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Belt Tension 2018 RT
- Thread starter JimboRTS
- Start date
h0gr1der
New member
My RT service manual has 2 different ranges in it. In the "Drive" section it lists 1050N ±150N In the "Technical Specifications-Vehicle" section it has a lower specification of 775N ±150N. Both of these measurements are with the rear wheel off the ground and rear suspension fully extended. Converting to lbs of force, a max high of 1200N equals 269.7 Lbs of force (way too much). On the lower scale, 625N equals 140.5 Lbs of force. I lowered the belt tension to the absolute minimum and installed a Roadster Renovations vibration damper to get rid or all my belt vibrations. Try lowering your belt tension if you have vibration from the belt, it may cure the problem without a dampener.
MeudtPG
Member
Thanks h0gr1der. So, what I understand is the factory specs on a 2018 RTL is 129.2 Lbs. of force +/- and anything in between still be in spec? This appears to be quite a substantial +/- range for precision specs on a $30,000.00 machine and I would expect BRP spec to be much less variation. Why so generous of variation? Seems we should be able to use this gauge, hit the spec lbs. of tension and be good to go without all the questions up or down for belt tension. More explanation is welcome.
What on the ground Krikit II quick test would be for a spot check - say at hotel before continuing journey on the road (without) lifting wheel? Trying to master a reliable simple step method for belt maintenance with minimal vibration.
It sounds like a lot of folks with 2018 RTL's have belt vibration at 60 to 70 mph and some eliminate it by running mostly minimal Lbs. of belt tension (some with dampener and some without it). If factual remedy exists than we all need to be on the same specs that indeed work eliminating this vibration.
h0gr1der
New member
MeudtPG,
Not sure where you came up with 129.2 Lbs of force, the lowest spec I referenced is 140.5 Lbs of force, with the wheel elevated. That's factory specs. In my trial and error attempts to reduce vibration I noticed that the wheel in the air (with full suspension travel, not jacked on the rear shock mount) gains between 20-30 Lbs as the wheel hits the ground and the suspension squats.
If you read enough and talk to enough people, you'll come up with a lot of recommendations of between 140-160 lbs of belt tension on the ground. Many folks are going lower than the recommended 140.5 minimum in the air spec and having good results, some with and some without a vibration dampener. I had one point where I had absolutely no vibrations somewhere around 160 lbs, but I can't duplicate the setting at all. So I opted for the vibration dampener. Quick and easy fix, works very well (for me).
MeudtPG
Member
h0gr1der, I was subtracting the difference between 269.7 highest minus 140.5 lowest hence 129.7 variable to play with.
h0gr1der
New member
Ok, I misunderstood the span. From what I've read, changing the belt tension is some cases does not get rid of the vibration, merely changes when it happens and in my case, softened the impulse of the vibration. The factory apparently has a TSB on vibration, mainly to set the tension to where the customer can live with it.
I just received a 2018 RT Service and Repair Manual. Under Technical Specifications it states Belt Tension (with rear wheel wheel lifted) 174 plus or minus 33.7 lbf (fully extended suspension) min 140.03 max 207.7. My belt is at 220 left with 400 miles on 2018 RT Limited. So at 600 miles will recheck and most likely lower to about 174 and see if my whine goes away.
Jim
Jim
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