High Altitude Adjustments
Aug 25, 2009 | 08:31 PM
#11
Pro Rider
Joined: May 2008
Posts: 268
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In doing some more research I found this write-up..
The 800 Twin EFI has a liquid-cooled, even-firing Polaris Liberty™ parallel-twin engine. Next in line is the 700 Twin EFI, also a liquid-cooled, even-firing Liberty™ parallel-twin engine.
The Sportsman 800 Twin EFI and Sportsman 700 Twin EFI pair these engines with a Bosch® multi-port semi-sequential injection system and Polaris PVT transmission to give riders the full benefit of the power plant. This combination of power, EFI and PVT transmission, has established unbeatable performance in the big bore AWD class.
The electronic fuel injection system (EFI) system makes these Polaris Sportsman models uniquely suited for tough terrain and high altitude riding. In particular, the EFI system ensures response and reliability in the type of rugged, off-road terrain that demands sudden and extreme changes in power and variations in speed.
It is the Throttle Position Sensor (TPS) within the EFI system that delivers precise response from the engine. This also makes the machine more driveable at slow speeds.
The EFI system also compensates automatically for changes in altitude and temperature, ensuring the Sportsman 800 and 700 Twin EFIs start readily in all conditions from –25 degrees F to 120 degrees F and operate smoothly in altitudes up to 10,000 feet.
Glad I'm going scouting this weekend. Give me 2 weeks if I really have to make some changes. I'm hoping the extra elevation doesn't affect me too much.
The 800 Twin EFI has a liquid-cooled, even-firing Polaris Liberty™ parallel-twin engine. Next in line is the 700 Twin EFI, also a liquid-cooled, even-firing Liberty™ parallel-twin engine.
The Sportsman 800 Twin EFI and Sportsman 700 Twin EFI pair these engines with a Bosch® multi-port semi-sequential injection system and Polaris PVT transmission to give riders the full benefit of the power plant. This combination of power, EFI and PVT transmission, has established unbeatable performance in the big bore AWD class.
The electronic fuel injection system (EFI) system makes these Polaris Sportsman models uniquely suited for tough terrain and high altitude riding. In particular, the EFI system ensures response and reliability in the type of rugged, off-road terrain that demands sudden and extreme changes in power and variations in speed.
It is the Throttle Position Sensor (TPS) within the EFI system that delivers precise response from the engine. This also makes the machine more driveable at slow speeds.
The EFI system also compensates automatically for changes in altitude and temperature, ensuring the Sportsman 800 and 700 Twin EFIs start readily in all conditions from –25 degrees F to 120 degrees F and operate smoothly in altitudes up to 10,000 feet.
Glad I'm going scouting this weekend. Give me 2 weeks if I really have to make some changes. I'm hoping the extra elevation doesn't affect me too much.
Aug 25, 2009 | 11:54 PM
#12
Thread Starter
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Range Rover
Joined: Aug 2009
Posts: 104
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Yeah with EFI you dont have to worry about jetting since you dont have a carb.
I imagine if you ride at higher elevations you may still benefit from the lighter clutch weights though.
Im going to try to buy the parts and do the work myself once i get done riding it for the season.
I imagine if you ride at higher elevations you may still benefit from the lighter clutch weights though.
Im going to try to buy the parts and do the work myself once i get done riding it for the season.
Aug 27, 2009 | 05:19 PM
#13
Range Rover
First Things First!
First Things First!
Joined: Oct 2005
Posts: 260
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We ride the '02 500HO's and 850LE from 3000 to 12000 feet in Utah and Colorado without changing anything. The 500s were setup for high altitudes when we bought them and I have never felt much difference in power riding anywhere. The 850 has so much power how could you tell a slight difference.
The trails we ride over 10000 feet are so rough we very seldom go over 20 mph for any distance and would need a track to see a power loss.
The trails we ride over 10000 feet are so rough we very seldom go over 20 mph for any distance and would need a track to see a power loss.
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