Turbo and Powervalve elimination

ICLIMB · Mar 29, 2008

Just wondering about deleting the powervalves on a turbo'd M. An M7 specifically. Anyone run this setup on their boosted sled? Seems like it would eliminate some variables for tuning and trouble shooting. Just wondering.

Thanks

2strokeboost · Mar 29, 2008

gottem on my turbo m1000, uses more fuel and you dont use the exhaust valve feature on bd box, saves weight and no more cable problems, i like em, also got rid of oil injection pump with bd removal kit, even more weight savings awesome

ICLIMB · Mar 29, 2008

Is it a noticeable amount of fuel usage. Maybe you could tell me why its using more fuel without the valves. I didn't really care about the weights saving but thats a good point. I mostly was thinking about the servo motors and cable issues that can occur. Thanks for the info.

m8magicandmystery · Mar 29, 2008

snowdoo said:
Is it a noticeable amount of fuel usage. Maybe you could tell me why its using more fuel without the valves. I didn't really care about the weights saving but thats a good point. I mostly was thinking about the servo motors and cable issues that can occur. Thanks for the info.

then consider SUPREME TOOL MANUFACTURING (STM) valve set ups...they are an operating and easily adjustable valve replacement kit for your sled that still ELIMINATES servo motor and cables...

ICLIMB · Mar 29, 2008

Yeah I have seen those valves, I think they are a good idea. A little spendy though. Seems that it would be easier to tune by eliminating the opening of the valves, not only for a turbo app. but for stock factors as well. Maybe I'm wrong in my thinking. Supreme tool looks like its a pretty good company, they seem to make some cool stuff.

m8magicandmystery · Mar 29, 2008

snowdoo said:
Yeah I have seen those valves, I think they are a good idea. A little spendy though. Seems that it would be easier to tune by eliminating the opening of the valves, not only for a turbo app. but for stock factors as well. Maybe I'm wrong in my thinking. Supreme tool looks like its a pretty good company, they seem to make some cool stuff.

well im getting my m8 bigbored to Terraalps 900 kit, and my impression that if l wanted to make any powervalve changes from stock,and stock is the first option,that the STM valves really work well...so what the heck im going for the STM...l just don;t want the hassle of the cables and servo to let me down...and the STM can be set easily for any rpm opening and syncronizing seems easy...oh well l hope for the best...guess the reason for swap forums etc is for when we make a miscall

2strokeboost · Mar 29, 2008

snowdoo said:
Is it a noticeable amount of fuel usage. Maybe you could tell me why its using more fuel without the valves. I didn't really care about the weights saving but thats a good point. I mostly was thinking about the servo motors and cable issues that can occur. Thanks for the info.

not sure exactly why more fuel being used but saw the same thing on my 2003 mountain cat 900 when we were tieing the powervalves open. usually 50-60 miles a trip and carrying extra fuel but thats wide open all day

Nubulin · Mar 30, 2008

The reason more fuel is used is the exhaust port is WIDE OPEN all the time. You dump fuel out the open port at low and mid RPM. There is a reason all high output 2 strokes have variable exhaust valves. Just talking them off is a bad idea. Most electric valves run closed until a set RPM, then open all the way. The cat 1000 has 3 positions. In my opinion, something like the STM ski-doo RAVE style valves that progressively open as RPM increases would give you better overall performance than just taking them off entirely.

I can't speak to your turbo question. I assume either of these would effect the amount of air the turbo gets and thus the air going into the motor. In theory either type would be a more gentle boost transition over the RPM range than open/close type valves.

ICLIMB · Mar 30, 2008

I was goofing with the servo on my M7 seemed like it had about 3 posistions too. Thanks for the info.

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Turbo and Powervalve elimination

ICLIMB

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m8magicandmystery

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ICLIMB

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m8magicandmystery

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2strokeboost

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