Great buggy! Really enjoy running it.

What springs are you guys running?

Pink in front, and Red in Rear

This past weekend I lost 2 throttle/brake servos. The last one resulting in popping the connecting rod which took out the piston and sleeve as well. Has anyone else run into issues with throttle servos? I have a NB48 and the servos were Savox 2271's.

I believe it may be your brand of servos, I had some servos go out on me as well in the NB48 and they were Savox. I ended up going with a Hitec Brushless setup and I haven't had an issue since.

Funny, this past weekends race someone running a Mugen also had a Savox failure on their throttle servo too.

The 227x's are Savox's brushless line. To me, they seem a step up in terms of quality over the usual Savox servos you always hear people complaining about. I run 2274's in my NB48 (only car of mine left with Savox's, been trying other brands), same servos Ty Tessman uses... Never had a problem with mine.

I can only suggest the usual stuff. Check your end points, make sure nothings binding, etc. The 2271 is a very quick servo at 0.06sec. Maybe try a slightly torquier servo like the 2274, and trade off some servo speed, you really don't need, and won't be able to tell.

Thanks for the input. I haven't had time yet to check the car over. Will be doing that tonight. I have an 1270tg that I was going to put in for this weekends point race. It has a lot more torque but is much slower. Hope that it isn't to slow.

servp issues
 

are you noticing any rock in the radio tray itself. Losi have the same problem
untill I built a radio tray stiffener for them. Also the plastic servo horn could be flexing.
Does the brakes tend to fade in the longer mains?
I am coming out with an aluminum servo horn as soon as I get them back
from anodizing.

I did not notice any rocks.
I will keep an eye out when I tear it down.
Will the servo horn be an exact copy as far as geometry goes?

yes

They are good when new, but after a couple races, better change them... I moved from Radiopost to Savox, but moved on after a couple months... I used the 2272...

I checked over the linkage again and everything moves freely.
I removed the second servo and you could smell the magic electrical smoke and the bottom of the servo was melted and bubbled out.
It got very hot for some reason.

Can anyone confirm/decline that it's ok to put fiberglass brake discs (TKR5206) along with reversed std. NB48 brake pads (clean metal to disc, original pad material removed).
Or i'll ask from such point of view: does NB pads (TKR5314) are just steel pads (TKR5214) with material on it?

All, need some advice. Is there any benefit of purchasing a new NT48.3 kit as opposed to upgrading a NT48 to .3 specs?

Depends. How worn is your old kit, do you have someone you can sell it to, etc? The NT48.3 indeed has upgrades, but it's not as intensive as the NB/EB .2->.3

Personally, most of mine was in very good condition still, so I just upgraded the components and replaced worn parts. New brake system, hinge pin system are both HUGE benefits. Personally at absolute minimum I would do those.

In the end, price it out and see what makes the most sense for you, honestly.