Some help / Info on EFI

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big10champ2003

New member
Hello I was wondering if someone could please help me out on how EFI works..... I know it is Electronic Fuel Injection, I get that. I know that vacuum is used in Carbs to bring fuel, & the injectors spit it into the carbs at a set interval in EFI.

My question is: With an EFI machine does one have to do anything for riding in different elevations? Are there Jets to change (wouldnt think)? Do you need to change any of the clutching?

I have always ridden carb sleds, and now am looking at an EFI M7, just looking for some info.

Thanks for any and all help!
 
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flatlandassn

New member
For riding at various elevations, all you need to do is change clutch weights. This is easy to do. I own an M7, and have been very happy with it.
 
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big10champ2003

New member
Ok, I am looking at getting an M7 153 EFI, what weights would you reccomend for use in the U.P.? I am not sure what this sled has in it for weights right now.
 
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timner

New member
75gram for the Yoop. 68g up to 9k feet. I run 65g in the Snowies (over 10k feet).

There's a chart under the hood if ever get confused. The 700 makes peak torque at 7800rpm, however, you should aim for ~8100 for varying snow conditions.

As Flatland mentioned, no changes to the EFI. When you arrive at elevation, just let it idle for a few minutes and it will self adjust. One thing to keep an eye on is the clear plastic tube coming off the ECU. This is the barometric pressure reading. If it gets clogged with snow, the sled will bog.

Any other questions, let us know!
 
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motor_slut

New member
EFI sleds don't have carbs or carburetors. They have throttle bodies and injectors. Arctic Cat is the only one still using a TBI or Throttle Body Injection setup where the injector is mounted to the throttle body. Polaris and Ski-doo use SDI or semi direct injection where the injector is mounted to the crankcase or cylinder to inject the fuel directly into the motor. Ski-Doo is the only one at the moment to have a DI or direct injection motor that injects the fuel directly into the combustion chamber.

EFI works by using sensors on the motor to detect, engine temp, air temp, crank position, air density, ambient pressure, knock, exhaust temp, and several other things to determine the proper amount of fuel needed for the elevation and temperature you are running at.
 
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