Posted 16 Mar 2015 There is a guy on ebay with what he calls an R&D Tuned Pipe for the 582 and he claims it makes 80 hp at 5800rpm, Is this true and does anybody know who R&D company is, I cant seem to find them. Share this post Link to post Share on other sites
Posted 16 Mar 2015 They were around a long time. I've never heard anything but bad things about the way they make a 582 run. Peaky power, chasing EGTs, things of that nature. If your only planning to run wide open all the time I imagine it would work pretty good. The boring Rotax muffler design prevents the 2-stroke from "coming on the pipe" like a dirt bike or snowmobile. This makes operating the engine in the mid range possible. Share this post Link to post Share on other sites
Posted 23 Oct 2018 There is a guy on ebay with what he calls an R&D Tuned Pipe for the 582 and he claims it makes 80 hp at 5800rpm, Is this true and does anybody know who R&D company is, I cant seem to find them.R&D's doors were closed many years ago in the late 90's. They made Tuned Pipes for Sleds, also Rotax's used on Airplanes, and even Jet Skies I think. Yes, they made (3) different 582UL Tuned Pipes, and No, not every Tuned Pipe is great. Many People have Opinions on Tuned Pipes, but have never really flown behind one. Some Actual Dyno Numbers of the Stock 582UL, and with their (3) different Tuned Pipes. Dump those Actual Dyno Numbers into an Excel Spreadsheet and then Graph the Power Band.On a Perfect, Good Tuned Pipe, you should be able to draw a Straight Line from Idle(2000rpm) to the Max Rpm it's Design for. It should be making making HP till a little past it's Designed Max Rpm, usualy;y 150-200rpm. You want a Wide Power Band with No Dead Spots, Blips in the Power Band.Stock 582UL with Rotax Exhaust. Max 64.7hp@6250rpm!http://www.rotaxservices.com/dyno.html#25 82UL with R&D 582 - 1 Tuned Pipe. Max 80.7hp@6500rpm!http://www.rotaxservices.com/dyno.html#3 582UL with R&D 582 - 2 Tuned Pipe. Max 77.5hp@6500rpm!http://www.rotaxservices.com/dyno.html#4582UL with R&D - 3 Tuned Pipe. Max 75.6hp@6000rpm!http://www.rotaxservices.com/dyno.html#5Here is a 2004 380HO(A 377 with 11.2cr vs Std. 377 9.6cr) Twin with a fairly decent after market Tuned Pipe. No Large Blips or Dead Spots in the Power Band. Stock 380HO was rated 48hp@7000rpm. Notice it still made 52hp@6500rpm with the after Market Tuned Pipe. Stock 377UL was 35hp@6500rpm! Most Rotax's and other 2 Strokes used on Planes are used in the 4000rpm to 6500rpm Range.Stock 582UL with Rotax Exhaust, Dyno Numbers! You can See that even the Stock Engines Power Band isn't Perfect. Mufflers can be to Restrictive, Carbs to Small, Cylinder & Case Porting casuing Turbulence. Without having the Case & Cylinders Ported for better Airflow, a Tuned Pipe can Multiply the already Stock Bad Power Band. Case & Cylinder Porting can add 10-15% more over all Power. So Stock 64.7hp +10% = 6.47hp + 64.7hp = 71.2hp.RPM HP3500 21.0hp 4000 27.3hp +6.3hp +500rpm4500 31.9hp +4.6hp +500rpm4750 38.6hp +6.7hp +250rpm5000 44.3hp +5.7hp +250rpm5250 49.4hp +5.1hp +250rpm5500 54.8hp +5.4hp +250rpm5750 58.0hp +8.6hp +250rpm6000 62.4hp +4.4hp +250rpm <--- Staring to make less HP! Probably to Restrictive Exhaust, and Porting, maybe even Carbs!6250 64.7hp +2.0hp +250rpm6500 63.9hp -0.8hp +250rpm <---- Loosing Power even with rpm Increase!6750 60.6hp -4.1hp +250rpm7000 57.2hp -7.5hp +250rpm Share this post Link to post Share on other sites
Posted 23 Oct 2018 (edited) Some Skidoo Dyno Sheets.http://www.m-performance.com/Sidor/dyno_sd.htmHere is an example of a Bad Tuned Pipe on a Skidoo 500. Edited 23 Oct 2018 by Armilite Share this post Link to post Share on other sites
Posted 24 Oct 2018 Armilite, There are 7 columns and 5 headings, what's missing? Share this post Link to post Share on other sites
Posted 26 May 2019 Armilite, There are 7 columns and 5 headings, what's missing?I Think, 1st Column = RPM, 2nd & 3rd = Fuel Flow/HR, 4th & 5th = B.S.F.C., 6th = CORR HP, 7th = Torque. I'm guessing 2&3 and 4&5 Metric/American. Share this post Link to post Share on other sites
Posted 26 Feb 2021 Armilite, There are 7 columns and 5 headings, what's missing?They should have Labeled each Column. The BSFC calculation (in metric units) Commonly BSFC is expressed in units of grams per kilowatt-hour (g/(kW⋅h)). The conversion factor is as follows: BSFC [g/(kW⋅h)] = BSFC [g/J] × (3.6 × 106)BSFC = lbs. of fuel used per hour ÷ horsepower.3500pm 23 lbs / 21 hp = 1.095238095238095 GPH 23 lbs / 6 = 3.83 gph4000rpm 29 lbs / 27.3 hp = 1.062271062271062 GPH 29 lbs / 6 = 4.83 gph4500rpm 32 lbs / 31.9 hp = 1.003134796238245 GPH 31.9 lbs / 6 = 5.31 gph Share this post Link to post Share on other sites