Evolution Powersports BIG CHUTE 7000 TURBO

In an effort to continue to push the envelop on 4 stroke turbo snowmobiles,
Evolution Powersports is proud to announce that we have completed the fabrication and electronics for the first of a whole line of No Compromise Yamaha VIPER / ARCTIC CAT 7000 Turbo kits. The Arctic Cat version is called the BIG CHUTE 7000 TURBO.

The heart of any great turbo system is the turbo and fuel/boost management system. Our turbocharger is a TiAL/EVOPS Billet Wheel IHI Turbo which is capable of 400+ hp. These are the same turbos that are dominating the Arctic Cat 4 Stroke mountain and drag race markets throughout the US and Canada. This turbo, despite its high maximum power potential, lights up instantly. Our electronic package consists of an EVOPS spec altitude compensated boost/fuel controller that is light years ahead of the currently available options on the market. Our controller allows us to scale up the fuel injectors to allow more fuel without affecting the off boost fuel mapping. We also re curve the stock timing map to make it more boost friendly and lowering octane requirements. The timing re curve also removes the need to install a head shim at this power level.

There are a few items not shown - our fuel controller, water lines, clamps, etc. As stated earlier, the water lines and charge tubes will be made from custom molded silicone.

The intake has frogskinz on 3 sides (not on the top) as well as a filtered reed valve as part of this system that is further upstream which allows the engine to breath even if the entire intake was 100% covered in ice. We closed off the top to keep the engine from breathing the hot air coming off the radiator.

We prefer to engineer solutions that do not involve cutting factory plastic or altering the exterior in any noticeable way. For example, our heat exchanger for the water to air is a billet machined part that will bolt directly in place of the access panel below the engine. It will not require any modification to the belly pan. The oil filter is still accessible from the mag side of the engine.

All of the factory heat shields for the breather, etc remain in tact. The exhaust uses all factory mounting locations. The turbo hangs on a direct replacement horizontal spar that is made from chromoly rather than aluminum.

We will continue to push the envelop on 9000/1100T now that we have a handle on the drive line issues - MORE POWER and LOWER FUEL REQUIREMENTS - Stay tuned.


The kit also features:

• WATER TO AIR INTERCOOLING with BILLET machined heat exchanger
• LARGER FUEL PUMP
• COLD AIR INTAKE WITH REED VALVE BYPASS
• STAINLESS STEEL EXHAUST
• SIMPLE INSTALL
• 550 CC DROP IN REPLACEMENT INJECTORS
• NO TUNING REQUIRED
• CUSTOM SILICONE INTAKE, CHARGE TUBES AND WATER LINES

More details will be released in the coming days and weeks.

martin1200 said:

price on this kit

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It will be in the 5-6 k range.

Here are more pictures of the kit with body work installed. Note the smooth bend coming from the factory header pipe into the turbo. We worked very hard to make sure the turbo was placed so that this was a clean transition. It is very important for turbo spool and efficiency to enter the exhaust housing as straight as possible. Also note the factory heat shield for the antifreeze fill and oil breather are in tact. The front bottom of this shield will require minor modification for the waste gate actuator. Beyond that, the kit is almost 100% bolt in.

nosajlleb said:

Does this have one of those fancy brv's? If not why?

Sent from my LG-LS696 using Tapatalk 2

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Good observation! - the pictures do not show a BOV, but it is part of the package.

d1100t said:

Gene,
Do you know which way they are panning on going with this kit?

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More details regarding horsepower levels, fuel requirements, ect will be released soon.

It sounds as if Arctic Cat may make a 7000 162 after all!!!

The Big Chute 7000 Turbo is going on the dyno this week. Fuel requirements and Horsepower will be posted very soon.

We will be datalogging and knock sensing with some very high tech tools in order to extract the most safe hp possible from this engine. We have extensive background with the Nytro engine due to work we did in developing ECU tunes for that vehicle.

We will also release some unique qualities about our water to air intercooler which adds virtually no additional weight to the machine.

A couple of other notes - We have mounted the turbocharger fairly low in on the right side of the chassis. We did this for a few reasons. First, it was the only way to get a nice smooth transition from the header pipe into the turbo. Second, keeping the center of gravity low was extremely important to us. One of the complaints that a few customers have about the 1100T is that it feels somewhat top heavy in setup conditions. A turbocharger and associated harware weigh approximately 20 lbs. Machines with a low center of gravity tend to handle better and easier than top heavy machines. Also, our muffler, because of its shape also keeps the CG low. It is very quiet as well. We will probably have a straight pipe option for those who want it loud.

This kit is the first of a family of turbo kits for this machine. We did NOT want to run a head shim on this kit - we want the compression in the motor in order to keep the normally aspirated throttle response. The higher compression also lights up the turbo better. Low compression motors can make more hp on pump fuel, but with timing control we can equalize this a bit. The last thing we wanted to do was create a machine with a soft throttle response or one that was laggy at elevation. As altitude increases, turbo lag increases. Low compression motors become less and less responsive at higher elevations. We generally ride at 8000'-11,500'. Our experience with the 1100T showed us that a 9:1 compression motor allowed us to make really good hp, but sacrificed the ability to pick the skis up when jumping creeks, change attitude with throttle while jumping, etc. On the 1100T, we were able to overcome this a bit with Launch Control, but we believe a higher compression motor makes a better mountain sled.

This is not really relevant to the mountains, but shows the potential of the turbocharger we have selected - Kyle Shilts took second place this weekend in the Cable, WI trail class drag races. He finished neck and neck against his uncle Kelly Shilts who was running basically an outlaw class 500+ hp sled. This turbo maxes out around 41 lbs of boost and 400 hp at sea level. We should have no problem making 350+ hp at high elevation.

high time said:

You know you're working on my next sled.

The future is in your hands. I think there will be lot of guys on these in the years to come.

Owen

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Sounds good Owen! The BC Viper/7000 is going to Jackson Hole next week for on snow testing and racing.