Rhino 700 engine modifications

[DaveC]

OK this is interesting. I thought I would share cuz you guys have always been cool to me. I already have a 2008 Rhino 700 EFI. It was pretty much stock.

I bought a 2010 RZRS because they are faster than the Rhino. Right? NO. Well at least not stock. My buddy has a Raptor and they are fast and have 55 HP. So I was thinking WTF??!?.. We are getting ripped off here.

I got the RZRS in January 2010 but I already purchased the speed kit for the Rhino so I might as well install it.

Now the RZRS still has more potential than the Rhino and that seems to be the key but I already owned the Rhino and there is no sense selling it so I might as well make it faster. :skull

The setup is from Hunterworks. Power package #3 plus Rhino 700 Cam Kit Programmable MSD (with their program), clutch mods (greaseless weights matched to the engine mods), Muzzy exhaust, Raptor stage 1 cam. The Cam, their clutch mods and MSD map are the real story here.

The trick to this setup is the matching. All pieces are required or its a no go. I actually installed stuff separately in stages. Exhaust first, programmer then cam, then clutch. Once the cam and clutch went in it was on.

I cannot underemphasize their clutch modifications must match. If you look at the clutch (the belt portion) it is centrifugal. The second belt pulley increases in size changing the "gear" with RPM, so the timing is key. More power changes the rate of expansion, so a modification is necessary to get proper acceleration.

The MSD is programmable and they gave me several MAPS which I changed with each bolt on.

This was pretty easy. Cam install wasn't too tricky.

I got 58 MPH. It accelerates much faster than stock which is the real story. It beats my stock RZRS and keeps up with my buddies modified RZRS. so we organized a little drag race between the Rhino and 7 RZRS. LOL

Nobody in my crowd believed it so I let them drive it..... LOL:skull All they said was damn.

Now I got a brand new $15K RZRS that is slower than my Rhino. :fsakesLMFAO!!! Here we go again!

 

[SFV2RVR]

Doesnt the stock razr s do 63 mph outta the box?

 

[djunkie]

If it accelerates as good as the RZR-s thats pretty impressive. I'd like to line mine up to an RZR-s just to see how it compares. After watching a couple of the RZR's climb the sand hills last weekend I already know I have a ways to go. I really don't wanna get into my motor anymore so I think I'm just gonna work on some better clutch tuning. Overall I'm pretty happy with the way mine performs. Theres always gonna be someone faster anyways.

 

[djunkie]

Doesnt the stock razr s do 63 mph outta the box?

Depending on tire pressure my 660 Rhino will run almost that fast. At this point I could care less about top speed. I want climbing power. I wanna change my clutch spring to slow down the up shifting. I'll still get the same top end but it'll hold the lower gearing and keep the RPM's up more in the slower speeds.

 

[Riverbound]

OK this is interesting. I already have a 2008 Rhino 700 EFI. It was pretty much stock.

I bought a 2010 RZRS because they are faster than the Rhino. Right? NO. Well at least not stock. My buddy has a Raptor and they are fast and have 55 HP. So I was thinking WTF??!?.. We are getting ripped off here.

I got the RZRS in January 2010 but I already purchased the speed kit for the Rhino so I might as well install it.

Now the RZRS still has more potential than the Rhino and that seems to be the key but I already owned the Rhino and there is no sense selling it so I might as well make it faster.

The setup is from Hunterworks. Power package #3 plus Rhino 700 Cam Kit Programmable MSD (with their program), clutch mods (greaseless weights matched to the engine mods), Muzzy exhaust, Raptor stage 1 cam. The Cam, their clutch mods and MSD map are the real story here.

The trick to this setup is the matching. All pieces are required or its a no go. I actually installed stuff separately in stages. Exhaust first, programmer then cam, then clutch. Once the cam and clutch went in it was on.

I cannot underemphasize their clutch modifications much match. If you look at the clutch (the belt portion) its is centrifugal. The second belt pulley increases changing the "gear" in size with RPM so the timing is key. More power changes the rate of expansion, so a modification is necessary to get proper acceleration.

The MSD is programmable and they gave me several MAPS which I changed with each bolt on.

This was pretty easy. Cam install wasn't too tricky.

I got 58 MPH. It accelerates much faster than stock which is the real story. It beats my stock RZRS and keeps up with my buddies modified RZRS. so we organized a little drag race between the Rhino and 7 RZRS. LOL

Nobody in my crowd believed it so I let them drive it..... LOL:skull All they said was damn.

Now I got a brand new $15K RZRS that is slower than my Rhino. LMFAO!!! Here we go again!

Im getting ready to order the same exact thing for my Rhino. :thumbsup after doing a lot of homework it seems to be the best way to go.

 

[DaveC]

Not in the dunes. I guess we are supposed to see that on Hard pack. But I suspect the Rhino will still be faster because Hunterworks was claiming 63 MPH for the Rhino. I will report back.

My buddies seriously modified RZRS (exhaust, programmer, paddles) is barely faster but considering it used to spank my stock Rhino by 5 car lengths, now its pretty much a draw, thats quite an improvement.

I own both, the Rhino is faster. LOL :bash:

Doesnt the stock razr s do 63 mph outta the box?

My 2010... My bank account is fawked now cuz I gotta buy some shiat for that one too...... :bash:

 

[DaveC]

Do it. This was a piece of cake.

I have done the homework too and I got it running. We spent 2 hours "drag racing" at the dunes and after driving both I suggest you do it. :skull

Incidentally the cam is a Yahama part #, Raptor stage one. Those fawkers at Yamaha were holding out on us. :bash: I really don't see any longevity issues as the Raptor seems to run fine with no problems.

You can also do the piston but seems like too much work for that gain.

Let me emphasize the clutch mods being matched to the cam. Order their #16 cam weights and install them with the cam.

My buddy with a Rhino did the same exact thing with the same mods EXCEPT for the clutch. His did not run the same, not even close. BUT later He found out he had two problems though. 1) wrong weights 2) and his wet clutch is smoked. He couldn't figure it out until he broke something unrelated and tore it down to find his wet clutch completely smoked. (long story) He should be back in business soon with a new wet clutch and good to go now.

Im getting ready to order the same exact thing for my Rhino. :thumbsup after doing a lot of homework it seems to be the best way to go.

 

[RiverDave]

That's a hell of a jump in performance right there.. Nice to hear a real world, modification that works!

RD

 

[DaveC]

No it out-accelerates the stock RZRS. Night and day difference.

The modified RZRS keeps up and puts a fender on it. Still technically faster but he had paddles and I didn't.

The acceleration over stock is the story here. Not the top speed. I took it out on the dunes and damn. :skull

If it accelerates as good as the RZR-s thats pretty impressive. I'd like to line mine up to an RZR-s just to see how it compares. After watching a couple of the RZR's climb the sand hills last weekend I already know I have a ways to go. I really don't wanna get into my motor anymore so I think I'm just gonna work on some better clutch tuning. Overall I'm pretty happy with the way mine performs. Theres always gonna be someone faster anyways.

 

[TOBTEK]

That's a hell of a jump in performance right there.. Nice to hear a real world, modification that works!

RD

I think you are SOUR'ed on SXS mods forever.... Drug "big Tex" home Sunday from Shasta..... 18' flat bed. Have the welder ready? needs some mods to fit both T-rex's

 

[djunkie]

No it out-accelerates the stock RZRS. Night and day difference.

The modified RZRS keeps up and puts a fender on it. Still technically faster but he had paddles and I didn't.

The acceleration over stock is the story here. Not the top speed. I took it out on the dunes and damn. :skull

So you put a cam in yours too?

 

[DaveC]

I'm very happy with the results. I did a burn out in my driveway before I left and I already knew something was up....

Here is an excerpt from their tech article. Look at the delta on the distance required to reach top speed:

From Hunterworks: Huntworks tech thread

"After Install results:

Peak HP went up about 5 hp but the most amazing area was at 50 mph there is about a 13 hp gain.

Our 0-50 times to 8.5 secs which is almost a 3 sec difference which is big!! Top speed went to 62 mph. You might say, that is not so much but the reason why it was 62 was it was hitting the rev limiter and we were able to hold 62 with about 3/4 throttle. Also to hit 58 before it took about a 1/4 mile and we hit 62 in about half the distance."

That's a hell of a jump in performance right there.. Nice to hear a real world, modification that works!

RD

BTW my buddy has a stock Teryx, brand new. That thing is no slouch. It holds its own against the RZRS too. I would take that and find some mods for that thing.

 

[DaveC]

In the Rhino? Yes. I installed this cam. Stage 1 Raptor cam. Made by hot cams but its a Yamaha PN.

http://www.hunterworks.com/inc/sdetail/35570


Mine is a 700EFI but I understand they have a 660 cam too. That just require jetting. Piece of cake.

But the clutch mods (i.e. weights) are matched to the Cam. That is absolutely key. I changed the weights twice.

The link is there. Read the tech article. Give it some thought.

So you put a cam in yours too?

 

[djunkie]

I think you are SOUR'ed on SXS mods forever.... Drug "big Tex" home Sunday from Shasta..... 18' flat bed. Have the welder ready? needs some mods to fit both T-rex's

I put a setup like this on my brothers 16 ft trailer so we can fit both of our Rhinos on it.

 

[djunkie]

In the Rhino? Yes

http://www.hunterworks.com/inc/sdetail/35570


Mine is a 700EFI but I understand they have a 660 cam too. That just require jetting. Piece of cake.

But the clutch mod (i.e. weights) are matching to the Cam. I changed the weights twice.

Did you have to upgrade any valve springs?

 

[DaveC]

No. They have several cams. The stage one Raptor works without modification on the 700.

I think the other "larger" Raptor cams that have clearance issues and need more compression anyway.

We can get more power but it requires complete engine disassembly, new pistons with higher compression and check clearances. Too much IMHO. But available nonetheless. Good idea when engine replacement time comes.

Check out their forums.

I understand the difference between Rhino and Raptor is lower compression and smaller different cam. along with other "electronic detuning" We were just trying to back some of the Raptors power (i.e. 55 HP) those bastards took away from us. :bash:

Call the guy at Hunterworks about your 660. They are cool.

Think about it. Why does the Raptor have 55 hp and we only have 23? Same motor (sort of) WTF???!?...... LOL They are holding out on us. :bash:

Did you have to upgrade any valve springs?

 

[pronstar]

My buddy has the same mods to his 700, just hasn't installed the cam yet. I copied/pasted your results in an email to him...I'm tired of my 660 kicking his Rhino's ass...always waiting for his to catch up :skull

Depending on tire pressure my 660 Rhino will run almost that fast. At this point I could care less about top speed. I want climbing power. I wanna change my clutch spring to slow down the up shifting. I'll still get the same top end but it'll hold the lower gearing and keep the RPM's up more in the slower speeds.

Yup. I hit 63 in my 660 and my engine was screaming.
A few MPH up top is meaningless to me. I want acceleration.

Do you have a duner's kit/spring? It makes a nice difference.

 

[djunkie]

My buddy has the same mods to his 700, just hasn't installed the cam yet. I copied/pasted your results in an email to him...I'm tired of my 660 kicking his Rhino's ass...always waiting for his to catch up :skull




Yup. I hit 63 in my 660 and my engine was screaming.
A few MPH up top is meaningless to me. I want acceleration.

Do you have a duner's kit/spring? It makes a nice difference.

No I just have the modified sheeve. I'm gonna look into the the spring change and possibly going with lighter weights in the sheeve to get the bottom end back. Did the duners kit kill any top end on yours? I'm not a duner but it sounds like the duners kit might help with what I want.

 

[DaveC]

The correct weights are key.

I installed the cam with the wrong weights then hot lapped.

Then changed the weights to the correct weights for the cam. The difference was noticable in acceleration.

the weights and spring control when it shifts per se.

plus the weights are easy to change. If you are digging into the spring the weights are right there

the top speed is cool but the real story is the acceleration.

BTW my neighbors hate me now from all the hot laps

 

[pronstar]

No I just have the modified sheeve. I'm gonna look into the the spring change and possibly going with lighter weights in the sheeve to get the bottom end back. Did the duners kit kill any top end on yours? I'm not a duner but it sounds like the duners kit might help with what I want.

I pulled 63 mph with the duner's kit, so I don't think it compromised top speed at all.

I've spoken to a few people who, for some reason, didn't think they'd want the duner's kit because "it kills top speed" or "I don't dune"

But after driving my Rhino, they've all gotten it :thumbsup
It really just seems to raise the rpm of clutch engagement.
So it revs into the meat of the torque curve sooner...it really leaps off the line.

These same people, BTW, didn't think paddles/smoothies were needed in the dunes. And yet they're all sporting them now as well :thumbsup

 

[RiverDave]

I have a welder here, but I don't know how to use it.. What do you need to weld?

why would you need to modify an 18' Flat bed to get 2 T-rex's on it? I'm pretty convinced I could get 2 on my 16' flatbed easily, without any modifications?

RD

 

[Cole Trickle]

I have a welder here, but I don't know how to use it.. What do you need to weld?

why would you need to modify an 18' Flat bed to get 2 T-rex's on it? I'm pretty convinced I could get 2 on my 16' flatbed easily, without any modifications?

RD

I think you would struggle to put 2 on a 16' trailer. These things are approx 10' end to end. I think an 18' trailer is doable if you back one on and over the tounge and then pull the other one with the tailgate hanging off.

There is no way I could get close with my 16' trailer because of the gate.

Mock loaded 2 into my old carson 20' box but it was tight.

 

[djunkie]

I have a welder here, but I don't know how to use it.. What do you need to weld?

why would you need to modify an 18' Flat bed to get 2 T-rex's on it? I'm pretty convinced I could get 2 on my 16' flatbed easily, without any modifications?

RD

I think you would struggle to put 2 on a 16' trailer. These things are approx 10' end to end. I think an 18' trailer is doable if you back one on and over the tounge and then pull the other one with the tailgate hanging off.

There is no way I could get close with my 16' trailer because of the gate.

Mock loaded 2 into my old carson 20' box but it was tight.

My brother bought a 16' trailer. We couldn't load 2 Rhinos on it. Trailer is about a foot short. I made some 2 foot extensions for it like the ones we made for the bed of my truck. And they flip forward when you don't need them out so we can fit it in my dads garage.

 

[DaveC]

16 no way. Unless you modify it :skull

Lucky I don't own one because I'm getting an 18' or 20'