Originally Posted by FASTGIMS
I'm thinking on trying electric touring and would appreciate if anyone can tell me something about the RTR E4 JR is this car any good?.
It has a nice price and looks to be competitive!.
Any feedback would be appreciated.
I have the E4JR kit version. It ran good when I first got it. I used a brushless setup on it with a low profile servo. The RTR is a brushed motor with a standard servo.
The E4 in general is a little sluggish in the straights due to is three belt drivetrain but it transitions very well in the in a tight infield due to its centered electronics setup.
Things that are different on the E4JR vs. the other E4's are:
Top loading battery
I like this vs the bottom tray because of its convenient access. However, the thumb screws holding it are small and with big fingers a bit hard to unscrew if you need access to the battery in a hurry. Also there's a lot of flex and potention for flex on the battery cover if you don't screw it down tight which can affect your handling. It can also affect your steering because the steering bellcrank is mounted to the battery cover. Also if you're going to use the newer hardcased lipo, you'll need to shim the battery cover by 1.5mm under the hinge mount at the front. Don't flex or sqeeze the cover to fit because it will affect handling.
I have found the chassis to be somewhat not durable. There was good intention in the design but it doesn't work so well. I'm talking about the fact that the chassis is made of three pieces. A front piece, a main center piece, and a rear piece. The idea was that if you get damaged in a crash in the front or rear, all you need to do is just replace the modular piece. However, I've had those pieces damaged in such a way that it also ripped the mounts on the center section such that the center section would also need to be replaced, so no savings there.
Other than that, the rest is all standard E4 aside from the plastic bulkheads both front and rear and the plastic shock towers. Those pieces are all good.
The biggest advice I can give you is this: DON'T UPGRADE THE CAR WITH ANY ALUMINUM OR GRAPHITE PARTS!
The reason for this is that all the plastic parts work together perfectly. Once you stiffen one part of the car or another, the added stiffness or strength puts more stress on the other plastic parts it mounts to. Case in point, I upgraded to aluminum bulkheads and that resulted in more stress to the front and rear lower chassis pieces. I also upgraded to the graphite shock towers which mounted to the plastic upper bulkheads which mounted to the aluminum lower bulkheads. Guess what failed? The squishy part in between the aluminum and graphite.
Parts to keep on hand
Upper and lower bumper piece: This part is very fragile. Despite the foam taking the hit, the upper and lower piece tends to snap too easily.
Hubs and suspension arms: This is pretty standard for just about any car out there.
Front and rear lower chassis pieces: It shouldn't break so bad if you keep it all stock but its good to have them. You should keep more than one rear lower chassis piece because that one will break more often than the front.
Battery cover thumbscrews: These things are small and can get lost easily. The car won't run right if the battery cover is not secured using this. You can replace it with a 3mm locknut and use a nut driver instead of your fingers. Actually that may work better than the thumbscrews.
Enjoy the E4JR RTR as it is. When you are ready to upgrade, there are plenty of E4FS or RS available out there that can be had for a very good price.