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Post by ryan on Nov 14, 2013 6:46:15 GMT -5
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Post by moofus02 on Nov 14, 2013 7:01:34 GMT -5
Crap that's cheep wonder if it's straight groove td like the one I got from you
Sent from my SPH-L720 using proboards
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Post by ryan on Nov 14, 2013 7:04:04 GMT -5
it is, and it is heaper. the last one i seen on this site was over 30 must have a sale going
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Post by waltinhawaii on Nov 14, 2013 11:37:56 GMT -5
ryan, do you have a link to the tgb rear pulley?
the one I linked to is 141mm diameter, which won't fit in the case, too big; but I can cut it down to around 128mm, same as the malossi OR. but I don't know if it will fit on the shaft and accept the clutch pack that I have.
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Post by ryan on Nov 14, 2013 11:40:45 GMT -5
the link i just gave you bud has the OD of pulley as 123.? basically 124. ive had these before and will work with any minarelli clutch and shaft
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Post by ryan on Nov 14, 2013 11:41:24 GMT -5
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Post by waltinhawaii on Nov 14, 2013 11:42:41 GMT -5
ooops, sorry! you already had it posted. will get one! thanks.
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Post by waltinhawaii on Nov 14, 2013 12:04:41 GMT -5
OK,Ryan, what belt should I get? I have a Hoca variator (for now) and that pulley you just mentioned above. this is a long case, 12" rear tire. I ordered a few 788 belts but I think those will probably be too short, I think I'll need something near 800?
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Post by ryan on Nov 14, 2013 13:31:49 GMT -5
with that pulley you will need a malossi OR belt forsure. its THE CHEAPEST way to get overrange without paying 400 lol. it works too trust me, also they are straight groove. purchase a malossi 815x17.5 belt it will be pricey but hey youll save about 250-300 in the end.
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Post by 190mech on Nov 14, 2013 19:21:50 GMT -5
I'm not a CVT guru,but I think a larger TD pulley gives a lower granny gear and a larger Vari pulley gives more overdrive,,they kinda work together,TD pulley spreads with speed,Vari pulley squeezes,a longer belt needs a bigger sheave on both ends..If a 17.5 width belt is used,ideally the Vari sheave should be that width in the closed position,TD is less for a good squeeze on the belt at start..As anything in tuning,its a big juggeling match for the best outcome...
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Post by 90GTVert on Nov 14, 2013 19:36:45 GMT -5
The Hoca is a little larger in diameter, about 2mm. I can tell you that a modified Hoca and a modified fixed half can push the belt so far that it will break. I did this numerous times on one of my builds. Had the same top speed with my modded $50 front pulley and a stock size TD as I did with the Malossi OR kit... I just couldn't go WOT without snapping a belt basically. I gave up on playing with belts when I ordered a 798 Gates that was shorter than my 788 Bandos. A 788 Bando would cover the entire surface of the Hoca before it snapped. Not sure how much longer the belt can really be before it could potentially come off. Sorry I don't have great info there, but stuff to ponder anyway.
As John said, the rear pulley is only going to give you more takeoff... not that that's a bad thing... unless the belt can travel farther toward the center of it. Never tried any larger rear assemblies other than the OR or the Hoca. The Hoca is pretty much a stock assembly with a straight groove TD, and little nicer clutch, nice bell.
Be careful with wide belts. The Hoca already sucks with a stock 788 17 28 belt for takeoff unless you use spacers. Go wider and you kill acceleration. Could be good if you just want top end, assuming it fits down low in the rear pulley when opened. I'm fat so I need the takeoff most and I never play with wide belts really so I can't tell you for sure. I know the stock belt usually seems about right for a rear pulley setup that opens to it's potential. There's a Polini 800-16.6 that was pointed out in one of the threads around here from Racing Planet USA. There's a 10% off code for Nov for them too. I lost it though. Copied it to paste in a thread then forgot and shut the computer down after I had deleted the email. Oops. Anyway, someone may have it here if you do decide to order there.
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Post by ryan on Nov 14, 2013 20:07:43 GMT -5
with the TD i posted i tried the 800x17.5 stage6 belt and was too short..popped in a 815 malossi and was on par with what i saw with the OR. just wanted to point that out
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Post by waltinhawaii on Nov 16, 2013 11:35:13 GMT -5
Brent and John: thanks for your suggestions! I am a total newbie to the CVT thing, never had to tune one before. Am reading everything you post on that issue with great interest. I don't have a good understanding of how they work yet. I'll need more seat time with one. ryan, where do you pick up the 815 OR belt from? I checked ebay and there was nothing. a seller there does have a lot of very inexpensive belts though (kevlar!), I emailed him and he says he does not have those size belts, the closest he could point out to me were here: shop.polybelt.com/815-20-32-CVT-Variable-Speed-Belt-B815-20-32CVT.htmbut I can't tell if these are kevlar or not; plus they are very wide. I don't think I would be able to cut them down to the correct width. Well, actually I guess I could make up a small jig with a used pulley and grind them to size, but it would not be the easiest thing to make. I guess once I find out how much $$ the OR belts are, I'll make up my mind on the jig. |
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Post by 90GTVert on Nov 16, 2013 11:49:28 GMT -5
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Post by waltinhawaii on Nov 16, 2013 16:04:32 GMT -5
Time to install the taller primary gearing. Stock gears with cover removed:  Stock primary gears on left (13/52) and new Top gears on right (15/50). I thought the gears would just drop out, but it turns out I had to press the primary input shaft (the one with the clutch on it) out of the case, it was very tight and a plastic mallet would make the other stuff jump out of the case but the shaft/gear refused to move. The secondary could be taken out easily by hand and required no pressing.  The primary has a bearing on it, which required taking off an external snap ring to get off the shaft(it's on the far side of the bearing in this picture, you can't see it):  It turns out the bearing was very 'notchy' when I spun it. thinking it was dirt in the bearing, I cleaned the bearing thoroughly and spun it; it still had a very regular and mean notchiness to it. Have to replace this bearing. The other big bearing in the case on the secondary shaft also had a slight notchiness to it, so might as well replace that one same time too. but the secondary bearing is in a blind boss and I don't have a dent puller to grab it to pull it out. Any suggestions on how to beat that bearing out?  |
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