A DooTalk Member's Test & Results
Been trying to tune a bit and I tried 3 different belts today. (BRP made 391,Carlisle XS 821 & the Gates Carbon Cord 49C4266). The 391 and XS were broken in well about 50 miles on both, the Gates had been washed and dried, but had no miles on it.
I ran them all on the same track all within an 1.5 hour spand. I made sure the belts were adjusted correctly and I warmed them up for about 5 miles before I made 1500 ' pulls. Machine still has 29% break- in left. Conditions were plowed road with hard pack base and 2" of fresh snow. (Temp 3-5 F)
Here are the results:
Belt RPM WOT TOP MPH notes:
B391 : 7900 RPM top 106 mph got to 7900 and stayed, smooth pull, ok back shift
XS 821: 7800 RPM 93 MPH hard pull to 7800, would blip back to 7700, but mostly stay 7800, not great back shift, probably got to 7800
Gates: 7800 RPM 109mph pulled like an animal to 7800, really "torquey" pull and back shift
This was really interesting to me, didn't think lower RPM could create the speed. And the difference in the feel with just changing the belts is pretty amazing. The reason I did this is that people I respect told me these were the best belts for trail riding and aggressive pulls on the lake. So I decided to try all of them to figure out what will be my primary and what I will use as a spare.
Just some other data that is at least interesting. I have no issues or allegiance to any belt mfg, just a sledding enthusiast. Anyone else have different experience or comments? This is all relative to tuning my 2015 Ski-Doo 800 X.