I had a brand new 600 efi in 99 and my buddies zl500 would stay with my 99 600 twin and my 97 zrt from 0 to 90+. Pissed me off.

 

I find the carb motors you get more out of them.JM2C

 

Yes you can absolutely get more power out of a carb motor. However, the EFI motor is going to be consistent in all conditions where the carb motor will be faster on colder days and slower when it is warm unless you jet it every time the temperature is different. The benefit of EFI isn't power, it is that it has a computer that adapts to changing conditions on the fly. Start off on the top of a mountain and head toward the bottom and then back up again. The EFI will keep its tune the whole way where the carb motor will lean out at the bottom and get richer at the top. Same with temperature. Start out riding in the morning at 0 deg and when it rises to 20 later in the day the EFI won't care but the carb sled got richer. Carburetors emulsify the fuel better which is why a properly tuned carb motor can make more power.

 

Yes you can absolutely get more power out of a carb motor. However, the EFI motor is going to be consistent in all conditions where the carb motor will be faster on colder days and slower when it is warm unless you jet it every time the temperature is different. The benefit of EFI isn't power, it is that it has a computer that adapts to changing conditions on the fly. Start off on the top of a mountain and head toward the bottom and then back up again. The EFI will keep its tune the whole way where the carb motor will lean out at the bottom and get richer at the top. Same with temperature. Start out riding in the morning at 0 deg and when it rises to 20 later in the day the EFI won't care but the carb sled got richer. Carburetors emulsify the fuel better which is why a properly tuned carb motor can make more power.

Emulsify the fuel ??? An emulsion is a mixture of two or more immiscible (unblendable) liquids.

What other liquid are you mixing the fuel with? Do you mean atomize or vaporize? A fuel injector atomizes the fuel much better that a carberator in any engine.

 

I had a new 99 ZR 500 and had no problem keepeing up with the 600s. It was suprisingly fast for a 500.

 

When the 500 came out in 98, every magazine said they couldve said it was a 600 and nobody would know the difference. The supposed difference is around 7mph top end compared to the 600. Wicked sleds for a 500

 

Atomization (breaking a liquid down to smaller partials) is exactly what a fuel injector does when it sprays fuel into the air stream and it does it more efficiently and precisely than a carb. A carb is just easier to "tweek" than a fuel injection system which must be reprogrammed in order to change the factory settings.

 

You can tweek a EFI system, Fuel regulator and Whatever control box will do that for you from changing your flow and pressure in your injectors, can go as far as bigger injectors for more HP applications and you need the regulators and stuff for pipes and stuff to dial in. Carb is not easier to tweek its rather annoying if your not sure what you are doing and you dont need any reprogramming for minor mods and hes where i disagree with 109jb is this newer EFI sleds are fast if you know what your doing with them if you like to tapper and get your hands dirty then yes you can make both sleds run the same but on older EFI sleds you are at a disadvantage as the ECU's were just coming to life in the computer world and the older EFIs well yes they were slow to a guy that can dial his carb, But put a chip and a regulator and some pipes on those EFI sleds and they haul ass!!

Believe what you want, I could care less. I personally prefer EFI for the benefits I already mentioned. However, in the power department, comparing a sled EFI to a sled carb, the carb wins hands down. Sure if you want to develop your own EFI for a sled you can beat a carb but you aren't going to do it with what we have commonly available. The current sled EFI's just don't have the sophistication or tunability to outperform a carb in our sled application in terms of pure power.

I like the post you placed before this its guys like you that I enjoy reading when they understand and can explain pretty good how a Carb works, but EFI can have to sophistication and turnability you just have to tap into it, Ive been playing with EFIs for about 8 years and played with some really really fast combos and have murdered Big hp carbed motors and like you said I can still drive to the top of a mountain and back up and not touch a thing or stop so really you get the best of both worlds on a EFI, haha but yet All my sleds now are Carbed but there fun to play with and I enjoy learing about everything and anything, best thing to do is get two sleds the same Carbed and EFI and play with both of them thats what me and my brothers did and EFI always came #1....

 

Believe what you want, I could care less. I personally prefer EFI for the benefits I already mentioned. However, in the power department, comparing a sled EFI to a sled carb, the carb wins hands down. Sure if you want to develop your own EFI for a sled you can beat a carb but you aren't going to do it with what we have commonly available. The current sled EFI's just don't have the sophistication or tunability to outperform a carb in our sled application in terms of pure power.

 

I bought a 99 ZL500 carb for a 1000 bucks two winters ago. Loved it. Mostly just quarter throttle bursts on the wooded trails, skis came off the snow every time. What more could you want. That was one peppy little SOB. Nice having that smaller motor too. You could get at every thing easier. Then I hit the 5K mark and of course the stator went. 150 miles after that a ring melted into the piston. Never did get that sled back together. That sled and I had some great times. A guy bought from me in April for $800 broken. I got my moneys worth. Just bought an 01 ZR800 this morning. Two feet of snow coming tomorrow and it's party time for me on the trails for the next 5 or 6 weeks. Can't wait to see what this 800's gonna do. Live in Maine now and have all new trails to explore. Life is good till something breaks of course.

 

"You can tweek a EFI system, Fuel regulator and Whatever control box will do that for you from changing your flow and pressure in your injectors, can go as far as bigger injectors for more HP applications and you need the regulators and stuff for pipes and stuff to dial in. Carb is not easier to tweek its rather annoying if your not sure what you are doing and you dont need any reprogramming for minor mods and hes where i disagree with 109jb is this newer EFI sleds are fast if you know what your doing with them if you like to tapper and get your hands dirty then yes you can make both sleds run the same but on older EFI sleds you are at a disadvantage as the ECU's were just coming to life in the computer world and the older EFIs well yes they were slow to a guy that can dial his carb, But put a chip and a regulator and some pipes on those EFI sleds and they haul ass!!"

I never said you cannot tweek an EFI system, I just said it was easier to tweek a carb than EFI. The EFI system is a lot more complex even on snowmobiles that a carb. Can you switch out jets, adjust screws fairly easily and cheaply. Playing with fuel pressures and reprogramming the ECU on the other hand is not only more expensive with whatever reprogramming system you use and its a heck of a lot more complicated than just switching jets and adjusting needles ect.

 

if i put a regulator on what pressure should it be set at

 

Stock i think is 35-40lbs? WOT is around 45lbs but this can be dialed down to about 42lbs or less, just keep an eye on your plugs when you start dialing it down or up, we have a few sleds that run at different pressures and we dont know if its the gauge or the pump pressure so like a carb we keep an eye on the plugs after ajustments and some pulls untill plugs are nice and brown. May also help with milage also. I also have been told guys with this older efi sled have been throwing on pipes and seems to clean the fuel up with out any modifications to the fuel pressure but thats just information i got from reading alot on it, I was going to use EFI but was told it was going to be much to hard to dial in my 720 bigbore sold all my EFI goodies to a guy guess what he has the same big bore and says it works just fine, So it depends on what you plan on doing i guess.