Just a dumb question if you are reaching the rev limiter say at 6200 rpms and you are getting there at a pretty quick time( without belt slippage) with a stock machine, what do you have to gain by different ecu's, cams,offset keys and all these performance items?
AT WHAT POINT DO YOU HIT TOP PERFORMANCE
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G
Guest
·An ECU does several things. I'm not sure about the UTVs but for many other applications it does the following:
Changes the rev limiter
Installs a better map (leans out the map for better performance)
Changes timing (not in all instances/applications)
Gives a better spark
Now to add to that for more performance two things have to happen.
Suck more air in
Push more air out
To do this an after market filter is the way to go and possibly an airbox modification depending on how far you want to take it and your riding conditions. Of course the other is a better header and muffler/pipe to allow the exhaust gases to escape easier.
Cams come in different grinds. You have a low to mid grind and a mid to high grind. The low to mid gives you more power from low to mid RPMs and the mid to high gives you more power from mid to high RPMs.
Quite honestly I've never used an offset key. I am assuming you are talking about a key that either retards or advances the timing (correct me if I am wrong). If so I'm curious as to why you wouldn't just degree the cams instead of using an offset key (most stock cams can't be degreed unless you modify them however most after market cams can). This motor is new to me so I have some learning to do.
Hope this helps.
PS manufacturers typically tune stock bikes on the rich side which robs performance so there is power to be extracted for tuning it properly.
Changes the rev limiter
Installs a better map (leans out the map for better performance)
Changes timing (not in all instances/applications)
Gives a better spark
Now to add to that for more performance two things have to happen.
Suck more air in
Push more air out
To do this an after market filter is the way to go and possibly an airbox modification depending on how far you want to take it and your riding conditions. Of course the other is a better header and muffler/pipe to allow the exhaust gases to escape easier.
Cams come in different grinds. You have a low to mid grind and a mid to high grind. The low to mid gives you more power from low to mid RPMs and the mid to high gives you more power from mid to high RPMs.
Quite honestly I've never used an offset key. I am assuming you are talking about a key that either retards or advances the timing (correct me if I am wrong). If so I'm curious as to why you wouldn't just degree the cams instead of using an offset key (most stock cams can't be degreed unless you modify them however most after market cams can). This motor is new to me so I have some learning to do.
Hope this helps.
PS manufacturers typically tune stock bikes on the rich side which robs performance so there is power to be extracted for tuning it properly.
Joined
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127 Posts
alelks is correct on all of his answers. The ECU also remaps the timing curves to change the spark timing and fuel timing to raise or lower torque in different RPM ranges. The real question would be what type of riding do you do? If you only ride tight trails and a lot of hill climbing and occasional pulling then open up the air cleaner and exhaust. Then have the fuel remapped so as to not lean you ride out too much. You will also need to adjust your clutches accordingly. Aaen's clutching book is a great source to tell you how to do this.
I have a 400 Scrambler that is pretty fast. This thing taught me that all of the HP in the world doesn't mean a thing if the clutches aren't set properly.
I have a 400 Scrambler that is pretty fast. This thing taught me that all of the HP in the world doesn't mean a thing if the clutches aren't set properly.
G
Guest
·HeHe!
I plan on taking the RZR to the drag strip bracket races to see how it does. I've drag raced quite a bit for fun but I've never actually entered a competition. I would think this sucker should put in some pretty consistent times. We'll see. I can see at least a different pipe, filter and ECU in my future. Not sure if I'll put a cam in this one but we'll see. Once you start modding these things it's hard to stop.
I plan on taking the RZR to the drag strip bracket races to see how it does. I've drag raced quite a bit for fun but I've never actually entered a competition. I would think this sucker should put in some pretty consistent times. We'll see. I can see at least a different pipe, filter and ECU in my future. Not sure if I'll put a cam in this one but we'll see. Once you start modding these things it's hard to stop.
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10,116 Posts
While the PRC staff was in Minnesota last week, one of the treats was a drag race between the RZR, Rhino, Prowler and Ranger. It was on a grass field and the distance was about 300 yards. The RZR won by such a margin that it had time to turn around and come back and ask us what we thought before the others crossed the line!!! That RZR is smoking fast and it gets to speed QUICK!! The Rhino and Prowler finished close together and the Ranger was last for some reason! It must have been the driver!!
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