Just to let ya know Steves MDS ramps are the real thing. They pull very hard and seem to help back shift also. The 120/340 black green primary is a great match. With the PA head 66.8 grams at 4,000 to 6,000 ft hits 8150 all day long, big smile.
MDS ramps thumbs UP
- Thread starter Ephratafarmer
- Start date
Now see if you can figure out how to get it to run at 7950-8050. At 8150 you lost snort with that setup.
In testing the sleds turned out to be significantly faster at 7950 even though the seat of the pants dyno felt like it was stuck in 3rd gear. This was all prior to Brad putting the 800 PRO with the power addiction head on a dyno so at that point it was only field testing and some educated theory. Now they have the dyno report and it supports what we've experienced on the stock motor/exhaust/timing with this head. The power drops off pretty significantly right at 8100.
A lot of clutch kits are allowing the PRO to even RPM higher under limited load (like a groomed trail) and then fade back to a holding R in heavy snow. That was even slower yet when we set them up in that fashion. That is typical of the stock high alt ap for Polaris. Most stock sleds will see 8200 and sometimes more with no load but in deep or heavier snow then they settle down into 8100ish. If you test sheave temps you'll see that is a hotter running clutch package then a sled that can pull to and then hold steady 7950-8050.
It would be interesting to see if you can even throw a bit more tip to your system and knock that finish R down 100 but still get the same pull and have it hold. If so you are there. The real telling part with these clutch kits seem to be if you can get consistent results in net R"s without load fade. If you get a lot of fade with your setup that simply equaled heat as well as a slower responding vehicle. It also seems to handicap your backshift. You can test this by racing heads up with a test sled full tilt for 5 seconds and then both sleds completely let out for 3 seconds...then hammer down again. You'll see the pull of a good setup come back much more aggressively while the other setup takes a longer duration to start pulling back to full RPM. It's very difficult to scientifically test (so we don't ever report distances or lengths) but it's there and the results and benefits of performance for mtn riding are telling. Thanks for your report.
In testing the sleds turned out to be significantly faster at 7950 even though the seat of the pants dyno felt like it was stuck in 3rd gear. This was all prior to Brad putting the 800 PRO with the power addiction head on a dyno so at that point it was only field testing and some educated theory. Now they have the dyno report and it supports what we've experienced on the stock motor/exhaust/timing with this head. The power drops off pretty significantly right at 8100.
A lot of clutch kits are allowing the PRO to even RPM higher under limited load (like a groomed trail) and then fade back to a holding R in heavy snow. That was even slower yet when we set them up in that fashion. That is typical of the stock high alt ap for Polaris. Most stock sleds will see 8200 and sometimes more with no load but in deep or heavier snow then they settle down into 8100ish. If you test sheave temps you'll see that is a hotter running clutch package then a sled that can pull to and then hold steady 7950-8050.
It would be interesting to see if you can even throw a bit more tip to your system and knock that finish R down 100 but still get the same pull and have it hold. If so you are there. The real telling part with these clutch kits seem to be if you can get consistent results in net R"s without load fade. If you get a lot of fade with your setup that simply equaled heat as well as a slower responding vehicle. It also seems to handicap your backshift. You can test this by racing heads up with a test sled full tilt for 5 seconds and then both sleds completely let out for 3 seconds...then hammer down again. You'll see the pull of a good setup come back much more aggressively while the other setup takes a longer duration to start pulling back to full RPM. It's very difficult to scientifically test (so we don't ever report distances or lengths) but it's there and the results and benefits of performance for mtn riding are telling. Thanks for your report.
If ya need 8000 RPM adding a little weight to these arms is very simple, interesting thing about reading the RPM on our tacks is making sure its the real thing.
Ramps can't gain us power other than to the track, through a better grab on the belt, I do believe this is happening with the MDS arms. They pull harder than stock. Yes I'm running the HPS can.
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I certainly don't know that, but over the yrs tacks have been off as much as 200 RPM. When this sled falls below 7900 RPM on the tack it seems to loose some grunt, and as we know keeping the exact perfect RPM in diff elevations and diff snow conditions can be a hard. Therefore trying to run on the lower range of the RPM dosen't always work. Would love to see a Dyno on this sled stock and with the PA head. Many are running 8200 plus RPM stock and with heads, ( not saying their right at all ). Seat of my pants said around 8000 to 8100 pulls hard, and had a little recovery ability. Thanks
You can go to the power addiction website and see the stock exhaust with the 13.6 head dyno versus bone stock..done at CPI
I also tested various clutch setups and trust me you want 7950-8050 if your setup will hold those R's. It's a pretty significant point a to point b plus over a setup that ran out 8150 - 8200. We also had trouble loading initially and then getting it to hold the R's at the higher setup (IE less weight). It would give you the 8200 up on the trail and then fade badly under load. The first four or five loaded runs would be OK but you quickly heated up and lost significant performance. Yes you are also correct if a sled can only pull 7700 they can barely get out of their own way. It's just amazing to see the difference in just that small amount of RPM.
I also tested various clutch setups and trust me you want 7950-8050 if your setup will hold those R's. It's a pretty significant point a to point b plus over a setup that ran out 8150 - 8200. We also had trouble loading initially and then getting it to hold the R's at the higher setup (IE less weight). It would give you the 8200 up on the trail and then fade badly under load. The first four or five loaded runs would be OK but you quickly heated up and lost significant performance. Yes you are also correct if a sled can only pull 7700 they can barely get out of their own way. It's just amazing to see the difference in just that small amount of RPM.
They Flat Frickin RIP!!!!
I'm running PA head 13.1, MDS ramps 67.5 and a cut track and they just flat pull, 8100-8150 today in 2 ft of heavier fresh in the washington cascades, no bog, instant R's back after getting off on a climb, and engagement is a dream in the tight trees, no getting stuck in the deep after stopping to check your line, they just work!!!! kind of cool when you buy a product that does what the guy that made it says they are gonna do rather than get crap put on and think it's working better because that empty hole in your pocket tells you it's working better so you can sleep at night. Go buy a set, what do ya have to lose, Steve gives your money back if your not happy, WHO does that anymore on an installed product!!!!
I'm running PA head 13.1, MDS ramps 67.5 and a cut track and they just flat pull, 8100-8150 today in 2 ft of heavier fresh in the washington cascades, no bog, instant R's back after getting off on a climb, and engagement is a dream in the tight trees, no getting stuck in the deep after stopping to check your line, they just work!!!! kind of cool when you buy a product that does what the guy that made it says they are gonna do rather than get crap put on and think it's working better because that empty hole in your pocket tells you it's working better so you can sleep at night. Go buy a set, what do ya have to lose, Steve gives your money back if your not happy, WHO does that anymore on an installed product!!!!
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Got'em
Put them in pulled trigger they work!!! Got doubts? Call Steve tell him how and were you ride this guy really wants you to have what you want as far as the performance your looking for. Wish all aftermarket outfits had half the customer service as Steve. Just my 2 cents
Put them in pulled trigger they work!!! Got doubts? Call Steve tell him how and were you ride this guy really wants you to have what you want as far as the performance your looking for. Wish all aftermarket outfits had half the customer service as Steve. Just my 2 cents
D
dmkhnr
Well-known member
I ran these weights on my NA M8 cat, and they were the real deal. Steve is more than anxious to get you set up correctly, and loves feedback. I ran a pretty good setup prior to using his weights using an adjustable weight and an aftermarket secondary, and saw cooler cltuches and an increase in trackspeed once I switched to the MDS weight/stock secondary.
I've tried to get him to start making turbo weights for the pro, and wouldn't hesitate to put them in a stocker.
I've tried to get him to start making turbo weights for the pro, and wouldn't hesitate to put them in a stocker.
D
diggerdown
Well-known member
NO NO they are cams!
It's nice to know you have my loaner sled dialed in for Canada....
paw paw you using HPS can ?
Yep.
