Clutching ?
- Thread starter damx
- Start date
You may even be less on both ends. Why such a low engagement? and a 275? What gram weights are you running
71g in tri city weights. And I'm at 8500-8550rpm. And I don't have more washers to add for weight. So plan is to put on the 75/275 that should bing my rpm down to about 8000, then I can remove some tip weight to bring it back up to 8200! Hope it works.
Ahh. Kinda in same boat. But I'm gonna try a 120/320 from slp
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G
I was told the original spring included in their kit was a 60/230. Engagement around 3500. Profile effects engagement and shift as much as spring.
Apples to oranges but I use a 75/275 (high spring rate, low spring pressure) with different weights (set at 63.8gr). This gives me 3200 engagement and 8050 shift.
Same spring with 66 gr series 10 weight gives 2900 engagement and 8250 shift. Belt slip included lol.
Apples to oranges but I use a 75/275 (high spring rate, low spring pressure) with different weights (set at 63.8gr). This gives me 3200 engagement and 8050 shift.
Same spring with 66 gr series 10 weight gives 2900 engagement and 8250 shift. Belt slip included lol.
Geo from what I was told tri city had problems with that spring braking so they have a different one now. Rooster built uses the tri city weights 100/340 primary, team red dark blue 140/200. And not sure the helix angles.(there around the 4000-7000') I'm lower elevation 0-4500' I now have a 110/290 poo spring, to try out next season. What kind of primary are you using? I like the lower starting rate.
G
Ya, I got my info from Brew too. I was very tempted to try those weights early but they remind me of two other sets I have (MDS and MTX) in theory-design but way more adjustable for weight position (a good thing).
I feel I've just played with these for too long lol. IMO always a compromise in one area (heavy load- light load) and quick to show a HP loss (elevation changes, RAD changes, covered intakes lol) but when set close they work well with stock modern secondary set-ups (stiff IMO) and that is what they were designed for.
Rooster, Carls, MDS, SLP, Poo all offer great packages with their own twist. The term "package" means all the components. As soon as you decide to eliminate or change one component you take matters in your own hands. So be ready if you decide to mix and match.
My primary set-up right now is Thunder Products HH weights set-up to 63.8 gr (pretty even spread of weight). I ride 5000 to 6500' primarily. My motor is stronger than stock and I'm geared a 2.33 to 1.
I have a machined and balanced P85 with a 911 TP cover. The spring I use is a Cat gold (75/275. bigger ID so less rub on the spyder nut, only 5.75 coils so never a coil bind issue). When installed in this clutch with a single glide washer in the spyder it becomes a 95/ 295. When I'm surprised by a heavy spring dump or in the middle of a perfect storm sometimes I pop the primary cover and add a glide washer or 2 ( each shim adds about 12 lb to each end of the spring #). I call this my clicker set-up with out the ramp angle change lol.
So Dmax, what I am saying, all that gobblity goop above may mean nothing to you because 1; you ride at a different elevation, 2; you probably weight different, 3; you may have different HP, 4; you probably have a different secondary set-up, 5; you are using different weights.
I would suggest you get the rest of the package from Rooster if that is your pick and start there. They have done the testing and have feed back from customers like yourself. That gives them the best chance to answer your questions correctly.
Probably your shortest route to the end you want. Probably the cheapest route too lol.
Hope it helps.
I feel I've just played with these for too long lol. IMO always a compromise in one area (heavy load- light load) and quick to show a HP loss (elevation changes, RAD changes, covered intakes lol) but when set close they work well with stock modern secondary set-ups (stiff IMO) and that is what they were designed for.
Rooster, Carls, MDS, SLP, Poo all offer great packages with their own twist. The term "package" means all the components. As soon as you decide to eliminate or change one component you take matters in your own hands. So be ready if you decide to mix and match.
My primary set-up right now is Thunder Products HH weights set-up to 63.8 gr (pretty even spread of weight). I ride 5000 to 6500' primarily. My motor is stronger than stock and I'm geared a 2.33 to 1.
I have a machined and balanced P85 with a 911 TP cover. The spring I use is a Cat gold (75/275. bigger ID so less rub on the spyder nut, only 5.75 coils so never a coil bind issue). When installed in this clutch with a single glide washer in the spyder it becomes a 95/ 295. When I'm surprised by a heavy spring dump or in the middle of a perfect storm sometimes I pop the primary cover and add a glide washer or 2 ( each shim adds about 12 lb to each end of the spring #). I call this my clicker set-up with out the ramp angle change lol.
So Dmax, what I am saying, all that gobblity goop above may mean nothing to you because 1; you ride at a different elevation, 2; you probably weight different, 3; you may have different HP, 4; you probably have a different secondary set-up, 5; you are using different weights.
I would suggest you get the rest of the package from Rooster if that is your pick and start there. They have done the testing and have feed back from customers like yourself. That gives them the best chance to answer your questions correctly.
Probably your shortest route to the end you want. Probably the cheapest route too lol.
Hope it helps.
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Rooster's kit works pretty damn good and in all areas power, loads, etc.. It's too bad the lower engagement spring doesn't hold up better.
I bought the complet kit from RB. It came with 100/340 primary. But was very high rpm 8500, want 8000-8200.They suggested the 110/290. Before I would put the 75/275 I would talk to them as I'm not the greatest with clutching. I also have extra washes to add to the weighs now,but snow is gone here, so ill fine tune next year. They been great to deal with. As for there kit. I've tryed 4 different ( kits ) this is the best clutch set up I have tried for my style of riding, awsome on/off responce. Reason I would like a lower start rate on the primary is because I like about a 3200-3300 engagment. With the 110/290 I'm about 3500-3600. So was hoping I can use the 75/275. Lots of good info to learn over the summer.
G
If that is the Cat 75/275 then installed in a stock Poo clutch it is closer to rate it as a 90/290 spring. Compared to the 110 290 Poo spring it will be about 200 less engagement and the higher spring rate ( approx. 190 lbs per in. for the Cat spring and 165 ish for the Poo spring) will keep your shift r's 100 to 150 higher until closer to full shift.
One spring I used with MDS weights for a few years was a new era Cat silver. Installed in a Poo clutch it would be about a 95/205. You would have to be able to keep your weight loading in mostly (if not completely) the heal. Definitely it would be 3 or 4 grams lighter but can be doggy (backshift) if the Tri-city weights don't roll back as easy as MDS weights.
One spring I used with MDS weights for a few years was a new era Cat silver. Installed in a Poo clutch it would be about a 95/205. You would have to be able to keep your weight loading in mostly (if not completely) the heal. Definitely it would be 3 or 4 grams lighter but can be doggy (backshift) if the Tri-city weights don't roll back as easy as MDS weights.
My wife's stock tri city kit was a 100/340 primary and a black purple spring with stock helix. We unload at 8000' and end up riding from 9500-11000' for 75 percent of the day. That was put in 2012 Christmas
Yes. Worked nice but couldn't keep them from breaking.
Running these flyweights at lower elevations with any added power (pipe, head etc...) is a bit of a challenge with the limited spring selection in this range and the arms are maxed out with the currently available weight materials. Looking forward to working with Damx next season to finish getting his setup dialed in with his other add-ons. Just dancing around that sweet spot!
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