Like many other off-roaders, I am always on the hunt for
more power. But there is a little bit of a difference when it came to my
Polaris RZR. I use my Polaris RZR in a wide variety of terrains and at
different altitudes. Anything from the Imperial Sand Dunes at almost
sea level, to rock crawling at 8,500 ft. I am also not interested in using
race gas, only pump gas for me.
There are a few turbo kits out there, but I was concerned
that while they might do well in a sand dune environment, they wouldn't fair
so well in a rock crawling situation where it is all about low end grunt.
After researching my options, I decided that a Stage 3 Big
Bore Engine Kit from Holz Racing Products would fit my needs the best. Holz
worked with Kroyer Racing Engines to come up with this masterpiece of a kit.
Although the kit has proved its power on the track, what sealed the deal for
me was the durability that you get with a pump gas, natural aspirated motor.
Holz/Kroyer Stage 3 Dyno Chart
This engine kit is probably the most complete engine kit I
have seen for a UTV. Starting with the ported head that has been
expertly machined on a 5 axis CNC and outfitted with oversize valves and
springs – the head sits atop a Big-Bore Cylinder with matching 11:1
compression pistons. The cylinder also has been CNC bored and coated with
Nickel Silicon Carbide cylinder coating (Nikasil). Complementing the ported
head and larger valves is a billet CNC machined Hi-Lift/Duration Cam with
stout chromoly push rods and hydraulic lifters. Fuel is fed through a 46mm
bored throttle body and a billet aluminum intake manifold. Also included is
a new adjustable PRV (oil pressure relief valve), which will help ensure
that your new motor parts are bathed regularly in Joe Gibbs Racing oil.
Topping it all off is a gasket kit, clutch kit, ECU ignition upgrade,
break-in oil and filter, and new iridium spark plugs.
Ported Head Looks Ready for Business
Before I dropped all the parts off, I checked out some of
the parts and was very impressed with the porting and the size of the
valves.
Rock Crawling:
I took the RZR up to
Strawberry Pass Trail
for a ride. This trail starts at about 6,000 ft. in elevation and
climbs to over 8,500 ft. And along the trail are a few rock sections
where you need to slowly climb up and over some large rocks. It was a
perfect test and I was thrilled with the outcome.
This was the first trip on the new engine, so I was a
little nervous. But everything ran perfectly. I definitely
noticed a nice power increase. The tuning was spot on and the
clutch settings worked perfectly.
Sand Dunes:
I was
finally able to get out to Sand Mountain in Nevada for a test of the
RZR. I decided to keep the Maxxis Bighorn tires on it so it would be
more of a test to get to the top of Sand Mountain. I was able to
get it to the top of the mountain before with the Bighorns, but it was
much more of a struggle. Now I don't even have to think about it.
Nice to have the extra power and I can't wait to put the paddles on for
the next trip!
Racing:
Holz/Kroyer equipped Polaris RZRs Dominate VORRA UTV Season Opener
