What is wrong with my junk?

[wranglercheroke]

I have an ax10 and have put quite a bit o money in it. I started out with a 65t motor and recently installed the novak 55t motor and rooster speed control, and many other mods including the dna dig, the inner link mount skid plate, the losi 4" shocks, the proline sticky tires and should have my warthog tube chassis on wednesday. My problem is that my rig seems to not have enough torque it appears to be bound more easily than before my recent mods, almost as if my battery is dead! Please help me if u know my problem. I competed in Tucson a couple weeks ago and did very very bad I'm a great driver however my rig was not competitive (new mods since then). I am going to Cedar city this weekend to compete again and would like to do better. Any suggestions?

[2JSC]

Whats your gearing and what battery are you using?

[soundcolor]

According to Novaks website, the 55 crawler is designed to be run on a 4-7 cell pack (each cell carring 1.2v, so a 4 cell will have 4.8v and a 7 cell will have 8.4v) Or 2s LiPo cells. So I would first recommend putting the maximum amount of voltage to it regardless of NiMh, or LiPo. Second, If you arent running a low enough gear reduction then you wont be getting the torque you need. I dont know what your gear ration is, but I'd be running somewhere between 50-70:1 (I think max for the ax10 is around 74), Beings as you said you compete with it, I would recomend at least 60:1

If you have the specs on your battery, and the gearing I could be more helpfull

[rdtshaw]

Also, does this happen when you have the Dig engaged or the steering at full lock? Might be that you need a BEC to help the ESC cope with the servo load... Mine used to be fine in a stright line, but as soon as I got in a tight spot, swinging the tires back and forth, it would bomb out...

[wranglercheroke]

I dont know my gear ratio, however I believe it is stock, my battery is putting out 8.4 and I will get new gears thanks for your help. Much appreciated!! And what is a BEC? I know lil about R/C crawler and quite a bit about the real crawler. I have been gettin' mixed opinions on my link geometry. It is not like a real rig it performs way different, I'll post some pics and hope for some feedback. Thanks again.

[2500hdon37s]

what are the teeth on each gear or look in the axial manual

[robbio4422]

i think its the power being put into your rig. i would suggest a BEC

[rdtshaw]

Originally Posted by wranglercheroke

I dont know my gear ratio, however I believe it is stock, my battery is putting out 8.4 and I will get new gears thanks for your help. Much appreciated!! And what is a BEC? I know lil about R/C crawler and quite a bit about the real crawler. I have been gettin' mixed opinions on my link geometry. It is not like a real rig it performs way different, I'll post some pics and hope for some feedback. Thanks again.

A BEC is a battery elimination circuit. It was originally designed for RC planes that use 3S+ lipos or basically any battery that outputs higher voltage than servos can use. It regulates(lowers) the voltage to a set limit, i.e. 6v so that the servos can operate with out adding an additional dedicated receiver battery pack. In our application, we are using it to bypass the circuit built into most ESC's for powering the RX and servos. In standard bashers (fast cars), the servo doesn't work very hard. They are usually turning when moving and only a little at a time. The amperage (or power) provided by the ESC through the receiver is usually sufficient for the servos.

We crawlers on the other hand must be hated by the Hitec and JR warranty departments.. Crawlers beat the crap out of servos, grinding high traction tires into high traction rock! The esc's out on the market do not have the power output to support some of the 150+ in/lb servos that we use. Nor are they designed to... So what we do with the BEC is allow the ESC to simply provide power to the motor alone and use the BEC to offload the power directly to the servos. When you install the BEC (Which you can wire in 20 different ways) you will have the BEC provide power to the RX (The "Batt" port on your RX) and no longer get power from the ESC. Just do a search for "wiring a BEC" and you'll find tons of info about it. Here are a couple good links for BEC's.

Where to by one, Holmes Hobbies, $22
http://holmeshobbies.com/product.php...0&cat=0&page=1

Castle Creations webpage for their BEC, one of the best on the market...
http://www.castlecreations.com/products/cc_bec.html

The BEC upgrade is one of the best and cheapest mod you can do... good luck!

cheers,

Rob

[Da Hermit]

http://www.castlecreations.com/

This site will answer your BEC.
Also what battery are you running? Lipo 7.4, 11v. NMH 7.4V.


Higher voltage will always require a BEC.

RDTshaw has a faster clicker finger than me...

[rdtshaw]

Originally Posted by da hermit

rdtshaw has a faster clicker finger than me...

[wranglercheroke]

Thanks for the definition of the BEC I learn something new everyday. I Just went the the store and picked up 72T 48P spur gear and a 12T pinion. I trust yalls advice that this will do. I also picked a JR Z9100T servo do yall recommend a BEC? I am runnin a 7.2 battery custom made split 3x3 its a true 4500mah (so the battery guy tells me).

[wranglercheroke]

I just bought gears either I have no Fn' clue or they hosed me. With the smaller spur gear the pinion gear does NOT even come close to connecting with each other!

[soundcolor]

Umm, hmmmmmm.
The spur gear itself shouldnt be that much smaller that it won't contact the pinion...
Did you leave any parts out, or put it back together in the wrong order.
Are you sure the gears they sold you are made for your axial trans and axles?

As for the BEC. I would run one no matter what just for insurance.

[cutlaSS]

to get a numerically higher gear ratio you go smaller on the pinion and larger on the spur.

[rdtshaw]

the 74 that was posted was refering to gear ratio, not spur size... The minimum you can probably run on the AX10 tranny is a 84tooth spur. The stock 87/14 gears (tooth count) should be absolutely fine for the 55T motor. You might want to drop the pinion to a 12T to get a little more low speed control. I.e. keep the new pinion you installed in the rig and swap the stock spur back in. The JR servo you bought is absolutely going to need a BEC. It's going to have that ESC beggin for mercy.

Bottom line is that you're going to need a BEC with the direction you're taking that rig... Order one from Holmes hobbies and have him program it for 6V. Once you get it, search the forums for BEC wiring and you should be good to go. If the rig still has problems after that, then you might have a issue with the ESC. Were you running a different one before? I would swap it back in too just to see if there is a performance change.

[goodoldlevi]

Are the endpoints set on the dig? Before I got my dx3r my old tq3 had no endpoint adjustment and and when I first set up the dig it caused a lot of drag on the tranny. bec is a must.

[CJM]

i run 9tooth pinion, 93 tooth spur on my ax-10. no prob. with torque, wheel speed is a diff. issue, lol -- volt up!!!

[wranglercheroke]

Thanks Guys I appreciate it.

[69CrazyHorse]

You cannot volt up the rooster speed control. I believe it is maxed at 7.4. I would run the stock gearing with that combo or at the least drop a pinion size or two. I also believe the Rooster Crawler ESC has a HD 6v/5a BEC already installed. Have you fully calibrated your speed control?

The stock axial spur is 87 tooth. RPP Hobby has a 93 tooth available for $6.49 than match it with an 11 tooth spur and you will be running a 65.03 ratio or go with the 10 tooth and get to a 71.54 ratio.
http://www.shop.rpphobby.com/product...productId=1592
Page 4 of the axial owners manual will tell you all the ratio combinations.

IMO I think those ratios are a little to low I prefer to run my rig at more like a 40 ratio however I run a brushless system so it may be skewed a bit.

Good luck!

[freetimecrawler]

Sell the Rooster, pick up a Tekin FXR, put in a hand wound 35t-45t, a 3S Lipo, and add a Castle BEC. Problem solved