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  1. #1
    RC Enthusiast
    Join Date
    Jan 2013
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    27

    MERV suspension gold - thanks to varunaX!

    If you haven't read varunaX's "how-to" suspension setup, you need to do yourself a favour and check it out here: http://traxxas.com/forums/showthread...ips-and-tricks

    Backstory: I bought the brushed MERV, and then upgraded it to brushless with the vxl3m and 380 Velineon motor. After upgrading, I could barely turn on pavement without sending my MERV cartwheeling far and away, and this was with nihm batteries! Even at moderate speeds, the MERV would three-wheel through corners.

    Fast forward: I followed varunaX's guide to order about $7 worth of stuff off flea-bay. Using the stock shock bodies and pistons, I replaced the stock "oil" with 80wt Losi silicon shock oil. I pulled the black springs from the back and put them on the front. I then put blue summit springs on the back. I then adjusted all four corners so that the driveshafts were just above horizontal after recovery.

    Wow, what a difference.

    I just got back in from my first runs after upgrading the springs + shock oil. It was very cold out (about -10 C), but dry. All runs were on pavement.

    It was impossible to flip or cartwheel the MERV.

    I can't believe that $7 worth of springs and shock oil can make a world of difference. I could plow my MERV into turns at full throttle, and it would just stay flat. In the past the MERV would lift the inner rear tire like a dog taking a pee at even moderate speeds. Not anymore - it feels like I'm driving a totally different truck. I can only imagine what it would be like doing the rest of the recommended mods like putting in rocker bearings and better shock bodies & pistons.

    If anyone is having trouble keeping their MERV shiny-side-up like I was, I really think its worth a couple of bucks an and hour of your time to try out this mod.

    Here are a couple of closeups of the shocks and pre-tensions.
    Black MERV springs up front:


    Blue Summit springs in back:

  2. #2
    RC Competitor
    Join Date
    Mar 2013
    Posts
    58
    whenever i do a turn at high speeds the car usually flips although it depends on how i throttle too

    but it occasionally does the pee thing u mentioned so sounds pretty great

  3. #3
    RC Racer
    Join Date
    Dec 2012
    Location
    Paved Paradise Florida
    Posts
    124
    reviving an old thread ... but in this case I dont mind.

    I love suspension tuning. thing about this truck is that it can do a lot of things fairly well. it can bash on or off road, it can jump, and it can race around a track - to an extent. right now I have my truck setup for a decent compromise between pavement and track, only changing tires and 3s to 2s in the process. swapping shocks takes a bit longer than I would like but would ultimately be the next best thing to change. right now I'm on blues/80w front, purples/100w rear.

    basically an on road setup means more spring than tire. in other words a very stiff spring that will make the tires skid before it wants to lift the inner rear wheel.
    MERV - 3S 23/50
    Revo 3.3 - stock

  4. #4
    RC Qualifier
    Join Date
    Jan 2011
    Posts
    899
    thanks for the shout out buddy. i too am still pretty pretty much using the same setup as you described. save up for those GTR traxxas shocks as well. over a year and i havnt needed to touch them, zero leakage.

  5. #5
    RC Competitor
    Join Date
    Apr 2013
    Posts
    57
    Just screenshotted this post and I am going to try it! I drive my revo on pavement a lot and it loves to cartwheel and tumble when I take sharp turns! Thanks for the tips!

  6. #6
    RC Enthusiast
    Join Date
    Apr 2013
    Location
    Wirral, England
    Posts
    24
    I'm definitely going to do this. I am just about to place my order for the springs and oil but could you provide more info on the following please?
    I then adjusted all four corners so that the driveshafts were just above horizontal after recovery.

  7. #7
    RC Enthusiast
    Join Date
    Jan 2013
    Posts
    27
    Quote Originally Posted by paulwiggie View Post
    I'm definitely going to do this. I am just about to place my order for the springs and oil but could you provide more info on the following please?
    I then adjusted all four corners so that the driveshafts were just above horizontal after recovery.
    Sure: I test the shock setup by pushing down on the chassis - bottoming it out - and then letting it rebound on its own. I then look at the driveshafts. Each drive shaft should be slightly higher at the chassis, and slightly lower at the wheel. If this is not the case, I adjust that shocks adjustment ring and retest: push down on the chassis and let it rebound. Repeat until its right.

  8. #8
    RC Enthusiast
    Join Date
    Apr 2013
    Location
    Wirral, England
    Posts
    24
    Ahh... Thanks very much. Gonna do this at the weekend. Ordered my bits the other day.

  9. #9
    RC Enthusiast
    Join Date
    Apr 2013
    Location
    Wirral, England
    Posts
    24
    I have done everything suggested apart from put the blue summit spring in the back. Having a terrible time getting them here in the UK. Been on back order with my hobby shop since beginning of may. I can only get them from abroad on eBay but I will end up paying about 8 just for a set of springs. Have these been discontinued or something, or are traxxas super slow at manufacturing parts like this?
    I really want my blue springs to give it a go

  10. #10
    RC Racer
    Join Date
    Apr 2013
    Location
    Poland
    Posts
    178
    I am using the same spring setup - black in front and blue at the back with 80wt oil all around. For me it works as a best compromise for different terrains and driving /fun types - asphalt runs, grass, dirt, even jumps! I am only finetuning pretension. Stock shocks so far and yes - they do leak ...

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