Black Purple secondary spring question?
- Thread starter towngrunt
- Start date
I added a blk/prpl and 3 delrins.
I noticed a harder backshift.
I did not notice much more RPM. But 50 could be possible, just hardly noticed..
I think the spring swap is a preference thing, as I'm not sure it really makes a 'huge' difference. Maybe at different (higher) elevation, or maybe it compliments different weights better.
JMO.
I noticed a harder backshift.
I did not notice much more RPM. But 50 could be possible, just hardly noticed..
I think the spring swap is a preference thing, as I'm not sure it really makes a 'huge' difference. Maybe at different (higher) elevation, or maybe it compliments different weights better.
JMO.
T
towngrunt
Well-known member
I spoke with Starting Line today and they said to run the Black Purple and only one delrin in the secondary. Place the delrin between the clutch sheeve and the brass cup that the spring seats in. They said clutch worked better with one than all 3. They felt there was to much coil bind with all 3. I will give the one washer and the spring a run this weekend and see how it works.
An easy way to think of driven springs is this...higher the initial number the slower your clutches will "upshift", lower the number the faster the "upshift". For the secondary number or finish rate, the lower the number the slower you "backshift" and the higher the number the harder and quicker "backshift" is achieved.
i.e. The stock spring is a 155/220 (been a while but I think this is correct) and the Black/Purple is a 160/240. While you aren't going to notice much with the sled upshifting, this slight difference may be where you see a small gain in RPM's, the backshift is quicker, resulting in more consistent RPM's once they are acheived and the sled is subjected to a fast change in load on the track.
Another thing to think about is how Polaris and Team are equating there compression numbers in lbs. Not sure on the secondary springs but I know that a Blue/Pink (140/340) SLP spring is actually more along the lines of 140/360ish as evaluated using the Polaris specs.
i.e. The stock spring is a 155/220 (been a while but I think this is correct) and the Black/Purple is a 160/240. While you aren't going to notice much with the sled upshifting, this slight difference may be where you see a small gain in RPM's, the backshift is quicker, resulting in more consistent RPM's once they are acheived and the sled is subjected to a fast change in load on the track.
Another thing to think about is how Polaris and Team are equating there compression numbers in lbs. Not sure on the secondary springs but I know that a Blue/Pink (140/340) SLP spring is actually more along the lines of 140/360ish as evaluated using the Polaris specs.
S
Sixat38
Well-known member
I've had the Blk/Pur spring in mine twice this year for a total of 4 rides. Both times my clutch temps went up about 15 degrees. Both clutches. If your clutches are relatively cool to begin with, 15 degrees is probably not a bad thing if you get a bunch more performance but I've gone back to the stock spring in the secondary. Although, I have a few different things going on now so I most likely will give it another go at some point next year.
Received the same information from SLP and looking at making the change.
Also thinking blue / pink primary spring.
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A team spring is measured the same as polaris on the secondary. I called team tech. SO a 160-240 polaris spring is same as 160-240 team. Polaris blk/purple were on backorder so I ordered a team.
I respect the guys at SLP a LOT... but "too much coil bind" is bull. You never shift the driven all the way out on your mountain sled... never. Well, that's not true, you do when you back out of the throttle, but then it doesn't matter.
If they say it works better with one in it then I believe them... I don't believe its because of "too much coil bind".
sled_guy
R
RockinMntKing
Member
I would venture to guess that 3 delrin washers is more of a waste then not working as good as one. I mean you put one between the cup and the sheeve which eliminates the binding, why put more its not going to cause it to become any smoother. But SLP may have a point as well that with three of them in there you are changing the overall distance by few thousandths possibly effecting the the performance.
You can get the coils in a TEAM to touch when you are racing back down the highway into Cooke, or Mirror Lake to the parking lot, just sayin'.
Run the black/purple with 64 weights and get the SLP 38/40 helix and use the 38 slot. It is where I ran last year and I have set my new Pro the same way. It gave me the wanted r's last year. Only been on a road ride this year, can't tell anything.
With regard to the Derlin washers, not only does SLP recommend one washer so does Team. You can run all three but from what guys are saying, you need to watch the ones that are under both ends of the spring. The spring is rough on the ends and can chew up the washer after time and be counter productive.
