44t is the biggest i can put in a maxx truck. if i like bigger i have to work on the CD mount.

diff front and rear: 43/10
spur pinion: 44/13
5s
2200kv

SPEED 48 mph(77.5 km/h)


44/12= 44.5mph(71.5 km/h)
44/14= 52 mph(83.4 km/h)

Well, as a general/ rough guide for gearing things like the maxx, revo or flux with the MMM & 2200kv motor:

4s lipo = 40mph
5s lipo = 50mph
6s lipo = 60mph

Those are realistic top speeds for a truck in the 10lb region. As for actual speeds you should aim at, that kinda depends on the terrain and how much space you have. I use 5s lipo with the Medusa 36-80-2000kv motor, roughly equal in power to the MMM motor but a tiny bit slower; I gear for 40mph as thats plenty of speed for the space I have ( about a football field size area roughly ). 44/12 sounds fairly good for your setup, but you can always experiment a little bit up or down to see how you like the acceleration vs topspeed & see how the temps react; there isnt really a perfect setup or gear ratio, just whatevers right for you & what you're doing at the time.

Thanks. I really appreciate your help.

Ofna buggy or truggy diff? Is it any difference? I will change spur to 44t.

No difference inside, just different sized spur gears for truggy vs buggy use.

Thanks

Deleted.

Okey
i bought this one:http://iphone.ebay.com/Pages/ViewIte...20diff&emvcc=0
is it okey?

That'll be fine. :)

@ George- I think you realised we were talking about CDs rather than front/rear diffs, so I'll let you off :lol:

Is it this one i need for the front/rear diff?
http://iphone.ebay.com/Pages/ViewIte...20gear&emvcc=0

It is, but you will need the spiral cut ring gear to match it, cant mix & match straight cut + spiral cut gears in the diffs.

Aha offcurse. Thanks. Is it possible to find 10t bevel gear to fit My diffs?ehiout change the ring?

Hmm, possibly, but it will be smaller in size so wont mesh very well, if at all, with the ring gear. Just replacing the ring and pinion gears shouldnt be too expensive, but it may require a bit of looking around- tower hobbies and amain should have the parts- check under hotbodies and ofna parts.

Neil, you're right about that.

Rick, you can buy the 11T from the Hyper ST. They're straight cut gears.

@Neil. I found it at tower. Okey price
@George, have you used the 11t bevel?its nice if its work, just buy pinions

I bought a complete set of Hyper ST diffs before. They work just as good as the other 1/8 diffs. I have an assortment of Ofna diffs; Yper 7/8/8.5/9, Hyper ST, violator/mutilator etc.

Should i have any oil between the bevelpinion and diff?

Not oil, but a little bit of grease is a great idea; I like the tamiya ( white lithium ) grease, but anything fairly 'sticky' will work fine- like that 'gorillasnawt' you see on ebay etc, or automotive grease even. Just to lube the gears and keep them smooth really, doesnt have to be anything too special or too much.

can i use any kind of motor pinion that fits 5mm shafts?

will my diffs be broken if i dont have the grease?

Depends what you mean by 'any kind'. if you use a MOD1.0 spur gear, you need a MOD1.0 pinion gear ( same deal with 32pitch spurs and pinions ). If you mean materials though, then hardend steel pinions are the best, or hard-anodised aluminium ones. Mike sells arguably the best hardend steel pinions around, then there are also the RRP ( robinson racing ) pinions, Novak's pinions & a few other brands- hardend steel is the best to prevent a steel spur from eating the pinion within a few runs; standard aluminium ones like you find on ebay wont last very long at all.

Your diffs wont break if you dont use grease, but they will probably wear down a bit quicker and be noisy- any kind of grease can be used, so long as its a bit sticky and preferably symphetic. That tamiya grease is easy to find on ebay, as are automotive greases used in 1:1 car gargages- check out your local hardware store or shop that sells stuff for 1:1 cars.

Is it stupid to use a plastic spur? Mike have 44t kyosch spur, but it is plastic.

Plastic spurs are fine- some people would say plastic is better because its quieter, and you wont get worn-out gears so quickly. I prefer the idea of a metal pinion and plastic spur, for the reasons I just said- my emaxx and txt-1 do it that way and I've never stripped a spur unless the motor came loose.

So with a plastic spur a can use any steel pinion?
And if i use the ofna steel spur, how do i know what kind of steel pinion i can use?

With a plastic spur you can use pretty much any pinion material, though the harder the material the longer it will last ( I've seen aluminium pinions worn down by nylon spur gears quite baddly ).

If you use the ofna steel spurs, then a hardend steel pinion is the best choice- one of Mike's or a RobinsonRacing being the most popular ones Im familar with.

Thanks

I dont think the kyosho spur will fit my ofna spider diff.
The spider spur have 6 screws and standard have 4. Look:http://www.amainhobbies.com/product_...-46T-Spur-Gear

it should work if i mod. my FLM chassi and use a bygger pinion

i think i will start like this..


Differential Ratio: 4.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 10
Total Voltage: 18.5
Motor KV: 2200
Tire Diameter (inches): 5.84
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0.006
Spur/Pinion Ratio: 4.6 : 1
Total Ratio: 19.78 : 1
Tire Circumference (inches): 18.35 inches (466.01 mm)
Rollout: 0.93:1
Total Motor Speed: 40700 RPM
Vehicle Speed: 35.75 mph (57.43 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

To be honest, that seems a bit slow for that kind of motor and 4S?
Do you want to gear it for that speed?
My main concern would be the motor, it could be under to little load and might get hot.

5s...
Please help me. I can use a bygger motorpinion. i would like the truck to be fast, strong and not hot... if k kan run 75, please help me with suggestion.

Right, 5S, got that wrong.
But there is not much to help: Use a bigger pinion/smaller spur gear if you want to go faster.
I geared my g-maxx for 75-80 kph and it runs fine.
But easiest way is to just gear it for your wanted speed (75 what? kph? mph? huge difference!) and monitor the temperature of motor, esc and batteries. I think everyone who bilds a truck like your's or mine should have a infrared thermometer.
Building a truck for severel hundred dollars, motor/esc combo for another 200-300$ but but saveing on a thermometer that you can get for 10-30$ allways seems a bit strange to me.
Because it's one of the easiest ways to check if everything runs cool and healthy.

I have i tem. But i have to know aprox how fast i can gear the truck and what gearing the motor/ecs/batteries can run.
The speed is not so importent, when everyting runs great Iam happy.and i talk about kph. I havent find any smaller spur and bigger will not fit, so i will use a bigger pinion.
So it just buy pinion 9-15 and try?

My mistake...
Neil helped me but i mixed kpm and mph..
4s lipo = 40mph
5s lipo = 50mph
6s lipo = 60mph

i will calculate "whit Brian" and be back...

I have start to build up another maxx for my kids. I will use stockdiffs and wonder what bulkheads is best?
Should i start a new thread for that truck?

GA bulkheads are great.

GA??Can i out the stock diff in it?

Great Assembly.

Sure you can.

Nice. Thanks, where can i find it? Not at ebay..
Find there website, is the 6061alu okey?
Is it possible to put the stock diff from 3908 in this:http://www.rc-monster.com/proddetail...LM17001&cat=47

Yes, the diffs in the newer ( grey chassis ) emaxxes are all the same, they will fit any standard maxx design bulkheads. The FLM ones are what I use on my Gmaxx- very nice quality.

Than i can put it both in the bulkheads and the combobulkheads?Is that right, that FLM has two options for stockdiffs?

Yes, they sell normal bulks and combo bulks for 3905 & 3906 diff gears; I must say though- dont waste your time or money with the combo bulks. Buy either the standard bulks and some complete 3905 diffs from ebay, or buy the Hybrid bulks & some 1/8 ofna/ hotbodies diffs from ebay or Mike. The combos do fix the problem of diff-case flexing, but they dont fix the weaker spider gears or generally poor mesh of the ring & pinion gears ( the teeth dont match up all that well, even when properly meshed ).