BL Setup for Stock E-Maxx and Upgraded Parts Suggestions

[MountainMax]

Hi. I'm new to the forum. I've decided to go brushless. I mainly putts around parking lots and go flying around in the dirt looking for the big air. Occassional racing against the LHS employees dictate that I have some good speed too. I won't be upgrading suspension, chassis, etc unless I break something. The HV Maxx would be a decent choice for me but after reading a bit on this forum it sound like I could do better. I keep reading good things about the 9L/9920 combo so that is the direction I am leaning toward. I have some 6 cell batteries but they will get handed down to the kid once I get the IB3800 7-cell units. I like long run times. Specifically, my questions are:

Is the 9L/9920 the right setup for me? If a different setup is better, Why?
What kind of run times would I be looking at?
What upgraded drivetrain parts (like CVDs, steel gears, diferentials) do I need to get?
Would the stock gearing be sufficient? If not, what would be optimal?
Anything I overlooked asking about?

Thanks guys

[Papa]

Before you add too much speed, I would suggest you try for better control of the stock Maxx ,by upgrading the servo saver and the steering servo. Big power will not be fun without good control. The differnce in steering response and handling may surprise you. Check out the UE servo saver and a quality metal geared servo. look for high torque and speed.


Oh yeah...welcome to the forums.

[Gustav]

Welcome MountainMax!

The 9920/9l is a good choice but a favourite setup here is also the 9920/7xl on 14 cells.It has a good deal more torque and the ability to run nicely on 12-18 cells.

Either set up will require some drivetrain upgrades.(both very powerful).You can wait till things break and upgrade but what i would suggest is steel idler gears,cvds,a strobe slipper and maybe a gorilla max single speed conversion.Then i'd run the stock diffs until they need replacing.

The strobe slipper is good because it can actually be used as a slipper (with slip) without overheating.they use the ofna 51T spur.the stock slipper has a tendency to overheat and melt the spur gear unless you run it locked down with extra pegs.

the single speed along with a steel idler gear makes the tranny very bullet proof.it's stronger than the 2 speed by taking the backlash out,more +ve engagement.you really don't need 1st gear with a brushless setup.
If you keep it 2 speed get a pair of steel idlers from Mike($15 each or $25 pair) as the stock idlers won't last long at all.

RC-Monster Mike stocks all these parts but can get just about anything RC related for you,just ask him.
He's very helpful and offers a very high level of support.

Gearing will depend on which motor and cell count you decide on.If you go for the strobe the ofna spurs are mod1 pitch but Mike sells mod 1 steel pinions in 5mm or 1/8th bore.

[crazyjr]

You may need an external battery pack or a UBEC on that controler. welcome and have fun.

[coolhandcountry]

If you go brushless either the 9l or the 7xl(gets my vote). You will need the steel idlers and cvds. Papa has a good point. Control is a lot. I did not believe the difference it made when i changed. The ue saver is worth the money to me. You can find the proline servo saver on ebay sometimes. Not as good but good for money. I not sure how stock your truck is. I hope this helps you out.
WELCOME TO RC-MONSTER FORUM.

[Dafni]

You could also get the Kimbrough Saver here from Mike, along with a nice Bluebird servo.

I agree with the other guys. Gustavs post is nice and complete.

Welcome to the forum!

I have a jiffy question about what seems to be the prefered setup, meaning the 9920 and a 7xl, this is the same setup that was suggested for my truck, my truck is definately heavier than stock (UE chassis, GA bulks, UE wide track suspension, UE SS) Monster Mike was the one who suggested this setup for my 11lb truck......what I'm wondering here is if this is the right setup for my truck (I'm betting it is, cause Mike sugggested it....) then would it be over kill for a stocker like the one in this thread.

To my way of thinking (I am by no means an expert, that's why I come to this fourm for help!) If that setup is good for my truck, it would be over kill for a stocker, or if it's the right setup for a stocker, it's going to be under powered for my truck.

thanks all!!

[coolhandcountry]

The 7xl with 9920 is a very versatile motor. It will take form 12-18cells. If you truck is lighter you can gear it up get more speed out it. Truck is a little heavier put a little bigger ratio less speed. I ran the 7xl on a emaxx at 14 lb. Had no problems. Even had it geared a little high. It just went. Got a little warm though. It is a excellent motor. How many cells makes a difference to. More cells the more power. More volts = more rpm = more speed. Hope this helps.

[Serum]

On the long run, a proper set of diffs and dito CVD's are worth the invenstment as well..

The most wise thing to do is to drive it till you break it.

I too would change the radio/servo/saver part.

My choice would be the 7XL as well.

Proper batteries are also needed for BL, because the motor isn't any stronger than the energy the batteries can produce!

Originally posted by clisbyt

...

To my way of thinking (I am by no means an expert, that's why I come to this fourm for help!) If that setup is good for my truck, it would be over kill for a stocker, or if it's the right setup for a stocker, it's going to be under powered for my truck.

thanks all!!

You have correctly applied basic logic. :-)

With the variety of factors that effect performance a single motor may have more than a single application. I wouldn't recommend the 7XL in every application (like say a 20+ pound truck), but it is viable for a 12 pounder w/ the proper gearing, batteries, and speed control.

There may be a better motor that will put you in the "sweet spot" based on what you wanna do w/ your truck (race, bash, rock crawl, high runtime, high speed, etc.), depends on many factors. After all, you don't see 7XL's as the recommended motor for 1/10 two wheel drive trucks. W/ the weight of the 1/10 trucks the 7XL has too much torque, which would mostly be wasted in this application (unless you need said truck to go very slowly up a 45 degree bank towing a brick).

Will the 7XL and 9920 be perfect for what you wanna do? Dunno (not sure what you want to do w/ your truck), but it'll probably work just fine.


Hope I didn't muddy the waters. :D

[MountainMax]

Thanks for the input everyone. Good stuff. One thing I didn't mention is a trick I learned from modifying my truck/Jeep/ATV/snowmobiles is to figure out where you want your machine when its finished and build to that point. It a lot cheaper, for me, in the long run because I'm not constantly doing minor upgrades and pitching used stuff in the trash. Using my sometimes irrational logic, I would probably want to do a majority of the upgrades upfront. Downtime with broken parts kills me.
After exhaustive reading I'm also considering an Evo. Realistically, how far is RC-Mike from releasing a product for the average DIYer to bolt something together with a Revo chassis?
I'm sure proposing a Revo roller sale to the LHS will just produce a few blank stares, but maybe I can bolt the spare parts to a rollerblade or something (just kidding! Please, no replies on the problems associated with that idea).

Thanks again everyone for your input.

[Gustav]

Not long now!http://www.rc-monster.com/forum/show...5&pagenumber=1
Mike says here he's also planning on planning to sell Revo front rear end assemblies so no need for Nitro powered roller blades!

I'd like to know if two brushless motors are better than one, or would it be a waste of money?:P:

I want the 4-battery chassis, two brushless motors/ESCs, and 4 3700mAh batteries (No lipos for me), but does that sound ridiculous?:o

I put a good deal of aluminum on my E-Maxx, and I have lost speed and CONSIDERABLE run-time. It breaks my heart. :M:

[Dafni]

I would take one big motor over two motors every day!

[coolhandcountry]

welcom aboard icecream. I think the single big motor will out perform and run longer than two smaller motors. I run one motor. It is cheaper to run the one motor than two.