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#16
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Re: jdm svx trans, will it work?
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Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#17
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Re: jdm svx trans, will it work?
All you need is a circuit that will invert the signal going to the solenoid. Since on the JDM trans full power = AWD, not FWD as in the US model. Wouldn't be all that difficult, and probably lots easier than getting a JDM TCU. I'm sure I could come up with a circuit that would work, I'd just need some time!
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1992 SVX LS-L #1222 Pearl White 1987 GL Turbo wagon, 5 lug conversion, D/R 5 speed (Rice killer) 1992 Dodge Ram 4x4 diesel (car hauler) 1968 Dodge Polara convertible (Camaro killer) 1990 Toyota Corolla FWD auto (330,000 mile grocery getter) 1986 VW Jetta |
#18
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Re: jdm svx trans, will it work?
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Tom |
#19
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Re: jdm svx trans, will it work?
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It is the different solenoid which reverses the “command” of the TCU signal. When using a JDM transmission, you must fit the appropriate C solenoid valve, i.e. one that is normally open and NOT the US one which is normally closed. You should also be using the JDM TCU, otherwise as I have pointed out, the programming will/may not be correct, which is no doubt the current situation. The US TCU is programmed for a clutch, the JDM for a differential.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#20
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Re: jdm svx trans, will it work?
would it not have the same effect and still maintain the proper programming if you simply used a JDM TCU?? This is the right way to do it in my mind
Tom |
#21
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Re: jdm svx trans, will it work?
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I agree that it is confusing, but no. Please refer --- http://www.subaru-svx.net/forum/show...t=35942&page=4 Cheers, Trevor.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! Last edited by Trevor; 07-17-2009 at 01:20 AM. |
#22
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Re: jdm svx trans, will it work?
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Aside from the debate about whether you should be using a US spec Sol C or a JDM spec Solenoid C, I'm of the opinion you should be using a JDM type TCU to control that gearbox. The TCU has different maps for each gear It uses a large range of data inputs to ensure traction works, and that it works in tandem with your ABS. Essentially you are now using [US] maps that vary traction from 10% rear standard mode to 50% rear under hard acceleration which is the US gearbox specs. These US traction maps are incompatible with the gearbox you now have fitted, which has normal standard distribution to the rear of 64%, varying upwards to 50% under hard acceleration [VTD maps, JDM traction control] Were you to completely disconnect the signal to Solenoid C, I would suspect in default mode your gearbox should operate permanently at 36% front and 64% rear and be entertaining to drive. I'm wondering if perhaps with the signal your American TCU is getting from the Solenoid C that the incompatibility issue may be causing it to lose its marbles and go to 50/50 lock up? Also, the symptoms you describe sound like 50/50 centre diff lock-up. Please check if the fuse is inserted under the hood. In the US cars, inserting the fuse causes 100% front wheel drive, and does no harm. With the JDM gearbox, inserting the same fuse locks the centre diff 50/50, and will do harm if you keep driving in that mode. My best advice is you need a JDM style TCU. Even the UK/OZ type will be less than ideal. It will have the correct traction maps but uses different speed input data. BUT CHECK THAT FUSE IS NOT INSERTED! Joe
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#23
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Re: jdm svx trans, will it work?
Joe,
Please do not add to the confusion. There is no debate regarding the different C solenoids fitted to the US clutch system and the JDM and others using a centre LS diff. Without doubt, the solenoids are different as has been stated. The reason is clear and not difficult to assimilate. Trevor
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#24
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No debate?
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No debate on the C solenoids? You could have fooled me. When you have Tom and Harvey and you, and a couple of others to boot, throwing in suggestions that differ, I take that to be a debate, am I mistaken? Plus I think Tom and you and I have essentially said the same thing, use a JDM type TCU? Hopefully that does not add to the confusion. Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
#25
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Re: jdm svx trans, will it work?
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Tom |
#26
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Re: No debate?
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I have proven what I have stated is fact with detailed information. If in doubt please physically check your own cars which have a centre diff. The C solenoid will close when energised, i.e. it is normally open. Also refer post in the opposition forums from a member from Norway, requiring a C solenoid. Trevor
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! Last edited by Trevor; 07-17-2009 at 03:34 PM. |
#27
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Re: jdm svx trans, will it work?
More or less I think we are all saying the same things, just mixed it all up. From what I have gotten from all this and my understanding of how they all work here are a couple scenarios
Trans-TCU- SOL C US-US-US JDM-JDM-JDM JDM-US-US US-JDM-JDM basically as long as the Sol C. Matches the TCU being used it will function properly. Thats my understanding and why anyone would need to make it more complex is complex in itself Tom |
#28
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Re: jdm svx trans, will it work?
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The TCU and solenoid must match the transmission. i.e. US-US-US, or JDM-JDM-JDM, are the only arrangements which will work correctly.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! Last edited by Trevor; 07-17-2009 at 03:49 PM. Reason: Addition. |
#29
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Re: jdm svx trans, will it work?
Thats what I was saying originally but you told me it required a US solenoid if you were going to use a JDM trans and TCU... hence the confusion... Maybe I just read it wrong
Tom |
#30
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Re: jdm svx trans, will it work?
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If in any way I posted a confusing statement advise where, so that I may quickly apologise and correct same. Throughout my aim and intent has been to retain accuracy within the thread, in order to prevent the annoying confusion which has been established as a result of incorrect statements. Sincerely, Trevor.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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