If you intend to build an aluminum rig that you intend to run hard, do not cheap out and do some research to see what works well and what doesn’t or you are just setting yourself up for disappointment and $$ down the drain. If you don’t intend to go all out with good quality parts just build yourself a standard based basher with aluminum down the center and plastic on the corners.
I’ve spent about 14 hours and over a gallon of fuel the last 4 days at the track testing and setting up this mostly aluminum rig.
The only failures have been a ball end pulled off of a rear toe link (can happen on any rig) and a broken front wheel cvd. The cvd broke when I swapped out the aluminum front a-arms with RPM arms, a hard landing off a double jump and the rpm arms flexed enough to cause the cvd to bind. I put the aluminum arms back on and have had no further issues with the cvd’s.
Yes I have also bent UE a-arms; here is a lower arm I bent about 3 weeks ago.
Top arm bent
I took a big jump off center and landed on the corrugated pipe that outlines the track. Just so happened there was a piece of rebar sticking up about 2 inches above the pipe and the lower arm shock mount opening caught the rebar perfectly. The hit was so hard it sounded like someone was playing horseshoes and nailed a ringer (I could here it over the sound of the engine).
If an rpm arm had caught in the same area it may have slid off the rebar will only a gouge but if it caught the rebar like the aluminum arm did there is no question in my mind that the rpm arm would have broken. If you run aluminum you just have to be prepared to replace the part when you kill it. You have to expect it every now and then even with the good stuff if you run hard. I was prepared and had spares on hand.
There were quite a few people over the last few days who thought they were being schooled on the track by a truggy and went home scratching their heads when they found out it was a TMaxx based rig that was lapping them. All Aluminum can work well but only if you’re willing to spend the money on the good stuff and take the time/effort needed to set it up correctly.
Best part of my Memorial weekend was on the drivers stand when I overheard someone say several times “Watch out, that Truggys right behind you again”