So I wan to run 7.5 inch tall tires. how to get a few runs before driveline grenades?

[needapeed]

I am wanting to run my new ERBE (new to me...bought a roller and have not figured out the BL setup yet). I plan to make this my full on offroading truck. I wanted to stick with the revo (as opposed to the summit) to keep things a bit more simple but I may install the 2 speed tranny gears so I can really cut the final drive down (or increase, rather) for the tall tires.

I am buying everything used as this will be a beater truck. If I can find an RX8 and either a 1900kv or 1700KV sensored tekin motor with it to help get everything moving (and the sensored aspect will help smooth the low speed stuff out).

When running these tires I only plan to run 4s and since I will be climbing a lot there will not be a whole lot of shenanigans (trying to do dead wheelies and etc).

What setup will help me get the most run time out of the truck without constantly breaking driveline parts? Should I throw in spools to prevent diff failure? Although I remember long ago we used to snap the output ends off the spools in the BL emaxx's.

Will summit shafts hold up to the torque and mass of the tires? Or will cvds be needed (if so, who makes the best cvd's? Can they be used with LT rockers without binding?)

I am sure this will be a short lived event as I am not a huge fan of spending more time wrenching more than I run.

Thanks in advance for any help!

PS these tires are 7.5 tall and either 2.5 or 3 inches wide (so while they are tall they are pretty narrow so hopefully helps keep the unsprung weight down a bit). To compare: the stock gemini's are 6 tall and 3.4 wide. Summit stock tires are 7.1 tall and 3.8 wide.
So...anyone running tall tires...what are you driveline mods if any????

[Foxprogt]

iv been running tall tires for awhile for my offroad build. iv been using the stock 2200kv brushless motor on 6s and timing set to lowest. i have considered using a lower kv motor for this truck but so far this motors been fine.

iv been using the traxxas cvd kit and so far it has not been giving me problems when i use the standard wheel base rpm a-arms.. i do have problems when i use the traxxas extened wheels base arms. the cvds would pop out of the cups all the time, but as i said with the other arms, they have not popped out once. i do use LT rockers as well.

id recommend the cvds if you dont plan on using the extened wheel base a-arms tho some others may still differ.

i have not used summit shafts so cant comment on them.

there are other makers of cvds or mip that you could look into too .. i have not tried this set and cant say if its good but im just posting it as an example.
http://miponline.com/store/mip08135.html

[needapeed]

Thanks for the info!

What tires are you running? I have seen a few people with the jumbo HPI knobbies, some moab 40's and moab XL's and etc which are all right in the same dimensions as what I want to run (those are in the 7 inch range but are 3.5-4 wide where as the ones I want to run are 7.5 but 2.5-3 wide). So essentially the rotating mass should be about the same (maybe even less for the tires I have in mind)

What do you gear yours for 6s? I was planning on getting 2 2s and 2 3s to run 4s for offroad/climbing and 6s for everything else (onroad/high speed park bashing). I have read the 2200 is a pretty stout motor so if your not having problems with it I may just save the cash and run the MMM/2200 instead of forking over the extra cash for the rx8 combo.

[Foxprogt]

im running 18/54 gearing but my motor timing is set to its lowest. im using hpis terra pins which have been great so far.... would be even greater if they were taped. X)

[noir522]

if you have the extended rear arms traxxas sells the extended drive cups as well, part number #533R. they are longer and should stop the popping cvds. Foxprod what version of the castle software do you have installed? my next project is a mmm crawler but I still get a lot of cogging.

[Foxprogt]

if you have the extended rear arms traxxas sells the extended drive cups as well, part number #533R. they are longer and should stop the popping cvds. Foxprod what version of the castle software do you have installed? my next project is a mmm crawler but I still get a lot of cogging.

yeah i have the extended drive cups and they still popped out. as for my mmm software... ill check and get back to ya.

[Foxprogt]

according to my castle link... im using v1.24 beta ....... which is odd because i dont remember updating the software that recently.

[FreakyT333]

The 1.20 firmware seems to be the best for crawling, I experienced a lot less cogging but went back to the 1.24 because I like my lvc set a little higher (3.4) and the 1.20 does not have that feature...

[sfr4x4]

+1
1.20 gives you far better control over your car's movement at low speed.
I use a pair of small 3.3v/cell LVAs in addition the the fixed LVC cutoff so I know when the batts start to dip too low.

To the OP,
Check through the Summit forum, there's many guys running tires as big as 8.5" on theirs. Being the two cars are so similar, most of the upgrades used on Summits can be applied to an E-Revo as well (though I do believe the E-Revo has more metal differential parts available such as al. housings and cups/carriers, so you might also consider some of those parts as well).