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Power to Weight Ratio: Four Stoke vs. Two Stroke

Matt@MPI

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Dec 3, 2010
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I have asked MPI for some of their Dyno results from all the testing they did this year. Hopefully they can share some of their testing results for Aspirated and Boosted sleds.

I'm trying to find the graph but I can tell you that @6psi it holds 100 ft/lbs of torque from 5000-8800 RPM. The stock sled made about 72-73ish it too was a flat line.
 

cacsrx1

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Feb 7, 2008
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Highmore SD
Speaking with NO real firsthand knowlege here.

Are there any legitimate mass produced 2S Turbo kits for $2,500 on the market??

The MPI Turbo option on Snowchecked Vipers is an absolute STEAL in the industry.

They HAVE TO make these kits available dirt cheap.........other wise nobody in their right mind would buy an MTX.
 

christopher

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Nov 1, 2008
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They HAVE TO make these kits available dirt cheap.........other wise nobody in their right mind would buy an MTX.
yada2.jpg
 
B

BigFish BC

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Jan 27, 2005
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kitimat b.c
So explain to me why you allow for a turbo to be added to one sled and not the other? You can turbo up a Pro just as easily as you can turbo up a Viper. Comparing a turbo sled to a non turbo sled and claiming apples to apples is disengenuous at best...

I think what needs to be done, if this comparison is to be at all valid, is to use a turbo 2s when comparing to a turbo 4s. Of course that would ruin your power to wieght argument wouldn't it?

because you will never see a 2s turbo from factory & there is already a couple 4s turbo from factory.:face-icon-small-win
 
R

rmscustom

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Jun 8, 2010
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Power to Weight Ratio only matters when your full on the flipper... How should we measure the other 90% of the ride???
 

cacsrx1

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Feb 7, 2008
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You can spin the power to weight argument any way you want it.......1000Lbs sled with 350hp has a good power to weight ratio........Im sure it would be a great seller.:frusty:
 

10003514

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Dec 17, 2007
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Where is the 610 weight coming from? I thought Yamaha and snowest weighed a 153 Viper MPI turbo this spring at it was 641 lbs ?
 
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cacsrx1

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Feb 7, 2008
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funny i can ride it just fine:face-icon-small-hap
glad you are happy with a 470lb dry 2s:face-icon-small-sho
we can do this all day if it makes yah feel any better:face-icon-small-hap

Looks like the 174's are comming in at 545 RTR.:face-icon-small-win
 
T
Dec 25, 2007
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What's also missing here is a graph with detailed analysis of how much energy is required to ride a sled. And that, right there, has been the difference for most riders to this point. No one wants to be stuck with the fat girl at the dance. Even if her output is higher...
 
M
Nov 13, 2010
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This might have already been said (I didn't read the whole thread).. but when I figure power to weight I add my weight and gear into the mix. Adding another 200 pounds makes a lot more difference to a 120hp sled than it does to a 200hp sled.
Even with that I prefer a 2-stroke in sleds... and a 4-stroke in dirt bikes.
 
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