SlotForum banner
1 - 5 of 5 Posts

· Gary Skipp
6,804 Posts
Discussion Starter · #1 ·
Hi everyone,

Firstly I've put this post in Racing & Tuning as the digital element of it is largely irrelevant. The spec is generic for any digital system.. but can also be applied to analogue racing :)

DiSCA has recently published it's 1/32 touring car regulations, which are chiefly aimed at the BTCC range from Hornby. We didn't want to call it BTCC because there might be other liveries or models in the future from other series such as WTCC and TCR Series (which is great, btw) where although the cars are slightly different externally they are all built on the same next-generation touring car (NGTC) platform, sharing common and spec parts. So, 1/32 Touring Car it is.


The formula allows for light tuning in order to compensate for manufacturing defects, out-of-tolerance parts and to perform handling balance adjustments.

A list of defining characteristics and current production models is given below, by which the admission of new models may be based on;

  • 60mm width
  • in-line s-can motor giving approximately 20,000rpm @ 12.0v
  • none-adjustable plastic chassis with rigid motor bracket and fixed axel mounts

As you may gather from this, the PCR chassis or 3D-printed chassis for these cars are not allowed.

Examples of models:

  • BMW Series1 BTCC
  • Honda Civic Type-R
  • MC-6 BTCC
  • Volkswagen Passat
We tested every model except the VW on a range of surfaces, although it was measured and analysed on the workbench.

Summary of restrictions and scope for tuning
  • Minimum body weight 25.0g
  • Minimum overall weight 75.0g
  • VW and MG may have the cockpit replaced with lexan, but must retain rollcage and driver's head
  • Original interiors may have material removed form the underside (bearing support legs, etc)
  • Body and chassis may be trimmed for fit and clearances (body rock)
  • Chassis may be cut our ground away directly beneath the crown gear to give clearance to the gear or to give improved ground clearance
  • Any 16.5mm wheel, including original equipment
  • Any 27z crown gear that centres using the motor shaft
  • Any 9z nylon pinion (original pinon or direct alternative)
  • Must use original front tyre, with logo. 19mm min diameter. May be varnished or glued, but not glued to the rim
  • PT1207 N18 tyre* for rear. Cannot be glued or treated other than cleaning with tape or lighter petrol
  • Any solid steel axel, any plain bearing (no ballrace, offset or combi bearings. plain brass or nylon ok)
  • Original motor

*our rear tyre spec for Ninco. Clubs may choose their own to suit the surface and parts availability.

This basically allows a more-or-less standard car (no posh bits) to race and be competitive. How do I know? Two Honda's and an MG didn't have a single part replaced on them other than the rear tyrers and ran comparable lap times with comparable handling feel than a fully kitted out and tuned BMW by the time we'd finished balancing the performance.

The reason we are allowing tuning parts in the first place is because some cars just don't make the grade out of the factory. From a pool of five cars we saw one bent wheel, one non-centered rear axel, one bent axel. Also, my Honda chassis broke beneath the rear axel mounts which I repaired by drilling a pair of holes to stop the cracks propagating further and filling with epoxy. It isn't mentioned in the rules but if this is a common fault it makes sense to allow this mod for the Honda.

The reason we disallowed PCR and 3D chassis is because things get very expensive and very complicated already. DiSCA already has GT3 and WEC to cater for full-blown car building enthusiasts, and as with the GT4 spec we decided a simpler, more cost effective solution was needed.

Also, the cars are really good enough..

I hope to add an in-depth post to this thread which gives details of all the measurements and tuning that was performed in arriving at this spec, but that will have to come later. For now I'll invite your comments and welcome any feedback from clubs or individuals already racing BTCC and what they do in terms of car specs. If you're thinking about starting a class for these models, add a comment with what you think about these specs.

For the full spec, visit the DiSCA website;

· Premium Member
1,046 Posts
I think these are great, especially for club use. As all members get a vote on what digital classes we run at Pantyffynnon I couldn't say if we'll be adopting this as a class soon. But I'm certainly keen and I'll be building a car or two to this spec to see how they handle.

It's great to have set of regulations all clubs can follow so that we can have some inter-club race day specials!

· ParrotGod
12,922 Posts
Good job on the specs. I think it is not mentioned so I will ask: Is it allowed to glue the motor to the chassis?

Also, I find it strange that the front tyres cannot be glued to the wheels: any particular reason for enforcing this?

Personally, I glue the front tyres because then I can true and cone them without running the risk that they lift from the rim.

· Gary Skipp
6,804 Posts
Discussion Starter · #4 ·
Hi Gio

On front tyres; once you've glued them, they're glued for good. You can't remove them if you need to, and this was one of the issues that essentially forced me down the path of tuning parts with my BMW test car. I am well aware of the advantages of doing so and with an open book would glue them my selves. However, this is not an open formula.

There is nothing that says you cannot glue the motor.

· Premium Member
3,814 Posts
It's a great spec Gary and very close to what we're looking at running next year at WHO/digital. The plan is to run three short races during each of our digital Saturday events and use RCS64 to simulate success ballast (as Gio has done) plus all the other BTCC option tyre and reverse grid stuff. BTCC won't be the main focus of our digital racing, but should be great fun with some superb new Scalextric cars.
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.