supercharger vs turbo

thanks guys now I am really in a pickel I am looking for somewhere arround the 280-300hp mark who makes a turbo that can do this and is pretty easy to install

Trxster- you just talked me into going with a 162
 

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The only real easy install is the SC . I don't like the way it feels, like having a potato in the tailpipe until you open it up. Altogether the power on the stage 1( Apex) was a bit disappointing a stage 1 bender turbo on a vector beat it on the top end.
I have a LP coming and will be able to let you know how that worked out. It should have the boon-docking response and mid range power that I am looking for 225- 250 hp tops. Not having a pressurized carb it won't have the flooding out issues of the other kits while jumping etc.
On race day I can run up to about 17-18 pounds of boost with the small turbo, my old Nos kit hanging on the wall so if I want to give it a extra 50 to 80 HP there it is .
:-o
 
I hate to ruin all your high hopes of big power, but with 17-18 lbs. of boost better leave the NOS hanging on the wall. The Yamaha 4 stroke is a fine engine but as with all things there are limits. A steady diet of that boost level will require piston and ring replacement on a regular basis and hopefully not a block along with it. I know I'll get a dosen or so guys ready to tell me they have been running this forever with no problems but all they have to do is a leakage test to find out they have changed things a whole lot and if you use any antifreeze DAMAGE HAS ALREADY BEEN DONE! Anything over 3-4% indicates damage. Cylinder walls distort, head gaskets fail and pistons and rings leak compression. The limit is about 14-15 lbs. and don't detonate it at that. :flag:
 
i am getting a supercharger. Reason being i dont need big HP, i just want to outclimb all my friends with new 800R's and 1000X's.

For big power i would get a turbo, but a supercharger is an instant 10lbs and it will outclimb the guys i ride with by a mile, and thats what i wanted.
 
Big boost is for racing, not your average sport riding. There is no such thing as a race sled you can ride, or a trail sled you can race. Don't get greedy!!!!!!
 
Here's something to consider when comparing a supercharger with a turbo that I've noticed. Assume both units are set to deliver the same maximum boost. Due to how it's driven, a supercharger can only deliver a fixed amount of boost at a specific rpm. This might be an advantage at lower rpms (can create boost sooner), but in the mid and upper rpms a turbo is capable of delivering its boost sooner under certain conditions. I notice that when riding on a turbo around 7000 rpm (beginning of the "sweet spot" for most turbos) you can get off and back on the throttle and have what feels like instant full boost and very quick acceleration because the turbo is already spooled up. A super cannot create its full boost until it revs up past 10,000 rpms. Also, due to the way a snowmobile clutch works and due to limited available traction (in most cases), the low end throttle response is less of an issue since the motor doesn't get loaded until it is allowed to rev more. Just my observations for what-it's-worth... ;)!
 
"A super cannot create its full boost until it revs up past 10,000 rpms." This might be true for a centrifugal traction drive type supercharger because it works similar to a turbo except it's belt driven, but not for a Roots or a screw type blower. This is the reason we do a draw through system because the only thing that stops one of our blowers from making boost is taking the air away from them. If you tried to do a blow through system with a positive displacement blower (ie. Roots or screw type) you would'nt be able to open the throttle plates because there would be to much pressure against them. We also came up with a by-pass system so when you are at part throttle low load you get almost as good of milage as a stock Apex. Plus we can retain stock exhaust system for the riders that need to because of the noise cops. And we don't have to have our clutch engagement at 6500 rpm to try to cover up the lag problem. There is a place for each kind of boost, bottom line, boost is good, no matter how you do it!!! Bill (" I should have built a FREAKIN turbo system it would have been a he!! of alot easier!!!) But then again, who want's to be like everyone else. :Rockon: :Rockon: :Rockon:
 
The TC vs SC subject has about the same re-occurrence rate as the TWINS vs TRIPLES subject in the 2-Stroke world.

Hey does this forum have a search function ???...........lol

Boost on my little SC is smooth, liner, predictable, which makes the sled very controllable using throttle position… Boost follows rpm on a SC so the boost level changes up/down as fast as the needle moves up/down the tack… From 1.5-lbs at 3600rpm engagement to 10-lbs at 11,000rpm in my case… Poking around in the trees at 5000rpm, part throttle, there is 4-lbs of boost ready at the throttle bodies just waiting to be tapped for instant throttle response when you need to make those split-second decisions, change direction, pop the skies over something, jump across a steam vent, or huck it across that creekbed you didn’t see coming… If you need more power just snap the throttle wide-open and you have 10lbs as fast as it takes the needle on the tack to hit 11,000rpm… If you need less power just position the throttle accordingly… If you can live with a 190-200hp at 8000ft you’ll love it… If you need more power than that you’ll hate it.
 
KnappAttack Posted: Tue Oct 10, 2006 4:53 pm Post subject:

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Big boost is for racing, not your average sport riding. There is no such thing as a race sled you can ride, or a trail sled you can race. Don't get greedy!!!!!!
Click to expand...

Soooo True...


--Buster696--
:4STroke:
 
Hey Ike, you won't be making 320 HP here in the US on any pump gas! At least not over three seconds worth. We don't have 98 octane pump fuel. If your riding trails and need to fill up anywhere, your at the mercy of available fuels on the trail. If your lake racing, or for the western guys, hillclimbing, then by all means, put in race fuel. I see too many people talking big boost, big power, and then everyone thinks they can get that type of power. Very MISLEADING for the average sport rider. Again, don't expect to get big boost power without the available octane to support it. Way to many out there are ruining engines. Mike Knapp#17
 
I run 10 lbs on a stock motor on pump fuel 92 octane fuel. I know I am on the edge and I run a parker knock box on my sled as well to check for detonation. Its doable but you have to be very concious of engine temperature etc etc etc and its for short bursts 2000' on the bar lake racing is my max. I can trail ride all day long on 10 lbs but you can't hold it on like a stock sled. You are playing with fire and you need to be concious of what you are doing. Its the game we all play with boost sometimes thigns work out very well and other times they go boom.
 
You Guys make good points, Exept for 320 hp on pump fuel, not sure about that on.
I plan to run 10-12 pounds on Av gas with one extra head gasket for regular riding. For competition we have to find out what works, without a inter-cooler I will need some way of cooling the intake charge at max boost, alcohol or nos or ? I will cross that bridge when I have it running perfect on low boost or when a 2 stroke highmarks me.
That is the real danger with being able to just crank up the boost.

Cheers.........
 
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