Grass Drag Clutch Setup

[JHG]

I need some help with clutching theory for grass drags. Can someone tell me where to start? I'm trying to race in the mountain class at some local events. The first sled is an TM8. I'm guessing that there's not much I can do to this one, it's running a 36/44 helix I believe and clutch engagement is around 4300 rpms. I don't think I can change much of that and the sled still run right.


The one I have the most questions about is a bone stock M7 153. Where should I start with this one? Helix angles? Do I need different primary weight? Heel loaded, Tip loaded weight? Engagement RPM? Is low better or do you set it higher? What about the rear suspension setup? I ran my M8 pretty much stock last year in a local race and it didn't fair so well. I don't really have a place to test so I'm trying to get it close before we start heading to the races. Thanks in advance for any help.

 

[JHG]

wow....lots of good info, thanks

 

[JSCC]

In General, you run as much Weight and helix as you can. I also ran a really loose secondary aswell. Just to the point she would slip.
As for the TM8. Get you a little nitrous setup to help with the hole shot. Otherwise, get your engagment up to 5500. Run a reverse angle helix with a really steep cut on the final side. Load the piss out of the primary.

With both of them, try testing the rpm's around both peak torque and peak hp........ Set them up for 6" of ski lift.

My .02

 

[mattymac]

In General, you run as much Weight and helix as you can. I also ran a really loose secondary aswell. Just to the point she would slip.
As for the TM8. Get you a little nitrous setup to help with the hole shot. Otherwise, get your engagment up to 5500. Run a reverse angle helix with a really steep cut on the final side. Load the piss out of the primary.

With both of them, try testing the rpm's around both peak torque and peak hp........ Set them up for 6" of ski lift.

My .02

Couldnt have said it any better myself!!!

Pull motor to peak tq, and yeah dont pull ski's more than 6'' or so.

 

[JHG]

Thanks, that's what I was looking for.