Turbo Yamaha Snowmobile
 

Hey guys, I have been looking around this site and found a lot of good info. I am currently building a Turbo Nytro Snowmobile, I figure it is a lot like a bike so I thought I would post my progress.

Maybe you can give me some tips this is my first build.

I have not gone too far yet:

1000 cc engine with fuel injection
I have an evo III turbo
intercooler with greedy bov
piggy back fuel controller (i may go a different route)
I will be going with 2" charge tubes (i think that will be good?)
its a rear mount so I will add a scavenge pump
Im gonna start at 6 PSI (this is all the stock pump and injectors will handle) then I want to go to around 10 PSI with either added injectors or just bigger injectors

still in the design phase but wanted to post some stuff up for input

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another shot

should be one bad ass snowmobile. i would keep it to a max of 6 psi. anymore than that and you will need low compression pistons, an intercooler or meth injection to cool down the charge. since its a cold weather toy you maybe able to get away with more boost without an intercooler but i wouldnt risk it.

i would go with an extra injector controller instead of the piggy back. its going to be a low boost build so timing wont be an issue. this way you can use the stock fuel injecton under n/a and then the extra injector controller adds fuel when it see boost.

Thanks for the input, 6 psi puts it around 180 hp at the crank...not too bad haha. I have read some posts about the UDR AIC-6 extra injector controllers, I left a message with tech support but have not heard back. Any thoughts about using that on a snowmobile?

I do have an intercooler too. Im not sure I want to tear into the motor yet though. haha.

that is the exact injector controller i am using on my turbo car. simple wiring. power, ground, tps signal and connect a vacuum line to the controller for boost reference. it will work fine. it uses standard bosch style injectors.

using the intercooler for 6 psi or less will be fine. an intercooler is better than no intercooler.

nice

I wonder if the TPS is going to work on the snowmobile or if it is car specific?

your only tapping into the signal wire of the tps on your snowmobile. all tps sensors work the same.

ok, I was wondering about that. good info thanks.

Take a look at the MCX 180 kit for the nytro. Stock fuel pump is used in the 240hp kit with a set of umbrella injectors. I have installed the 180(6psi), 240(12psi) and 270(16psi) kits from them. the 180 kit doesn't use an inter cooler, the response is quite a bit quicker than the other two that do have an inter cooler. If you have a 2009-2010 nytro use the yamaha 8bu weights, two 17mm steel rivets in each and 14.5mm rollers with stock clutch springs, works just great with the 180 kit, and you don't have massive weights that have a hard time back shifting like with the other levels of hp.

i was contemplating not using an intercooler for response... I will keep it around 6 psi anyway. My nytro is a 2008.

Im used to the ski doo clutching, Im new to yamaha. According to the manual there are two different weights on the steel rivets. Is it the 3.6 oz or 4.5 oz?

Im getting close with this thing. Another good day and I will be just about done.

awesome. what fuel control did you end up going with? add more pics. cant wait to see vids.

i ended up scrapping the intercooler and using a charge box. I think with the low temps in the winter and only running 5-6 pounds boost I should be good.

I used a fuel controller for a snowmobile its GEMs piggy back adds fuel under boost only.

that will work. when is it time for the test ride? cant wait to see this. please tell me you have a camcorder?

I will work on a video, we prob wont have snow here for a few weeks though. I'm pretty pumped to get it going.

This is a great site, it's a lot more fun to see what everyone is building then to look at a kit that someone bought.

we are using the heavy rivets, your going to have to experiment though
8bu in this list:
http://www.cbperformanceparts.com/pr.../?pcid=196#top
you don't need to use the 14.5mm rollers, but the engagement rpm is a little high without them.

6psi is pushing the stock injector's capacity to the max remember. What are you doing for oil scavenging? Remember the oil pressure port by the sending unit on the block is 1/8-28 BSP, not 1/8th npt. You can however run a BSP die over a NPT fitting and it makes it work.

I have not picked the scavenge pump. I see powderlites offers a reasonably priced facet pump unit but I am worried about reliability. I dont see myself dropping $500 for the MCX mechanical pump.

I actually ordered the oil fittings today from a shop in the UK they were not easy to find.

I will be in the 5-6 psi area for boost keeping it on the safe side.

Thanks for the help.

Lovin this build.

thanks man.

So i started the motor today.

Changed the oil, topped off the coolant and ran it.

I need gauges so I have not actually moved it but it ran. It is a little louder than I hoped but I have not put the seat and heat shield over the muffler yet.

Stil waiting for snow........

damn you!!!! i want to ride it too!!!!!!!!!!!!! that looks like one hell of a fun ride.
you dont have to wait for snow. put some paddle tracks on it and ride it over a pond/small lake... :)

so I could not wait for snow, I took it in my moms field on the grass. It ran well, I am excited for sure. It hit 6 PSI boost in no time. I have a question, the BOV did not seem to open at all. I have a older Greddy RS valve, anyone have experience with these? I have it real lose but no whoosh when I let of the throttle.

you need to adjust the bov spring rate. the bov should be closed at idle vacuum and open at closed throttle load vacuum. when you close the throttle under boost the vacuum signal will spike over the vacuum signal you would get at idle. this is the only time you want the bov to open. if its not opening then you need to replace the stiffer spring with a lighter spring.

I think it needs a new spring, it is loosened out pretty far.

you may have to order lighter springs from greddy or try and cut the spring.