As you can see, I also run the Bosscat diff. The 5mm "high torque" Schumacher belts are fine for brushless if they're tensioned correctly. It's the long belt which is the weak point I think. If you swap out the 7mm belts you can use a 6mm long belt with no modifications.
SDPi do a 323T one in neoprene and a 324T in kevlar/polyurethane but I'm not sure if that would be too long.
btw the reason I only use 320T is because I use a smaller front overdrive pulley.
Watching your thread with interest, keep it up.
Thank you Kaszal, this is hard core info. I had no idea the long belt was the weaker one in this set up. I will try the 5mm Hi Torq belts and get a belt from SDPi. I will try to figure out if there is any need for a longer belt in my case. Ither I can go with your set up or I will have to get a longer belt. Intriguing...
I'll post updates as often as I can, the next challenge is to fit all the electric gear in the narrow chassi. And oh, I sneakily hacked out some copies of your neat carbon fibre bellcranks. Great design indeed! I made mine from 2x2=4mm carbon. Are yours even thicker? It kind of looks that way from the pictures.
The steering cranks are 5mm thick. Everything carbon fibre on my car you can get from Fibre-Lyte. They do superb quality work.
I think the 6mm wide long belt is less likely to slip than the 4mm standard belt. This means you're preserving the pulleys and you don't have to run it so tight, giving a more free drive train. Again, just my own theory.
I recently swapped out a 6.5T for a milder 10.5T motor. In my opinion, the car doesn't need the power and I'll drive more smoothly.
I also made this modification to the front suspension. This stiffens up the front uprights, making the dampers more effective, and still allows the crashback assembly to pivot back. Thanks to Jimbo for the idea!
Very good ideas, it makes sense to limit the power somewhat to smoothen the driving and thereby put less crazy load on the transmission components. I will try this belt approach with 5mm short belts and 6mm long belt. I noticed the special support collar i alu on your layshaft, is that to allow for the wider long belt and also avoid wear on that part? Was it RW who made that one for you?
In terms of the overdrive pulley you use up front, I take it there is no equivelent Pro diff pulley? So basically, in order to use the overdrive approach on the front end of a Bosscat one would have to use a Procat diff. Also, I noticed that your car is lacking the one way bearings on the front axle, intriguing... I suppose you've experimented with this and have come to the conclusion it runns better that way.
The equally simple yet ingenious soultion to the bracing of the front shock towers with a ball link made me smile. Absolutely brilliant!! I will do that mod for sure.
The main reasons I use the overdrive pulley are because the tooth form is better, it's wider (for the 6mm belt) and it takes the super-diff alloy washer carriers, which are super smooth. The extra drive to the front doesn't hurt. However, for your Bosscat the normal front pro-diff should be perfect. Whoops, I forgot to mention the alloy collar, which is made by RW. You need it to space apart the layshaft pulleys. It's on my oOple thread somewhere. Darren (Dazzieboy) on the Schumacher forum did the same thing. If you really want to go crazy, sand the diff plates (or ask B-Fast to do them for you) and install ceramic diff balls.
I did away with the front one-ways long ago. I feel these aren't needed for the high grip UK astro tracks.
My main problem with the Procat has been getting the set-up dialled. My Laser FS2 is much easier to set up and drive. I'm using Tamiya TRF shocks and Darren's using Cat SX shocks so it's difficult to compare.
Yeah, I like Jimbo's turnbuckle mod. So simple yet effective.
I've experimented with a few different materials for the long belt. In the end I found a 6mm Kevlar reinforced Polyurethane belt, which is grey NOT orange. It has a higher modulus and you can feel it is less stretchy than the orange belt (polyester reinforced polyurethane)
I used 320T for my Procat but check your Bosscat, it might be different.
I did some meassuring on the Bosscat Pro Diff pullies to see how much width there is available after fitting the 7mm rear belts. If I would keep the belt fences (and I should, shouldn't I?), there isn't much more space for anything wider than the 4mm standard width belt. I assume that the Procat Diff is providing more width for a wider long-belt or that the 7mm wide belts I use are creating the difference.
However, I can still use a modern Polyurethane belt of your recommendation from SDPi as long as it stays 4mm wide.
Another learning from comparing Bosscat anatomy with Procat anatomy; the long-belt length is seemingly different. I read 323 on my old Bosscat belt and you are using a 320 belt in your Procat. I take it they are not eaqually long then. That's good to know.
I had an idea after studying the exploded view of Schumacher Riot; it would seem like it has very similar but updated drive shafts/yokes. However, it also seems like they are beefed up and that makes me wonder if it would be possible to mix in some of these parts in our Retro Schumachers? The Riot wheel axle seems to be beefed to 10mm diameter, which rules out the use on Works Bosscat rear hubs which only have 8x12mm bearings. At the Diff side of things it would seem like the alu yoke could fit, at least it appears to have the length of cougar 2 Gear box yokes. What is really confusing is the cross interface at the end of the axles; is it larger diameter and if so; will it fit the old standard wheels?
A lot of questions here, but it would be great to have readily available, and uprated axle components for brushless use of old Cats. Have you tried anything like this on your Procat??
/ RM
RM,
Sorry to bother you, but I was just wondering if you had any luck with the drive belts (long and short) I am now having to source a belts for a CAT XL, and hopefully the ones you were recommended work?
How is the build coming along?
I've experimented with a few different materials for the long belt. In the end I found a 6mm Kevlar reinforced Polyurethane belt, which is grey NOT orange. It has a higher modulus and you can feel it is less stretchy than the orange belt (polyester reinforced polyurethane)
I used 320T for my Procat but check your Bosscat, it might be different.
I did some meassuring on the Bosscat Pro Diff pullies to see how much width there is available after fitting the 7mm rear belts. If I would keep the belt fences (and I should, shouldn't I?), there isn't much more space for anything wider than the 4mm standard width belt. I assume that the Procat Diff is providing more width for a wider long-belt or that the 7mm wide belts I use are creating the difference.
However, I can still use a modern Polyurethane belt of your recommendation from SDPi as long as it stays 4mm wide.
Another learning from comparing Bosscat anatomy with Procat anatomy; the long-belt length is seemingly different. I read 323 on my old Bosscat belt and you are using a 320 belt in your Procat. I take it they are not eaqually long then. That's good to know.
I had an idea after studying the exploded view of Schumacher Riot; it would seem like it has very similar but updated drive shafts/yokes. However, it also seems like they are beefed up and that makes me wonder if it would be possible to mix in some of these parts in our Retro Schumachers? The Riot wheel axle seems to be beefed to 10mm diameter, which rules out the use on Works Bosscat rear hubs which only have 8x12mm bearings. At the Diff side of things it would seem like the alu yoke could fit, at least it appears to have the length of cougar 2 Gear box yokes. What is really confusing is the cross interface at the end of the axles; is it larger diameter and if so; will it fit the old standard wheels?
A lot of questions here, but it would be great to have readily available, and uprated axle components for brushless use of old Cats. Have you tried anything like this on your Procat??
/ RM
RM,
Sorry to bother you, but I was just wondering if you had any luck with the drive belts (long and short) I am now having to source a belts for a CAT XL, and hopefully the ones you were recommended work?
How is the build coming along?
Hi!
I haven't ordered the belt just yet, I need to better meassure what length I should go for. I fully trust Kazsal's theory on the wider option though. The build of the Bosscat/XLS is resting a little while as I need to finish of another build first. However, I aim to resume and complete this one soon.
Your CAT XL renovation looks promising! That car is a nice find!
Decided after finishing my undergrad to by myself a graduation gift. I could not have been happier with the bosscat i found on another site. I was planning to run around the local track but we will see. I only with I knew Jaydub was selling his...
Won a bosscat cf chassis on ebay sweden. Figured the price was too good not to give it a shot and figured it would be a nice project. I know some parts for the bosscat were also used for the cougar 2 and club 10. Was anything shared with earlier or...
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I've been looking for cougar parts on ebay uk but nobody seems to ship outside the uk, so slightly frustrating...
I find that if you contact the sellers on Ebay UK and ask them to open up the listing to Europe, explaining that you are prepared for...
I am rebuilding my old Bosscat. I need some diff. pulleys, front and rear. And the layshaft pulley.
Does anybody know where to get these items, either plastic or preferably aluminium? Perhaps something from another schumacher model?
Peter K
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I got a pair of alloy ujs, now to get a shell and paint it.
