I have zero complaints about my carb. It starts better than some efi models in the winter! I still just push the button, and she purrs like a kitten. lol!!!

 

Well said grizzkiller.
That is about how I feel about quad EFI. I thought when they first came out it was going to be a killer system and it's about time they came out with EFI. Now I'm dissillusioned. There are many complaints about EFI on this board. And this is when the quad is brand new. Wait until the thing gets some miles on it. Then what is going to happen? Computers, injectors and HP fuel pumps are not cheap. What happens when you get water in the fuel system? What happens when you get water into the electrical connections? What about a little beach salt? What about when they start putting O2 sensors on them?
I think it's going to get worse and worse.

The carb re-jetting issue is WAY over rated IMHO. My home is at 1300'. I ride all the way up to 5000'. No problems what so ever.
Sure, if you race, you want the jetting right on the button. But does a few HP loss make any difference on the trail?

 

[quote]
Originally posted by: Doctorturbo
What happens when you get water in the fuel system? What happens when you get water into the electrical connections? What about a little beach salt?[quote]



The same things that happen when you get these contaminents into the system of a carb-equipped machine.

 

Well as I stated about the KQ EFI system, it is not set from the factory (ecm) with wide parameters, thus causing the probs with aftermarket, why did suzuki do this, Im not going to "guess" on that one. also take into acount on the TBI system the KQ uses isnt as flexible / capable as TPI etc. (may be why the ecm is close parameter)As far as a 650i being quiker and faster than KQ, probably so. From what ive heard, not seen, the 650i is quiker and faster than a BF750 because it was given a better ecm than the 650 standard and 750. True? I dont know i havnt seen a 650i race anyone. I have actually considered getting a 650i myself if all the "hype" is true. Im not brand loyal, everyone makes something I like, even polaris. Do I prefer the KQ efi over carb, in some ways yes, but for most part with the type efi system it runs I wouldnt care if it had cards or efi. Ide say if kawi put efi (tpi especially) on the 700 prairie and it was the "right" system, no one who got one would want to go back to carb again, think about it.

 

ZEX, i gotta agree. the tech. is out there to make EFI that will outperform carbs, but it just isn't available on all atvs yet. eventually, there will be no choice. it will be all EFI, but hopefully, by then the EFI systems will be the ones we are all dreaming about right now.

if i had the option of getting an EFI system on by brute that would fully adjust to all of the variables (elevation, temps, ect...) AND BE USER ADJUSTABLE, i would not miss carbs. but for now it is still a coin toss IMO.

monty

 

Last time I checked carbs do not have any electrical connections. They also don't typically have things like a TPS either.
If your talking about getting contaminates in the fuel system. A jet is about 10 times the size of a fuel injector. Time cost for cleaning out a carb? About 1/2 an hour. Time cost for cleaning out an injector? Maybe never. Once they get stopped up with junk, most of the time they never clean up.

Lets see a post with someone that has swamped one of these new EFI quads and got water in the fuel system. How much did the shop charge you to get it back in shape?
The reason a carb will out preform EFI is because of "intercooling effect." An EFI port injection system does not have this effect. The hotter the temp is the better the carb performs over an EFI system.

 

As far as a 650i being quicker and faster than a 750bf, that is not true. I best friend has a 650i and I smoke him on the start as well as the top end.

 

EFI is always better than carbs.

The reason is because carbs only have about 4 "circuits" that you can tune to meter the mixture of fuel to the engine. Therefore a carb setup is always compromising at various points along the rpm range. This is true even under perfectly stable atmospheric and fuel quality conditions. Because the air density, temperature, altitute, humidity, fuel octane, and the load on the engine are all variables, there is no way that a carb can be tuned better than EFI.

An engine requires an infinite number of mixture recipes in order to run at peak performance all the time. EFI allows this. By monitoring several engine parameters at several thousand times per second, EFI can adjust the fuel mixture to make the most HP out of the available resources.

Now, is it worth the extra grand to have it on an ATV, that's your call. Afterall, there is a reason lawnmowers don't have EFI.

 

efi was put on vehicles for one reason only and that was to meet emmision standards.they do not make more power .a properly set carb will run just as good as efi.the fuel and air mix determines power not how it is made. carbs actually are more dependable than efi because they will still run with problems where efi most times will quit altogether.fuel injection has been around a long time,almost as long as there has been gas engines,if it was so superior for power it would have been dominant in the marketplace years ago.emmissions made manufactureres put them on cars and emmisions are making them put them on recreational vehicles.by the way there are self adjusting carbs on airplanes that adjust for altitude and temp as well as on snowmobiles.bombardier and yamaha both had self adjusting carbs .

 

the amount of power the EFI puts out is determined by the size of a throttle body. so if you have a 46mm throttle body is should put out as much power as a 46mm carb.