Results 1 to 18 of 18

Thread: B20A auto trans problem

  1. #1

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    B20A auto trans problem

    Ok I am freaking out now. I was planning on using the auto tranny that came with the motor BUT.. this one has shift solenoids on top of the bellhousing> I took them off and they have fluid under them, O gasket, and actually function for something. I thought since this tranny had the throttle cable control that it didn't use shift solenoids. Any body know how I can get around these, I am not using any electronic engine or tranny controls,ecu, etc.. This is a carbed project, and Im using a D16zc dohc vaccuum dizzy for now. HELP
    [IMG][/IMG]
    also , anybody know what I may be doing wrong with the pics, they are taken with a nice camera, but are losing a LOT of quality from DL them to PC then to photobuckett.
    Last edited by 2oodoor; 07-20-2008 at 12:23 PM.



  2. #2
    Accord of the Year - 2008

    TWOLOUDNPROUD's Avatar
    Join Date
    May 2003
    Vehicle
    89 Accord No Motor and 88 Accord HB LX-i
    Posts
    3,350

    Re: B20A auto trans problem

    you need to use auto Ecu and the trany ecu from a 88-91 prelude and you will need to add wire's to run the trany,that why i did not use the auto trany that came with mine b20a.
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

  3. #3

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    NObody warned me~ arhghhh.
    I have to break out a wire harness and controler for a prelude? what does it read? I am not going to be using any fuel inj hardware, MAP sensor?
    This sucks donkdonk.
    crap I can't use my A20 transs either cause the solenoids are in the bell housing, back to the drawing board...
    wanted, 5 speed

  4. #4

    AccordB20A's Avatar
    Join Date
    Sep 2005
    Vehicle
    1987 Honda Accord 2.0Si
    Location
    Stratford, New Zealand
    Posts
    7,407

    Re: B20A auto trans problem

    put it in and apply power to both of the solenoids. if your TV cables adjusted right it will work anyway. mine did

  5. #5

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    Quote Originally Posted by AccordB20A View Post
    put it in and apply power to both of the solenoids. if your TV cables adjusted right it will work anyway. mine did
    sweet, I know there has to be a work around for those, 12 volts?
    I need to figure out exactly what they do, prelude power does not seem to have much about those.

    I noticed this motor has an oil cooler, a can under the oil filter that coolant runs thru. hrmmph.

  6. #6

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    If this is the same as 3rd gen prelude transmission solenoids, it looks like there is a TCM for carbed preludes. I am not sure what all plugs in as effective. I wonder how I could hack this to get the best benefit of the solenoid feature.
    There was going to be an issue for me using the 38 weber in regards to the throttle valve cable since the 38 can cruise with just light pressure on the pedal, then when you want to go I wouldnt want it downshifting always.

  7. #7

    carotman's Avatar
    Join Date
    Jul 2000
    Vehicle
    89 Accord LX/B20A | 87 Accord Hatch "S" Stock | 94 Civic Hatch CX
    Location
    Montreal South Shore
    Posts
    9,984

    Re: B20A auto trans problem

    Yes, the carbed 88-89 ludes have an ECU.

    I noticed that the B20A and A20A auto trannies seem to be the same, The difference lies in the bellhousing. Maybe you can swap the housing from the B20A on an A20A tranny and work around the solenoid problem?

    http://pages.videotron.com/omus
    3geez member since July 12 2000

    I need these parts!
    https://www.3geez.com/forum/showthread.php?t=67742

  8. #8

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    Quote Originally Posted by carotman View Post
    Yes, the carbed 88-89 ludes have an ECU.

    I noticed that the B20A and A20A auto trannies seem to be the same, The difference lies in the bellhousing. Maybe you can swap the housing from the B20A on an A20A tranny and work around the solenoid problem?
    the solenoid and the underneath fluid path are ON the bell housing !
    You don't happen to know of a jdm wiring diagram for the accord or is it identical to 89 civic and preludes regarding the extra solenoid controls.

  9. #9
    SEi User Hauntd ca3's Avatar
    Join Date
    Sep 2007
    Vehicle
    1988 ca3 si exclusive
    Location
    new zealand
    Posts
    1,878

    Re: B20A auto trans problem

    i think those solenoids have something to do with the lock up converter from memory.
    just go the 5 spd way

  10. #10

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    no 5 speeds available Haunted
    does anybody have a hydraulic schematic of the JDM auto tranny?

  11. #11
    Accord of the Year - 2008

    TWOLOUDNPROUD's Avatar
    Join Date
    May 2003
    Vehicle
    89 Accord No Motor and 88 Accord HB LX-i
    Posts
    3,350

    Re: B20A auto trans problem

    Talk to AccordB20a he can get the B18a bellhousing then you can use the a20a 5speed and make you a trany for your B20a.I was going to buy it from him but you need it more then me.
    LX-R coming soon Here's a hint. 89mm stroke/ 41.60cc head /ARP head & main stud's /SRP piston's 81.5mm 9:5:1/Crower Rod's & more to come

  12. #12

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    If anybody knows the fluid path or where I can find a breakdown of where/how these orifices work, please post something.
    The round rubber gasket is bad and this leaks so I need to find out if any usdm will work. There are two solenoids that open up the flow beteen both sides (top and bottom hole accordingly) I am sure they are for lock up converter and I was told that if I am not using a TCM I can just wire both solenoids hot to the key switch. If that is so then I wonder if there is another bypass that will retain full functionality of this device.
    The picture of the side bell housing shows some cooling vents and several 10 mm bolts holding something, anybody know what it is?
    bottom of solenoid block (off the car in this pic)
    [IMG][/IMG]
    top of the tranny with solenoid block off, shows the orifices and one check valve on the right . Note the center hole is for a bolt for the sol. block as are the two on each far end.
    [IMG][/IMG]
    side of bell hsg. shows bolts and cooling vents
    [IMG][/IMG]
    Last edited by 2oodoor; 10-19-2008 at 01:09 PM.

  13. #13

    carotman's Avatar
    Join Date
    Jul 2000
    Vehicle
    89 Accord LX/B20A | 87 Accord Hatch "S" Stock | 94 Civic Hatch CX
    Location
    Montreal South Shore
    Posts
    9,984

    Re: B20A auto trans problem

    Honestly, I would just use a TCU and don't worry about anything.

    http://pages.videotron.com/omus
    3geez member since July 12 2000

    I need these parts!
    https://www.3geez.com/forum/showthread.php?t=67742

  14. #14

    carotman's Avatar
    Join Date
    Jul 2000
    Vehicle
    89 Accord LX/B20A | 87 Accord Hatch "S" Stock | 94 Civic Hatch CX
    Location
    Montreal South Shore
    Posts
    9,984

    Re: B20A auto trans problem

    I have an 88 Prelude shop manual I could send you if you want (pdf format)

    It seems to be "easy" to use the Prelude TCU

    One is the shift solenoid, the other is the lock up solenoid.

    The Prelude uses an "AT speed pulser". Does the Accord has this on the back of the tranny? (another electric connector)

    Maybe you can get the real JDM thing. Seeing how many overseas members we have here, I'm sure we can work things out!

    http://pages.videotron.com/omus
    3geez member since July 12 2000

    I need these parts!
    https://www.3geez.com/forum/showthread.php?t=67742

  15. #15

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    ^^^ thanks
    this is a carbed application on a carbed oem chassis so I don't have any electricals for those TCM (TCU)
    The thing is, this transmission is a hybrid of sorts. It only used the lock up solenoid block, otherwise still has the cable just like our USDM 3rd gen.
    After thinking about it without any references, It appears that there is fluid bypass with the solenoids off, then fluid runs another channel to operate the lock up when the soleniods are energized. I do not think one is off one is on or anything. Or of course visa versa of what I said ^^^. I think I can control lock up with a switch or just have a relay energize the solenoids off of the D4 light circuit.
    If you look at the bottom of the block you can see a channel between the two lower orifices, that is where fluid bypasses. All the other channels you see is where the o ring gasket goes.
    The thing I really need to find out is if there are more than more stages of converter clutching besides the rpm driven centrifigal, rpm driven fluid pressure (standard line pressure), and lock up. I don't think any body used that back then though.
    I am assuming here that there are two solenoid because one is inlet the other outlet for pressure to pass thru for lock up control. Not two different stages of lock up.
    Last edited by 2oodoor; 10-26-2008 at 12:38 PM.

  16. #16

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    issue was more or less resolved..
    I used permatex grey esp for transmissions, to create the gasket for the solenoid block.
    I have toggle switches (2) connected to each solenoid. When I get to highway speed and cruising I flip on Sol A then B and it locks up the converter thus dropping rpms by around 300. So I am crusing 70 mph at 3100 instead of 3400 rpm.
    When I have to coast down a step grade I turn them off, and they are always off in traffic, coasting, or braking. You can not have them enegized all the time, it will destroy the tranny.

    I did not have as much problem with getting the TV cable set to work with the weber 38, as I predicted. It does pretty good but just like the progressive weber, you have to be carefull how far you mash the gas pedel because it will drop down too low of a gear sometimes.
    I average around 24 mpg, not too good but works for me.

  17. #17

    2ndGenGuy's Avatar
    Join Date
    Jan 2005
    Vehicle
    1981 Accord Hatchback, 1984 Accord Sedan
    Location
    Seattle, WA
    Posts
    9,697

    Re: B20A auto trans problem

    Better than what I got. I got around 15mpg last trip I took to Portland. Car was running pig rich, about 11:1 and sometimes off my O2 sensor scale, even tho it idles just fine at around 14:1... :-/

  18. #18

    2oodoor's Avatar
    Join Date
    Jun 2006
    Vehicle
    86 LX JDM B20A
    Location
    Georgia-lina
    Posts
    9,062

    Re: B20A auto trans problem

    Quote Originally Posted by 2ndGenGuy View Post
    Better than what I got. I got around 15mpg last trip I took to Portland. Car was running pig rich, about 11:1 and sometimes off my O2 sensor scale, even tho it idles just fine at around 14:1... :-/
    sounds like you could use some emulsion tube changes... does it still go pretty good at cruise speed with just very light throttle? Are you using the power valve or is it disabled? I think I need to do that but then I wouldneed to rejet it and I have no wideband at this time. Mine is pretty rich at idle, the carb was set up for 12 valve motor though.

Similar Threads

  1. B20A Gold Top with auto trans for sale
    By OldSchool86 in forum For Sale
    Replies: 0
    Last Post: 09-07-2009, 10:42 AM
  2. F.S. B20A with auto trans
    By OldSchool86 in forum For Sale
    Replies: 2
    Last Post: 08-03-2009, 01:45 PM
  3. B20A Auto trans for sale
    By OldSchool86 in forum For Sale
    Replies: 0
    Last Post: 05-24-2009, 10:07 PM
  4. JDM B20a Auto trans for sale
    By mykwikcoupe in forum For Sale
    Replies: 0
    Last Post: 05-01-2009, 07:38 PM
  5. Exhaust problem? ( Auto Trans Problem )
    By Jay's89Lxi in forum 3geez Accords
    Replies: 5
    Last Post: 01-18-2005, 04:24 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.
     
Links monetized by VigLink