Any team building a BTCC touring car to the NGTC regulations has to use the new standard “TOCA” front and rear sub-frames no matter what model or make of car they are building.

These subrames are the mounting points for the entire suspention assemblies and the front subframe contains the engine and gearbox mounting points.

This commonality of suspension between all makes of cars will ensure that no cars built to NGTC regulations will have an advantage over another car due to the suspension the standard road going car uses. It should ensure a perforance parity and help guarantee close racing. Something the BTCC has been renowned for during its history.

So lets take a quick look at the “TOCA” front Subframe.

Photos kindly provided by Matt Neal on Twitter (@MattNealracing)

1, In this photo you can see the purchased front sub-frame laid out in front of the Civic shell. It is actually positioned 180 degrees out, to how it will be fitted to the shell. Note how solid the construction of the sub-frame is and the diameter of the tube  used. It is interesting to compare the engineering of the sub-frame something that Dynamics cannot control to the engineering of the roll cage inside the shell which dynamics can contorl. The engineering here is obviously “belt and braces” and is “over engineered” to what would actually be required,  However as this part will be common to all NGTC racers, there is no competitive benefit for it to be particularly light or refined.

2, Here you can see the connection points where the subframe connects to the welded in cage. Each of these points has to tie into the role cage to ensure the car is stiff and that there is no deflection were the subframe meets the shell. The roll cage will be specially designed to tie into the subframe at these points.

Looking at this joint I don’t think it is impossible that we will see one of these sub-frames torn completely off a touring car in an extremely violent crash…

3, Although this point is not related to the subframe, I think this photo shows quite nicely how tight the roll cage  has been designed, look at the gap between the roll cage to the “C-pillar” of the shell.  The reason the cage has been designed like this is for weight saving and to try to keep the center of gravity as low as possible and towards the center of the car as much as possible. The down side is however should one of the Civic’s roll over potentially the whole corner of the car could be deformed inwards and require this entire corner to be cur out and be replaced for new.

4,  Here you can see the mounting point supplied on the subframe for the Xtrack gearbox.

The yellow dotted lines on photo 5 show were the shell would normally be and where it has been cut away to allow the new sub-frame  to be fitted.

The above photo shows the receiving pointing points on the Civic shell itsself. where the “TOCA”  Subframe connects to the roll cage in the shell. You can see that each of these points is tide into roll cage.

It is obvious that Dynamics have carefully though out the roll cage design to ensure that the subframe ties securely in to the shell.

Feel free to leave any comments below or email me at btcctechnical@gmail.com. Also don’t forget to follow me on twitter: @btcc_technical!

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