Question on clutching with SLP Pipe Kit on 09 M8 SP 153

[RickM]

Bone

Well I was able to do some testing, We were at 11000 feet for the most part.
once again i was running M8 with slp pipe kit,shift assist,40/36 helix.
clutching was 68 gr. cat weights, yellow white 122/285 cat primary spring.
we were in fresh snow sinking about a foot deep and about 30 degrees.Snow was about 5 ft deep total.

engine pulled hard on bottom, mid range. The engine would pull 7800 PRM.
I want 300 more RPM.
I have purchased cat 65 gr weights to try hopefully this weekend. talked to several others and they think I was a bit heavy on weight.
I also have ordered a speedwerz 125/340 H5 spring. its not here yet.
My thiniking is if not happy with 65s, ill go back to 68 and add the speedwerx spring or even go back to my 70 weights with the H5 spring.
Im real close now, sled pulls hard I just feel 300 RPM will give me more.
If I was at lower elevation I think the 68 would be the ticket. We start riding at 10 K, Ill let you know more, RickM

 

[mtn mike on boost]

just got back from a trip to revy on my 09 m8 w/ the slp single kit.
i ran the slp recommended set up accept for the mtx weights.i was going to use the 70-80 cutler adjustables i had on hand, but on a quick road ride locally, i wasn't pulling the rpm i felt it should.i called slp tech support and asked why i am pulling less weight w/ more hp?the response i got ( and i hope i get this right)
is that cat likes to load the stock motor more to take advantage of the torque it produces.on the flip side, slp is designing their pipe to produce hp, so loading the motor is less important to them.they ended up recommending 68gr. cat weights for me as over the 70-80 gr. cutlers.i was very happy w/ the way the sled performed.coming off a turbo the last two seasons, i was really worried i would be disappointed w/ the power, and don't get me wrong, its no 200+ hp,
but a very capable sled non the less.

 

[iluv2fly]

Well I was able to do some testing, We were at 11000 feet for the most part.
once again i was running M8 with slp pipe kit,shift assist,40/36 helix.
clutching was 68 gr. cat weights, yellow white 122/285 cat primary spring.
we were in fresh snow sinking about a foot deep and about 30 degrees.Snow was about 5 ft deep total.

engine pulled hard on bottom, mid range. The engine would pull 7800 PRM.
I want 300 more RPM.
I have purchased cat 65 gr weights to try hopefully this weekend. talked to several others and they think I was a bit heavy on weight.
I also have ordered a speedwerz 125/340 H5 spring. its not here yet.
My thiniking is if not happy with 65s, ill go back to 68 and add the speedwerx spring or even go back to my 70 weights with the H5 spring.
Im real close now, sled pulls hard I just feel 300 RPM will give me more.
If I was at lower elevation I think the 68 would be the ticket. We start riding at 10 K, Ill let you know more, RickM

For 11,000ft you would still have to run the 68G weights and the 340 spring to see 8000 rpm. I would go the route your going and install the 65 G weights if you want to hit 8100 rpm. The 65's should be the ticket for you, that is pretty high elevation.

 

[DalensM8]

Great post. I have a 09 M8 snopro 153 and I am currently running the 77 gram weights. I picked up the pipe kit and will go to 73 and see how that performs. The 77's are spot on for me from 0-3000, but I needed to go to 75 if I went higher, and we ride to 6000 at times. So I will try the 73 first, then post how it performed. Thanks for everyone getting on here, it helps with a baseline.

 

[Icedog]

just got back from a trip to revy on my 09 m8 w/ the slp single kit.
i ran the slp recommended set up accept for the mtx weights.i was going to use the 70-80 cutler adjustables i had on hand, but on a quick road ride locally, i wasn't pulling the rpm i felt it should.i called slp tech support and asked why i am pulling less weight w/ more hp?the response i got ( and i hope i get this right)
is that cat likes to load the stock motor more to take advantage of the torque it produces.on the flip side, slp is designing their pipe to produce hp, so loading the motor is less important to them.they ended up recommending 68gr. cat weights for me as over the 70-80 gr. cutlers.i was very happy w/ the way the sled performed.coming off a turbo the last two seasons, i was really worried i would be disappointed w/ the power, and don't get me wrong, its no 200+ hp,
but a very capable sled non the less.

I am going to try pulling 71.5 g weights with the D&D white primary (135/330), and the RKT 38/36 running a Speedwerks blue spring. I thought the SnoPro green was too stiff. I ride mostly in McBride, up to around 8000'.

 

[RickM]

Saturdays testing on clutch weights

Well I was able to get to ride yesterday, as earlier posted, im riding at 11000 feet on average. riding 09 M8 SP 153 with slp pipe kit and 40/36 helix.

Yesterday i was testing with the 65 gram cat weights, it ran good, pulled strong, and clutch engagement was right at 4k, under load it would hit 8K RPM and hold solid at 7970 at 11K feet. I like the way it is clutched.

So im going to install a set of 68 cat weights today, and install the speedwerx red/white spring which is a 125/340 rate compared to cats yellow/white 122/285.

Hopefully the 68 will load the engine a little harder, and the spring will gain just a little on top RPM. Will post results for riding at 11K next weekend. RickM

 

[iluv2fly]

Well I was able to get to ride yesterday, as earlier posted, im riding at 11000 feet on average. riding 09 M8 SP 153 with slp pipe kit and 40/36 helix.

Yesterday i was testing with the 65 gram cat weights, it ran good, pulled strong, and clutch engagement was right at 4k, under load it would hit 8K RPM and hold solid at 7970 at 11K feet. I like the way it is clutched.

So im going to install a set of 68 cat weights today, and install the speedwerx red/white spring which is a 125/340 rate compared to cats yellow/white 122/285.

Hopefully the 68 will load the engine a little harder, and the spring will gain just a little on top RPM. Will post results for riding at 11K next weekend. RickM

With the 68's and 340 spring you should see right at 8000 rpm in a climb. I have always liked the heavier weights with the stiffer springs but that is just my opinion. I know on my 09 M8 that it likes the motor loader harder. Key is to watch for trackspeed and see which setup puts out better numbers. When I ran the 68's and lighter spring at 7-9K it would pull about 100 rpm more than my 70's with a stiffer spring but track speed was down quite a bit.

 

[RickM]

Iluv2fly

just got the 68's and white/red spring in, the engagement is now at 3800 RPM down from about 4150, which i like better, im hope it will load better now. I will watch the track speed, I lost some with the 65'S
I will know by next sat. night. thanks for your comments. RickM

 

[montanasledder]

Im interested in the gold spring. How would it work with everything else stock except 70gram cat weights, running full slp exhaust and geared down to 54/66. Heard it gives a lower engagent which would be great for tree riding


O ya its an 09 limited 153

 

[RickM]

montanasledder

The cat yellow/white is a 122/285 rate spring, the gold according to my chart is 75/275 rate, the engagement will drop with the gold, ( no other changes in clutch) I am not sure how big of drop. Dont get to low where you dont have any torque or power. what engagement are you running now?
Ill try and upload my chart for you. RickM

 

[montanasledder]

i think engagment is over 4000. feels to high when tree riding.

thanks Rick

 

[RickM]

Clutching results from today 12-27-09

Was able to go ride today, rode in 3 foot of powder, not much base,at 8000 feet. I have the cat 68's and the speedwerx white/red 122/340 spring.

I like this set up, pulls hard, mid range really pulls hard. loads the motor very well, Pulled 8100 RPM in these snow conditions, very responsive, engagement was at 3800 RPM. I will run this now as my base line set up, Hope to ride at higher elevations in better snow, but really like this set up. Hope this is informative to other M8/SLP pipe kit users. RickM

 

[XFIRE800]

Hey guys, I am running a slp pipe setup on my 09 crossfire 800 141" powerclaw. What should i run for a helix at 6-9000'? I have a shift assist, Rock rollers, and speedwerx H5 springs in primary and secondary with stock rates. I just got a straight 36 but haven't installed it yet. Is this what I should use? SLP recommends a 40/36 for all elevations so i was thinking about going with that so i dont have to switch out my helix when transitioning from riding at home 0-3000' and the mountains.

 

[RickM]

Xfire800

You didnt mention your primary clutching weights! But I think the SLP recommendation of the 40/36 will help you get on the pipe sooner. I have the slp pipe kit and im running the 40/36 progressive, and I like it. Just my thoughts, hope it helps you out. RickM

 

[XFIRE800]

Ya im not sure on the primary weights yet. i think my rpm's on the speedo are seriously messed up. After a quick run on hardpack it said my max was like 9210 one time This was 2 grams less than stock (75 gram weights, cat recommends 77 grams) at 0-3000'. I think i might just go back to stock settings with the weights though. I had 75 grams in last year when i rode at 3-6000" and pulled a max of 8150 in a climb and playing around in deep snow. Another question, how much would i be leaving on the table if i just left in my stock 44/40 at 6-9000'? Does the helix affect rpm's at all?

 

[RickM]

leaving on table

I dont think you will be leaving any thing on the table using the 44/40 helix,
how often do you come to the mountains? I would try it one trip any way just to see how it works, the 44/40 will just give you a little slower full shift.
If your really into tuning you may notice the difference, other wise ride it and enjoy the trip. RickM

 

[montanasledder]

Ordered the gold spring, Will give it a try. Hate the high engagment and clunk that comes with it

 

[XFIRE800]

I dont think you will be leaving any thing on the table using the 44/40 helix,
how often do you come to the mountains? I would try it one trip any way just to see how it works, the 44/40 will just give you a little slower full shift.
If your really into tuning you may notice the difference, other wise ride it and enjoy the trip. RickM

Not really into tuning the clutches, i don't know much about them. I will go probably 3-5 times this year. Thanks for the info, that helps a lot now that i won't have to switch helixes all of the time.

 

[XFIRE800]

uh oh i was looking at the parts fiche and its actually a 46/40 helix in there stock. Should i change that out for something different like a 44/40 or something else?

 

[RickM]

Xfire800

I think you will be fine, with your helix, I see quite a few flat lander sleds haveing a good time in the snowies, come on out, ride with your friends and compare the difference from S.D. and make a few mental notes, then you can think about changes, but you should be fine. I would be more concerned with being close with primary weight than changing helix's for several rides in the higher elevations a year. look on ebay or swap section here for lighter clutch weights.