After a couple hundred hours and over a 1000 miles no issues at all with the X2 500EFI.

 

<div class="FTQUOTE"><begin quote>Originally posted by: HIGHOCTANE

Very few EFI only problems will cause the machine to not run at all. Most of the time when a sensor fails the ecm will use a default Value. It may run poorly and/or not hold at idle but most times it will run well enough to get you home. An exception is a complete fuel pump failure,but most times the pump warns you by failing only when it gets hot at first. So if u go deep in the woods when u

have been having it act up,yeah you might get stranded.



As for the automotive industry having longer to develop the technology. Where do you think Polaris got the tech from? They didn't invent some new system, and I am willing to bet the company that makes the Polaris EFI components also makes them for other vehicle manufacturers and different type vehicle/engine applications and has alot of experience doing it. I lay money that Polaris doesn't manufacture most of the EFI components, probably Bosch or the like.

The above mentioned 1st year stalling and overheat problems were probably due to ECM fueling calibrations and mapping. This happens in the Automotive field as well. Case in point in 2003 when Ford introduced the supercharged Mustang Cobra it has a similar stalling problem, a TSB was issued and problem vehicles had the computers re-flashed with mapping ect to fix the problem.

As for the 09's,the XP at least has at least 1 improvement and that is an Idle Air Control Valve. This means the idle is very repeatable and consitent. Mine is rock solid at 1200 hot or cold. Looks like the only components missing from the system when compared to an auto is oxygen sensors(which is why you can run leaded fuel in a Polaris without damage) and a few emission control only devices.</end quote></div>

Just to add a point to what you are saying, if you look at the technology involved in a EFI system it comes from street bikes. The Yamaha Raptor 700R and now YFZ 450R uses its technolgy from the R1 street bikes!

 

Had my bike for almost a year now and 800miles and no problem love it.

 

<div class="FTQUOTE"><begin quote>Originally posted by: DODGE57HEMI

<div class="FTQUOTE"><begin quote>Originally posted by: HIGHOCTANE



Very few EFI only problems will cause the machine to not run at all. Most of the time when a sensor fails the ecm will use a default Value. It may run poorly and/or not hold at idle but most times it will run well enough to get you home. An exception is a complete fuel pump failure,but most times the pump warns you by failing only when it gets hot at first. So if u go deep in the woods when u



have been having it act up,yeah you might get stranded.







As for the automotive industry having longer to develop the technology. Where do you think Polaris got the tech from? They didn't invent some new system, and I am willing to bet the company that makes the Polaris EFI components also makes them for other vehicle manufacturers and different type vehicle/engine applications and has alot of experience doing it. I lay money that Polaris doesn't manufacture most of the EFI components, probably Bosch or the like.



The above mentioned 1st year stalling and overheat problems were probably due to ECM fueling calibrations and mapping. This happens in the Automotive field as well. Case in point in 2003 when Ford introduced the supercharged Mustang Cobra it has a similar stalling problem, a TSB was issued and problem vehicles had the computers re-flashed with mapping ect to fix the problem.



As for the 09's,the XP at least has at least 1 improvement and that is an Idle Air Control Valve. This means the idle is very repeatable and consitent. Mine is rock solid at 1200 hot or cold. Looks like the only components missing from the system when compared to an auto is oxygen sensors(which is why you can run leaded fuel in a Polaris without damage) and a few emission control only devices.</end quote></div>



Just to add a point to what you are saying, if you look at the technology involved in a EFI system it comes from street bikes. The Yamaha Raptor 700R and now YFZ 450R uses its technolgy from the R1 street bikes!</end quote></div>

Exactly! And that tech's reliability and precision is closely controlled and monitored by the EPA/DOT. Ever notivced that alot of EFI related sensors(which have everything to do with emmision control) have longer warranties than anything else on a motor vehicle? It is mandated,which means the manufacuters would be wise to use quality stuff. Cheaper to build it right the 1st time than to have to replace it alot in most cases. Again alot of these components are not made or designed by the auto/atv maker. Yes they have a say in the specs on some things but they do not make most of it, and I'm sure they heavily rely on the company who makes it for their expertise. Bosch is a big one for fueling components,as well and brake equipment, ignition components ect ect. Of course there oare alot of others, but Bosch does ALOT. I haven't looked into it but I would bet the Polaris fuel injectors are bOSCH.

Edit-Found it, they use a Bosch EFI system. And guess who was first to use EFI on an ATV? Trust me Bosch knows a little about EFI,lol.
Here's a quote from an article I found right here on the connection.

"The next question would be what happens if the Bosh EFI fails. First off, the ECU will revert to "fail-safe" mode so you can get back home, so you won't be left out in the "toolies", however you will loose the ability to adapt to ambient conditions. There are two parts to the software of the ECU. The first part of the software controls how the engine runs by regulating the amount of fuel flow through the injectors by polling a series of sensors. The second part of the software consists of the diagnostics. The diagnostic software knows what the reading from the sensors should be and is constantly on the lookout for an anomaly. When the software detects something thats value is beyond a preset parameter, it first tries to correct the problem. However if the problem is outside of its on-board capabilities, it issues a trouble code".

 

Don,t expect a awesome difference with EFI. Remember this are throttle body's the most simple EFI there is ,like what Chevy used on there late 80s pick up trucks. Its nothing like more suffocated "Direct Fuel Injection " or "Port Fuel Injection " fonund on todays cars.

I jumped on a 500 EFI and besides the sticker on the side that says "EFI" i would not of known the difference,no power increase but was told it starts easy in the winter,although my carb ATV starts easily in the coldest winter days also, and has better gas mileage.

<div class="FTQUOTE"><begin quote>Throttle Body Injection is the most simple type of EFI and the closest to carburetion in operation. Fuel is injected above the throttle blades by one or more fuel injector nozzles. Both fuel and air are carried throughout the entire intake tract.</end quote></div>

 

<div class="FTQUOTE"><begin quote>Originally posted by: TLC

Don,t expect a awesome difference with EFI. Remember this are throttle body's the most simple EFI there is ,like what Chevy used on there late 80s pick up trucks. Its nothing like more suffocated "Direct Fuel Injection " or "Port Fuel Injection " fonund on todays cars.



I jumped on a 500 EFI and besides the sticker on the side that says "EFI" i would not of know the difference,no power increase put was told it starts easy in the winter,although my carb ATV starts easily in the coldest winter days also, and has better gas mileage.



<div class="FTQUOTE"><begin quote>Throttle Body Injection is the most simple type of EFI and the closest to carburetion in operation. Fuel is injected above the throttle blades by one or more fuel injector nozzles. Both fuel and air are carried throughout the entire intake tract.</end quote></div></end quote></div>

Actually TLC they do NOT use TBI, the Polaris' use sequential multi port fuel injection. One injector for each cylinder placed in the head at the intake port that despenses fuel in a sequence timed to the intake stroke..big difference.

 

EFI hasnt given me one problem since I bought it, i will not go back to carbed models, I will get the 5 year warranty with and EFI model though as they get expensive to fix.

 

EFI, there is no better. had water and mud dont seem to both it as well.

 

02mag-in a perfect world and perfect conditions i would say sure you dont need it, but it would be nice to have. i dont know who lives in the perfect condition world where its always one temp, the humidity is the same every day, it never gets cold or rains or snows and is at the same elevation all the time. yes slight variations of these a carb will handle. but when, here in iowa, its 98* and 75% humidity in the summer and -20 with a wind chill of -35 a carb has too many problems. and they are very hard to start in the winter. EFI will start every morning in the winter.

mt-i know! i havent had time lately to ride with all the kids soccer and hockey practices and the wife throwing a holloween party friday night. i will add them as soon as i get more!!!

 

I'm on my 4th efi..Put about 5000 miles on each of the first 3 and NEVER had a problem!!