Highest Speeds on Sidewinder/Thundercat

[1nc 2000]

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.....

Fleece can you tell us how to keep a grip on the belt on this hotrod?
Secondary setup?
What gears also?
You can PM me if you dont feel like putting that info on public forum.
An all around trail setup and belt grip on top end power is gold!

 

[Fleecer]

Fleece can you tell us how to keep a grip on the belt on this hotrod?
Secondary setup?
What gears also?
You can PM me if you dont feel like putting that info on public forum.
An all around trail setup and belt grip on top end power is gold!

A big factor is rider weight. I'm at about 185 dressed. Being of small stature did not lend well to picking up chicks in high school, but certainly helps in racing. Lol

I run a straight Yamaha 35 with a Dalton black/tan at 60 degrees. If you are over 200 pounds, this may not work for you.

Do you still have the Viper secondary I sold you? Put that straight 45 with a black/tan at 60 degrees and try it. Or......better yet, I'll buy it back from you. Lol

 

[sideshowBob]

Wow!!!!
I am not surprised that you converted to Yamaha clutches.
I have previously said that if I owned a Cat 998 the first thing I would do is change it over to Yamaha clutches even before a tune...great minds think alike...Great work!!

 

[1nc 2000]

A big factor is rider weight. I'm at about 185 dressed. Being of small stature did not lend well to picking up chicks in high school, but certainly helps in racing. Lol

I run a straight Yamaha 35 with a Dalton black/tan at 60 degrees. If you are over 200 pounds, this may not work for you.

Do you still have the Viper secondary I sold you? Put that straight 45 with a black/tan at 60 degrees and try it. Or......better yet, I'll buy it back from you. Lol

I still have viper secondary i bought from you.
Also have a pro 4 roller secondary.

I imagine you roll into the throttle after over 100mph to keep belt grip or just hammer it from 50mph?

 

[Fleecer]

Yes, we were grabbing it at about 50.

 

[Fleecer]

Blew a belt and over revved at 86% throttle on acceleration....
Poor engine..

Still trying to achieve Fleecer speed...

Might have to fly Fleecer to the UP just to help my poor sled...

Who's tune are you running and what hp?

 

[1nc 2000]

Hurricane 300ss header tune.

 

[Fleecer]

Sorry, my clutching will not work in a Hurricane sled. Different power delivery, which requires totally different setup. I do not have enough time with Hurricane tunes to share worthwhile advice. My apologies, I should have asked this first.

 

[Fleecer]

Wow!!!!
I am not surprised that you converted to Yamaha clutches.
I have previously said that if I owned a Cat 998 the first thing I would do is change it over to Yamaha clutches even before a tune...great minds think alike...Great work!!

Thanks Bob. I kinda need my left foot to earn a living and the cat secondary does not make speed like the Yamaha roller.

 

[1nc 2000]

Sorry, my clutching will not work in a Hurricane sled. Different power delivery, which requires totally different setup. I do not have enough time with Hurricane tunes to share worthwhile advice. My apologies, I should have asked this first.

No problem.
Its always a little different for every sled depending on tune and supporting mods to go along with it....

 

[sideshowBob]

Here's one of my data logs...lol...no where near the speeds Fleecer or other members have run.
My sled can easily run into the mid 120s on the GPS where it runs out of gear, which I am surprised with as is has a 141 x 1.75" Back Country track!
Hurricane 300 Header tune
I am pretty happy with its performance for my use anyway.

 

[NYTurbo]

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.....

Very impressive. What were you running for boost ?

 

[DMCTurbo]

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.....

Hard work pays off Fleecer! Congrats buddy! Can't wait to hear all about it tonight.

 

[Fleecer]

Very impressive. What were you running for boost ?

Max 20 Header Tune. By the end of the run it had ramped up to low 19#s.

 

[sideshowBob]

Max 20 Header Tune. By the end of the run it had ramped up to low 19#s.

As my data log shows my sled makes just over 19 psi boost as well...lol....just 30 mph slower then you "Mach Run Masters"
Just the 300hp header tune, no wastegate or turbo mods on my SW as well.