Would anyone buy a Turbo/EFI kit for the Raptor? This would make it a killer dune machine.

 

I agree and not.

I think that the "Next Generation Raptor" will have the EFI as standard equipment. It is the logical next step and is one way that Yamaha could justify a big price hike.

There are some big issues when turbo-ing for the Dunes. The sandrail guys have it all figured out.
But there's still that issue of turbo lag. The sandrails approach the "Hill", travel about 50 to 100 feet at full-throttle--THEN--the turbo kicks in, and all heck breaks loose. But you need the volume (and flow) of the exhaust to spin-up the turbo.

As reported by Raptor owners in this very Forum, the Raptor hunkers down and guts it out over the top in whichever gear that you hit the bottom in, ie.: first or second. I doubt if a turbo would be worth the money spent.

Flyin' Ryan

 

Turbo lag can be reduced and even eliminated. The European rally racers all run turbo cars, and when you're on and off the power as much as they are, lag is not acceptable. So what do they do to prevent it?

Basicly, the fuel injectors keep pumping a lot of fuel into the motor even when the throttle is shut off. The ignition timeing is delayed (by up to 40 degrees) so the charge ends up in the pipes without being burned. The spark plug fires after the exhaust valve has opened, causing an explosion in the exhaust. This keeps the turbo spooled up so full boost is avaliable as soon as the throttle is cracked open. The problem is that all of these explosions take their toll on the exhaust system, so anti-lag is only used sometimes.

Take a look at this page for more information: http://www.rallycars.com/Cars/bangbang.html

 

Why don't you guys swap in a 929rr engine instead of the weak 660 while youre at it ?!? . I don't believe you guys. You guys are riding in your brand new raptors while i'm rebuilding my sh%$^ty lt250r. If I had a raptor I'd shut my mouth and enjoy the ride.

 

Maybe I was a little bit harsh on you guys........I'm sorry for my last post(I'm just jalous of your rides)

 

sorry but edsmith is wrong. turbo lag is caused from an inproperly sized turbo and has nothing to do with when fuel is injected into the engine. electronic fuel injection is not nessary but highly recomended. carbs are very hard to setup and maintain the proper mixture in a blow through set up, and a pull through heats the fuel and the mixture has such a long distance to travel it's almost imposible to get the proper mxiture during acceleration.

you have to size the compressor and exhaust tubine housing to match the engine size&speed of the engine. then select the compressor impeller based on the realistic horsepower goal to be achived. then one must experiment with exhuast turbine impeller size to provide to the amount of boost needed at the proper rpm.

a waste gate is then used to blow off excess exhaust pressure based on manifold pressure. this ensures good quick boost with out over boosting at high rpm.

a pop-off valve is employed in the intake tube between the thottle body and the turbo so if the engine back fires through the intake the presure does not blow everything apart.

an intercooler or aftercooler as it's more proper refered to can be either an air to air or water to air type. the cooler is plumbed between the turbo and the throttle body, placed in a high air flow area on the vehicle. the air to air type is a small radiator w/oversize tubes that the boosted intake charge flows through and atmosperic air flows through the fins to cool the heated air from the hot exhaust driven compressor. the water to air intercooler uses an internal core that the pressurized air goes through and is surounded by liquid coolant(either plain water or ice water) which is circulated from a tank to the cooler. the water to air will produce far more horsepower than the air to air but add considerable weight and plumbing.

that's about it. i would recomend contacting turbonetics if you are serious about turbocharging, they can then steer you toward the proper turbo and a fuel injection specialist.hope i haven't scared anyone away from turbocharging, but if you employ all the components i've discussed and build the proper bottomend to handle the pressure generated on the top-end you will be more successful than anyone else i've seen with turbo quads in the magazines.if anyone wishes to challenge what i've stated feel free.if yu have any more questions feel free to ask maybe i can answer them.

 

What did I say that was wrong? If turbo lag is caused by an improperly sized turbo, than why can't top, factory backed rally teams get it right? You may have mis-read my post (it's a little confusing), I did not say that turbo lag was caused by the fuel injection. It can be prevented by altering the fuel injection and ignition timing, as a mentioned in the other post.

 

Ed,

I think he didn't understand you. What you say makes perfect sense! The turbo is powered by exhaust gasses, so the way to eliminate turbo lag or the lack of the turbo spinning fast enough to produce enough boost is to keep it spinning. By injecting fuel into the exhaust and effectively bypassing the engine with it, the turbo is continuously fed with exhuast gasses, almost like an afterburner on a jet. That's some really cool engineering to say the least.

I'm with you on this one 100% Ed. I believe he needs to rethink his post.

 

if you guys want to see serious turbo horsepower go to a national muscle car association NMCA street car drag race and watch 3400lbs cars run 6.70's at almost 210mph in the quatter mile. most of the top cars in the nmca are now running turbos. absolutly no lag there.

 

I hate to interrupt, but is there any rideability in a 100HP turbo EFI QUAD? Other than the dunes I mean? Its cool id say, but I just dont think may people would enjoy an arm jerker worth $12000 if they could only stand a few runs a weekend. And how Cool does it become when every one else loads up to go for a trail ride? Sorry but I for one would stand a properly set up 60HP quad, but only if it still was rideable everywhere. I dont see taking my all around good riding Raptor and Turning it into a oneway lightning bolt just for a few drags. But if thats all you ride Go FOR IT!
EFI Sounds great, if and when it works. But the turbo is a bit much. Just my $0.02