RSector High Traction System for F104v2
5 January 2013
This hopup for the F104 Pro v2 adds weight very very low to add rear traction and on power grip. We take it through its paces.
The new SR-F104-004 High-Traction System for the Tamiya F104 Pro v2 claims to increase acceleration and throttle response by adding weight over the rear wheels and giving the car more rear grip. Here's the review.
- Steel rear lower chassis x 1 - 58g (all weights rounded to nearest gram)
- Brass weight x 2 - 20g each
- Aluminum rear diffuser x 1 - 18g
In addition to making the rear more rigid, it also claims to provide better cooling by increasing the motor heatsink dissipation when running the alloy motor mount. Each part can be added independently or together.
John Papas tested at TFTR, a medium grip outside asphalt track, and found the real benefit with this part was that it is able to keep the car more stable particularly when hitting bumps on the track and under braking.
John also reported "There is one major issue with the part that needs to be modified. On the non-differential side of the car, the bottom plate does extend out to within 2-3mm of the tyre. What appears to happen is under hard cornering, the tyre will flex that much that the side wall will rub against the plate. This is particularly an issue with Pit Shimizu rubber as the tyre rubbed to the extent that it cut through the side wall. Ride rubber appears to flex a lot less and only showed minor signs of rubbing. I have now cut an extra 2-3mm from that side of the plate and have refitted. As the diffuser piece extends out as much as the bottom plate, it cannot be fitted. An alternative solution is to shim the rear wheels out 2-3mm or use the Rsector wide kit for the rear (which widens the car 5mm either side)."
Dave Stevens ran the rear diffuser only using Ride R1 rear tyres and, as expected following John's report, had no issues (presumably because of using Ride tyres). But a potential issue to watch if running this hopup with Pit Shimizu rears. Dave also didn't like the poor access to the screws that attach the diffuser to the chassis. While it is possible to use a hex driver on an angle it is not ideal. Dave took an old 2mm Allen key and bent it in a vice so that he could get a good connection with the screws.
Robert Barcikowski has also been using this hopup with positive results and Rob provided the test unit to RC Formula1 - thanks mate!
This is a great concept which offers some real benefits in grip. The parts are nicely finished but have some minor issues in terms of fit. There are no instructions.
Does the job. Could be better. Currently unique in the market.
I'm not a big fan of getting the grinder out on nice new bling in order to stop the tyre rubbing but if there's a grip advantage then I'm there! :)