I did a comparison from my old RS4 Pro car to the newly / Christmas acquired TCX.
I took my trusty "old" and vintage HPI RS4 Pro out to my local hobby store/track. My intention was to use the same motor, speed control, tires and gearing in both the RS4 Pro and the TCX and see what comes of it. I used the stock setup of the TCX as per the instructions EXCEPT the shock locations. For that, I used what all the pros seem to agree on, #3 setting for both front and rear. I would have loved to set it up using the "base standard setup" of the pros but Hot Bodies, of course, didn't provide us with those same parts in the standard kit. How really annoying. Just to note, I don't know of any manufacturer who does do this.
So I get a lot of laps in my RS4 and was confident that I could get a comparison between the two. I probably had 250 laps or so with it. Most of them were timed. Of course, I grazed a wall or two now and then, but it didn't break anything. I ran ball diffs front and rear and full-time AWD (i.e. - removed one way clutch).
So I switch out the electronics and tires and put them into the TCX. The gearing was the same. I ran the standard spool in the front and the ball diff in the rear. My initial impressions were that it ran quieter and that the car definitely felt a lot more stable. However, the RS4 had more steering. I would assume that the ball diff in the RS4 helped with this. While the spool in the TCX helped with stability, I think it gave some away in steering. I would have loved to have been able to do timed laps with the TCX as well but... the freakin hub broke after a very soft tap at the 5th lap!
I was very surprised how brittle this part was considering that I grazed the wall much harder
and with more frequency with the RS4 Pro and broke nothing! In fact, in roughly 13 years of owning and racing the RS4 Pro, I don't believe I have ever broken a hub.
So far, my gripes with the kit are the following:
1) For $460, did not include parts that would be considered the "base setup" of the pros: 3 hole shock piston, shims/spacers, pink front springs, toe blocks, 40 wt shock oil. In fact, for that money it should have included a body, wheels/tires and at least the standard basic tools (1.5 mm and 2 mm allen wrench, cross wrench and turn buckle wrench. I mean, how much could these have been to throw in?). There is some serious markup in this kit.
2) Forwards and backwards play on all 4 shock mounts.
3) Play on the steering. I thought that the play in my RS4 Pro was excessive. I was wrong when the the TCX seems worse).
4) Play in the steering knuckles and C hub carriers. I don't know if other cars (TC6, Photon, Xray, Tamiya, etc.) have the same issue.
5) Brittle steering hubs
6) Putting a pinion gear on is a major PITA
7) The inside servo mount is awfully close to the belt. If I got to run the car long enough, I am betting there would have been some evident belt rubbing there.
Originally Posted by kid TT-01
Since the TCX uses the same knuckles as the normal cyclone. The weak point of the car in crashes will be the knuckles and c hubs. Other wise the car is flawless
Originally Posted by idbdoug
Yea, you better get some spares:
#73507 - CARBON GRAPHITE BLOCK AND HUB SET
Originally Posted by am
ok, looking into getting a TCX but evry were i look there seems to be difficult getting spareparts. Suspension arms, castor blocks steering knuckles and so on i out of tock evrywere. I need it shipped to europe, even A-main and stormer is out...
Has HPI/HB a parts problem at the moment?..
So I have this same issue... No one seems to stock the #73507 - CARBON GRAPHITE BLOCK AND HUB SET.
But as luck would have it, I bought some spare parts for the RS4 Pro that I thought "might" fit the RS4 Pro. These were the HPI 85092 - hub and knuckle set for the HPI Sprint 2... It DID NOT fit the RS4 Pro... But it's a direct fit for the TCX!!! Here's a link to the part.