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WRT54xx cooling hack

Discussion in 'Modding Forum' started by Disman_ca, Apr 14, 2005.

  1. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    For anyone interested (jagboy) here is a cooling fan mod for the WRT54G. I'm going to try it out shorthly. Might be worth while to read the temp from OID, alas I don't know snmp too well (still learning). If anyone else tries this and charts the temp before and after please share.

    http://www.daleholley.com/linksys/linksys.htm
     
  2. XCOM7

    XCOM7 Network Guru Member

    coOl
    Thanks for the MOD.
     
  3. jagboy

    jagboy Network Guru Member

    that is cool i already saw that page. the only question is that what wire gets solidered were? but by the pics i think i will get a good idea.

    thanks disman_ca


    -jag
     
  4. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    When I try mine, I'll post some pic or something. I'll have to figure it out too as I have a wrt54gs 1.0 and wrt54gs 1.1.
     
  5. t4thfavor

    t4thfavor Network Guru Member

  6. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    Ok first question. Thats a a toggle switch on the back left side isn't it? Second, can you post pics of the underside of the pcb board as we want to see how the fan is hooked up? You did install fan right? I couldn't see anything indicating a fan maybe the switch is for the fan. More details please. BTW, hows the range extender anttena working for you?
     
  7. t4thfavor

    t4thfavor Network Guru Member

  8. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    I like the switch option, I think that will be part of my mod (rocker switch instead). It would be nice to know how everyone is getting the temp readings. I think I'm going to try smtp (OID) but I can't figure out if I can read the temperature.
     
  9. t4thfavor

    t4thfavor Network Guru Member

    it may be difficult to find a good spot for a rocker switch due to small openings in the router..


    i cant find my usb cable for my camera so this will have to do.
    http://edtech.mcc.edu/~cfulton/router/WRT54Gtop.jpg


    the red wire is switched by my very crude switch and the fan draws power from the underside of the board.
    there are three posts under the power plug i believe 2 are neg and one pos. just test with a meter or a small lightbulb.
    the wires should drape around the board without much trouble

    if you have to file a very small notch in the board for the wires. (i did)
    mine is a little noisy because the fan is old and i didnt know that it would go bad so quick

    anything else?
     
  10. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    You link isn't working (thats OK). Good point about the rocker. Last question, is the fan pushing out or in the case? Still trying to go through the snmp OID for the router but can't find anything for the temperature (dam). Thanks for the help, I will be doing my mod shortly and hopefully will remember to takes picks too.
     
  11. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    The only OID I could find posted was .1.3.6.1.4.1.2021.8.1 but I can't seem to read it will Getif. Anyone have any thoughts? I would like to do comparison of temp readings with and without the fan running.
     
  12. t4thfavor

    t4thfavor Network Guru Member

    link should be up in a few seconds im sloooow on dialup and i keep getting dumped
    thats prolly why im not working yet.

    i have the fan blowing out of the case which seems to work the best. i had it blowing in but it didnt keep the bottom very cool.

    i think it will work now link
     
  13. t4thfavor

    t4thfavor Network Guru Member

    trust me you will notica a difference for sure.

    i cant even feel heat on mine anymore

    ive heard of ppl having temp readings in the processor or something but i have never actually seen them done.

    i dont think we really need to be that precise i mean look at my drawings...
     
  14. smithy

    smithy Network Guru Member

    Use a mulitmeter or if you don't have one handy, the centre pin is positive, just trace it.

    If you get the wires back to front the fan will just spin backwards.
     
  15. jagboy

    jagboy Network Guru Member

    will the wrt support the fans wit leds in them
     
  16. jagboy

    jagboy Network Guru Member

    i have a dead wrt and i wanted to know if i could use the dead wrt to supply the power to the fan inside my new wrt54gv2.2 the dead wrt is a wrt54gv2. and i think i have another BEFSX41 the i am not using and i would like to know if i could use that to to supply power to some leds that i am goin to install in my new wrt54gv2.2
     
  17. jagboy

    jagboy Network Guru Member

    i just ripped off the old heatsink of one of my p3 comptures. and i stuck it on my wrt54gv2. it does a amazing job. no fans no wiring. just rubber band yes rubber band and some time and bang you got a cheap way of cooling the wrt that works :D
     
  18. jagboy

    jagboy Network Guru Member

    and oh yea thermal grease
     
  19. b_u_z

    b_u_z Network Guru Member

    lol, any photos?
     
  20. jagboy

    jagboy Network Guru Member

    yes sure

    [​IMG]
     
  21. jagboy

    jagboy Network Guru Member

  22. jagboy

    jagboy Network Guru Member

    i think i fixed it here:
    [​IMG]

    ** admin edited to fit forums....
     
  23. jagboy

    jagboy Network Guru Member

    i might add afan later
     
  24. b_u_z

    b_u_z Network Guru Member

    haha - that's awesome ... does your efficiency go down as things heat up and the rubber loosens? lol.
     
  25. jagboy

    jagboy Network Guru Member

    i dont know. but the heatsink does do its job pretty well. later i might add a fan and use somthing other than rubber to hold it down. my main conern is the rubber melting
     
  26. Wikking

    Wikking Network Guru Member

    LOL....but it looks pretty cool...green heatsink on green board! are you sure you changed anything? maybe it was deliverd with this nice looking rubber band holding the heatsink down ;-)
     
  27. jagboy

    jagboy Network Guru Member

    the rubberband for great. i tested them over a 24hr period and did not melt or anyhting. might pick up some thermal glue. but that coasts money...naw. :D
     
  28. t4thfavor

    t4thfavor Network Guru Member

    i believe that before i modded mine i had to remove the rubber bands. though i wasnt smart enough to photograph them...

    my concern with that heatsink is that if in case that the rubber does break then you will have to worry about that little pointy thing (heatsink) wigglin around inside the router and we all know when wiggly get loose it is never good
     
  29. jagboy

    jagboy Network Guru Member

    currently i still have the heat sink in the wrt and it is still doing a good job. but i also added a fan to it. the fan is huge because i needed to more a lot of air. the power supply does not come from the wrt. i have 2 sources of power i can use batteries or outlet power. i will post some pictures soon.
     
  30. XCOM7

    XCOM7 Network Guru Member

    Here is my modd
    I moded thre Linksys WRT54G, WRT54GS, and RT31P2 :) :p
    It was fun..
     
  31. jagboy

    jagboy Network Guru Member

    how did yuo mod it? fans? lights?
     
  32. jagboy

    jagboy Network Guru Member

    if anyone cares anymore i did some tests on the wrt and the fan and i found that the fan that i installed decreases the temp of the WRT54G by 10 degress
     
  33. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    May I ask how you measured the temp?
     
  34. jagboy

    jagboy Network Guru Member

    i used the thermometer in the picture
    [​IMG]
     
  35. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    lol, low tech but I guess just as effective.
     
  36. jagboy

    jagboy Network Guru Member

    everything is low tech for me i am a 15 year old with no money :D .
     
  37. zgamer

    zgamer Network Guru Member

    Is there a performance difference between no cooling, heatsink only, & heatsink+fan?

    Also compress the pictures a bit man, 180k/image takes forever to load on low and dsl lines.
     
  38. gotamd

    gotamd Network Guru Member

    Performance should not be effected by cooling one way or another.
     
  39. jagboy

    jagboy Network Guru Member

    well yes and no i saw a pretty good increase in performence out of the router
     
  40. zgamer

    zgamer Network Guru Member

    where did you notice the performance increase?
     
  41. jagboy

    jagboy Network Guru Member

    first i noticed that the ping replys were comething in a 1ms instead of 13ms when the fan was on.

    then i saw the cpu usage go down with the fan

    then i saw that i could use my cordlephone that would usually kill my wireless would not anymore with the fan on. strange huh?
     
  42. XCOM7

    XCOM7 Network Guru Member

    What does coooling has to do with CPU usage the CPU usage comes from the Services and ipkg running in the router...
    I didnt see any performance change I did see that my router was way more stable.
     
  43. gotamd

    gotamd Network Guru Member

    That seems like saying that a cooler-running computer is a faster computer (everything else being the same other than temperature). That simply isn't true unless the heat is to the point of interfering with the components in which case you'd probably have instability so it wouldn't matter. As far as I can tell, a WRT54G without any cooling mods does not exhibit any kind of dysfunction. I could see the radio possibly performing better, but I'm not sure of how heat effects the radio's operation. The processor and other things shouldn't be effected.
     
  44. XCOM7

    XCOM7 Network Guru Member

    I agree with you 100% it will not be better but heat is the #1 kill factor for stability.
    I did had problems with my routers thats because I had 3 of them stacked and they will get so hot that I couldnt even touch them.Also cuase of that I had constant router reboots now every thing is very cool and no more reboot!
    Every thing is back stable...
    But again I agree with you these cooling hack will NOT increase power I was aware of these since I started the modd :p
     
  45. jagboy

    jagboy Network Guru Member

    hey you learn new things everyday :D
    so water cooling the wrt would not help to much :D .
     
  46. Anonymous

    Anonymous Guest

    Coolin != performance

    BUT
    With better cooling you can increase the clockrate (simple nvram setting) without breaking stability.

    SO
    Cooling CAN increase performance.
     
  47. craig_oz_land

    craig_oz_land Network Guru Member

    So I take it that a lot of you guys say that the engineers that designed this model made an error with their thermal calculations and this product is borderline overheating?

    Has anyone measured the chip temperatures to determine if there is not enough thermal margin?
     
  48. u3gyxap

    u3gyxap Network Guru Member

    @craig_oz_land
    It doesn't overheat. It is well egineered. We just like modding.
     
  49. ciper

    ciper Network Guru Member

    Try to find a silcone rubber band (usually for hair) because the rubber ones WILL break down from oxidation and the heatsink will fall off. I speak from experience ;)
     

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