s TCat! Woohoo!!

Three of us were up in your neck of the woods 3 weeks ago, and stayed at the Inn in Madawaska, and the trails were fantastic and fast! Cannot beat those County trails, always a wow factor!!

 

[74Nitro]

Ok, awesome stuff. Has your wife been rubbing your nose in it that her sled is faster than yours..... : )

 

[Fleecer]

Ok, awesome stuff. Has your wife been rubbing your nose in it that her sled is faster than yours..... : )

Funny you mention.......

That thunder is so docile at low speeds, you can't tell it's even tuned. Like the old buck typing this post, the wife isn't getting any younger. She is content driving at 50 mph. After getting home from her first ride on the thunder, I asked how she liked it.

She says, "Oh, I like it. It goes great, rides well, and steers well. But.....I know my old apex would burn that thing!"

I asked, "What makes you say that? Did you actually hold the thing wide open and stretch its legs?"

She says, "Oh no......I don't have to, I can just tell the by the sound, my old apex is stronger than that sled.'

I just looked at her and smiled, "As always, you're right again honey.".

You see boys, when it comes to winning races, spare no expense. Winning arguments with the wifey......not worth it.....I'm a Loser!!

 

[Fast]

I recently bought 2 new Yamaha OEM "clutch repair kits" which are pretty much complete primary clutches for 16+ Viper, Venture, Vector, etc... but disassembled. I also run a 12 Vector primary on my 17 LTX SE, a 16 Viper primary on our 1st 25 LTX LE, and will be putting one of the "repair kit" primaries on the 2nd 25 LTX LE. All have Thunder Products overdrive cut.

I also have a couple other spare Japan clutches.

Do you know if there just cutting 30 thou. Off each primary face like we did on the apex's and then 60 thou. off the helix? It's a simple proceedure if we know how much to cut

 

[Fleecer]

Do you know if there just cutting 30 thou. Off each primary face like we did on the apex's and then 60 thou. off the helix? It's a simple proceedure if we know how much to cut

I remember having a phone conversation with Tim and seems to me it was 20 thou, but it's been so many years now I wouldn't gamble any money on it. I'm sure if you called and asked, they'd tell you.

 

[twyztid]

Do you know if there just cutting 30 thou. Off each primary face like we did on the apex's and then 60 thou. off the helix? It's a simple proceedure if we know how much to cut

No idea what they are doing exactly as far as the overdrive cut. That's why I just let Thunder Products handle it.

 

[Fast]

No idea what they are doing exactly as far as the overdrive cut. That's why I just let Thunder Products handle it.

If 20 thou. is the mágic number, you machine 20 thou. off the bottom center of each primary sheave just where the sheaves touch together then bevel it into the rest of the sheave so there's no edge to wear the belt then take 40 thou. off the helix behind where the c clip goes to allow the secondary to shift out that much more