[cfg83]

Zerohour -

Beautiful work.

I wonder, do you have the "FWD mode" fuse holder in your engine bay? :

Disable all wheel drive? - i-Club

fwd fuse

Originally posted by Paisan

4EAT w/o VTD:
Have the FWD Fuse. It can be used for short distances when the temp tire is in place. I you run it like this on a semi-regular basis you will break your tranny. Power split is 80/20 under normal conditions and can go up to 60/40 during slippage, pre-00 4EAT used speed sensors to detect slippage only, post-00 speed, weight and computer pre-emptively splitting power was established. Uses clutch packs to vary torque. When in "1" the ATF line pressure is increased to max pump as well as the clutch fluid pressure, this will give it a faster reaction time according to the factory manuals. Pre-96 4EAT had an initial split of 90/10.

5MT:
No FWD fuse, cannot disable AWD via fuse or easy means. Center diffy is viscous and will vary power. 50/50 initial split with up to 80/20 and 20/80 under slipping conditions.

XT6 5MT:
Same as 5MT but has manually controlled locking center differential that will lock power in at 50/50 no matter what slippage occurs.

4EAT w/VTD:
No FWD Fuse. This has initial split of 45/55 torque and can vary it up to 80/20 and 20/80 during slippage. Uses planetary gears along with clutch packs to vary torque. Also uses speed sensors, weight sensors and computer pre-emptive torque distribution like the 4EAT.

4EAT w/VDC:
Same as VTD but adds: Yaw sensors and use of brakes to stop slippage of individual wheels.

4EAT w/VTD & Sportshifter:
Same as VTD but adds tiptronic like controls for changing gears.

What vehicles have what ATs?
Imprezas/Forester up to 01 had 4EAT w/o weight and Ecu sensors.
Legacy up to 99 had 4EAT w/o weght and ECU sensors.
02 WRX has 4EAT w/VTD
VDC has 4EAT w/VDC
03 Legacy GT has 4EAT w/VTD and Sportshifter
00->03 Legacy and Outbacks have 4EAT w/ weight and ECU sensors
88,89,91 XT6: 4EAT w/o weght and ECU sensors or 5MT w/Locking center diffy.

4EAT non VTD/VDC units have electronically controlled clutch packs (3)
4EAT VTD/VDC units have electronically controlled clutch packs (6) plus a planetary gearset.

Manual Button, and Power Light:

Vehicles with "power" mode light can engage "power" mode when you hit the accelerator quickly, even if you are in the "2" "3" or "D" positions, this will raise your shift points to redline.

Vehicles without the "power" light do the same thing, except there is no light to indicate this.

If you have the "manual" button on your car, then you hit the manual button and place the car in "2" or "3" and the car will be held in that gear regardless of where the 4EAT thinks it should be.

Vehicles w/o the "manual" button, you can start out in 2nd gear by placing the shifter in the "2" slot, this will start you in 2nd gear and bounce you off the rev limiter.

I recently took my '92 SVX to Limreock Park for a track day. I tried several different combinations of gear slections. Finally settled on "2" which kept me in 2nd gear most of the track, when I hit the straightaway, it hit redline and upshifted to 3rd.


Hope this helps.

There you go. Everything and then some you could want to know.

//Mark

It may not help MPG, and the fellow above states that it is not good for your drivetrain, but it might be worth testing if you have the option.

CarloSW2