Quote:
Originally Posted by herffstyle
I have an update,
everything is installed, tranny, rear gears with SVX LSD.
I drove the car down the road and all was well at low speed, when i needed to turn it felt strange, kinda like a 4x4 truck in 4wd on pavement. So i belive the center diff is locked or something.
I dont really know how the center diff is set up in the JDM.
I am using a US Spec TCU.
other than that it accelerates quickly and shifts nicely.
Anyone have input?
Think the JDM TCU will fix it?
Thanks
Steve
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Steve
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
