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  1. #21
    Join Date
    Apr 2005
    Location
    Erie, PA
    Posts
    351
    Country Flag: United States
    Well,

    After talkeing to SPAL online trying to figure out how to wire in a high-speed bypass, it will need 3 external relays to get this done.
    So I chickened out and ordered one of these new DIF PWM Controllers. It has everything I want and handles 50 amps continous load.



    Anyone wants to buy a never run SPAL V3 unit?

    http://www.popularhotrodding.com/hot...nte_carlo.html
    Andreas
    President First Gen Monte Carlo Club
    www.fgmcc.com


  2. #22
    Join Date
    May 2006
    Location
    Ontario, Canada
    Posts
    45
    Well at least they responded to you... I still haven't heard back. I'll likely be selling my SPAL V3 as well.

  3. #23
    Join Date
    Apr 2006
    Location
    Huntington Beach, CA
    Posts
    2,323
    Country Flag: United States
    Who makes or what is the DIF PWM controller?

  4. #24
    Join Date
    May 2006
    Location
    Ontario, Canada
    Posts
    45
    I'm going to take a stab in the dark and guess he's talking about DC Controls - I had one of those years ago and it died after getting caught in a light rain. Their customer service was terrible as well - I waited over 3mo (ignored emails and empty promises) for a replacement before finally asking for a refund instead.

    I usually try to "keep it simple" and it seems to be the way to go with fan control. Relays generally never die, and controllers seem to be extremely flaky from my experiences. I've had three die on me altogether - the one DCC unit, and two early model SPAL units (one stopped working, one stuck on 100% all the time).

  5. #25
    Join Date
    Mar 2005
    Location
    Walton, NY
    Posts
    665
    I spent $200 on SPAL crap and have never had it work right, it's definitely the older version. My $10 HD relay works like a champ though.

  6. #26
    Join Date
    Apr 2005
    Location
    Erie, PA
    Posts
    351
    Country Flag: United States

  7. #27
    Join Date
    Jul 2008
    Location
    Dallas, TX
    Posts
    259
    Im running a Mark VIII Fan with a 70amp relay and a PAC-2700. Works perfectly. Probably a little over kill actually. I got it thinking I could wire the fan to two speeds (which I later found out you can't) If I ever replace the fan though, I'll do dual fans and the controller can change the turn on times to each fan indiviually.

    The controller:
    http://www.dakotadigital.com/index.c...641/prd641.htm

    The relay:
    http://order.waytekwire.com/productd...POWER%20RELAY/
    '69 Chevelle - LQ4/T56
    '90 Miata SM racecar - 1.6L/5sp in progress
    '71 GMC SWB Fleetside - 5.3/4L60E in progress

  8. #28
    Join Date
    May 2006
    Location
    Ontario, Canada
    Posts
    45
    Some Mark VIII's are two speed - I have bench tested mine and it is indeed a two speed fan, so I will be wiring it that way. Here's some options for both single and two speed wiring:

    http://www.motortopia.com/files/cars...Thumbnail1.jpg



    http://www.motortopia.com/files/cars...Thumbnail1.jpg



    The following is only required because of the draw of a Mark VIII fan on high, and the fact it's nearly impossible to find a 5-pin 70A+ relay:
    http://www.motortopia.com/files/cars...Thumbnail1.jpg


    If anybody wants a better quality pdf/jpg, I could send a copy.

  9. #29
    Join Date
    Jun 2008
    Location
    Cumming, GA
    Posts
    138
    Country Flag: United States
    Check out Delta controller. Best around with variable speed...

    http://www.dccontrol.com/0820.htm

  10. #30
    Join Date
    May 2006
    Location
    Ontario, Canada
    Posts
    45
    Quote Originally Posted by LSX1STGEN View Post
    Check out Delta controller. Best around with variable speed...

    http://www.dccontrol.com/0820.htm
    Quote Originally Posted by 85_SS View Post
    ...DC Controls - I had one of those years ago and it died after getting caught in a light rain. Their customer service was terrible as well - I waited over 3mo (ignored emails and empty promises) for a replacement before finally asking for a refund instead.
    Just as unreliable as SPAL from my experience, only with worse customer service.

  11. #31
    Join Date
    Jul 2005
    Location
    Marshall , MO
    Posts
    696
    Anyone ever looked at a speed controller for a robot. http://www.myskunkworks.net/servlet/...ers/Categories or http://www.robotpower.com/products/osmc_info.html they are not plug and play but should be able to handle any fan you can come up with.
    Brad Shepard
    69 Malibu
    Marshall, MO

  12. #32
    Join Date
    Apr 2005
    Location
    Erie, PA
    Posts
    351
    Country Flag: United States
    Quote Originally Posted by LSX1STGEN View Post
    Check out Delta controller. Best around with variable speed...

    http://www.dccontrol.com/0820.htm
    I have checked them out before. I am just not a big fan of in-radiator temperature sensors.... Hence I will give the DIF controller a try...

    http://www.popularhotrodding.com/hot...nte_carlo.html
    Andreas
    President First Gen Monte Carlo Club
    www.fgmcc.com

  13. #33
    Join Date
    May 2006
    Location
    Ontario, Canada
    Posts
    45
    After finding out that the Mark VIII fan was too much for the SPAL V3 to handle, I decided to scrap the whole controller idea and make up my own harness/diagrams for a hopefully trouble free system. I designed it so that it operates much like an electric fan in newer cars. It also has a high speed manual override switch, as well as feedback through a single RGB LED for the various states (high/low/AC).

    Here's the final schematic and wiring diagram I designed:





    Mark VIII fan installed:





    Relays/custom harness wired up and ready to go:


    (figured I may as well make use of the Maxi-fuse holder from a painless 70A wiring kit I decided not to use)


    Relay rack fits nice and snug next to battery (one more relay was added for proper LED control due to fan motor feedback on opposite speed):



    And finally here's the LED in the different stages (mounted at manual override switch/temp gauge):

    Off:


    Low Speed:


    High Speed:


    A/C:


    It will be nice to finally have a trouble free, fully operational fan setup - beats the unreliability of these worthless controllers out there!

  14. #34
    Join Date
    Apr 2008
    Location
    Anaheim, Ca
    Posts
    99
    This thread is awesome! Would be great for a how to section, lots of good info.

    Thank you for saving me from buying a spal controller for a mkVIII fan.
    Kenneth N.

    1969 Mercury Cougar XR-7 Boss 429 clone under construction

  15. #35
    Join Date
    May 2006
    Location
    Ontario, Canada
    Posts
    45
    Not a problem, I had to go through it anyways in order to decide what I wanted to do, and figured I may as well share as I know a lot of people like to use this fan.

  16. #36
    Join Date
    May 2006
    Location
    Ontario, Canada
    Posts
    45
    Due to the unexpected operation of the Hayden controller with the engine off, I have made one final change to the diagram so that the fan will only run with the car on.
    What was happening is the fans would run for a minute or two when the car turned off (as expected and designed for). I expected this might happen 2-3 times as the coolant would increase in temp again a few times once the fan stopped. This did happen, but the odd part was after a while the controller would call for the fan to be on for a split second every minute or so and this went on basically until the car naturally cooled down. This wasn't good for the battery and left me with just enough juice to crank the car over a couple times. I didn't like the idea of possibly getting stranded with a dead battery, so I made a minor change that only allows the fan to run with the ignition on:

    http://www.motortopia.com/files/cars...Thumbnail1.jpg


    http://www.motortopia.com/files/cars...Thumbnail1.jpg


    On a side note, regarding how to tell the difference between the 1 and 2 speed Mark VIII fans, I put this quick image together for reference:

  17. #37
    Join Date
    Nov 2004
    Location
    Dallas Texas
    Posts
    496
    Country Flag: United States

    fan wiring 101

    this needs to be stickied! good job guys!
    Rich
    69 Trans Am "TireBird"
    M6 / LS6 minitubbed DSE Sub
    C5 frt LS1 rear disc brakes
    https://www.pro-touring.com/forum/showthread.php?t=14992
    69 R/S Z28 302
    15 Camaro ZL1
    90 Formula next project

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