Getting More Speed Out Of Your Polaris RZR

Jan 26th 2020

Speed racer ain’t got nothing on the Polaris RZR. But for individuals looking to achieve even greater top speeds and faster accelerations out of the hole, there are several mods and Polaris RZR speed upgrades available on the aftermarket. From big bore kits and aftermarket cylinders to head porting and bolt-on turbos, when it comes to giving your RZR a little more giddy-up and go, there’s more than one way to skin a cat. That being said, however, not all methods and performance RZR engine parts used to increase top speeds are created equal. Some Polaris RZR speed upgrades are quite expensive, while others are too much for a stock RZR drivetrain to handle. Most, however, require an ECU tune at the very least. But whether you’re looking for more power to kill the steepest of hill climbs, or need something to take your racing game to the next level, here are a few options to give your Polaris RZR more power and speed.

Big Bore Kits For The Polaris RZR 

Some people say that big bore kits are nothing but problems, while others argue that the best bang for your buck is going to come from head work, and not a big bore kit alone. Still others pontificate that a turbo is the best Polaris RZR speed upgrade one can do. We’ll admit that at about 30 or 40 miles per hour, a turbo does kick hard and would pass many bored out RZRs. Most big bore kits offer higher-compression forged pistons, giving you a big increase in torque and pulling faster off the line than an RZR Turbo. 

The question of diminishing marginal returns also arises with regards to Polaris RZR big bore kits. The 1110cc kit for the RZR 1000, for example, is roughly an 11% increase in cylinder displacement. On paper, that should give you an increase of around 11 horsepower. And this begs the question, is the extra cost of a big bore kit -- one that only gives you an added 11 hp -- worth it to you? The 1065cc big bore by Sparks Racing is a popular kit for riders that want reliability and not too much boost. Their closed-deck design gives unmatched strength and rigidity, but unlike open-deck engines, heat can be an issue.

If you go with a big bore kit for higher top speeds in your RZR, you should always use some fuel tuning accessories along side it. Regarding the RZR 800, these are particularly finicky with the TPS and idle adjustments, and it's a bit of a technical process to get everything fine tuned. But when done right, proper fuel tuning makes a big difference. That being said, we would still recommend some tuning for the added air/fuel ratio changes as well. 

Head Porting And Valve Jobs For The Polaris RZR

There are countless companies that you can send your head to for porting. Powerline Performance, Bikeman Performance, D&M Racing, Millennium Technologies, the list goes on and on. The stock RZR cylinder heads are not optimal in terms of intake and exhaust ports, so by porting your cylinder heads, engine airflow is enhanced.

In addition to the increased airflow in the engine from ported heads, new cams can also be installed to pack a little more punch into your RZR engine. It should be noted, however, that the XPT RZR has a cam ground that is different than the XP RZR, so if your rig is boosted, your 1k RZR cams are more than capable. 

Turbo Kits For The Polaris RZR

For the money, many riders opt for turbo kits to increase the top speed of their Polaris RZR. With a Polaris RZR turbo kit by companies like K&T or Packard Performance, you don’t have to tear down the engine or conduct significant rebuilds — simply bolt the turbo on and you're ready to blastoff. Flash the ECU and then you've got yourself a machine ready for the UTV World Championship. The RZR engine can take the boost load, and some turbo kits even come with clutch weights so that your machine’s clutch can handle the added power of the turbo. 

While a turbo kit alone is good, combining elements from all three of the above-mentioned Polaris RZR speed upgrades is a surefire way to have the fastest machine on the block. The Packard RZR turbo kit works great with K&T cylinders and CP pistons with Carrillo rods. The 1065cc big bore with ported heads, ported throttle bodies, aftermarket cams, big valves, and aftermarket springs is another rock solid setup that is guaranteed to turn you into Flash Gordon behind the wheel. Polaris RZR speed upgrades like superchargers can also be added to your UTV, but we’ll set that aside for another post on another day!