Trinity Cat Pro Racer Diff and Top Layshaft Pulley Upgrades

[Incredible_Serious]

I have both of these upgrades somewhere, so thought you guys may be interested in these..... hoping that one day, I'll finish off my bling-bling alloy ProCat, including these parts...

[jeroen206]

[Eau Rouge]

Wow, I've never seen that kit with belts, too. Awesome!


So this item was sold by Trinity and TRC here in the U.S. and from what I could tell, MANY companies in the UK and abroad. Were they all made by one company (I'm assuming)?

[jeroen206]

Schumacher superdiffs

[jeroen206]

So this item was sold by Trinity and TRC here in the U.S. and from what I could tell, MANY companies in the UK and abroad. Were they all made by one company (I'm assuming)?

In Uk and holland they were distributed by MMS , but i think they were all the same.
I only used these diffs with the orange Trinity/wasp belt.

[terry.sc]

The superdiffs that Model Motor Sport sold were made by MMS themselves, so I presume they were rebranded as Trinity ones. The ones Jeroen has posted the picture of look like those are MMS header cards
Got an factory tour in one of my magazines somewhere.

Surely the hottest gearbox upgrade has to be the WASP high torque gearbox.

[jeroen206]

look over here http://www.racing-cars.com/forum/forum_posts.asp?TID=8029&PN=2
and then the second link.
Ian has still some for sale.

[Eau Rouge]

Yeah, I sent Ian my list on Friday and he said he'd look this weekend. He thinks he has a lot of it. I haven't heard back from him yet, so we'll see. I'm still planning on grabbing that lot of used parts on eBay just in case, though.

[phoenix]

So - what are your opinions on the best diffs for the cat? I am building two runners at the moment, which combination for an xls would be best for front/rear/integrator while not upgrading the whole rear end to a procat one.

Thanks for any input.

[dangermouse]

Phoenix for reliability, simplicity and easier maintenance not to mention a smoother transmission, I'd consider ditching the standard xls integrator and the diff in the layshaft. The front diff is ok, you can fit a procat front diff pulley which runs more diff balls giving a smoother action. Also there was a smaller overdrive front pulley available, if you can find it, to bias more power to the front.

The MMS/Trinity diff and one-piece layshaft work really well in a cat, only problem is no slipper. They take the earlier squarer (xls) toothed belt. They are machined and give a very smooth transmission. They are a huge improvement over standard xls transmission.

The procat three piece diff and matching layshaft are ok, you can get a replacement shaft for the layshaft to enable fitment of a slipper. These take the more rounded tooth high-torque belts. They are moulded.

One thing to use with either of the above setups is the hex-drive diff conversions that schumacher brought out. It replaced the glued diff rings (and carriers) with ones with center hexes for positive diff ring location. I always used to substitute the hex diff rings for losi JRX-2/pro ones, as they were a lot harder than the schumacher ones.

Another alternative would be to use the transmission out of a boss cat, as they had a decent slipper and were a lot better made than in the earlier schumacher cat models.

[phoenix]

Very helpful ! Thanks alot dangermouse !

[kaszal]

How's this for a late reply... over two years later?

I use a Bosscat rear diff with ceramic balls, 600 sanded washers and 4 large disc springs, Bosscat slipper, BRP orange long belt and MMS front diff. Works sweet.

[kaszal]

I always used to substitute the hex diff rings for losi JRX-2/pro ones, as they were a lot harder than the schumacher ones.

Hi Dangermouse

I got hold of some alloy hex carriers. Is it worth fitting the Losi hex rings? How could you tell they were harder? Did they last longer / less scoring?

Cheers

Luke