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compare 2011 vs 2012, fuel tweaks, timing tweaks, backpressure tweaks, Boyesen Rad Valves

Coming next: a $2200 coolant flowmeter to integrate into our SuperFlow 902 data acquisition system... I subscribe to Cycle World magazine primarily to read CW Technical Editor Kevin Cameron’s (KC’s) monthly TDC (Top Dead Center) column. Recently he did one on...

Eight HP per cubic inch is doable with proper parts and tuning!

explaine by Ryan Hayes, Arctic Cat Inc. Engine Development/ Calibration Engineer

4/20 Chukaroo Hamrah/ Steve Petshke very powerful PS1000 asphalt drag engine. 4/21 PAer Marty Walborn, full mod Banshee drag quad w/ billet 850cc engine. 4/21 pm Dave Weisner/ Steve Mazolla 936cc Storm asphalt drag engine 4/22 Ron Cooper SkiDoo 600 mod water racer...

Here's the aforementioned dyno starter drive sysem! Now we can remotely start engines from either driveshaft. That's a Polaris sled ring gear bolted to a custom fabbed aluminum flywheel. Gone is the $550 German overrunning sprag clutch (that needed relacing...

using test data to create best acceleration with no guessing!

new DTR torque record, more to come when we rev it over 6500 next time

2/25-3/2 reengineering, updating dyno drive system. The big dyno starter drive is mounted to the high speed dyno drive shaft used by 99.99% of the engines we tune. From experience I know that the "blower" (Gates PowerGrip toothed) belt drive...

airflow % increase = horsepower % increase

DTR members have the greatest interest in HP upgrades for the ProR800 and Etec800! Where is the long awaited data?  We're still waiting for pipes to test on the ProR800--SLP is doing their flatland field testing this week before shipping, and BMP and...

Compare early “10” pipes to more powerful “22” pipes

When it comes to making best HP without detonation, cool engines rule. We need just enough heat in the engine components--crankcase, crankshaft, cylinders, cylinder heads and pistons to allow the fuel to vaporize. Infamous "cold seizures" are the result...

12/30 Ross Reynolds from NH, two mountain motor Cats 1/3 Richie Meyers 518er looking for more HillDrag HP 1/4 Joe Shear XF1000 1/5 Tom Anthony IQR tuning  1/6 Jake Jenkins/ Dave Dillenbeck F7 big bore ]cancelled] 1/7 Kevin Atkins XF1000 1/8 Pat Paradiso trail mod...

compare torque and HP of all the 600/ 800 class sleds at this year’s shootout at Woodgate, NY

For the next few weeks or so, all 400 plus HP tuneups are on hold. The following photos show what is left of my $1000 big driveshaft. In my blog schedule I facetiously suggested that last weekend after the Shootout, "OSP Jim and crew [were coming...

  Queenan Racing's turbocharged Hayabusa asphalt drag sled on the dyno table “Blow Up” is a commonly used euphemism among performance sledders to describe a seized piston—stuck in the bore because it temporarily grew bigger than the hole due to lean...

reading between the lines of a typical dyno test on our Crossfire 800 pipe shootout

Glenn Hall dyno tunes this big bore crossfire to max HP for hillgragracing, lakeracing

Arctic Adventures, Livingston Arctic Cat, Victory Motorsports with zero mile 800cc sleds