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Old 08-13-2005, 10:36 PM   #1
Koss
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Question Stupid Question: Can you use the FWD fuse to drive the car every day?

Why? It's late, I'm tired and was just thinking about improving the gas mileage on my 91 Legacy Sedan by disengaging the AWD and making it a front wheel drive only during the summer, then slipping the fuse out when the snow comes here to Colorado. Or would this turn some enormously expensive parts into metal shavings? Hey, it's my first Subaru, and only bought it for the gas mileage and the fact that it was only $500 bucks. Turns out, I love the car. Thanks
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Old 08-14-2005, 01:10 AM   #2
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Well, I believe if you go by the manual it says bad things will happen, and I think you understand where they are coming from. I have a friend with a older suby that has done this for many years with no problems. So its hit or miss in my opinion, but if your driving a stick it wont work anyway.
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Old 08-14-2005, 02:59 PM   #3
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No, Auto trans Power/Manual modes. Hmm. Still thinking about it, but uncommitted. Also, I was thinking that if it's like most 4WD vehicles I've owned before, that if there were any parts that depend on the system being engaged to lubricate, that perhaps engaging it once a week would lube those parts. On the other hand, It is probably very different than the trucks I've owend over the years, AND I drive 112 miles a day, 5 days a week. So I tend to chew up vehicles pretty fast and anything I might try is more likely to have an effect than most drivers. Oh, the owners manual doesn't say not to drive with the fuse in, it just says that "normally" the fuse is out, and is put in for maintenance or diagnosis purposes, so I don't know what to think. Thanks!

Last edited by Koss; 08-14-2005 at 03:23 PM.
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Old 08-14-2005, 05:41 PM   #4
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No.

It won't help your mileage, and it will more then likely cause premature failure of the duty c solenoid.

Check out www.bbs.legacycentral.org Lots of info on the first gen legacy.
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Old 08-15-2005, 12:44 PM   #5
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I think you may confusing the SLIGHT mpg loss on an AWD system with the severe mpg loss suffered from 4WD systems.

Dont mess with the FWD fuse unless you have to. Period.
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Old 08-15-2005, 03:37 PM   #6
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AHA! Told you it was a stupid question. Like I said, never had a Ru before, so not so much confusing the two types as being completely ignorant of how this AWD system works. That's why you guys are so great. And 777, Of course! I can't believe it didn't dawn on me sooner. Putting a fuse in, would complete a circuit, triggering something electro-mechanical to make the desired change. Duh. (note, here is where the light bulb goes on over authors head). Well, so much for that idea folks. Thanks. Oh, checked the mileage today and getting roughly 26.21 mpg. From what I've read all over the forum, this seems about average. Thanks all.
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Old 08-16-2005, 07:35 AM   #7
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It wasn't a stupid question. That FWD fuse is huge and looming, tempting like a blonde in a bikini when you open the hood.

Glad you got your answer, though. I was curious about that myself, as my wife has a '95 Legacy LS 4EAT.

=S2=
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Old 08-16-2005, 02:35 PM   #8
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awd KILLS you gas millieage....think about how much more power is lost by AWD drivetrain compared with any two-wheel drive system...an RS get 117hp to the ground, a sti gets what like 230whp, where do you think that power comes from. your engine produces it from burning gas, your tranny and differentals turn that power into heat...the power thats turned into heat dose nothing for your car's motion and therefore is completely wasted. you're burning more gas and nothing more than heat from it...bad milleage
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Old 08-16-2005, 03:13 PM   #9
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Josh, I'm no genius (evidenced by my original question), but I see it this way. Heat is caused by friction, friction means resistance, and resistance means that power is being transferred to those rear wheels, but the road and gearing, and weight, and steel are offering resistance causing some power to be lost. However, the same applys to two wheel drive vehicles, just not X's 4. So is some milelage lost due to resistance on an AWD vehicle? Sure. Would I call it bad milelage? No, since I've been driving some form of 4 wheeler since 1986 and when using all four, my mileage only dropped on average of about 2 to 4 mpg on the worst one. It's not like it cuts it in half. But with gas prices being what they are, I was looking to squeeze out another 2 mpg if I could. I think my time would be better spent with new plugs and an air filter. Plus this winter, I wouldn't trade AWD for 5 more mpg! Siper, you're right. It just sits there, teasing you, daring you to do something with it. I hate that. Thanks all.
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Old 08-16-2005, 03:29 PM   #10
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resistance dosen't always mean that power is being transfered to the wheels... it could also mean that things are being driven that dont need to be driven, pure friction caused by excess gears and shafts, like in an AWD car in the summer. although i agree with you about AWD in the winter, gets pretty crappy in iowa in the winter and my little 2 door subie can pass up 4wd trucks stuck in the snow.....wow 86', thats when i was born, i feel really young now....
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Old 08-16-2005, 03:35 PM   #11
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oh yeah, and as a side note, the FWD fuse dosent make your car 100% FWD, it makes it run in the mode that it usually runs in in 3rd and 4th gears in a non-slip situation where as the split is 90% front to 10% rear, so really your gas millege wouldnt improve because the same things are being driven. you might gain something, but you wouldn't notice it really, less power is going to the rear and thats where the most power loss occurs, putting power to the rear. Force x distance= work, but that equation also is true for power loss from friction..any force (in this case friction... which is in fact a force as it is a vecter quanity) over a distance will be more prevalant directly porpotional to how far away it is...
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Old 08-16-2005, 10:00 PM   #12
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^^dude. i said that b4 on your other post

DONT RUN FWD UNLESS YOU HAVE THE SPARE ON!!!
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Old 08-16-2005, 10:25 PM   #13
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i suppose you're talking to me.. just relaying what I have learned here on nasioc
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Old 08-17-2005, 06:59 AM   #14
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I stand firm on my opinion that AWD doesnt "kill" your milage. Sure there are some performance hits, but seeing as how i get an average of 28-30mpg at this point, I cant agree that my milage has been "killed".

I'm getting better milage (3-4mpg more) in my 2.2 AWD than I was in my 1.8 FWD jetta.
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Old 08-17-2005, 12:49 PM   #15
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I am getting 29.67MPG. The only reason to put in the "FWD" fuse is if your using your spare so you don't fry your differentials. The only way to really get rid of the awd drivetrain loss is to remove the AWD drivetrain totally and install a FWD drivetrain. You really won't get that much better performance. If your looking to reduce drivetrain losses, invest in some good lubes.
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Old 08-17-2005, 12:56 PM   #16
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Tha shafts all turn regardless of whether awd is engauged or not so no mileage gain there. Mine seems to get about 25 regardless so I cant complain- but I will anyway.
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Old 08-17-2005, 01:01 PM   #17
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John2, As I said b4, my attention would be better used on new plugs, air cleaner, and now that you mention it, superior lubes. Speaking of which, I got 213k out of my 83 Ranger before there was a cascade failure of my sensors. Engine and tranny were still good. 198k on my 93 Ranger before the clutch failed, engine and tranny still good. i bought the 93 new and due to the experience with my old 83, I started using ProLong lube additive in the 93 immediately. ProLong was supposedly better than Slick 50 and I can't complain; but wonder if there are other lubes out there that can extend life and improve mpg that guys on the forum have used and can vouch for. The idea of the FWD fuse is a dead one in my mind.
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Old 08-17-2005, 01:10 PM   #18
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Quote:
Originally Posted by Koss
John2, As I said b4, my attention would be better used on new plugs, air cleaner, and now that you mention it, superior lubes. Speaking of which, I got 213k out of my 83 Ranger before there was a cascade failure of my sensors. Engine and tranny were still good. 198k on my 93 Ranger before the clutch failed, engine and tranny still good. i bought the 93 new and due to the experience with my old 83, I started using ProLong lube additive in the 93 immediately. ProLong was supposedly better than Slick 50 and I can't complain; but wonder if there are other lubes out there that can extend life and improve mpg that guys on the forum have used and can vouch for. The idea of the FWD fuse is a dead one in my mind.
YAY re: FWD fuse

I personally use that murphys mystery oil stuff and i love it. Every couple months i drop a can of BG 44K (or whatever) in the fuel system..its a really good system cleaner. You can pick it up off ebay pretty cheap. In packs its like $5 a can.

Stay away from the Mobil oil additive. I put it in and it wreaked HAVOK
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Old 08-17-2005, 02:39 PM   #19
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Quote:
Originally Posted by josh...just josh
i suppose you're talking to me.. just relaying what I have learned here on nasioc
noted
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Old 12-05-2012, 09:23 PM   #20
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Where do you even get one of these FWD fuses?
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Old 12-05-2012, 10:53 PM   #21
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Quote:
Originally Posted by Siper2 View Post
It wasn't a stupid question. That FWD fuse is huge and looming, tempting like a blonde in a bikini when you open the hood.

Glad you got your answer, though. I was curious about that myself, as my wife has a '95 Legacy LS 4EAT.

=S2=
There would be no point on the early 4eat in terms of gas mileage even if it was ok. From what I understand all early ones are a 90/10 f/r split until slippage is detected and then it moves to a near 50/50.

The following thread talks about it

http://www.rs25.com/forums/f8/t99075...mada-lite.html
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Old 12-11-2012, 01:02 AM   #22
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I have a 97 Subaru Legacy that I ran with in FWD mode for a month or so and it didn't seem to cause any problems. I was having torque binding problems and was trying to avoid causing damage to the car.
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