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Discussion Starter · #1 ·
I've listed them in decreasing order, and included the KW to HP conversions. I've only listed the flagship models (and most popular) from most manufacturers. All HP ratings are based on EPA/CARB guidelines. Subject Top Page: Off-Road Motorcycles, All-Terrain Vehicles, Off-Road Utility Vehicles, Off-Road Sport Vehicles, Sand Cars, and Electric (Zero-Emission) Golf Carts Executive Orders - 2013




Things to give a more complete reality:
- curb weights
- drive train efficiency
- RWHP


Things that are interesting:
- The Polaris HO added almost 10% more HP from the previous year (usually the case with their high output models).
- The top 2 contenders for HP (Can-Am 1000XT and the Sportsman XP HO) are 125cc's apart, but only about 5 HP apart. Makes me wonder if the XP is tapped out or the Can-Am is detuned...
- The single cylinder Suzuki King Quad is comparable to twins of the same or more CC's.
- Arctic Cat detunes their standard 700 H1's compared to the TBX and Mud Pro editions.
- The Sportsman 550 is leading the mid-size class (400-600), but not by much. Incidentally, the Sportsman 500 (based off a 20 year old Fiji engine) is still holding it's ground. *note, the can-am 500 actually beats out the 550 XP.*

Things that aren't interesting:
- Honda's are bringing up the rear.



I thought you guys would find this interesting. I have an excel spreadsheet for this current year, I'll make an attempt to upload it if you want to sort by measures other than HP. You can check my math and critique where needed.

Spreadsheet - 2013_EP_HP_Ratings_ATV.xlsx - download now for free. File sharing. Software file sharing. Free file hosting. File upload. FileFactory.com
 

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Any idea what the A/C 550 H1 is rated at, & where it compares to other 500 -550's?

A few weeks ago I was comparing HP ratings and I came across a California Emissions webpage that had all the HP ratings. According to that website, the AC 550 LTD for 2011 has 38.8 HP. THis is right in line with most other 500 class machines. They're all about the same, give or take about 2 HP, and AC is right in near the top. Clap
 

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However, what annoys me is the 700 class machines. The MudPro has 49.1 HP or something, but the regular H1 [like the LTD I have] is only at 41.4 HP. :angry:

This makes the H1 the LOWEST by FAR in HP ratings of any 700 class machine. Even several 650cc power plants put out more HP than AC's 700 H1.

Now, the Mudpro, with it's differently tuned ECU, gets the industry standard of about 49 HP, so we KNOW that AC's 700 engine can do it. So then WHY OH WHY do they de-tune the engine for the regular H1's? I'd love to just buy a MP ECU and plunk it in there to add some HP, but obviously the snorkels of the MP have a part to play, and then I'd also have to choose as to whether I want a speed limiter, or no EPS.

I wish AC would just wake up and offer the market a replacement ECU tuned to the MP's specs but with no speed limiter for the 700. It would sell so fast dealers wouldn't be able to keep them on the shelves. We probably wouldn't get the full 8 HP extra, but we'd at least get 5 or 6, and then we wouldn't be so far behind all the others manufacturers in terms of HP ratings.
 

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A few weeks ago I was comparing HP ratings and I came across a California Emissions webpage that had all the HP ratings. According to that website, the AC 550 LTD for 2011 has 38.8 HP. THis is right in line with most other 500 class machines. They're all about the same, give or take about 2 HP, and AC is right in near the top. Clap
Then you have the can am 500 with 46 hp. I dont know why they dont up the power on the 700. The 550 is dang near there and the can am 500 beats it. So the only more powerful cat compared to a can am 500 is the mudpro 700 and the 1000s.I dunno And you know the can am 1k is detuned since they already came out with the 1000r in the maverick which is essentially the same motor.
 

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Nice info I know how much work that was to put together!!! Thanks!!!!!
 

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The can am 1000 is detuned, the new maverick sport sxs is going to be 101 HP and the Spyder trike is 106.

I would put money on just an ecu change being all a 700 needs, the 700 MP snorkle necks down to around 1.5" where it connects to the hose going to the air box.

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I would put money on just an ecu change being all a 700 needs, the 700 MP snorkle necks down to around 1.5" where it connects to the hose going to the air box.
That's good to know. But the problem is still the power steering. With the 2012 MP ECU I would be able to keep the power steering, but I'd introduce a 55mph limiter :Bangin:

But if I get a 2009/2010 MP ECU I won't get the limiter, but it won't allow my EPS to work. :wacko:


Someone at Cat needs to come up with a solution to this. An ECU with the MP tuning that still allows operation of the EPS but not speed limited would sell like hotcakes!
 

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Discussion Starter · #10 ·
400crasher -
The Polaris 500 HO has been the same for nearly 15 years... when it first came out, it's only competition in Power was the 600 Grizzly... and it outclassed it in most regards (IRS, gearing, power, clutching, etc...). It's stood the test of time, and I miss my 500 HO.

clamb -

EPA rating for the 550 AC engine is 29 KW, or about 39 HP. The 550 Prowler is detuned to 26 KW, or about 35 HP.
 

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The thing that all must remember about these ratings, is that they dont give the torque rating. Torque is what puts the smile on your face and gets the work done in the end. I can guarantee cat would be on top in most cases, and they have a real low range........ my 550 in my prowler is actually impressive, until higher speeds take over, and even then with the heavy prowler chassis, i can hit 55 mph fairly easily.
 

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I wonder what the HP is on a stock 02 AC 500? With all of my mods plus the port and polished cylinder head I can keep up with my 2012 Polaris Sportsman 500HO, the 500 HO only starts to pull after 40mph and by 55ish its only out front a length. I think with some PSC clutch work my AC should be ahead but not by much.

Btw I can't see the HP figures on my smartphone. Sucks.
 

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Discussion Starter · #13 ·
If those were the Suzuki cats, it was about 32 hp.
 

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if cat could have gained 8hp just by installing a new ecm wouldnt you think they would have done it?

just swapping a mud pro ecm into a 700h1 isnt going to put you at the same hp,, you will also need the mud pro snorkle system
as arctic cat tuned the engine with the snorkles.
 

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Like I already said, the mud pro snorkle necks down to 1.5", just like you do on a carbed bike to keep stock jetting. There is no jetting difference between a 650h1 and 650mp, and it uses the same snorkel as a 700. But what do I know, my work shirts only say catmaster...

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It seems like that's all CAT needs to do, then. Just swap the ECM, and then the 700 has 8 more HP. So that's the big question... Why the heck don't they just do it?!!

I don't think that they trust us with the speed/power. Even with the MudPro they have a 55mph speed limiter. That's retarded [HAHAHA!]
 

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Have you ever ridden a mp at 55 mph?? Lol I wouldn't want to go any faster. But you are a speed demon!
 

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Nope, I've never been on a MP.

But I can get my 550 up to 57mph, when I have enough room. And I can get my 700 to 62mph when I have about the same amount of room. In both cases it takes a while to squeeze out the last couple notches on the speedometer.

I think it would be nice to be able to get up to about 70mph fairly quickly, and then use the room to hold that speed.

But you're right. The MP's are tall enough that the higher center of gravity might be a bad idea with this speed.

When drag racing my 700 ltd vs a buddy's Bruteforce 650 [carb'd] he beat me, but just barely. I wasn't happy about that.

And when I go out with a different buddy who rides the Outty 800r, I don't even have a prayer. I'll ride WOT, and he still has his lunch mostly eaten by the time I catch up.

The AC 700 seems like a good machine, but I wish I would've gone the step further and got the CA 800.

And as for now I'd take such a big loss if I were to sell the 700, so it'll sit with me for a couple more years. I'll have to be patient and wait a bit for the 800.

But in the mean time, I'd love it if I could buy a ECM that would boost my HP by 8, and still keep my EPS while not getting bound down by a speed limiter.

I'm sure cat has the ability to do it, but I guess they won't trust us with it!
 

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Did you race the kawi before and after the Psc work?
 

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Nope, just after. We both started at the same time, and I thought my PSC work would give me the edge. But he had more jam at the beginning. He pulled about a foot ahead of me at the start. But from there we stayed even until we ran out of room.

I never raced him before that.
 
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