2012 Ski-Doo Summit SP

The Continued Evolution of the Species –


Summit SP? That’s the new name for the in-season Summit deep snow sleds from Ski-Doo. It had been called the “Summit Everest” but late last year Ski-Doo came out with the Summit SP. This late edition model filled the demand (both dealers and consumers) who wanted a sled more like the Spring-only Summit X models. The snowmobile industry is kind of different in how there are certain models that can ONLY be purchased in a pre-season offering. If a rider wanted a Summit X come November, December or January they were out of luck. They could get the Summit Everest or Summit Sport, but not an X. Enter the Summit SP.


Turns out the Summit SP offering made so much sense that Ski-Doo smartly dropped the Everest and replaced it with the Summit SP. Almost an X package, but not quite. You get Brembo racing style brakes with steel-braided brake line, the new Pilot DS skis and the narrow, low windshield, just like an X. And maybe the best part, it comes in traditional Ski-Doo colors so it clearly looks like a Ski-Doo, none of this blue Everest foolishness like last year.


Another reason Ski-Doo changed the name and re-badged the Summit SP was to draw attention to the significant changes made to the Summit line for 2011. The changes made so much of a difference that the new name would help reinforce the all-new character.


These changes to the Summit models were called the “S-36 Handling Package”. This combination of calibration changes was aimed at making the Summit sleds more agile – easier to tip up and hold a line – easier to sidehill – more maneuverable in deep snow. The inherent problem was the very low center of gravity of the XP platform; great for flat cornering on the trails but this low cg works against you when you’re tugging on the center grab bar trying to get the sled to tip up onto its side. Ski-Doo engineers tweaked several areas to make the Summit more maneuverable, going to a narrower ski stance, softer sway bar and longer center shock. The narrow stance made the sled easier to roll up for sidehilling and deep snow carving. The softer sway bar made it easier to initiate these maneuvers. The longer center shock aided in getting the sled to transfer weight better on acceleration to lift the front end. These changes, with the Pilot DS skis, really made the Summit act lighter and more agile, despite the low center of gravity.


Most notable is the addition of the Rotax 800R E-TEC engine package. The 800R E-TEC was rather limited last year, as it was truly stretching the capabilities of a two-stroke engine package operating at such high power levels on such small amounts of gas and oil. Now for 2012 some detail changes have been made to the pistons and cylinders to better handle the heavy load requirements that occur in mountain riding for even better durability. This engine produces over 162 HP and uses far less fuel than other 800s, a very important factor for many mountain riders. Just ask riders who run all brands side by side, day after day, and they will tell you the difference. Don’t believe anyone who tries to tell you one 800 gets better fuel range than the other due to riding style. There’s far more to it. E-TEC direct fuel injection gets better fuel economy than transfer port injection and throttle body injection; that’s a fact.


All of these models get the new-for-2012 REV-XP narrow seat with storage down under the rear of the seat. This new storage compartment is small, but you won’t know it is under there when sitting on the seat. It holds five liters of storage, that’s 1.3 gallons – big enough for a water bottle and a spare pair of gloves, way better than no storage at all.


If you want the absolute best in fuel economy and light weight, the Summit SP is the only Summit model offered with the 600 H.O. E-TEC engine. For lighter riders or not-so-high elevations, this is a capable sled with over 120 HP. It is offered with the 146” track length or the 154” track lengths.


All Summit SP models come with a PowderMax track with more flotation than the competition; these tracks are 16” wide so they have a larger footprint on the snow. They’re non-ported, with no holes in them like before, with a 2.25” lug height on the 600 and a 2.5” lug height (PowderMax II) on the 800s.


The 2012 Summit SP is a highly-refined deep snow machine, offered in two engine sizes and three track lengths. They give you the lightweight performance of a two-stroke with the fuel economy and lack of smoke/smell more like a four-stroke. Nobody else has DI engines like this. These are proven platforms, no first year bugs to work out. You don’t even have to sign up in the Spring to get a great sled, they’re on the dealer’s floors right now. The 146” E-TEC 600 sells for $10,149 with the 154” E-TEC 600 going for $10,499. The 800R E-TEC with the 146” sells for $11,499; the 154” for $11,849 and the 163” for $12,249.

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E-TEC Atmospheric Pressure Sensor (APS)

One of the sensors used by the Ski-Doo E-TEC direct fuel injection system is an atmospheric pressure sensor, or air pressure sensor. The air pressure is used by the ECM computer module to calculate the proper amount for fuel needed for the conditions (in addition to many other sensors).


The air pressure sensor on an E-TEC is built into the ECM module, and an air hose runs from the ECM to the air box. The sensor is calibrated to detect the pressure of the air box, so if this hose is disconnected, kinked or obstructed the proper air pressure will not be detected and the machine can exhibit poor performance and/or poor fuel economy. On any E-TEC machine that is not running properly, this air hose should be inspected for proper routing to ensure there are no obstructions or kinks in the hose, and that it is connected. This applies to all 600 and 800 E-TEC engine packages, all models.

To get all of the great articles and content from SnowTech Magazine you must be a subscriber to the print version. You can subscribe here. Or call us at 320-763-5411.

 

Boyesen Rage Cage RC2 Series

For 2012, Boyesen has released their new Rage Cage RC2 Series Reed System. This updated version of the popular Rage Cage now features a sophisticated array of performance attributes designed to provide peak horsepower gains, durability, and model-specific performance for each make/model/year sled.


What makes the Boyesen reed cage design special? It’s the only performance system with aerodynamic internal surfacing – Boyesen calls this “Aero Optimized Internal Surfacing”. A precision surfacing treatment on the interior of the cage eliminates all hard edges that interrupt with the delivery of air and fuel. Because internal air turbulence is virtually non-existent, the proper air/fuel control is optimized. This attention to the specific air and fuel requirements of each sled gives the RC2 Series Rage Cages the ability to reach consistent peak horsepower gains, optimizing power delivery for each specific application. This is not a one-size-fits-all design.


The RC2 Series Rage Cage now features category-leading toughening additives to increase reed petal lifespan by resisting breakdown from damaging agents found in fuel. In addition to their proprietary T2 Epoxy, the Rage Cage features rubber coated reed petals to ensure a long-lasting seal between the petals and the intake tract. You will enjoy the durability of the Rage Cage season after season.


Another unique feature is the model-specific variable-tension reed petals using X Cross Dual Carbon. The Rage Cage’s multi-staged reed petal stacks feature carbon material interwoven into tension combinations that maximize power delivery and peak horsepower. Boyesen engineers specifically tune the carbon matrix tension using a proprietary weave formula that is tested and optimized for each model sled. Call it a “carbon sandwich, with the carbon reeds sandwiched in-between two layers of pre-loaded reeds for a calculated response.


Why three reed layers? The reed petals in modern snowmobile engines take an incredible amount of abuse. At peak RPM reed petals are opening and closing hundreds of times per second. Over time, a single reed loses its ability to regulate flow rates in proper proportions. This causes a loss of reed petal reaction and reduces the consistency of peak horsepower.


Boyesen’s “MS PLUS Optimization” uses multi-staged reed petals to distribute the engine’s pulse forces over more surface area. By using a multiple reed petal stack, it is possible to achieve peak horsepower and durability. The patented multi-stage design incorporates a specially shaped top reed petal and a ported bottom reed petal. The top petal is lightweight and resilient for crisp throttle response at partial throttle or low RPMs. The stiffer, bottom petal is ported to provide maximum flow and horsepower at higher RPMs.


The dual-stage design also allows you to replace your stock reed stop with a Rev-Plate which permits the petals to open freely and function efficiently.


Multi-stage reeds work in unison to perform efficiently throughout the entire powerband. The difference in stiffness between the top petal and the bottom petal allow the reeds to respond quickly and accurately to changes in engine pressure. This translates into quicker acceleration, crisper throttle response and increased horsepower throughout the powerband.


We’ve never been disappointed when we install a set of Boyesen Rage Cages into one of our sleds. You notice and feel the difference, and they last. They’re sold through many snowmobile dealers and distributors. To check applications visit
www.boyesen.com

To get all of the great articles and content from SnowTech Magazine you must be a subscriber to the print version. You can subscribe here. Or call us at 320-763-5411.

 

Drive Belt Cleaning

Clean belts and clean clutch sheaves allow the sheaves to better grab the belt with less slipping, that’s less friction and heat. Logically we want to keep the drive belt and clutches free of oil, or any residuals that promote slippage instead of traction.


One question that often comes in is on cleaning drive belts. We’ve always followed the logic of no chemicals, using only a ScotchBrite pad in hot, soapy water. Soap? Something like Simple Green works well. You can scrub the belt clean, roughen up the glazing, get rid of the mold release (on new belts) and make them as good as possible. Do it to the sheaves as well, if needed, to clean away any petroleum or rubber residues that would take away from efficient power transfer. This is also a good time to closely inspect the belt for cord separation, layer separation, or any deformities in the power-transferring surfaces that are not supposed to be there.


Some guys swear by certain cleaning solvents, but we’ve always been of the following of not getting the petroleum-based chemicals into the drive belt and clutch sheaves. You should be able to remove any residues with a scouring pad and a good water-based soap cleaner and keep the system clean.

 

More Runners

Dear Ralph:
I love your magazine. I had a 2006 Ski-Doo REV 600 SDI Renegade with 5.7 Pilot skis. Each ski had two wear rods, one in the center and one on the outside edge. I just bought a 2012 Ski-Doo 600 E-TEC Renegade Adrenaline XP with 5.7 pilot skis, but it only has 1 wear rod down the middle. Will this sled handle the corners alright like this? The skis can have holes drilled in them on the outside edge so I can install wear rods. Do I need to do that?
Larry Carlson


Generally, an XP with one runner (per ski) handles like a REV did with two runners per ski. The rider positioning of the XP places more weight on the skis than the REV chassis does so it doesn’t need the extra runners to give you the same steering response. If you add the two outer runners to the XP skis (we tried it when the XP first came out back in 2008) it will make the sled turn even harder – steering effort increases.
I highly doubt you will find the Renegade lacking in handling capability. Try the sled as it is delivered and then make adjustments based on what doesn’t suit you. If you do want even more cornering bite simply install more aggressive runners in the center. I would not install the extra set of runners, we’ve found that to be too much.