Where to start with clutching a SC Nytro?

[HAMMER]

Wouldn't that also help the over-rev on take off?

I haven't run Yam clutching in years but you might want to try the "short cover" O-P-O (30-135). Springs are the least expensive parts to experiment with. It may be too drastic with the smaller rollers but then again it may be just what you're looking for. The free length difference is 8mm, which in theory (that's why I say experiment) would bring your rpm way down out of hole.

 

[spray25]

Hammer what helix are you running?

Here's the short version. Started out with a straight 48 and a bunch of weight/spring combo's. Then went to a straight 52 and a bunch of weight/spring combo's. Then went back to the straight 48, a bunch of weight/spring combo's, and Supertips. Still not what I wanted. So went to a 58/42 full progressive and a bunch of different weight/spring combo's. Still not what I wanted. So I went with a 56/46 full progressive, 140-240 TEAM spring in the secondary, Supertips, with a polaris 100-275 spring in the P85 primary. This was close but still not what I wanted. Finally I went with a 56/44 full progressive, 160-260 TEAM spring in the secondary, Supertips, with a polaris 70-290 spring in the P85 primary. This is where I'm at now and I'm sure I'll change it again depending on how the nitrous affects my setup this season. Looking at buying a 54/42-54/40 full progressive to experiment with also. Total parts experimented with so far: 5-sets of weights (finally bought the Supertips), 7-primary springs, 6-secondary springs, 4-helixes (the TEAM helix has two different cuts per helix so thats 8 different cuts).

So basically you have not tried much of anything then?

 

[spray25]

Finally got to really run the sled today. I ran it with this clutching:

15.2 Heal
0 Mid
0 Tip

O-P-O primary
16.5 mm rollers
42 Helix
Pink Secondary at 70

At take off I was 9000+ and at full shift out I was around 8100+. It looks like the 60G super tips are just too heavy

I will look into either the 50's or hte new 55 G X weights tomorrow.

 

[Jonny Rocket]

Don't be a baby and turn the boost up to 14#'s. Then you won't have to worry about lightening up the weights.

 

[mulot30th]

Not sure if that can help.

but on my blower (twin screw) rx1 mountain..


I have 42degree roller helix (HCX) which is just about the same as 45 degree non roller.

I got 60 grams supertips loaded with two tungsten at base and four washers in middle, nothing in tip for a total of 81 grams per ramp on my scale.

that gives me just about what I want... 10400 rpms at launch and climbs to 10800 on top end.

 

[spray25]

Don't be a baby and turn the boost up to 14#'s. Then you won't have to worry about lightening up the weights.

Can't......Won't......SCARED!!!!

 

[Need for Speed 2]

Hey guys just chimming in here . I recently purchased a couple sets of Dalton weights after talking to Dale on the phone he explained as couple key points that the super tips are falling short on. I put in the weights that are adjustable in the clutch no removal . They are great easy to adjust in seconds mountain guys would love the adjustability with an allen wrench wich is supplied with each set. Untucked mass is more important than I realzed . price is cheaper than super tips and boy do the ever rip faster upshifts more bely force at engagement. Trust me these are the ticket for easy tuning and great results,

 

[spray25]

I can't seem to get the dalton website to work?

 

[TurboJamie]

I have the 55x weights in mine and even they are boarder line to heavy for the nytro with the OPO spring in and 1 in the tip, you can go with a helix that is easier to pull to get rpm up top.

 

[spray25]

Yeah, but I don't ;ike the idea of getting RPM from teh helix. Old rule is RPM should come from the primary. I was wondering about the 55X knowing you are border line, but running less boost than me. Also wondering about the 50 gram weights as well.

 

[TurboJamie]

I would say go with a ligher supertip go I think they make a 50 instead of the 66 or 65 whatever the base is.

 

[Srxspec]

You have two options of going to a 50 gram regular "Y" weight or I have specially made for Ulmer Racing 48.5 gram "YX" (new X series weights) as well. A "X" series weight acts about 5 grams or so heavier than it actually is due to the aggressive profile.

 

[Need for Speed 2]

Im telling you these daltons are the cats meow. get the rpms on the primary with the intro to all these compound angle helixes we are trying to tune rpms with helix wich is wrong when you hit the sweet spot its great quick up shift bang on the rpm desired reduce throttle rpms drop maintain speed I have a set up that just rips now Dalton green primary dalton adjust weights around 73gms supreme cat secondary with a blue slp spring and a 54-44 helix this is based on a cat roller set up. on an ape with 12lbs supercharged boost. it pulls up to 100 with any turbo now 10500 bang on the rpms cruising at 60 it revs around 6-6500 rpms

 

[spray25]

Allen,

Is that extra 5 grams near the tip the heal or spread out? I am so far below my target RPM right now that I am thinking I need the lightest tip I can get.

Either way it looks like I will be calling you a little later

 

[Srxspec]

5 grams heavier acting through the shift range with the more aggressive "X" series cams.