7.7s installed, what about gearing?

[BasherX]

Well I got he GS Racing 14mm-17mm adapters in today. They worked like a charm. I installed the Hot Bodies 7.7 choppers. Man they look sweet with my Hummer body. I'll post up some pics later tonight for ya.
Till my BL system gets here, what gearing should I be running with the titans and the trinity mild max motors? I bought a Robinson assortment pack. I hope I got the right range.

TIA

BasherX

[madmouse]

razer just put this a a diff. post.
new tire diameter/old tire diameter x old gear ratio = new gear ratio

[BasherX]

Posted like I said I would

[BasherX]

Originally posted by madmouse
razer just put this a a diff. post.
new tire diameter/old tire diameter x old gear ratio = new gear ratio

That would be great.. hmm lets see, oh yeah I asked because the only thing I do know is the new tire size of 7.7. Thanks though.

[luis gloria]

wow those are a statement,have you ran that yet what are you geard at

[madmouse]

well 1st off the old tire size is 5.75 and to get your gear ratio count the number of teeth on your pin. and spur then you will know what your old gear ratio is

[BasherX]

Its at the stock gearing as far as I know. I am 100% sure it needs regeared, hence the reason for the post. I picked up an spare ESC and RX after putting my gmaxx in a pond the other day. I havent driven it since installing the wheels.

They do look sweet though!

[BasherX]

Ok I just counted.

66 spur
17 pinion
old wheels 5.75

tire ratio = 18.064
spur/pinion = 3.882
trans ratio is 24:1
gearing quotient = 9.318
tire to gear ratio = 8.7318


66 spur
17pinion
7.7 wheels

tire ratio = 24.19
spur/pinion = 3.882
trans ratio = 24:1
gearing quotient = 9.318
tire to gear ratio = 14.873


Thats a difference of 6.142

So what pinion/ spur combo would work well with the titans and the wild max?

[razer]

Originally posted by BasherX
Thats a difference of 6.142

So what pinion/ spur combo would work well with the titans and the wild max?

Don't make it so complicated! Stock spur/pinion ratio is 66/18 (3.67). Use that for the equation: (7/5.75)3.67=4.47

66/15=4.40
72/16=4.50

Those are probably as close as you're going to get to 4.47.

That's for the Titans. I don't know what ratio would be good for the WildMaxx motors, so you'll have to figure that one out yourself.

[i_am_who_i_is]

Oooooooh Me Like Shiney!

I run a 72 tooth spur, and 18 tooth pinion (stock). I have ran them with stock size, jumbo kongs, and now i have LSTs. I think this gearing might be good for you.

[bashin Maxxer15]

How fast do u get on that setup?

[sudc321]

thats gotta be crazy, can the stock drive train handle the extra weight of the tires its rotating? i'm afraid of putting on some 40 series dirthawgs or big joes with the 23mm hex adapters. i love the look maybe one of these days i'll get some monster tires.

[CrisisAngel]

Originally posted by sudc321
thats gotta be crazy, can the stock drive train handle the extra weight of the tires its rotating? i'm afraid of putting on some 40 series dirthawgs or big joes with the 23mm hex adapters. i love the look maybe one of these days i'll get some monster tires.

dirthawgs will be fine for your application, other than the diameter, they would be about the same rotating mass as stock, maybe even less...

Big Joes are WAY heavy because they are extra wide...dirthawgs or mashers are the way to go...

[BasherX]

Thanks for the input. I am going to pick up a 72 spur and get a few pinions from 12-16.

I think 66/13 and 72/15 may be the way I go.

[Bjorn]

I have several e-maxxs, including one for my young son (3 when he got it, 5 now).
I wanted to gear his truck WAY down so it would be easier to control. I also decided to throw some 8" Jumbo Kong tires on there. These are the largest e-maxx tire. They are very tall and wide. I figured they would stabilize his truck and the tires and help soak up the bumps and collisions. So I geared his truck 11/72, which was the most extreme gearing I could find locally. This kept his motors from every burning out, while the rest of us went through titans regularly. But, because the roll-out of the tires was nearly 40% longer he didn't really get any slower. Turns out he was the best driver of the bunch, almost never crashes.. so my fears were in vain.
Moral of this story: gearing down might not cost you any real speed, and doing so really reduces the strain on the truck.
When I geared my main (heavy) truck down a bit to play around with 14 cells. I found it was best at 16/70 or 72... my other truck was alot lighter and ran great at 17/66.
as always your mileage may vary.

[mwsmith2]

I got the hotbodies 7.7 choppers on my Emaxx too. Yup, you need new gearing. Slapping those big meats on there turned my spry Emaxx into a pig. Stock gearing is 18/66, and when coupled with the stock tires yeilds a final ratio of approx -10 in 1st and 0 in 2nd. The closest I found was to use a 14/66, which gives you a -12 in 1st and a 1.1 in 2nd. It's a simple pinion swap, and mesh adjustment. This will give you even more torque (!) in 1st, and slightly higher top speed, but acceleration in 2nd won't be quite as fast as stock. It's still easily within the allowable ratios as suggested for the Titan motors.

Do NOT run 7.7's in 2nd with the stock gearing! The final ratio is 6+ and will smoke motors & ESC's. I think the highest ratio that traxxas reccomends for the Titans is 1.2 or something like that.

Running a 13/66 will give you yet more torque and snappy acceleration in 2nd, but at the cost of top speed. I'm real happy with the 14t, I can't imagine what a 13t would be like -- it flips wheelies WAY to easy as it is!

Michael

[mwsmith2]

Originally posted by sudc321
thats gotta be crazy, can the stock drive train handle the extra weight of the tires its rotating? i'm afraid of putting on some 40 series dirthawgs or big joes with the 23mm hex adapters. i love the look maybe one of these days i'll get some monster tires.

Nope!

http://tinypic.com/i6hz13.jpg

(please excuse the cruddy phone cam pic)

That's my rear center driveshaft. However, I guess I'd rather have that fail than my tranny. Got some CVDs on order now. :P

Michael

[Bjorn]

Whether the stock sliders handle the weight has alot to do with how you drive. My son's truck as jumbo kongs, (the largest and heaviest tire for the E-Maxx), and has yet to twist an driveline.
I typically drove lighter then stock tires and twisted as many as 5 drive lines in a single day (racing on the beach).

[BasherX]

We took the Gorilla and rusty to the skateboard park last night. Wow that was alot of fun... the gorilla handled it like a dream.
Broken parts:
NONE
well I did crack my bashing body....(red 'burbin')
Oh and a bent body clip!

The 13t Kobal rusty.... well it didnt like getting 18-20 ft in the air during top speed launches!!!
Broken parts:
Front bulkhead
Front bearing carrier
2055 servo and servo saver!
Front end links
All front pins bent

My Evader Pro shattered! My goal is to get every part replaced during its 1 year warranty period. Maybe that will get Duratrax to build better parts!
Broken parts:
2 Rear toe blocks
Bent CVD
Shock rod end
both rear graphite a arms
ESC
2055 steering servo


here is the rusty with owner Kyle


My gorilla stored and me playing on the 'net!

[CrisisAngel]

the rustler outbashed the evader, no suprise there. Traxxas is just bout the gold line when it comes to durability (in terms of stock).

Keep bashing, good thing your e-maxx will never let you down that think will bash for a LONG time before something breaks, and you can probably still bash with teh broken part.

i did a track day and snapped my lowe a-arm on 1 of the mount points to the hingepins, but still drove for another 3 hours on it without it breaking.

then, i hit a pole the day before my trackday, yet i still drove (and am still driving ) with stripped bumper mounts, broken front bulkheads, mangled bulkhead brace and bent bulkhead brace screws.

(i have aluminum bulks waiting to be installed, i just need my titanium hingepins to come.

[BasherX]

LOL we did keep bashing! I zip tied the front wheels straight (or kinda straight) and we just lined the rusty up to the jumps. That thing is a tank.

[CrisisAngel]

Originally posted by BasherX
LOL we did keep bashing! I zip tied the front wheels straight (or kinda straight) and we just lined the rusty up to the jumps. That thing is a tank.

all traxxas cars are tanks...ive seen hundreds of jumps where traxxas cars (mostly t-Maxx's, i think its STILL the best selling truck, even more so than the revo) anyways, there was this giant jump and people were launching their trucks off it. Then some savage guy tries, goes home with broken a-arms, blown out shocks and bent chassis after like 2 jumps LOL

Traxxas durability...

Ps. Check my sig (toward the end - its in all caps)