symmetricon

iTrader: (27)

I got my XB4 right at the min weight limit and while it does seem to change directions faster it is harder to drive. I'm going back to a full size shorty to add weight back.

Cain

iTrader: (294)

so how has the state of 13.5T racing been for you guys?

At a track here that is full mod, its common for drivers to run 13.5T motors due to its size.

Davidka

iTrader: (86)

Alexv2024

iTrader: (2)

I just switched to a B64 from a 22-4 2.0 (and 22 4.0 to b6.1 to match) and I'm loving it. Picked it up cheap from a friend with the MIP puck system. Weight is 1700g with a full size 5500 pack and shorty steering servo. I need to get a new raw speed night hawk body and paint it up to loose some body weight.

Other then that I picked up quite a bit of speed per lap something around bare minimum .5 sec per lap to a full second per lap. Im now competitive at top of the amain even when faster guys are showing up at our normal club races.

This is all 13.5. I did run a 7.5 for a few packs and I'm just beginning to be able to use the extra power. I'll stick to 13.5 for a while longer, I still have plenty of room to improve while I really learn the car. Loving it so far.

Cain

iTrader: (294)

yeah here we ran full mod last year outdoors on a turf track, 100 x 80 or so. Even there guys were saying how they felt better using less for motor other than the straight. And I could be wrong which is fine,but part of me feels the full on mod levels of power may have scared off folks into trying the class versus the very active 2wd 17.5T spec buggy class.

We also see some nice turn out to the 13.5T stadium truck class that go going on another track, though they do allow open timing on escs but in general running it spec works just as well for the size.

Heck makes me wonder at times for our larger outdoor track if just going with 13.5T motors all around could give the speed boost some guys could want in 2wd buggy but still be approachable for our area for others and keep everyone all together as a group. Anyway just ramblin

Glad to see guys are having some good wheeler turn out.

Anyone got gearing tips for a Tekin 13.5 Spec-R was thinking a higher FDR than I am used to at say 8.5 as a starting point.

trf211

With the Spec R I've settled on 9:1 FDR with ~50° timing.

I've seen several fast stock guys try mod and quickly go back. In my opinion the low end rip on the standard 12.5 rotors can make them hard to drive for someone interested in racing mod. With a weaker 13.5/17.5t motor and bigger gears, the torque at the wheels is lower so it is much easier to gauge when you're getting close to the tires limit and stay there. When they throw in a mod motor the tires have more torque and rpm to deal with. So the time between reaching the tires limit and passing it happens much more abruptly. Looking at the pro setups they will use the weaker 12.0-12.3 rotors to lower the torque and make them easier to drive at the limit but still have the rpm mod is know for. This is mainly for 2wd. 4wd doesn't seem to have as big of an issue with this due to the additional weight, drivetrain, and traction.

Mod at our track is dwindling but 13.5 is going strong. They have combined the classes to let the few mod guys still race. Times were relatively close on the last layout but our current layout is more motor dependent so they have a big advantage right now.

Cain

iTrader: (294)

Thanks for the tip on the Spec-R! What size track do you run on? will be a small tight track here. Till outdoor time

Looks like Maclan came out with "smooth" or whatever they call it mod motors, I wonder specifically for what you described.

Davidka

iTrader: (86)

Based on the marketing info, it sounds like "smooth" = a 12.2mm rotor, where 12.3mm is more common for modified & 12.5mm for stock. I recently learned that "whole winds" (7.0 instead of 7.5, etc) are a different winding pattern that is also smoother with less torque on bottom, but with higher rev ceiling, so faster on long straights.

Zerodefect

Best guess for starting gears for an Xb4 13.5?

Kelseyrc

iTrader: (7)

I run 78/26 on my XB4. This is with the Reedy S Plus, if you have a non high rpm motor you can go up a couple of teeth on you pinion

Zerodefect

Thanks.

yotasan

iTrader: (14)

To the OP I would suggest a EB410 or a Yz4 SF. OR whichever 4wd is driven most at your track. Without local support, you're not going to have much of a good time.

smkd13

Cain

iTrader: (294)

yeah personally wheeler is my favorite class. So whatever can help with growth love to see it done

4wdfull

Ive seen FDRs on this forum from 7.0 to 9.0. Can anyone narrow it down for a medium size Astro track along with timing for a blinky trinity monster 13.5?