Impressive!
What does your xp with stage3 cams show?

 

polaris claims 6bhp and it actually made 8whp. not to bad for the folks wanting to stay under warranty!!

 

just under 8 peak HP above stock, sounds about right. Doesn't sound underrated to me.

Well within the margin of error IMHO.

Thanks for doing the test, I've been wanting to see that!

 

you have to take into account the loss on drivetrain. it made 8wheel hp that means its making way more than the 6 hp polaris rates the kit at since polaris rates it at 6 hp at the crank.

 

Interesting to see how much more power it makes at the higher speeds.
Also how much sooner the stock 2011 peaks and falls off.

There sure is a muck bigger HP spread on the top end than 8 HP. It is really impressive!
Is that just clutching?

 

yes the accross the board power is the bigger deal over the peak.

at the mark thats 13hp more with the stock air box. thats up there with the alba stg 2 cams.

 

The thing is popo is claming 6hp more at the crank. Figure in the driveline loss, that 6 is probably only like 4ish at the wheels. We're seeing 8 more at the wheels which is why i'm thinking maybe its making a bit more then 6 more at the crank. Either way, its a nice gain with the HO kit, but it still won't hang with Nate's stage II's. His cams hit the peak power and that power carries flat across the board where polaris cams start dipping down once they hit their peak. It the upper end, the stage II's will be all over the HO kit. My stage 3 setup is running about 81 to 82hp but i'm running the stock exhaust. When i tested FJK's yoshi RS4 on my setup, it made another 5 up to 86ish. But, it carries that power just like the stage II's across the board to 9k rpm where all the polaris stuff will be way down from that. Food for thought....

 

nice to know. the SBD kit from nate is what ive discussed with him about buying for my 2013 xp. im not worried about warranty, but cant use his air boxes because of the terrain we ride.

 

Ken- great info. Thanks for the offer to meet and watch the dyno run today, but I did not see the PM until I returned home this afternoon.
Thanks for posting the dyno chart and the other info.

 

im going with alba stg 2 cams and the slp slip-on. should be a good combo.

 

Agreed. It will still outperform the HO kit for a little less money. I think Nate's SBD kit will also outperform it with no slip on for even less money. Alba makes great stuff and i think its a great option if your not already in a Jagged X and having the HO vs Alba stage II's debate in your head. Plus you get Nate's customer service with your purchase and thats worth money by itself!

 

Ho yes , thanks guys , i'm really happy to see those result , i'm just waiting mine ...
For my info , is it still a good think to put a ump air filter on a jagged x , i ride long way per day 300 miles on sand road ...

i used one on my rzr 4 mcx turbo , but don't have any exp with xp 900 engine and body.

 

Good write up Ken ,thanks for sharing buddy .

 

 

That was pretty impressive today Ken. All the more reason why I need a turbo!

 

:rofl3:

 

x2 on Nates customer service...I have bugged him alot...and he is always patient and explanitory.

Chris

 

I dont want to sound callous (if that is the right word)...but 6-8hp...meh...2hp over expected...I mean hell yeah but its still nothing...

 

2 more hp than advertised PEAK...but look across the board. It's well more than 8hp across a majority of the powerband.

 

i can let you know sat afternoon. picking up my 13 xp with alba stg2 cams and slp slip-on.

 

nate thought i would be somewhere in between sbd kit and stg 2. 2-3hp more than stock muffler. not quite the hp gain of the alba pipe, but close. i want it somewhat quiet.

 

You missed a great opportunity to post a video of the Dyno Run!opcorn:

That would have been cool to see.

 

I've been planning on picking up the Alba SBD kit, but after seeing this I am going to wait till Nate is able to dyno a HO kit from Polaris and overlay a dyno of his SBD kit.

 

So I have the HO kit on a 2013 WE XP4. Really impressed with the sound and performance. Compared side by side with my buddie's JX and we both liked the sound of the XP4 with HO over JX, not sure why the XP4 sounded so much better. We have yet to race, but will remedy that next weekend ( we have to got to Vegas this weekend for the PAC12 tourney).

Cheers!

 

The more I look at the HO engine, the more impressed I am. It took me a couple of looks to really get beyond the peak numbers that show a just under 8 HP gain.

Ive been looking at the graph a little more, and it has got me thinking about the advertising part of the industry, both on the manufacturing side as well as the aftermarket. It makes me think of some of those "shoot out" style tests I have seen where a "test" is done in an attempt to prove who has the best product. They seldom tell you the whole story, it's usually just showing exactly the part that they need you to see to "prove" a point.

(I am not saying that this graph was done to be deceptive in any way, but it did get me thinking about how a graph could be used to do that)

From purely raw numbers, that graph shows 54 HP vs 67 HP on the top end of the graph. If Polaris wanted to put a "spin" on their numbers, they could claim something like, "The HO puts out 20% more horsepower than the original 900 engine." It would even be true, they just wouldn't talk about at what point on the graph that claim is based on. I suppose any aftermarket company wanting to sell parts could do the same thing.

(To be clear) From the conversations I have had with Alba Nate, I do not see him as the kind of person who would ever do something like that, he seems to be totally on the level.

However, this graph makes me even more interested in seeing a direct comparison that has a completely stock non HO XP, vs an XP with the HO engine, vs the Alba silent but deadly kit, vs an Alba stage 2, all on the same Dyno, same tires, same air pressure, and even done on the same day. Anything possible to minimize variables.

I realize that would be allot of work, but it sure would go along way to ending the debate as to what package makes how much power. (and where on the curve it is made)

It sure is easy for guys like me to make requests like this from a keyboard, while sitting on my ass right? :rofl3:

 

i belive nate has all of the above except the jaggedx. but has posted he will have one soon.

 

how do i buy one of those airbox lids? i might try something similar. is it loud?

 

It sounds like a mild slip on muffler.

 

Is the rev limiter the same rpm on the HO 900?

 

I've been wondering the same thing. I've also wondered what other tuning changes they made on the HO reflash.

Did they advance timing?
Do they recommend premium fuel?
Did they raise the rev limiter?

 

Ken, with your help my JX is on it !!
I dont think its gets much better than what it is now.
I won a few drag races yesterday, that was fun !!
I called Ken on his day off and within 30 minutes he was
at my house and gave up 2 hrs of his day to help me.
Once again many thanks to my buddy Ken !!
You da man !!

 

Thanks Gregg! Anytime. Getting ready to wash mine up now and may experiment with lighter weight and a primary spring change. My ride as a drag racer yesterday was depressing! :scared2:

 

my stg 2 xp kicked ass all weekend! love the slp slip-on!

 

Night and day, huh? Thats what i noticed after i just dropped in the stage II cams by themselves. Stock exhaust and intake and it still ran good!

 

not sure, bought it new with the stg2 installed, stock intake with alba pods in stock airbox. lid off its too noisy, so im going to try the lid mod and see how loud it is.

 

It will be just as loud with the lid modded. Does it have the stg II kit with the alba slip on? If so, theres now way an open lid would be louder then that slip on i would think....

 

no, i have the slp slip-on. its quite a bit quieter than the alba.

 

I am excited about this factory kit my xp4 is alot slower than my 2 seat xp this should level out the playing field and I think the re-clutching helps with those numbers

 

Where did you get the Airbox lid???I want one..