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Old 08-30-2001, 08:27 AM   #1
EnderW
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Post Pull fuse = AWD - FWD??

Re: MY02 WRX

A friend of mine who owns an older Suby showed me a fuse that I had overlooked before, in the engine compartment's fuse block, which is labelled FWD.

Supposedly, pulling the fuse defeats the AWD system.

Can anyone here verify this, and has anyone tried it?
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Old 08-30-2001, 09:06 AM   #2
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Yes.. such a thing existed... no I haven't looked in my car personally..

Pop your hood... let us know.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 08-30-2001, 09:09 AM   #3
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Actually, I did check my WRX, and the fuse is there. I am going to give it a test this weekend, and see what happens.
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Old 08-30-2001, 09:14 AM   #4
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If you actually remove the fuse cover, you will see that there the fuse holder is actually empty. Putting a fuse IN puts the car into FWD. No, it will not harm your car in any way at all. I asked SOA and they said it is for test purposes and smog check, and will not damage the tranny or void warranty.

-Andy
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Old 08-30-2001, 10:04 AM   #5
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And this is for auto trannys ONLY. Manuals don't have the elctronically controlled center diff.
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Old 08-30-2001, 10:07 AM   #6
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Not on the WRX! The WRX shares the same Main Fuse Box with a N/A Impreza and thats is why it has the fuse slot marked FWD. If you look real close, the slot is empty on the WRX.

The WRX has a VTD A/T which gives it true AWD and it cannot be put into FWD.
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Old 08-31-2001, 09:30 PM   #7
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I think you are also supposed to put the fuse in if you have a flat and use the temp spare due to wheel size differences.
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Old 09-04-2001, 04:05 AM   #8
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not entirely on the subject

but wasn't there some sort of "mod"(resistor jamming of somesort?) to auto that makes the center locked at 50/50?
anybody got any info on that ? i want to try that

and i'm mechanically/electronically impaired so i'd love some instrustions
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Old 09-04-2001, 08:15 AM   #9
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Quote:
Originally posted by SubyTechMaster
Not on the WRX! The WRX shares the same Main Fuse Box with a N/A Impreza and thats is why it has the fuse slot marked FWD. If you look real close, the slot is empty on the WRX.

The WRX has a VTD A/T which gives it true AWD and it cannot be put into FWD.
If this is true then the manual is incorrect, as it clearly states that this is possible in there.

-tim
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Old 09-04-2001, 01:46 PM   #10
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Has anyone tried inserting a fuse into the fuse slot marked FWD? I have since I recently had a rear flat on my 99 Legacy 4eat. As the manual documented, the fuse holder under the hood near the firewall on the passenger side is empty. Inserting a fuse will disengage AWD... a little FWD indicator comes on by the idiot lights. Not sure how it is with newer models, but I wouldn't imagine Subaru would get rid of this feature as it's for maintenance/emergency purposes.

AG
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Old 09-04-2001, 01:47 PM   #11
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I wonder what kind of damage to the center diff one does on a manual tranny car when using the provided spare tire... hopefully I'll not have to find out!

-tim
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Old 09-04-2001, 02:41 PM   #12
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can you use this fuse if you want to put your car on a Dyno??
i have a manual and i think i have seen the empty place in the fuse box.

if it works , it would be really easy to dyno the car..

i have a my/2000 2.5 RS
Can i do this??
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Old 09-04-2001, 02:42 PM   #13
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My understanding is that this does not work with manual cars.

-tim
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Old 09-04-2001, 03:41 PM   #14
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If you can damage the car by putting the spare on, why don't they give us a full size spare?
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Old 09-04-2001, 03:50 PM   #15
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I own a manuel 2.5 RS and i have the empty space in my fuse box

i just wonder, how many volts is the use that is suppose to go in there??
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Old 09-04-2001, 03:51 PM   #16
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1) In the WRX the VTD adds a true to life viscus coupling center diff AFTER the clutch pack, so yes, it's possible to pop the fuse in and elimintate the AWD.

2) The manual transmission Subaru's are MECHANICAL so you CANNOT convert them to FWD unless you take the transmission apart.
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Old 09-04-2001, 04:05 PM   #17
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There seems to be some confusion about VTD. Subaru Manual Transmissions use a Viscous Couple in the center diff., the A/T w/VTD uses a planetary gear set combined with a hydraulic clutch pack in the tail housing.
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Old 09-04-2001, 04:32 PM   #18
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Has it been determined that this can be done in a manual transmission?

BTW, I got away with a 7amp fuse. Didn't see anything that listed a specific fuse rating, but it didn't pop.

AG
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Old 09-04-2001, 04:48 PM   #19
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No, there is no electrical method of making a M/T FWD only, and there is no electrical method of making an A/T w/VTD (WRX) FWD only.

If someone can be specific about where this is described in writing please inform us. I suspect if it is in a manual it is referring to an Impreza with a conventional (non VTD) 4EAT.
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Old 09-04-2001, 07:17 PM   #20
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Default FWD

I heard that your not supposed to go over 50MPH or so if running FWD. Is this true?
Also, If you can go whatever speed you want, would this improve 1/4 mile times, or have any kind of performance benifit (other then loss of traction in turns)
Mike
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Old 09-05-2001, 01:03 AM   #21
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If i have a manual transmision on a 2.5 RS my/2000 sedan, and i can clearly see in the fuse box somewhere it is say FWD, but the space where the fuse is suppose to go in, is empty. So what is that empty space for?? what will my car do if i get a fue in there?
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Old 09-05-2001, 02:41 AM   #22
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Quote:
Originally posted by SubyTechMaster
There seems to be some confusion about VTD. Subaru Manual Transmissions use a Viscous Couple in the center diff., the A/T w/VTD uses a planetary gear set combined with a hydraulic clutch pack in the tail housing.
So can you answer this: Is the torque split something that could be electronically variable by the driver (with some modifications of course) on the VTD equipped cars?

I like the already rear biased torque, but would like a little more for dry weather, and less for more slippery conditions.

I realize that any intervention would likely disable the effectiveness of the VTD, but for racing purposes, a touch more consistant rear bias might be nice.
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Old 09-05-2001, 09:29 AM   #23
SubyTechMaster
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On a M/T vehicle, the fuse slot is there (but empty) because the same fuse box is used in the A/T vehicles.

As for the variable torque split, it is 55/45 and the TCU can vary it as far as 50/50. If the TCU can vary it I don't see why you couldn't bypass it, but the mechanical nature of the design won't allow more than 50% to the rear.
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Old 09-05-2001, 11:05 AM   #24
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Quote:
Originally posted by SubyTechMaster
[BAs for the variable torque split, it is 55/45 and the TCU can vary it as far as 50/50. If the TCU can vary it I don't see why you couldn't bypass it, but the mechanical nature of the design won't allow more than 50% to the rear. [/b]
Fairly certain that it's already 55% rear bias. So I'm guessing you mean no more than 50% front?

If that's the case, I don't consider that a problem. I've found a solid 50/50 split to be pretty well optimal on snow and ice anyway.
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Old 09-05-2001, 01:47 PM   #25
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You are correct, a VTD provides 55% rear, 45% front under normal operation. However, in the previous post, it was said -

"I like the already rear biased torque, but would like a little more for dry weather, and less for more slippery conditions"

I understood this to mean you were wondering if more torque could be sent to the rear in dry conditions. The answer is, not without changing the planetary ratio. I realize the way I said it was not clear. Mea culpa.
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