To me the diff screw is similar in size to the TC3 one.
Ok, I got a race report from last night, didn't get in till around 1 in the morning so couldn't post till now.
My setup was as follows, anything not listed was set at kit specs:
40W All around
AE Silver springs in rear
AE Greens up front
#2 pistons in the rear
#3 pistons in the front
Front Shock Top mount in middle
Front Shock Lower mount in inner hole
Rear Shock Top mount in middle
Rear Shock lower mount in outer hole
The track was ideal for IFMAR stud tires but I had to run the stock units. The track had some big jumps, with a figure eight jump and two table tops. Very nice
I did some practice runs and managed to knock the motor out of its mount. I took it back in and put A LOT of threadlock on the motor mount screw. This did the trick as it didn't come out again. I do wish however that the spur gear included was the 72T one they list on the back of the manual for gear charts. The ones they include other than the biggest one are just not practical from what I have seen. Also since the holdown can losen up, I wouldn't be suprised to see a few stripped out spur gears. I think I am going to actively look into the KOSE mount and see who can get it for me as that mounting system looks to be ideal. I would also have prefered a recommended starting point for the various motors out there.
Here are some things I noticed:
The vehicle has INSANE amount of acceleration. Once you have that power put down, it really takes off extremely fast. Only thing is the tires were less than ideal. So I think a slipper would help matters alot as I had to be really easy on the throttle, but if you have an ESC that lets you set ideal profiles, you should be ok as once I changed this setting it really cleared it up alot and I think my tire change should also make a big difference.
My setup was off. It had good pack off of the high jumps, but on the sections of the track that were uneven it would get pitched around. So I am going to soften it up a bit and go from there. Once I was getting used to it however I could get it around the track quite well. The 19T Quad Mag really gave the vehicle good power. I think this motor is a good starting point to test it out.
One thing you will love is that this vehicle really loves to fly and fly true. No pitching to one side here. Each jump it took It was easy to land right as long as it wasn't setup for wrong ( ie- not enough speed to not land on top of another jump, OUCH! ). But if you did hit it wrong, in air corrections were fairly easy too.
I would change the wing as it has the degree setup on it, but the screws don't tighten down enough that it won't move in a hard crash. What I think would have been better would have been to have a locknut on the other side so it locks it down completely or something the screw threads into made of metal that you can put threadlock on.
I would also like to see a bumper that sticks out further to protect the front end, similar to how far the XXX-4s does. But this is an issue that alot of race vehicles have. I am going to see if a rigged up RPM B3 bumper will work.
The drivetrain felt like it held up good. I still have to get used to how offroad vehicles still smack down hard off of big jumps. I think my handling issues were do to me trying to setup too much for the big air and not enough for the overall track. Looking at how the other vehicles all bottomed out, I am not suprised the bottoms of chassis look like they do
Ok, now to the bad stuff. coming off of a jump I came down more so on the front wheel, ironically on the same side broke an arm on and the axle sheared clean off. I will get some pictures up but it sheared off right at the point of the bearing outer bearing. Not having any spares I was done for the night.
I think that this has been reported before here. I am not sure if it was due to previous damage from my crashes, but I have never had an axle on ANY of my vehicles do this before. So I think this is something I am going to call MRC about and report. If I get the chance I will post pics of what it looks like.
The good thing is that the LHS owner who runs a XXX-4 brushless quite well I might add likes the academy and will be carrying 4 kits and then 2 of EVERY PART for an initial run to see how it goes. He is a good guy without killer markup, and told me flat out that when he carries a kit, he supports it. So if this happens again, I shouldn't have a problem getting replacement parts.
So in summary, I think that the vehicle is a great contender, just a few teething issues that I think relate mainly to the axle. Picking up a spare set of these is a good idea. I would also pickup a set of extra spur gears as I am not sure where you can get a reasonable motor ratio with the little ones they include.
I plan to call MRC and see if they do carry a 72T spur gear that will fit and see if they can get it for me, may about 4 of them just in case as well as the axle I broke. I will also be changing up my settings to have softer suspension and I just need to get used to the sound of the chassis slapping down I guess like everyone else does
Just curious, can any explain what the benefits of using a 1 way in 4wd offroad is and what conditions it benefits to use it on?