Dutch Phi-nomenon – Corally RDX Phi 09

Rear
To handle the brutal power modern brushless motors offer Corally invested in an updated rear differential with 18 2.5 mm chrome diff balls in combination with thick 26 mm diff washers. The 18 balls run on two different orbits and the diff is designed without the usual and often fragile thrust race making for an easy to build set-up. In combination with the supplied Corally diff grease the item has a reasonable amount of lock upon building.

As with the front, the universal CVD driveshafts are equipped with plastic outdrive savers to avoid damage on the rear aluminium outdrives. New to the 09 model are plastic uprights with vertical ballstuds that do away with the machined aluminium/horizontal ballstud items found on the previous car. The rear shock tower is modified the same way as the front item: it sports more, and closer located, holes for the shocks in combination with new camber link positions.

Wishbones of the medium compound ‘35’ type are standard as well as the pre-assembled aluminium threaded shocks that only need to be filled with the supplied shock oil (unless you know better and just switch to the recommended oil for your track). Oh, we nearly forgot: the new rear shock tower also houses the body posts now. Corally did away with the bulkhead mounted brace and now uses shorter ones located on the shock tower. The result is a more precisely mounted body as shorter body posts are less prone to ‘swing’ like the longer ones found on previous RDX’s.

Like the front, the geometry of the rear was changed a bit. Whereas the old RDX Phi shows 2.0 degrees of toe-in, the 09 car has 2.5 degrees now. Also the wishbones sit around 1 mm closer to the chassis plate which in theory increases rear end grip. Roll-centre is adjustable via optional shims under the suspension mounts and by changing the upper camber links. Toe-in is adjustable via different pivot blocks (Corally #79728).

Finish
Our review RDX Phi 09 was topped-off with a Mon-Tech Nazda 6 body painted by Vesa of V-Dezign. Power came from a 5.5T Speed Passion Competition 2.0 motor, Team Orion Race Spec 3800 LiPo and one of the new LRP SXX TC Spec speedos. To make way for the long cables of the speedo and servo we slid the servo mount brackets all the way to the front but this is something you have to decide on your own – others may wish to have a more rearward located servo.