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Max speed seems off on 2013 XP

This is a discussion on Max speed seems off on 2013 XP within the RZR XP 900 forums, part of the General RZR category; Curious if any others have this issue and what the most likely cause is. i suspect slack in the throttle cable but that doesn't account ...


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  #1  
Old May 5th, 2013, 10:53 AM
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Max speed seems off on 2013 XP

Curious if any others have this issue and what the most likely cause is. i suspect slack in the throttle cable but that doesn't account or the reported speed. I recently had a nice long (1.5 mile) straight, smooth, slightly down hill, road to put my foot i to my new XP on. It shot out of the hole way better than my old S modl RZR. At about 65 on the speedo it started to stop accelerating. It the inched past 65-66-67-68 up to 70. I could not break 70 on the speedo.... I then checked my trusty Garmin 60Csx which is very accurate, and it showed a top speed of 64.9 mph. My old RZR-S would register 64 on the gps and speedo. So I have some bugs to work out. What is the likely cause of the speedo being off by 4 mph (stock wheel size), and why am I not hitting 74mph? This is a new RZR, with stock belt with less than 100 miles. At 64.9 would I be generating 4mph of rear wheel spin on hardpack going slightly downhill?
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Last edited by MossLager; May 5th, 2013 at 10:59 AM.
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  #2  
Old May 5th, 2013, 10:57 AM
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Re: Max speed seems off on 2013 XP

speed off is expected they are not accurate on any sxs but what rpm are you hitting ? this will help in deciding on what could be wrong...
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Old May 5th, 2013, 11:00 AM
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Re: Max speed seems off on 2013 XP

Were you on dirt? Could be wheel spin, not getting traction.
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Old May 5th, 2013, 11:01 AM
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Re: Max speed seems off on 2013 XP

some are slower than others, sorry that dont help..i had one of the slow ones & that is why it sits at mcx usa..you should definitely be seeing 70 though on a downhill..i would say you need to adjust your clutching, what rpm is it saying at top speed? clutch kit would be required to make adjustments..
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Old May 5th, 2013, 11:28 AM
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Re: Max speed seems off on 2013 XP

Any mods? Windshield? Added weight? Was it windy..headwind?
As Johnny said..RPM?
Slight down grade I think you should see 75 + indicated on stock tires. Some are weaker than others but that seems a little too much to account for factory variances in power output IMO. Mine on stock tires would hit 70-72 then creep to 76. On 29.5 swamp lite it still pulls 68-69 indicated..65 pretty quick then creeps up from there.
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Old May 5th, 2013, 11:32 AM
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Re: Max speed seems off on 2013 XP

Clutch problems, or, possibly, not getting enough intake-air. Verify the throttle-plate opening first, then go after the clutch's and belt, and then consider getting more COOL air to your intake/s.

Cheers
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Old May 5th, 2013, 11:34 AM
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Re: Max speed seems off on 2013 XP

He's trying to figure out why his isnt running like a typical XP would..yes check throttle adjustment..cold air intake?why mod a machine to make it perform like it should stock?
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Old May 5th, 2013, 11:48 AM
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Re: Max speed seems off on 2013 XP

bone stock xp with lots of add ons 2 people on gps this was 78 mph

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Old May 5th, 2013, 12:10 PM
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Re: Max speed seems off on 2013 XP

My XP4 hits 75 on the road then it starts bouncing off the rev limiter. Thats with a DOM cage, bumpers, roof, doors, front and rear winshield. So I'd say in a lighter two seater you would probably be closer to 80. Honestly though how often you going to run that fast? Mine at 75 feels sketchy at best. If it pulls good up to 65, not sure I'd even worry about it. I've seen what these things look like when they crash at 35. I could only imagine a RZR crash at 75-80 mph.... And at those speeds doing anything but driving in a straight line is pretty out of the question. Atleast with atv tires and stock suspension.
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Old May 5th, 2013, 12:13 PM
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Re: Max speed seems off on 2013 XP

You know how it is..whether you are gonna use it or not when you buy an "extreme performance" machine and you find out yours isn't performing like it should you want to know why..you'd be the same way I bet. Easy to say don't worry about when yours is running well
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Old May 5th, 2013, 12:22 PM
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Re: Max speed seems off on 2013 XP

Quote: Originally Posted by HIGHOCTANE View Post
You know how it is..whether you are gonna use it or not when you buy an "extreme performance" machine and you find out yours isn't performing like it should you want to know why..you'd be the same way I bet. Easy to say don't worry about when yours is running well
haha yeah I mean I'd want mine to run good. But not really on the top end.. I'd be 100% ok loosing 10-15mph off my top speed for more low end. I'd rather be faster 0-60 then be able to hit 80mph on the road.
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Old May 5th, 2013, 12:25 PM
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Re: Max speed seems off on 2013 XP

Quote: Originally Posted by 8ball_99 View Post
Quote: Originally Posted by HIGHOCTANE View Post
You know how it is..whether you are gonna use it or not when you buy an "extreme performance" machine and you find out yours isn't performing like it should you want to know why..you'd be the same way I bet. Easy to say don't worry about when yours is running well
haha yeah I mean I'd want mine to run good. But not really on the top end.. I'd be 100% ok loosing 10-15mph off my top speed for more low end. I'd rather be faster 0-60 then be able to hit 80mph on the road.
I can agree with that..but of yours didn't hit the "normal" top speed would that make you wonder if it was also accelerating 0-60 slower than "normal"?
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Old May 5th, 2013, 12:27 PM
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Re: Max speed seems off on 2013 XP

What was the elevation?

I know the higher you go

The slower she goes
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Old May 5th, 2013, 12:28 PM
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Re: Max speed seems off on 2013 XP

Quote: Originally Posted by Beach Leo View Post
What was the elevation?

I know the higher you go

The slower she goes
Very good point!
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Old May 5th, 2013, 12:29 PM
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Re: Max speed seems off on 2013 XP

We have a couple of 13's in your group of about 20 xp's. We do a lot of pavement riding. Most all have stock wheels. All the 13's are all slower than the the 11's and 12's all though they still hit the same rev limiter at the same 8550. I have a friend that has been trying to figure out why but hasn't had any luck? All of the 11's and 12' run anywhere from 75 to 77 mph on pavement. The 13's run from 69 to 73. All where radar gun verified one day when we where ridin. There where some unhappy 13 owners that day to say the least. Could it be the wetsump robbing power? Or a change in the clutch setup from Polaris?
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