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  1. #1
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    Purple 3906 Build almost complete

    Well when I met my wife back back in 03'. I was a TC guy. She bought a 3906 E-maxx for a "bonding expirence." Unless you are doing the driving
    TC racing is pretty boring. Well The truck was more or less sitting on a shelf since I got a T-Maxx. Lately I have been drawn back to electric and decided to resurrect the 3906 in purple and blue AL.

    Upgrades from stock as follows:

    Traxxas:
    Black hex screws
    3905 diffs (current stock fluild but going to 120k)
    3905 driveshafts
    Blue Al bulks F & R
    Blue Al lower chassis braces
    blue Al antenna nut
    Blue Al wheel nuts
    3905 Turnbuckles
    5605 knuckles (E-Revo; larger bearing and steel ringed arround pivot ball)

    Lunsford:
    Ti hinge pins

    Ti-22
    Blue titanium beadlocks (yes real Ti and just as light as maximizer plastic ones)

    RPM (all in purple)
    A-Arms
    wear plates
    bulkhead braces
    shock towers

    Imex:
    k-rocks tires

    Proline:
    T-maxx steering kit (3906 chassis mod needed)

    Parma PSE
    Sport trac body (I painted this when we got the truck in 03 just ran this year and body cracked in 1st run, paint chipped in second)

    JR
    650M servo

    Team Associated
    factory team blue heatsinks for e-maxx
    factory team blue shock for t-maxx with 4 stock 4 trinity springs

    Shock socks off of ebay for $4

    Motor and gearing:
    I have a RRP slipper I need to put back on. Currently stock slipper with 12/72 gearing on a single Titan.

    How the single titan come about.
    Tonight I did a test run and in the process a I had a pinion grub screw come loose. With the low gearing it seems to run fine on a single titan so I am keeping it that way. Keeps cool with with a 90% of the time in first and the heatsinks. The single titan is a reverse rotation out of a e-revo. They are alot cheaper than the standard ones on eBay. The diffs have been flipped to correct revers direction. Single titan set on passenger side to compensate for reversed torque twist. This truck was built HD for the noobie in mind. The single motor will slow it down and improve confidence. May drop it down to 9T pinion as well. Great run time with this setup with some GP3300's from 2003.

    A little dirty but here are a few quick shots I took for this thread:











    From here I have a few things left to do.

    Steel idlers to bulletproof the drivetrain
    Put the RRP slipper back in
    Get some cooler bumper and a new shell
    Considering dropping in the traxxas blue waterproof electronics like in my 3905.
    It may be spilled milk, but I wish I had won this HCR Purple chassis on eBay a while back. I didn't even bid on it and it went for $64.78. It would have added just the right touch.
    Last edited by OCD RC; 04-25-2009 at 01:44 AM.
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  2. #2
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    wow thats awsome. gtood job.
    i bet my Quad could out RIP your Quad!!

  3. #3
    RC Racer
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    Canada
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    That sucks you didn't get the chassis it would look pretty sharp with it. O well Keep on the look out for it
    3905 emaxx Purple Project dual titan 775

  4. #4
    RC Qualifier
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    Peterborogh ON Canada
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    Quote Originally Posted by OCD RC
    It may be spilled milk, but I wish I had won this HCR Purple chassis on eBay a while back. I didn't even bid on it and it went for $64.78. It would have added just the right touch.
    i was thinking of buying that but didn't.
    Remember to drive it like you stole it

  5. #5
    RC Champion
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    are you running it on one motor?
    i bet my Quad could out RIP your Quad!!

  6. #6
    RC Racer
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    Quote Originally Posted by Chris York
    are you running it on one motor?
    it looks like one titan 550
    why not run two?
    did it fry?
    3905 emaxx Purple Project dual titan 775

  7. #7
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    Quote Originally Posted by emacks
    it looks like one titan 550
    why not run two?
    did it fry?

    Yea just a single titan. It is geared down really low 70/12 (I put the RRP slipper in after I wrote the thread) so it doesn't strain the motor any more than standard gearing with twin motors. In the end it just runs a lot slower. Still have plenty of grunt for climbing and can pop a slight wheelie with WOT from dead stop. The lower power output of a singe motor plus the HD build is noobie friendly.
    Last edited by OCD RC; 04-25-2009 at 12:58 PM.
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  8. #8
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    I did anothe run today. With those tires and a 12/70 gearing and 6 year old gp3300 I got 17 minutes runtime. Mostly in 1st gear.

    I have the 9T pinion on order.
    12/70 overall
    46:1 1st
    28.6:1 2nd

    9/70 overall
    61.2:1 1st
    38.1:1 2nd

    A few passes in 2nd gear with the 12T tended to heat up the motor. I think a full pack of 2nd gear may get it pretty hot. I mostly ran 1st gear. It ran cool but could use a little more speed for bashing and a little more torque for climbing as it is only a single motor. I think the 9T will solve by allowing me to use the ratios of the 2 speed for each purpose. Also it should keep temps in check in 2nd gear with those big tires.

    Toward the end of the run I notice that the blue anodizing with the natural metal looked pretty good:
    Last edited by OCD RC; 04-26-2009 at 08:37 PM.
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  9. #9
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    how do you like the traxxas chassis brace?
    i bet my Quad could out RIP your Quad!!

  10. #10
    RC Champion
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    Quote Originally Posted by Chris York
    how do you like the traxxas chassis brace?

    They look good andthe RPM center skid should keep them new looking a long time. I have only broke one of the plastic ones so stock would have been just fine. I got the braces an aluminum package deal.
    Last edited by OCD RC; 04-26-2009 at 10:08 PM.
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