[GstRdr]

I got the opportunity to swap my 09 stock engine for a 2010 engine with a Holz BB and Muzzy's. ("I Jumped IN It!")
I looked at 820-840 BB, but all you get is a bored out cylinder and large pistons. The Holz Kit is a complete package (Pistons, Ported Head with Bigger Valves, Cam, 48mm Throttle Body, Increased Oil Pressure, Re-flashed ECU, Clutch Kit) and it is as reliable as a stock engine. The power-band is down low, you are not on and off the throttle, you feather the throttle. Rev-limiter is raised to 7,000 or 7,200 rpm. I trail, mtn, crawl and mud, I rarely need low range. (No Dunes in TN)
It is the high compression version, so I am running a mix of high test and racing fuel.
The engine was built to drag race and it ran 9.1 seconds at 68 mph through an 1/8th mile. It has 48hrs and 428 miles when it was installed in my Rzr S.
When I decided to do the swap, one of my buddies asked, "What if it has too much HP, I replied "No Such Thing!""). I've lost about 15 miles per tank of fuel, but I added a 3 gal Roto-Pax fuel can, so not an issue.
NO TINKERING, RELIABLE,AND STEALTH!
Other Modifications:
Chopped Cage
Tony's Toys True 3" Lift
Makin Trax Springs
Hiper Dakar 14" Carbon Fiber Beadlocks
30" Super ATV Dominators
Engine Ice Coolant
Winch
HID Fogs and Headlights (Backup Lights)
Dakota Digital Gauge with Water Temp/Oil Pressure
Mojave Heater with Custom Mount
Air Box from DL Machine
DFR 4 Point Harnesses
Pro Armor Doors
EMP MR-10 Windshield
Tagged as a Medium Speed Vehicle, no issues with riding too the Mtn's.
:icon_rockwoot:
:devil3:

 

[turkeyhunter]

Nice looking ride.. Lots of fun with your new power.

 

[sld386]

Great glad you it now hit the mud and git r done.

 

[RZRUAE]

Nice ride you have.

 

[GstRdr]

After two weekend rides with the new engine, I think that I have some clutching issues.
I know that the 30" tires will affect my acceleration and top speed, but the 30's only weigh 40 lbs more than the stock tire setup. Rotating mass is also an issue. The original clutch was setup for GBC street tires.
Matt, at Holz Racing, has been very supportive and informative as we work through these issues.
Here are my first and second thoughts. The first ride was done at Windrock and only on trails. The low end initial throttle response is good, good initial torque for trails, hills and rocks. As you are only running from 0 to about 25 mph. And the loudness of the Muzzy pipes also add to the sensation of power.
Second thought came during a ride yesterday. On flat asphalt, it ran at 63 mph at 6400 rpm's. Matt says that it should run easily up to 6800 rpm's at 70 mph. I know that the tires should affect these numbers, but not to this extent. This is why I think that I may have a clutching issue.
I was also riding with a buddy that has a stock 2010 S model and I did not start pulling on him until we were nearing top speed. Another reason why I think it is a clutching issue, as I step on the accelerator, it quickly revs to 6,000 rpm's +, but speed does not develop any faster than a stock unit.
The engine sounds and revs faster than a stock unit, but does not feel like it builds speed any faster.
At the lower speeds of trail riding and under trail load, it is actually out performing a stock setup.
I will keep everyone informed as I work through these issues with Matt.
:think::think::redrzr::think::think:

 

[thmTerry]

Thanks for the info!!

 

[GstRdr]

I talked to Matt at Holz Racing today and he is working with me to get the clutching correct for the large tires I am running. They have little experience with large tire applications. I informed him that many of us in the Southeast, run larger tires and lifts because of the mountainous terrain that we ride. So let's see if we can get this engine into it's power rpm range. I'll keep everyone posted.

 

[8ball_99]

Why did the guy you traded want to go back to stock?
I wouldn't think the tires would suck that much HP, But you would be surprised how much larger tires really effect performance. Hope they get your clutching worked out. I'm sure there is atleast a couple guys with BB kits and larger tires.

 

[GstRdr]

It was a Dealer's Rzr and they had to sell it under their Marketing Program. Could not sell with the Holz Engine. I would have thought that Holz had worked with other customers that had big tires, but was told this was not the case. The bigger tires create greater rotating mass, but, with the Hiper Carbon Wheels, they only weigh 40 lbs more than a stock set of wheels and tires. Should have the new clutch springs and weights by the weekend. Going to different springs and 64g to 58g weights.

 

[mark5193]

40lbs of rotating mass is huge!

 

[GstRdr]

It is actually 10 lbs per wheel.

 

[8ball_99]

lol Only 10 lbs per wheel. Its the weight and the height.. Most guys running 30 aren't racing, Heck I know plenty with big tires and lifts that dont go over 25-30. I'm sure they can get you a little better. But out running stock machines with 25-26" tires while your runnin 30"s is not bad, I wouldn't think 25 Hp would do to much more.

 

[GstRdr]

I think that I referred to increased rotating mass, this covers your reference to weight and height. Out running stock Rzr's and S's is because of the complete package. I can take much straighter lines in the rough stuff due to the lift, I can navigate larger rocks quicker because of the increased height of the tires (centerline of the wheel is 3 inches higher to climb over larger rocks), Progressive springs allow me to travel through the rough stuff faster as the tires tend to skip over the high spots, and even though the clutching is affecting the top end speeds, it is definitely much torquier than a stock motor so it ramps up speed much faster offroad. Getting the clutching correct for my setup is icing on the cake. The original clutching was setup for a set of GBC Road tires.
They used it for 1/8" mile drags at 9.1 seconds at 68mph.
There is a very noticeable difference between the stock motor and the Holz Big Bore Motor.

 

[scotty1111]

It's not just the weight. With a taller tire you have effectively changed the final drive ratio, going to a higher gear. Doing so, you'll lose some bottom end and it'll take longer to accelerate until you get the clutching right.

 

[GstRdr]

Received the new clutch springs and 58g weights from Holz Racing today. Also had to purchase the clutch tool. Will try to install this afternoon and post feedback.

 

[swingarm1]

You won't find a better more reliabile BB Kit than the Holz Stage 3 BB Kit...

There customer service is impecable...

 

[GstRdr]

Clutching is an ongoing issue. I received the recommended parts from Holz and as I disasembled the clutch, I called Matt to let him know what I found. The secondary clutch had a green spring with a red or pink stripe. The primary clutch had a red spring with a black and yellow stripe. The weights were 60 gram weights.
Matt was baffled by the setup. I've replaced with green/silver spring, red/white spring and 58g weights. Hope to try over weekend and will report back.

 

[GstRdr]

I did a speed run yesterday. The previous setup would top out at 64 mph at 6,500 rpm. The new setup is now 64 mph at 7,080 rpm. I'm baffled.
Do I need to look at a Dirty Dawg Clutch setup?
I've seen Weber guys doing wheelies.

 

[swingarm1]

I'd talk to Matt first, before you spend any money on another clutch setup...

If I were to buy a clutch setup it would be a Rage III or Rage VIII... JMHO

 

[Stumpduster]

I did a speed run yesterday. The previous setup would top out at 64 mph at 6,500 rpm. The new setup is now 64 mph at 7,080 rpm. I'm baffled.
Do I need to look at a Dirty Dawg Clutch setup?
I've seen Weber guys doing wheelies.

Steve are you using the speedo for reference? Calibrated for 26" tires.......just wondering!