Why is there no fuel injection on the high end sport quads????? wouldnt this be a more superior way of running these quads over the old carb??? No more chanching jets every other day to keep it right, there must be a reason that the quad companys dont use fuel injection on sport quads, but on the utility quads it seems to not be a promblem??????????????????[img]i/expressions/face-icon-small-confused.gif[/img]

 

i guess you never seen a cannondale?

 

Cannondale had FI on their quads (Now ATK) and I believe that GasGas has a 450 with FI. It really comes down to one issue...Money. Costs more to build and costs more to buy. Personally, I prefer a good 'ole carb. Easy to tune (no computer required) and cheap to fix/replace.

 

With a Megasquirt Fuel Injection controller and some salvage parts, you can fuel inject any quad. Build it yourself controller, very inexpensive.
Google up MegaSquirt

This setup rocks!

 

I haven't had to change a jet in 2yrs...

 

I've heard of somepeople doing that but i heard it was really expensive (800+)! Guess thats not true

 

KMS performance has EFI setups for the raptor, 400ex, and DS650. I'm sure that with some creativity these could be adapted to most any single cylinder quad..

People fear change. Carbs are what most ATV people know so that's what their comfortable messing with. Some new 4x4 atvs are starting to come with EFI but some will not buy it for fear of having problems with it and not being able to work with it. Electronic stuff just weirds people out. Add EFI to a sport quad and it better perform way better than a competitors normal carb or people will think that the extra cost of EFI is not worth it and the truth is that EFI is not much better than a well tuned carb for most normal uses.

 

I think it would be hard to make a case that fuel injection is far superior to a properly tuned carb, at least as far as sport quads are concerned.
How do I back this up? In similar sportbikes (motorcycles) where one model is injected and one carbed there usually is like a 5% claimed change. Even the sporbike tuners fight glitchy injection.
From what I've seen, the Yamaha YFZs are extremely competitive and pretty much have it all over the high tech Canondales. I spent alot of time dailing in the carb on my own quad and it really came down to a few little tweaks to make it outstanding. Maybe I don't know what I'm missing but I couldn't justify a large outlay and new learning curve to possibly get slight gains.
If manufacturers could come out with a system and keep the costs down and tuneable that would be great, I just think the hassle factor combined with costs are still to high for now for what can be gained. These systems still seem to be works in progress.
How many people are needing or getting such peak high tuned performance out of there quad that they need to spend over $1000 for an extra couple of ponies?
I don't mean to belittle what KMS is doing and this megasquirt system looks very promising to me.
I hope something like this is available as an alternative to Haltec or Motec controllers for fuel injected dunebuggy engines wher the controllers are costing as much as the salvage engines.

 

I will stick with a carb over the efi any day!!! efi comes with lots of trouble when things go bad ton's more sensors, relay's and wire's my buddy's cannonsdale is always messing up. plus then you have to worry about mapping the computer for the injector. It's best to keep it simple and fast!!! cannonsdales fall was because to many sensor's and electrical componets when they get exposed to all that bang and bumping around they fall apart. but i must say they do look awsome

 

These are all true statments, but you must remember that 85% of the quads running around are not tuned well. Most people will run on the factory jetting and it wont matter if thye live at 8000ft. and 100ft elevations. Almost every argument on this forum about "racing" brings up the "jetting issue" as an excuse for winning or loosing, and sometime rightfully so. EFI has much more potential to keep your engine at a better state of tune ,and do it with better consistancy vs. a carb. There are programmers that can "tweak" the mapping on a EFI for even better performance to a specific set-up, and it takes just a few minutes vs. hours and hours it takes to properly tune a carb to it best potential.

Also thier is the added benefit no more float sticking , or needle valved being clogged. The only thing that truley sticks about EFI is if your battery is dead, your screwed!!! no pull starting the quad to get back to camp[img]i/expressions/face-icon-small-frown.gif[/img]


bigger.