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  1. #1
    RC poster
    Join Date
    Mar 2019
    Location
    Compton, California
    Posts
    1

    Rally monster conversion

    So I was at my LHS buying a rc truck for my son, and i saw a fiesta rally 4x4 and i decided to get back into the rc world 🤦🏽*♂️ Lol. I havenít taken my rc cars out of storage since i got out of the marines in 2011. So now that i showed my son my old collection, heís been bugging me about fixing them up. So here i am now lol back in and Iíve decided that Iím really gonna do my research this time and get my cars running right and i just want them to be durable and fast enough to handle almost anything thrown at it. The rally car started as the stock rally and i took It out to a dirt/concrete area with loose dirt on it. It performed well and as expected took drift corners and hitting ruts (it had rained a couple days ago and the run off had made some ruts in the dirt area) quite well, but when i took it to a grassy area it just wasnít as fun(yes i know itís not meant for that, but i did it anyway) so i started reading more into the design of it and found out it was like a slash 4x4 with a LCG chassis. And all i want is an overall good basher with some good speed behind it. So now my stock rally has quickly been upgraded to an old velineon vxl-3s i had laying around with a 12t pinion and a 54t spur, threw on some old proline shocks i had in the storage on it. upgraded the slipper clutch to the slash 4x4 one, with the steal pads. Iíve also got some aluminum shock towers and drive shaft. Was working great with all this but it still lacked in the grassy area, but i think Iíve finally found the solution...proline trenchers 2.8 have given me the clearance i want and still handles great on road when Iím just at home bashing in the front yard. Now on to the reason Iím posting...question #1 would the 2.8 ruin anything on it because of the size difference? Q#2 what else would you guys recommend i upgrade to keep it as durable as possible in the drive terrain as possible. I rather have broken parts because of a driver, or pushing the limits of the car/truck now instead of because of a bad mechanic lol ohh and Iím running a 2s 5200 50c battery and hitting 30mph on the street (per my garmin 301)...next on the table will be an old slash 2wd and a rustler 2wd, after that the summit 1/16 vxl and my sons LaTrax dessert runner (once he gets more practice on the sticks). Look forward to any feed back from you guys and any questions anyone has about my build feel free to ask( Iím not a pro but i find my way around) by the way i got the inspiration for my build from the monster slashs Iíve been seeing on YouTube

  2. #2
    RC Competitor
    Join Date
    Jan 2019
    Posts
    94
    I have pretty much the same setup on a 4x4 slash with no issues.

  3. #3
    RC Champion zedorda's Avatar
    Join Date
    Sep 2015
    Location
    S.E. Michigan
    Posts
    1,028
    The "old Velineon" is it old enough to be the 2-pole version? Check the plastic cover on the motor for the model number 3351R is the new 4-pole motor or check the ESC for a row of 3 capacitor cans up front. The 2.8 wheels will change the final drive ratio and you can fix that by reducing the pinion. It may not be needed unless it is real hot outside just make sure you have a temp sensor so you can check temps of the ESC(140F) and the motor(160F). With 2.8 wheels some people start to break the stock CVD axle shafts. If you don't plan to go extreme with the power like installing a 1/8th scale motor then getting a set of Traxxas steel CVDs will serve you just fine. They are drop in replacements with little to no maintenance required. If you think you might go to extreme levels of power and stuff the biggest motor possible in, then I would suggest some MIP X-Duty axles. They are about the strongest solution possible but require some maintenance and are the heavier option. Another consideration to keep in mind are the differentials. You should at the least take them apart and properly fill them with a diff fluid of your choice. I am not sure if they still do this but they used to only put grease in the front diffs. Now you don't need a full aluminum diif cup upgrade but an easy upgrade is with the XO-1 HD diff parts. It has side plates and an I bar in the middle for support. This upgrade can wait till breakage that is why I say just keep it in mind and maybe get the parts before you need them so you are ready.

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