[medik418]

I finally got it finished. I posted some video of timed runs on my stock 2009 RZR as a baseline for future mods I plan to do. Don't get too caught up in the scientific inaccuracy, this is the best I could do with what i had. Someday I'll get a Gtech and make it a little more accurate. I also understand that there are those who will say that this is not a true representation of RZR performance since it's not done in the sand, dirt, mud or enter what you wish. All of the runs were done on asphalt and all I was trying to do was provide some input into what happened when I aded 26 inch tires, a new drive belt and removed the clutch spacer. I hope some of the folks who are asking about this will get some idea of what to expect. I cannot say that all RZRs will respond the way mine did, this is simply the result I got with mine.

Sorry about the sideways video, I was using my Iphone due to time cntraints and didn't know it would do that.

By the way, top speed increased by about 8 mph. I'll know exactly when I can get the gps mounted and do another top speed run. Top speed yesterday before the spacer removal indicated 53-54 on the speedo and the last run shown here was kept going till the rev limiter kicked in.
Enjoy!

 

[BlackBart]

Tom,
I for one think you did an excellent job in getting some baselines AND for a Stocker those are some very good runs. After you get past 45MPH sounds like a turbo kicked in )
Keep up the good work.
Bart

 

[Gundog]

Using the speedometer is not a good check if you are changing tire size the speedo will not read accurate when you change sizes you should use GPS or radar. You could also time a specific distance that would work better than the speedo.

Mike

 

[medik418]

Using the speedometer is not a good check if you are changing tire size the speedo will not read accurate when you change sizes you should use GPS or radar. You could also time a specific distance that would work better than the speedo.

Mike

Quote from the original post: "Don't get too caught up in the scientific inaccuracy, this is the best I could do with what i had. Someday I'll get a Gtech and make it a little more accurate. I also understand that there are those who will say that this is not a true representation of RZR performance since it's not done in the sand, dirt, mud or enter what you wish."

Sorry but setting up a specific distance, and I do agree with you, would have been difficult given the illegality of what the driver was doing. Whomever he was!
The part I found interesting was that even given the inaccuracy of the speedometer with the larger tires, the times taken to attain the same indicated speeds did not vary much at all. This tells me that acceleration wasn't affected negatively by the larger tires (and this is my little brain working here) due to the fact that the speeds indicated at each speed were actually higher than the previous runs due to the larger tires. i.e. it took about the same time frame to go from 0-20 with 26 inch tires as it did to hit a slower actual speed (at an indicated 20) with 25 inch tires. Same goes for the rest of the speeds listed. Does that make sense?
Anyway, the removal of the clutch spacer had no ill affect on acceleration to 50 mph and added somewhere around 8 mph and as I mentioned, I'll get the actual gps speed as soon as possible. The gps top speed with the 25 inch tires was 53.2