Haven't been on here in a while, just wondering if any new info or products available for the new D8? I am most curious if anyone has or is making a set of twins and how they will react vs single? I seen the SLP made some for the mountain sleds but they must run on a race gas mix?

I was thinking of a little Flannery port job, pipe(s) and maybe a small shot of juice? Is HTG or anyone else making aftermarket cylinders yet? Anybody have much luck running two-stroke turbos on pump gas and truly trail riding them at sea-level? I don't really want to sacrifice realibility much.

Snowest is where you want to go to look for turbo info. the mountian guys have been running them for quite a while. There is a saying about turbo charging a two stroke.. drop a hundred dollar bill in the toilet, and flush it. If it doesn't bother you do it again. if it still doesn't bother you, then you are ready to run a turbo 2 stroke

Krom,

Thanks for the reply. I checked snowest and it sounds like fuel is a big thing with these 2 stroke turbos. Anybody else hear anything on pipes for these sleds?

Carl's cycle has an 860 bb kit with aftermarket cylinders. Of course he doesn't dyno his motors, so no numbers. HTG had there 830 bb/stroker kit on a 600 in the old forge shoot out last year, and that had twins on it, so they might have something for this 800. HTG probably won't get into it too much until the short track is released, since they don't do a heck of alot with mountain guys.

Carl's doesn't need to publish HP numbers with the reputation they have IMO. You can bet any motor you get from them will run hard(if the rider/tuner knows what he's doing).

That is his thinking too, and i agree he has a heck of a reputation, although numbers sell. He does sell alot of motors to the guys out west that know his reputation, but for a new comer looking for a big bore that doesn't know his reputation, they have nothing to go off of. I personally would like to see what power his motors make compared to other companies too, since i've heard of a couple guys that compared other company's ported cylinders to carls down here at sea level, and the other company's cylinders performed a little better. I think carls uses a little different porting specs than other companies, that works good for the mountains, but not as good down here. Kinda like how mountain guys don't go for HTG stuff so much, but around here it's fairly popular. I've heard of some guys with HTG stuff in the mountains that didn't run well.

You are spot on there 1fastxc, I agree.

Any power enhancement you do will sacrifice reliabilty to a certain extent. In addition, big bore kits or porting typically use more fuel. Not the best scenario today. Nitrous is an option, but still requires heavier clutching, good fuel and caution.

IMPO, the turbo is really a great choice for variable power, good fuel economy, stock components, etc. I've been trail riding 2-strokes at 5-7 psi boost on pump premium fuel at sea level for 20 years. You can even reduce boost to zero for poor fuel operation. Yes, when under boost you have to pay attention to fuel quality and jetting, but, this is true for any sled. Best of all, you can take the turbo off and return the machine to stock very easily.

However, it's not for the novice mechanic. There are certain items that require added attention. An EGT system is highly recommended to monitor fuel system performance and jetting. The fuel delivery system must be adequate and correctly set up. Exhaust leaks can be harmful to response. Clutching is not as straightforward as with naturally aspirated. Too much boost for the fuel quality being used can be catastrophic.

If you are going to run a turbo it all depends on where and how you are riding. If you are in the tight and twisty forget it and go with a bb, but if you are doing long shoots out west then that turbo will have longer legs. Guys out there run them due to the alt and low air. At sea level run a bb. In talking with 1200psi he had lots of interesting things to say btw a bb and a turbo. He has always run a 1200wc and this year did a 700 turbo, both in the IQR. He says the turbo will out run that 12 but in the trees the 12 has the advantage. He will stay with the turbo to keep the weight down. You loose 3%hp for every 1000'; thus out west at 10,000' they have 30% less than here at sea level. Flannery does great work but doesn't give a shit about you or your sled, just my personal experience.

I believe you meant 30% less hp at 10,000 ft, not 30 hp. Interestingly, a turbo is excellent in the trails. Because the heat is already built up in the pipes, boost is nearly instant, and mileage is same or better than stock. 1200 WC will get about 5 mpg in the trails.

Sorry ment 30% less hp but on a 1200wc that is up to 75hp difference, I don't care who you are that is a shitload. I am hoping to get 7mpg next year, (how would all those bitchers about mpg on the dragons like that, lol). I am going to run 40 or 42mm racks for trails and saving the 48 lectrons for racing. I can take the wife's switchback for longgg rides. If he is an experienced tuner then run a turbo but most are not there yet, esp since most kit are newer and ment for alt. I am only interpreting what I have read on snowest and brad as far as 2-stroke turbos go, only seen the yamis with whistles run here at sea level and they are very beatable in shorter races. On a promising note for anyone that is into ice racing I just read that a guy on amsnow got 427hp and 273 ft/lbs torque out of a 09 doo 1200 4 tec with a turbo at dynotech and they had 50hp to go, that is impressive. He best hit the gym all summer to hold on, lol

I am not doubting you, I just don't understand how that is possible.

I should have added "when cruising". Of course more hp at WOT requires more fuel.

The turbo actually aids the engine in pulling air into the crankcase at cruising speeds due to slightly increased atmospheric pressure. If correctly jetted, this can improve mpg.

But, what other hp adder, except maybe nitrous, can increase hp 40-50% safely on pump fuel, and still not reduce cruising fuel economy.

A turbo provides "variable hp/displacement due to compressing/inducting additional air mass and is totally adjustable from the handlebars, if desired.

The fastest turbocharged drag racing machines use a turbo and nitrous. It's almost like a "nuclear reaction".

Patriotic,

Who would you suggest for turbo kit?