01-27-2012, 09:39 AM
Join Date: Jan 2009
Location: Vancouver, WA
Skunk Works FGX
Prototype Rev 1.1 TESTING
The testing went very good. I ended up shaving a half second per lap through the night as I dialed it in. I am still off the pace of Mark and Rick but they have had there cars on the track for almost 2 months. This is my second week. I need a rear sway bar (no stock at TZ). I upgraded to the Rev 2 lower arms with the nylon balls and that smoothed out the front end a bit. The chassis is stiffer than stock and required a little more front neg camber for steering. As far as looks and electronics placement I am extremely pleased.
1. Stiffens front end.
2. Was able to run Duo 3 with up to 33 tooth pinion without shaving chassis.
3. Much cleaner electronics placement and better access to servo and linkage.
4. Looks good and is a great direct replacement.
5. Because the front upper arms mount directly to the suspension mount block I am able to raise or lower inner pivot point. I will test this more on Sunday.
Things I want to improve:
1. The front end still pivots on 2 center standoffs just like stock. No matter how stiff you make the top deck it is hard to control the flex between the top deck and chassis in the front end.
2. I am still thinking of ways to make a better top loading battery solution. I would like to eliminate the tape as well.
3. Next revision will have a way to tune the flex of the chassis through different top decks.
This is my second week with the FGX. I built it last week and ran it stock. The FGX is a great very inexpensive car and I like some things very much. The rear end is great. The gear diff was way better than expected. The linkage for the rear shocks is tight and precise. The servo placement is necessary but a pain with its linkage. The plastics are better than expected. The front end has some issues: to change caster you change wheelbase, the top deck pivots on two center points, no adjustable camber, and huge amounts of slop in the front axles. Another issue with the car is the lack of spacers between the bearings in the hubs. This means you cannot shim behind the pin. When you do and lock down the wheels it binds the bearings. A spacer in between (like on every touring car on the planet) would eliminate this and reduce the slop.
Great first night. So far I have a very good direct replacement for the stock chassis that improves clearance on the motor, electronics placement, and reduces flex. Next is making it even better with more tuning options and better battery solution.
Last edited by Troy Mckune; 01-27-2012 at 10:33 AM.