One reason I bought the 1/24 Losi Rally X was I wanted to see if there was a noticeable difference in the handling between the two. The Losi has oil filled shocks, the ECX has friction shocks. The chassis of the two are very similar but most parts are not interchangeable without some modification. To make this more apples to apples I used a fully charged 4.8v NiMH battery in both. The Losi Rally X comes with a 2s 7.2v lipo battery. The ECX Roost comes with a 4.8v NiMH battery. The Rally X also have a brushless motor and the Roost with a brushed motor.
I started with the Losi Rally X and it had plenty of speed and power coming out of the corners using the 4.8v NiMH. The Rally X handled really well. It was as much fun to drive with the NiMH as with the lipo even though it didn’t have as much top end. The car handles real well in it’s stock form. Nothing was changed other than the battery.
Next came the ECX Roost also running the same 4.8v NiMH after it had been charged and a set of Losi Rally tires and wheels. The Roost has always been a little on the squarely. At times when you give it power it effects the steering, not by making the rearend stepping out or anything like that but the esc would rob power from the steering servo. This really manifest itself when the battery get low. I had learned how to deal with this for the most part, I also have the ECX Torment which has the same behavior.
Conclusion: The Losi Rally X handles better hands down. Don’t think the shocks has as much to do with it as the steering issue of the ECX Roost. There is a big difference in price between the Rally X and the Roost. The Rally X sells for $174.99 and the Roost for $79.99. At twice the price is the Losi Rally X worth the money? Can’t really say if I drove both and them had to decide which one to buy I am not sure what I would do. However if you are patient you can find a NIB Losi Rally X for much less for instance I picked mine up from Horizon Hobby for $134.99. At $55 difference the decision gets much harder. There are a lot more aftermarket parts for the Rally X also so that to is something to think about.
I have my ESCs modified to also run on a 2s 7.2v lipo using a BEC set to 5v as to not burn up the rx/esc. I need to add that into the mix to see how it compares. As I remember the steering was better using the BEC though because the BEC was set to 5v the speed wasn’t that much more.
Added the BEC set to 5v and tested the Roost using a 250 mAh 2s lipo. Set this way the car was very responsive and might have driven a tad bit better than when using the 4.8v NiMH. The speed was very similar to the NiMH. The BEC as mounted in the battery compartment with the battery strapped on top of the esc/rx. This did raise the CG asI rolled it several times and this had never happened before.
Next I mounted the BEC on top of the esc/tx and wanted to try it with the BEC set to 6v. Just looking at wheel speed it didn’t look that much faster. On the track it was almost uncontrollable so there was no way to tell just how fast it was. The steering was way past twitchy it you just burped the throttle the wheels would turn right, it would do this without even touching the steering wheel. Set it back on 5v same setup and it was much better but still had a tad of twitch in it. Didn’t get to try it on 6v with the BEC mounted in the battery compartment. It would be much easier if the BEC was mounted on top and the battery in the battery compartment. With the BEC in the battery compartment it makes switch the batteries at little tougher as you have to remove the body.