Alpha Silber turbo

[madmax]

Had an easy weekend at the cabin and some time to tinker over the weekend. Started experimenting with primary clutch springs. What I found was, the stiffer the spring on the bottom, the worse the bottom end bog got. 120 start rate on spring the bog is almost gone, not very noticeable. Go up to 140 or 160 on the spring engagement pressures and the bog gets way worse. The finish pressure didn’t effect it at all whether it was 240 or 340, but the initial pressure really affected it.
Still experimenting with octane too. Hits the det sensor with 5 gal av gas to pump 91. Torco octane boost does absolutely nothing, Torco states that 32oz to 10 gal should increase octane by 11. That’s absoluetly false. Pretty much need 3-4 gal of 110 per tank of 91 to not hit the det sensor at 9,000ft. Boost gage is at a max of 6lbs boost at 8300-8400 rpm.

 

[Uncle Bob]

Interesting, what is the rate of the stock spring we are running

 

[whittaker727]

What I found was, the stiffer the spring on the bottom, the worse the bottom end bog got. 120 start rate on spring the bog is almost gone, not very noticeable. Go up to 140 or 160 on the spring engagement pressures and the bog gets way worse. The finish pressure didn’t effect it at all whether it was 240 or 340, but the initial pressure really affected it

I don’t actually feel the bog terribly, but it sounds god awful blubbery. Only actually felt it a half dozen times. I’ll check my spring rate and report back.

 

[turboless terry]

Had an easy weekend at the cabin and some time to tinker over the weekend. Started experimenting with primary clutch springs. What I found was, the stiffer the spring on the bottom, the worse the bottom end bog got. 120 start rate on spring the bog is almost gone, not very noticeable. Go up to 140 or 160 on the spring engagement pressures and the bog gets way worse. The finish pressure didn’t effect it at all whether it was 240 or 340, but the initial pressure really affected it.
Still experimenting with octane too. Hits the det sensor with 5 gal av gas to pump 91. Torco octane boost does absolutely nothing, Torco states that 32oz to 10 gal should increase octane by 11. That’s absoluetly false. Pretty much need 3-4 gal of 110 per tank of 91 to not hit the det sensor at 9,000ft. Boost gage is at a max of 6lbs boost at 8300-8400 rpm.

I ran torco on my 09 m8 turbo for ease on trips. A whole can was hitting det sensor. 2 gallons of av gas and wouldn't hit it all day. Torco is overpriced garbage.

 

[madmax]

Stock alpha primary spring is 120/235 I think. Im actually using a spring that Is 120/320. It works quite well as far as the bog goes. The bog is not very noticeable with that spring. Most guys probably wouldn’t notice it. Clutch engagement is a little lower than stock because of the heavier weights, which I don’t like. Personally I don’t like it the low engagement, seems lazier on the bottom end, but at least you can trust it will go when you hit the gas. Boost does come on real quick though.

Anyone tried any other octane boosters that actually work? I just hate hauling race gas when I travel.

 

[killerrf]

Stock alpha primary spring is 120/235 I think. Im actually using a spring that Is 120/320. It works quite well as far as the bog goes. The bog is not very noticeable with that spring. Most guys probably wouldn’t notice it. Clutch engagement is a little lower than stock because of the heavier weights, which I don’t like. Personally I don’t like it the low engagement, seems lazier on the bottom end, but at least you can trust it will go when you hit the gas. Boost does come on real quick though.

Anyone tried any other octane boosters that actually work? I just hate hauling race gas when I travel.

Good post.
Doubt octane booster and 91 would do much...just seems to easy.

 

[willjogervais]

Stock alpha primary spring is 120/235 I think. Im actually using a spring that Is 120/320. It works quite well as far as the bog goes. The bog is not very noticeable with that spring. Most guys probably wouldn’t notice it. Clutch engagement is a little lower than stock because of the heavier weights, which I don’t like. Personally I don’t like it the low engagement, seems lazier on the bottom end, but at least you can trust it will go when you hit the gas. Boost does come on real quick though.

Anyone tried any other octane boosters that actually work? I just hate hauling race gas when I travel.

Good fuel is tough to come by where I live and I used to try all different kinds of octane booster on my blown cars. Only one I ever found that is any good, was good fuel. imo, they are all a waste of money and do little to nothing. Sorry to be a downer

 

[niner]

Stock alpha primary spring is 120/235 I think. Im actually using a spring that Is 120/320. It works quite well as far as the bog goes. The bog is not very noticeable with that spring. Most guys probably wouldn’t notice it. Clutch engagement is a little lower than stock because of the heavier weights, which I don’t like. Personally I don’t like it the low engagement, seems lazier on the bottom end, but at least you can trust it will go when you hit the gas. Boost does come on real quick though.

Anyone tried any other octane boosters that actually work? I just hate hauling race gas when I travel.

https://www.lighthouse-environmental-products.com/shellbourne-fuel-enhancers.html

Been using Shellbourne fuel additive for 2 years now on my MTNTK turbo pro. Mix 25 litres of 91 with 500 ml of additive for 104 Octane. Comes in sealed 1 litre containers. Running 9-10 lbs of boost. Very happy with it.

 

[Backcountrypro]

Here is the info on the additive from Shellbourne. I have used this additive the last two season. Previous I had been transporting race gas to my riding spot. This option is much cheaper and easier. I am running a 800 Etec on 8-9 lbs of boost. 2.1 oz of fuel enhancer per gallon of 91 octane. Sled runs better than running 100% race gas with absolutely zero issue with det. I have filled gas in three different states in the last two weeks, always 91 octane, and sled ran the same all the time. I get my supply from Dave at DPS in Leeds ND.

https://www.facebook.com/davidsperformanceshop/

 

[killerrf]

https://www.lighthouse-environmental-products.com/shellbourne-fuel-enhancers.html

Been using Shellbourne fuel additive for 2 years now on my MTNTK turbo pro. Mix 25 litres of 91 with 500 ml of additive for 104 Octane. Comes in sealed 1 litre containers. Running 9-10 lbs of boost. Very happy with it.

Is your mtntk setup intercooled and is the eng HO or pre16?

 

[clarson80]

Nope, no new tunes yet to fix the low end bog. Kind off disappointing on the part of silber to put out a half finished product. I would be embarrassed to try and market this if i was a dealer for them. Its ridable, but no where near where it should be. The mid range and top end are as good as anything out there.

Went through all that two years ago, pulled it off in the parking lot and sold it when I got home. Never had a phone call get answered, or returned from them. Many issues from fueling to clutching.
Silber installed mine in their shop, so install/setup should be non-issue.

 

[Utah-Jay]

Anyone tried any other octane boosters that actually work? I just hate hauling race gas when I travel.

Race Gas? I have seen this mentioned a few times. Can someone explain it to me? Readily available? Do you have to do something for the engine to burn it?

Thanks

 

[Scrappy]

That platform was the best I've seen for bottom end. Reason? Lightest production crank we've ever seen in an 800 2 stroke sled.

I have ridden many BDs on HO motors, they spool quick! But its a far cry from the snap a NA motor makes. For fun, do a drag race to 20 feet. See who wins...

Per your suggestion, I dragged raced two friends on fresh but setup snow on Fishcreek resevoir on Buff Pass early January. One Ski Doo 850 with 3" Paddle, 154" Track, Can and fox suspension. The other a Ski Doo 850 3" Paddle 165" Track with a can. My 800 Polaris BD Sidekick 155" Track was dead even with them the first 15-20 feet then pulled hard. At no time were they even an inch a head of me.

 

[snopro11]

Good fuel is tough to come by where I live and I used to try all different kinds of octane booster on my blown cars. Only one I ever found that is any good, was good fuel. imo, they are all a waste of money and do little to nothing. Sorry to be a downer[/QUOTE

Gotta be an airport nearby?

 

[turboless terry]

Snake oil

 

[niner]

Is your mtntk setup intercooled and is the eng HO or pre16?

2013 non intercooled.

 

[willjogervais]

Good fuel is tough to come by where I live and I used to try all different kinds of octane booster on my blown cars. Only one I ever found that is any good, was good fuel. imo, they are all a waste of money and do little to nothing. Sorry to be a downer[/QUOTE

Gotta be an airport nearby?

Yes, I eventually switched over to e85 on my boosted cars. For my sled I use a blend of premium and AV100 from my local airport. I don't use any octane boosters. Been bringing a 55 gal drum to the airport to fill up and filling 5 gal jugs for the trailer. The new trailer has onboard fuel so gonna be even easier.

Race Gas? I have seen this mentioned a few times. Can someone explain it to me? Readily available? Do you have to do something for the engine to burn it?

Thanks

You can buy race fuel (I consider race fuel 110 octane and above) from a few providers but AV100 is available from the airport. It is much cheaper than most race fuels. You can blend it with premium at whatever rate you need. It is very stable and doesn't go bad with age like regular fuel. You can also run it through all gas motors before shutting them down for the season, winter or summer. Eliminates the varnishing, ect that happens in carbs and other fuel system parts when gasoline sits for long periods of time.

 

[Utah-Jay]

You can buy race fuel (I consider race fuel 110 octane and above) from a few providers but AV100 is available from the airport. It is much cheaper than most race fuels. You can blend it with premium at whatever rate you need. It is very stable and doesn't go bad with age like regular fuel. You can also run it through all gas motors before shutting them down for the season, winter or summer. Eliminates the varnishing, ect that happens in carbs and other fuel system parts when gasoline sits for long periods of time.

Thanks, I am new to all of this and looking at buying a sled (or two as the wife will want one too) and trying to do all the research I can ahead of time. Do you run race/av fuel in a non-turbo’d sled too?

 

[willjogervais]

Thanks, I am new to all of this and looking at buying a sled (or two as the wife will want one too) and trying to do all the research I can ahead of time. Do you run race/av fuel in a non-turbo’d sled too?

No need to run anything other than 91 in any stockers that I am aware of. Fill her up and have fun

 

[whittaker727]

No need to run anything other than 91 in any stockers that I am aware of. Fill her up and have fun

Unless it’s a Speedwerks, slp or other stage kit with advanced timing, fuel controller, porting of head mods. Lots of info on different threads on this forum.