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  1. #1
    RC Competitor
    Join Date
    Apr 2013
    Location
    Portugal
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    85

    OS 21 Tm or RB 523?

    I think my trx 3.3 lost compression, which of these two engines is better ?
    I do not run on tracks...sometimes off-road bashing,sometimes asphalt
    I need your support please
    Thanks

  2. #2
    RC Racer
    Join Date
    Jun 2011
    Location
    uk and texas
    Posts
    175
    i like the os.21 tm its a really good engine and a few others here will agree with me on that i have never run a rb 523 so i cannot comment on it

  3. #3
    RC Enthusiast
    Join Date
    Dec 2012
    Posts
    38
    same boat as villageidiot, can't comment on the rb because ive never had one, but ive just put an os.21 tm in my revo and its a brilliant motor.

  4. #4
    RC Qualifier
    Join Date
    Feb 2011
    Posts
    392
    I have the 523 I have a build on here look it up I broke a lot of parts getting that thing settled In but man is I sick look at my build I Love It it wheelies on demand Or if you lower the revo I just moves I love it no problems engine wise got about 2 and a half gallons in it now
    drive it like you stole it

  5. #5
    RC Enthusiast
    Join Date
    Mar 2013
    Posts
    20
    Read this guys post, will definitely detour you from the RB.
    http://www.google.com/url?sa=t&rct=j...45175338,d.aWM

  6. #6
    RC Competitor
    Join Date
    Apr 2013
    Location
    Portugal
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    85
    I will choose The Os 21 too,is a good motor with easy tuning...I already saw videos and discussions in other forums and all guys who have it are happy too, I think it will be the best!

    Thank you all for your support

  7. #7
    RC Racer
    Join Date
    Jun 2011
    Location
    uk and texas
    Posts
    175
    i wish u well with ur new engine u wont be dissapointed

  8. #8
    RC Qualifier
    Join Date
    Jul 2012
    Location
    Baltimore, Maryland
    Posts
    442
    Love my OS, but I'm biased. Have a bored stinger head riser n large intake. Its stays at 134, wheelies on command and has enough grunt to pull abm backflip off a jump.
    BB MERV/T8 Rusty/OS21REVO
    Drive it like its Hot

  9. #9
    RC Racer
    Join Date
    Jun 2011
    Location
    uk and texas
    Posts
    175
    do u have a video or a post on how to make them mods on the os?

  10. #10
    RC Competitor
    Join Date
    May 2012
    Location
    Lake Charles, LA
    Posts
    66
    Quote Originally Posted by Mrmerv76 View Post
    Love my OS, but I'm biased. Have a bored stinger head riser n large intake. Its stays at 134, wheelies on command and has enough grunt to pull abm backflip off a jump.
    Would also love to know these upgrades. those temps sound great mine runs alot hotter then that

  11. #11
    RC Champion
    Join Date
    Mar 2009
    Posts
    1,890
    don't buy any RGB engine for the revo... you will have a left turn lean bog.. go for the OS
    you know.. i never had a sig.. but i do now...

  12. #12
    RC Competitor
    Join Date
    Apr 2013
    Location
    Portugal
    Posts
    85
    Yes ...I had already decided to choose OS
    Thanks

  13. #13
    RC Qualifier
    Join Date
    Mar 2011
    Location
    Uk... Peterborough
    Posts
    489
    ohhh, I just got an RB 523.... waiting for it to arrive....
    Ill deal with the lean if it should appear or sell it on.. never heard of this before but form what I have read now it seems like a pressure and large fuel tank issue so if I keep my stock tank and play with the fuel line and back pressure line Im hoping to work it out as others have.. fingers crossed..

  14. #14
    RC Turnbuckle Jr. Nitronaught's Avatar
    Join Date
    Oct 2005
    Location
    South Florida
    Posts
    18,567
    Seems this discussion of aftermarket Non-Traxxas engines has completed it's course. Both can be used on Revo's and TMAXX's...
    NN
    Founder of H.U.A.
    Hop Ups Anonymous

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