Shimming

Posts: 219

Okay.lighter rollers must be the way to go.I feel stupid.Sorry for any input or experimentation. Embarassed

Posts: 114

Yo Ken! I hope you didn't take my last post as in any way contradicting or demeaning! I was responding to jtsuttle's post, he was unsure of a few things. Your experimentation is to a GREAT degree the reason I started with this. After I saw what a wonderful difference the shim made, I messed with this new spring, and roller weights, and liked what it did. The shim alone is THE best bang for the buck by a longshot. If someone wants to spend money, then adding the rollers and clutch improves on that, and the new spring is only another way to increase the tension, same as the shim. I like the spring, partly because the chinese have a little trouble with good metallurgy, so I am concerned the O.E. spring may not like the new tension level, and the new spring, being designed for this, should perform better. If I offended you in any way, or you feel I belittled your experimentation, please forgive me. Nothing was intended. Your posts are highly valued, Carl Confused

Posts: 26 · Bronze Member Joined: 08 Jun 2005 Posts: 26 Pictures: 0

I put my shim in and was able to test it this weekend. It was a very noticeable improvement in my low end power. Made it up hills that I was unable to climb before. I still want more power low end. Could I also add lower roller weights in addition to the shim, how well would these two mods work together?

Posts: 368

Thanks for all your input guys, especially to kammak for taking alot of the "guess work" out of the right size shim. Input from you all has given me alot better understanding of how a cvt actually works. I had it all backwards until this thread. I hope I didn't get the thread too far off topic by putting all my questions in the same place. I'm gonna try the 1/4 and 5/16 shim soon (hopefully this weekend) and I'll let you all know how it works out. Thanks again for all of you guys help.

Posts: 114

g. vaughn, On my cart, I did a spring(same effect as shimming) and rollers along with a clutch. The clutch engages at a slightly higher rpm than stock. The rollers work well with the shim. When I did the job without the new clutch, it also worked well. The main differencce is with the old clutch engaging earlier, the clutch engages, then the engine then revs to the higher rpm point at which the variator has been tuned(by the spring and rollers) to begin changing the gear ratio. After installing the higher rpm clutch, the transition is smoother. The new clutch also has semi metallic pads, so it should last longer and slip less. Hope this helps, Carl

Posts: 219

I am still going to to be doing the clutch and I guess I should try the lighter rollers and spring as bergymon suggests.He has tested and is pleased with his results such as I was happy with mine.Therefore we are doing what we set out to do is"improve together".I'm sure it will work, I was just always a little shy about lighter clutch weights but bergymon has always had my respect for his knowledge and the support he has givin me.
I'm just trying to get through the camshaft selection process and milling the head.Then on with the clutching.
Ken

Posts: 114

Have you found diffences in cams?There are a few out there; eastside, james lee, mrp, and now blade sells one. I wonder what the differences are, if any. I see their is a post where Miamimoto was asked for the cam specs, and says they will post. Carl

Posts: 219

I was letting kell finish the results of his study on cams.I think they should be measured by 1 person so they are measured the same right across the board.If kell hasn't recieved enough info to do a fair study.I will purchase two cams from 2 separate suppliers and give those results along with my stock measurement.You being a mrp dealer should get there's and we can communicate the same manner of measurement along with 2 that I selected.There are enough buggies around here to deal the other cam I didn't use.
Ken

Posts: 186

Just want to get it right before i do this this weekend! If i got it right the shim slides over the sleeve then the spring slides over sleeve? I am trying to get a little more bite and acceleration. I thought i woul try this and see how much it helps before i go with possibly 10grm. rollers or would anyone recomend doing the rollers at same time? This is on a 2005 twister. I would be very thankfull if some one would replie. Very Happy

Posts: 6278

It would be more noticeable if they were done at the same time.