Arctic Cat ZR / XF / M 9000 Turbo / Yamaha Sidewinder Technical Information & Videos | Speedwerx Inc.
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Many of you have been anxiously awaiting more information on our Arctic Cat 9000 / Yamaha SideWinder 998 Turbo ECU mapping, and after a considerable amount of dyno and field testing we have some details to share on the three Pump Gas / Trail maps that will be available this season-
RPI-9000-1 Stage 1 Stock Exh. (220.8 hp*)
RPI-9000-2 Stage 2 91 Octane (254.2 hp*)
RPI-9000-3 Stage 3 91/110 Blend (271.6 hp*)
A Knock Light is a standard feature on all of our maps to give you a little more peace of mind and a safety margin should you get some low quality fuel. Extensive work went into the OEM knock detection feature to make this work better in high boost applications so you will have the safest and most reliable system available to give you a little more peace of mind and a safety margin should you get some low quality fuel. It's simply incorporated into the mapping to appear on factory digital display for a true plug and play installation without the need for external lights or wiring scroll down to see a quick vid of it in action.
These maps were developed for Speedwerx by Precision EFI and we have the exclusive rights to market them to consumers, dealers, and performance shops. A Flash Tool for dealers or shops to install the maps in-house on a pay per license arrangement will also be available. Serious tuners can also purchase the Multi-Map Bundle + Dash Upgrade to have the ability to switch maps using the stock digital dash display at any time. Any dealers interested in getting setup to flash ECU’s should contact Doug at 651-982-6020 or dtoepper@speedwerx.com.
RPI-9000-FT Flash Tool
RPI-9000-MB Multi-Map Bundle + Dash Upgrade
*Please Note: the horsepower ratings as stated are in hot and humid August air- the Stage 3 will make around 280hp in cool, dry winter air.*
Speedwerx ECU Maps tested at DynoTech Research!
Billy Howard from our Eastern Distributor Howard’s Inc. brought his machine to DynoTech Research where they ran the three maps in addition to the stock baseline and our Stage 1 muffler that does not require an ECU remap- here’s Jim’s write-up with the results and some notes and tech info.
2017 Arctic Cat Thundercat turbo, tested with Precision EFI Stage Tuning and Speedwerx Mufflers
Billy Howard of Howard's Inc Kubota, SkiDoo and Arctic Cat (and Speedwerx distributor) in Coudersport PA brought this low mile stock 2017 Arctic Cat Thundercat turbo to DTR to test Speedwerx mufflers and the anxiously awaited Precision EFI pump gas ECU reflashes. Speedwerx would like to provide this technology to its distributors, dealers and customers, and are working on a marketing plan with Precision EFI.
Sebastien Guay, owner of Precision EFI, spent his early years first doing the Advanced Certification program at EFI University in San Diego, then spent several years in New Zealand working with, and finalizing the development of the VI-Pec standalone EFI system (the preferred standalone used by Hypersports, BMC, D&D, Speedwerx on their X-Games winning supercharged 800 Cat twostroke, and many others). In 2009, Sebastien came back to Canada with fully developed VI-Pecs to market and opened Precision EFI at the Autodrome Saint Eustache racing facility in Quebec, north of Montreal. The facility is set up with a complete fabrication shop, all wheel drive chassis dyno and a fully instrumented engine dyno for building and tuning high end EFI race cars that are run at the Autodrome. They also have a snowmobile chassis fixture for instrumented crankshaft dyno testing like we use at DTR that they use for snowmobile VI-Pec and factory ECU tuning. Today, an important part of Precision EFI's business is marketing/ tuning VI-Pec standalone ECUs in North America and cracking and retuning automotive and powersports ECUs.
These three reflashes were developed first on Precision EFI's fully instrumented engine dyno, then field tested last winter in Canada on Thundercat/ Sidewinder beta test trail sleds. Factory detonation protection is surely adequate for normally aspirated operation, but marginal for boosted operation on pump gas, hence the need for extensive field testing prior to release. Precision EFI has reconfigured the digital dash display to include a knock light that will warn the rider of any possible detonation when operating on occasionally inevitable low octane fuel or in abusive, harsh conditions (scroll to the bottom to see a demonstration video of the knock light). They also have developed an electronic box to be used by distributors/ dealers for installing these totally encrypted reflashes over the internet on a pay per license arrangement.
Billy had with him two Speedwerx stainless quiet mufflers—one 2.25" ID and the other a higher flowing and just slightly louder but easily “trailable” 2.5" ID. We tested the fuel in the tank with our Zeltex 101C octane/ ethanol % tester, and it was 92.2 R+M/2 octane with 3.3% ethanol.
At the beginning of the test session, the air was hot and humid. The Thundercat EFI will adjust fuel flow to compensate for changes in temperature and barometric pressure, but can't measure humidity with its speed density system. So the water in the air displaces O2 with no change in fuel flow, resulting in slightly richer mixture and reduced HP. Note that the stock fuel curve leans out mixture as revs climb beyond peak HP RPM. Based up on their own winter air dyno testing, Sebastien had expected HP to be closer to 280, and plans to return after optimal cold weather has arrived in WNY. The DTR refrigerated intake air system can provide 1000 cubic feet of dry winter air in August, but our experience using that system on our first preproduction Sidewinder showed the stock intake air thermocouple is too slow to react to the sudden 60F drop in intake air temperature during the 10 second transient dyno test —causing leaner-than normal A/F ratio. We had the same experience with the plastic coated SkiDoo Etec intake air temperature sensors, and now use one with plastic carefully removed exposing the metal element when testing with winter air in summertime. With that, the BUDS shows intake air temperature drops as quickly as our rapid response custom SuperFlow intake air temp sensor.
Stock baseline in 75.8% humidity, .75 in hg vapor pressure air
EngSpd STPPwr STPTrq BSFA_B FulA_B LamAF1 ElpsTm BoostP FulPrA
RPM CHp Clb-ft lb/hph lbs/hr Ratio Secnds psig psig
6500 158.7 128.3 0.465 66.6 12.45 0.57 7.9 52.1
6600 159.7 127.1 0.470 67.6 12.36 1.04 8.0 52.2
6700 160.5 125.8 0.470 68.0 12.26 1.40 8.0 52.2
6800 161.4 124.7 0.467 68.0 12.16 1.75 8.1 52.2
6900 162.6 123.8 0.465 68.1 12.10 2.10 8.1 52.2
7000 163.8 122.9 0.460 67.8 12.06 2.46 8.1 52.2
7100 165.1 122.1 0.458 68.1 12.04 2.80 8.2 52.3
7200 166.7 121.6 0.460 69.1 12.03 3.09 8.4 52.5
7300 169.2 121.8 0.466 71.1 12.05 3.40 8.7 52.9
7400 173.6 123.2 0.474 74.1 12.09 3.79 9.2 53.3
7500 178.9 125.3 0.476 76.6 12.12 4.14 9.7 53.7
7600 183.5 126.8 0.474 78.3 12.09 4.49 9.8 53.8
7700 186.8 127.4 0.479 80.5 12.01 4.88 9.9 53.8
7800 188.8 127.1 0.482 81.9 11.94 5.18 9.9 53.8
7900 190.2 126.4 0.488 83.4 11.87 5.53 10.0 53.9
8000 191.5 125.7 0.492 84.7 11.79 5.88 10.0 53.9
8100 192.9 125.1 0.493 85.5 11.74 6.22 10.0 53.9
8200 194.0 124.3 0.495 86.3 11.74 6.57 10.1 53.9
8300 195.3 123.6 0.493 86.6 11.77 6.93 10.1 54.0
8400 196.9 123.1 0.489 86.5 11.84 7.18 10.2 54.0
8500 198.2 122.4 0.485 86.3 12.00 7.57 10.2 54.1
8600 200.1 122.2 0.481 86.4 12.03 7.91 10.2 54.1
8700 201.7 121.8 0.481 87.2 12.01 8.23 10.2 54.1
8800 202.2 120.7 0.486 88.2 12.01 8.61 10.2 54.0
8900 201.5 118.9 0.488 88.3 11.97 8.97 10.2 54.1
9000 199.3 116.3 0.486 86.8 12.07 9.31 10.4 54.2
9100 195.9 113.1 0.476 83.5 12.61 9.68 10.5 54.4
9200 189.3 108.1 0.459 77.8 13.54 10.19 10.7 54.6
Leaving the stock ECU in place, we installed the Speedwerx 2.25" muffler. The reduced backpressure allowed a bit more boost pressure that the ECU compensated for-- delivering additional fuel flow. Also, note the Elapsed Time of the first two tests which is virtually identical--critical in ensuring perfect repeatability during transient testing with any dyno. The SuperFlow 902 water brake absorber with new style PID controller gives us this identical rate of engine/ absorber rotor acceleration.
Stock ECU, Speedwerx Stage 1 Muffler
EngSpd STPPwr STPTrq BSFA_B FulA_B LamAF1 ElpsTm BoostP FulPrA
RPM CHp Clb-ft lb/hph lbs/hr Ratio Secnds psig psig
6500 163.8 132.3 0.458 67.6 12.52 0.59 8.6 52.7
6600 164.8 131.1 0.457 67.9 12.40 1.01 8.6 52.7
6700 165.5 129.7 0.459 68.5 12.28 1.41 8.6 52.7
6800 166.7 128.7 0.452 67.9 12.22 1.78 8.6 52.8
6900 168.0 127.9 0.446 67.4 12.17 2.12 8.6 52.8
7000 169.1 126.9 0.447 68.0 12.11 2.49 8.7 52.8
7100 170.4 126.1 0.447 68.6 12.07 2.82 8.8 52.9
7200 172.2 125.6 0.455 70.6 12.07 3.11 9.1 53.1
7300 175.5 126.3 0.470 74.3 12.09 3.42 9.7 53.7
7400 181.0 128.5 0.481 78.4 12.10 3.74 10.4 54.3
7500 188.4 132.0 0.481 81.6 12.11 4.10 11.0 54.9
7600 195.4 135.0 0.475 83.5 12.10 4.46 11.4 55.3
7700 200.9 137.0 0.470 85.0 12.02 4.83 11.7 55.6
7800 204.5 137.7 0.470 86.6 11.91 5.18 11.7 55.6
7900 206.0 137.0 0.476 88.3 11.78 5.53 11.7 55.5
8000 206.8 135.8 0.486 90.5 11.66 5.93 11.7 55.5
8100 207.9 134.8 0.491 91.8 11.59 6.24 11.7 55.5
8200 208.4 133.5 0.496 93.0 11.52 6.56 11.8 55.4
8300 209.3 132.4 0.502 94.6 11.50 6.89 11.8 55.5
8400 210.8 131.8 0.507 96.0 11.54 7.22 11.9 55.5
8500 212.6 131.4 0.506 96.7 11.60 7.57 12.0 55.6
8600 214.5 131.0 0.503 96.9 11.63 7.89 12.0 55.6
8700 215.8 130.3 0.502 97.3 11.63 8.27 12.0 55.6
8800 216.7 129.3 0.501 97.6 11.61 8.63 12.0 55.7
8900 216.1 127.5 0.509 98.7 11.56 9.00 12.1 55.8
9000 214.1 124.9 0.515 98.9 11.62 9.34 12.2 55.9
9100 211.9 122.3 0.509 96.8 11.91 9.65 12.3 56.0
9200 205.3 117.2 0.493 90.8 12.68 10.19 12.2 56.1
Reinstalling the stock muffler, Sebastien installed a "Stage 1" reflashed ECU. This gave us an extra 1.5 psi of boost, and a nearly 20hp increase over stock with even safer A/F ratio than stock.
Precision EFI Stage 1 Tune, Stock Muffler
EngSpd STPPwr STPTrq BSFA_B FulA_B LamAF1 LM1Air Boost FulPrA
RPM CHp Clb-ft lb/hph lbs/hr Ratio SCFM psig psig
6500 169.0 136.5 0.442 68.7 12.57 203 8.8 53.7
6600 169.3 134.8 0.442 68.9 12.40 201 8.7 53.7
6700 169.4 132.8 0.446 69.5 12.25 200 8.7 53.7
6800 170.2 131.5 0.447 70.0 12.18 201 8.7 53.7
6900 170.8 130.0 0.447 70.1 12.11 200 8.7 53.7
7000 171.8 128.9 0.448 70.8 12.08 201 8.8 53.7
7100 173.6 128.4 0.453 72.3 12.07 205 9.0 53.9
7200 176.1 128.5 0.459 74.3 12.04 211 9.5 54.4
7300 181.3 130.5 0.461 76.7 12.06 218 10.3 55.1
7400 188.4 133.7 0.460 79.6 12.08 227 10.9 55.6
7500 195.8 137.1 0.460 82.8 12.08 235 11.3 56.1
7600 201.8 139.4 0.461 85.4 12.06 243 11.6 56.4
7700 206.3 140.7 0.463 87.7 11.99 248 11.8 56.6
7800 209.0 140.7 0.465 89.3 11.87 250 11.8 56.5
7900 210.3 139.8 0.469 90.6 11.74 251 11.8 56.4
8000 210.8 138.4 0.475 91.9 11.58 251 11.8 56.4
8100 211.6 137.2 0.478 92.8 11.53 252 11.8 56.4
8200 212.1 135.8 0.487 94.7 11.51 257 11.9 56.5
8300 213.6 135.2 0.491 96.1 11.52 261 11.9 56.6
8400 215.4 134.7 0.491 97.0 11.55 264 12.0 56.6
8500 217.4 134.3 0.496 98.8 11.64 271 12.1 56.7
8600 219.5 134.0 0.499 100.3 11.65 275 12.1 56.7
8700 220.4 133.0 0.500 101.0 11.60 276 12.1 56.6
8800 220.8 131.8 0.497 100.5 11.57 274 12.1 56.7
8900 220.3 130.0 0.494 99.6 11.55 271 12.1 56.7
9000 219.5 128.1 0.490 98.4 11.59 269 12.2 56.7
9100 216.8 125.1 0.482 95.7 11.90 268 12.2 56.8
9200 214.2 122.3 0.471 92.2 12.37 269 12.3 56.9
Next, a larger but still quiet 2.5" ID Speedwerx stainless muffler was installed with an ECU with Precision EFI Stage II tune. This brought boost up to 14psi, and with still safer-than-stock A/F ratio generated well over 250hp. Note that the Precision tuning eliminates the gradual leaning of mixture as revs climb toward the 9200+ rev limit— something critical when running "out of gear" on the lake and having revs climb toward the rev limiter. Remember the factory deto protection may be adequate at stock HP levels but may lack the extreme, rapid reaction (fuel enrichening and timing retard) necessary to protect the engine properly from detonation at 250+ HP.
Precision EFI Stage 2 Tune, Speedwerx Stage 2 Muffler
EngSpd STPPwr STPTrq BSFA_B FulA_B LamAF1 LM1Air Boost FulPrA
RPM CHp Clb-ft lb/hph lbs/hr Ratio SCFM psig psig
6500 175.2 141.6 0.462 74.4 12.55 220 9.3 54.3
6600 177.2 141.0 0.469 76.4 12.42 223 9.4 54.3
6700 178.7 140.1 0.476 78.2 12.30 226 9.5 54.3
6800 180.6 139.5 0.480 79.7 12.22 229 9.6 54.5
6900 183.4 139.6 0.485 81.7 12.18 234 10.0 54.8
7000 187.8 140.9 0.484 83.6 12.12 239 10.4 55.2
7100 192.7 142.5 0.484 85.8 12.03 243 10.9 55.6
7200 197.8 144.3 0.490 89.0 11.93 250 11.4 56.1
7300 203.9 146.7 0.496 92.9 11.86 259 12.2 56.7
7400 212.1 150.5 0.497 96.9 11.84 270 12.9 57.4
7500 220.7 154.5 0.490 99.4 11.82 277 13.5 57.9
7600 227.3 157.1 0.485 101.3 11.80 281 13.7 58.1
7700 231.5 157.9 0.483 102.8 11.77 285 13.9 58.3
7800 234.7 158.0 0.485 104.6 11.73 289 14.0 58.4
7900 237.8 158.1 0.486 106.2 11.71 293 14.2 58.5
8000 240.6 158.0 0.487 107.7 11.66 296 14.2 58.5
8100 242.7 157.4 0.493 109.9 11.58 300 14.2 58.5
8200 244.7 156.7 0.496 111.5 11.52 303 14.2 58.5
8300 246.4 155.9 0.497 112.3 11.49 304 14.1 58.4
8400 247.9 155.0 0.497 113.1 11.52 307 14.0 58.2
8500 249.8 154.3 0.499 114.4 11.52 311 14.0 58.2
8600 251.2 153.4 0.504 116.1 11.48 314 13.9 58.1
8700 252.5 152.5 0.509 117.9 11.46 319 13.9 58.1
8800 253.7 151.4 0.511 118.9 11.45 321 13.9 58.0
8900 254.2 150.0 0.515 119.8 11.43 323 14.0 58.0
9000 253.0 147.7 0.526 121.9 11.40 328 14.0 58.0
9100 250.9 144.8 0.536 123.0 11.36 330 13.8 57.9
9200 244.1 139.3 0.542 120.9 11.35 324 13.4 57.5
Finally, here's the 2.5" Speedwerx muffler with Precision EFI's "Stage III" tune. This adds another two psi of boost and nearly 70hp more than stock on 92.2 octane pump gas! Note the conservative A/F ratio all the way to the rev limiter. And also note the gradual application of boost as revs climb from lower RPM. This boost curve is designed for maximum midrange acceleration at WOT without risking encountering deto that might occur from creating excessive torque (high operating combustion pressure) at low RPM. Remember--detonation is a time-dependant phenomenon so it's wise to keep WOT tuning moderate at low revs, and increase the boost as revs climb. The time-dependant issue explains why we might be able to safely make more HP on pump gas with the high revving, smaller bore triple. Most wise tuners always felt the 250 was the pump gas limit on the Suzuki turbo bigger bore low revving two cylinder (many who have tried to operate the boosted Suzuki twin on pump gas at higher HP levels had to resort in installing heavy head studs to keep quietly detonating engines from lifting the heads and spewing coolant). But the lower torque, higher revving Yamaha triple with less timing advance surely explains its greater pump gas HP output with no signs of detonation.
Precision EFI Stage 3 Tune, Speedwerx Stage 2 Muffler
EngSpd STPPwr STPTrq BSFA_B FulA_B LamAF1 LM1Air Boost FulPrA
RPM CHp Clb-ft lb/hph lbs/hr Ratio SCFM psig psig
6500 184.4 149.0 0.504 80.9 11.92 227 9.2 54.1
6600 183.3 145.9 0.508 82.2 11.79 228 9.3 54.1
6700 183.8 144.1 0.513 83.5 11.68 230 9.4 54.2
6800 185.3 143.1 0.519 85.4 11.59 233 9.6 54.3
6900 187.8 142.9 0.521 87.0 11.56 237 9.9 54.6
7000 191.5 143.7 0.523 89.0 11.52 242 10.3 55.0
7100 196.7 145.5 0.525 91.7 11.42 247 10.9 55.5
7200 202.0 147.4 0.533 95.8 11.36 256 11.6 56.1
7300 208.2 149.8 0.539 100.7 11.33 269 12.5 57.0
7400 216.5 153.6 0.536 104.3 11.34 279 13.3 57.7
7500 226.3 158.4 0.531 107.9 11.39 290 14.0 58.3
7600 235.6 162.8 0.524 110.6 11.44 298 14.6 58.8
7700 243.0 165.7 0.514 112.1 11.47 303 15.0 59.3
7800 248.7 167.5 0.511 114.2 11.47 309 15.3 59.5
7900 252.8 168.1 0.514 116.8 11.44 315 15.6 59.7
8000 256.1 168.1 0.512 118.4 11.42 319 15.8 59.9
8100 259.1 168.0 0.513 120.1 11.36 322 15.9 60.0
8200 261.6 167.5 0.520 123.1 11.29 328 16.0 60.1
8300 263.8 166.9 0.524 125.1 11.29 333 16.1 60.1
8400 266.3 166.5 0.523 125.9 11.35 337 16.1 60.1
8500 268.4 165.8 0.521 126.5 11.36 339 16.1 60.0
8600 270.0 164.9 0.519 127.0 11.33 339 16.0 59.9
8700 270.9 163.5 0.520 128.0 11.29 341 16.0 59.8
8800 271.6 162.1 0.525 129.5 11.26 344 16.0 59.7
8900 271.0 159.9 0.527 130.2 11.29 347 15.9 59.7
9000 270.0 157.5 0.533 130.8 11.33 350 15.9 59.7
9100 267.7 154.5 0.538 131.3 11.37 353 15.9 59.7
9200 261.5 149.3 0.540 130.9 11.42 353 15.8 59.7
Update 9/22/17- Since we posted information on our new Arctic Cat 9000 / Yamaha SideWinder 998 Turbo ECU Mapping developed by Precision EFI, one of the most asked about features is the Knock Light since it is something no one else is currently offering for these machines. We are proud to be the first in the industry to offer a Knock Light as a standard feature on all maps at no extra cost. Extensive work went into the OEM knock detection feature to make this work better in high boost applications so you will have the safest and most reliable system available to give you a little more peace of mind and a safety margin should you get some low quality fuel. It's simply incorporated into the mapping to appear on factory digital display for a true plug and play installation without the need for external lights or wiring. Check out this video to see it in action...
10/5/17- Billy Howard from Speedwerx eastern distributor Howard's Inc has been using his own Arctic Cat XF9000 as a rolling test bed on the snow, grass, and on the asphalt like you see here. His full-bodied machine with the basic asphalt setup and the stock engine with only our Stage 3 ECU Flash and Stage 2 Lightweight Muffler (271.6hp @16lbs. boost on pump gas as previously shown at DynoTech Research) runs 9.50 @136mph in the 1/4 mile. In the recent AmSnow Shootout, he ran 5.32 @128mph in the 1/8th mile, good enough for the #5 slot on OSDRA's Crazy 8 all-time quickest in the Pro Mod class. Not too shabby for a pump gas trail sled- keep up the great work Billy!
2018 XF 9000 Goes 125MPH on the Hillbilly Highway!
Speedwerx ECU Multi-Map Bundle + Dash Upgrade
The Multi-Map bundle includes the Stage 1 and 2 pump gas maps, and Stage 3 race gas map, plus a stock power level Economy Map for long range cruising. This is a fully software integrated solution with no additional hardware required other than our Stage 2 Muffler and a Hypershift Clutch Kit to harness the additional power- this enables you to boost your power level up to 280hp on premium pump gas. Also included is a fully adjustable Launch Control with Adjustable Activation, RPM, Boost and Predictive Traction Control- this enables you to electronically dial in your machine to ensure you can get maximum acceleration in varying conditions.
A key part of this package is the Dash Upgrade that allows you to select which of the Maps you want to run and adjust Launch Control right from the the diagnostic menu on factory instrument panel- you can go from mild to wild at the push of a button in just a matter of seconds!. As with all of our ECU maps, this also includes an integrated Knock Light with Active Boost Trim for your peace of mind should you get some poor quality fuel. A Boost Gauge that reads the boost pressure in both a bar gauge and a large numerical format, and a feature that records peak boost and top speed during a run is also included, and an AFR gauge is coming soon as well (this will require an additional AFR module package to be viewable). New for '22, all 2019+ models with electronic suspension can now have separately adjustable front and rear settings and different driver settings can be stored in memory, even for 2019 models originally equipped with unified settings.
Speedwerx L2 Series Stage 2 Lightweight Muffler
Our TIG welded 304 Stainless Steel muffler is a must-have for the new 998 Turbo models. After extensive testing, we are seeing an awesome 23hp gain over stock, with a nice 8lb weight loss as well! This muffler bumps up the boost slightly and leans out the air-fuel ratio, so ECU remapping is required to ensure long term reliability. Even though this is our L2 (Light and Loud) version, the sound level is reasonably low. Much like the similarly designed mufflers we have for the 1100 Turbo models, it is louder than stock but the turbo itself does a lot to help quiet it down to a tolerable level for everyday trail riding.
For a nice boost in power without needing an ECU remap, check out our Stage 1 muffler that makes 15hp over stock with no other changes required!
Stock vs. Stage 2 Muffler comparison (only the muffler was changed, the ECU is stock- remapping will add more power and speed)
Stock Muffler- 105mph at 8600rpm
Stage 2 Muffler- 113mph at 8980rpm!
Speedwerx Lightweight TEAM BOSS / ADAPT Helixes
Our TEAM BOSS /ADAPT Helixes are machined in-house- we shave off excess material to save .10lbs over the stock helixes without compromising strength or durability. These helixes are available in both Electronic Reverse (2-Stroke) and Standard (4-Stroke) designs.
We offer three types of cuts on these helixes-
Straight Cut- these helixes maintain the same angle for the entire length of the ramp.
Compound Cut- these helixes are progressive on the first section of the ramp and have a straight angle on the end of the ramp. In each part number (ex. 59-43.36), the final number (.36) indicates the length of the first part of the ramp where it progresses from the first angle (59°) to the second angle (43°).
Progressive Cut- these helixes progressively change from the starting angle to the ending angle down the whole ramp.
The advantage to the compound radius is that it will typically back shift quicker for snow cross or tight twisty trail riding. The starting angle is always steeper at first for quicker acceleration, then progressively changes to the lesser angle so that the clutches don’t over shift and bog down the motor so you retain excellent top speed.
Custom angles are also available for $199.95 - please call us at 651.982.6020 (leadtime varies).
Speedwerx H5 Alloy Clutch Springs
Don't forget clutch springs as a normal part of your maintenance program! They take a lot of abuse, but are often one of the most overlooked parts in the whole performance equation. Our exclusive H5 Alloy springs are offered in our Hypershift Clutch Kits, and are also available separately for many applications.
For many years, Speedwerx had worked very hard to set the bar in performance clutch kits utilizing titanium springs. The springs and clutch kits worked perfectly, but the prices were getting higher due to the rising cost of titanium. After two years of rigorous testing, we introduced the H5 Alloy springs in 2008. The H5 Alloy springs have a 30,000 to 40,000 psi higher tensile strength compared to standard chrome silicon wire springs and they won't lose rate over time, so you can get the durability and consistent performance of a titanium spring at a fraction of the cost- they even have a 5 Year Guarantee against breakage. The H5 Alloy springs have set the new standard in performance for trail, mountain, and racing applications!
Our vent kits install on the front side of the panels to draw cool air across the clutches and exhaust, and out the rear where the panels have venting molded in from the factory. They are made from laser cut aluminum for durability and look good with a Black Anodized frame backed with stainless steel mesh to keep the snow out. Kit comes complete with rivets and installation instructions.
ACZR18VK fits 2018+ ZR / XF 6000 / 8000, 2017+ ZR / XF / M 9000, and 2017 ZR 6000 RS Models, and 2017+ Yamaha Sidewinder Models.
ACM18VK fits 2018+ M 6000 / M 8000 Ascender Platform Models & 2021 Yamaha Mountain Max