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Old 11-26-2000, 08:44 PM   #1
glenstiles
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Member#: 2827
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Location: Woodland, CA
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2002 WRX wagon
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Question Resistor mod?

Resistor mod, you know, disconnecting the plug on that little gray thing by the battery. Anyone still running this??- after talking a little on the powertrain forum about it, decided to try it out one more time. I like it, especially the 2-3 shift feels much better. Just can't figure out if its better, worse, or makes no difference in the longevity of the tranny. Got only one response on the yahoo board- any comments, tips, suggestions?

Glen
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Old 11-27-2000, 06:53 AM   #2
Pski
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Greetings,

What is the resistor modification? What benefit does it afford?

Pski
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Old 11-27-2000, 07:24 AM   #3
immortal_suby
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2013 GBS BRZ Limited 6MT

Post

I have been running it for quite a long time and I love it. Definitely shifts harder and also leaves out some of the indecisiveness of the tranny

The mod removes a resistor for duty solenoid A of the tranny - with the resistor in place, line pressure is lowered during shifts so that the shift is smoother. removing the resistor will cause the tranny to shift at full line pressure, meaning quicker, harder shifts. It will also flash a trouble code each time you start the car.

I have run it like this from around 102k to presently 122k miles with no problems
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Old 11-27-2000, 10:15 AM   #4
glenstiles
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Thanks for the response. Anyone else? I may leave the resistor unconnected for an extended period- 20,000 miles or so with no adverse effects is pretty good.


Glen
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Old 11-27-2000, 01:31 PM   #5
kastle
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Chapter/Region: SWIC
Location: Phoenix, AZ
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1999 Outback Sport
Steel Blue Mica

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anyone have the instructions on how to do this? I assume that this is not the same as the crush mod?
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Old 11-27-2000, 01:57 PM   #6
CRZ_MSL
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Remove the battery from your SVX. Mounted on the engine bay wall you will see a large ceramic resistor with a gray connector. Removing the connector disables duty solenoid "A" which allows for shifting so smooth you can barely feel it.

Changing the value of the resistor changes how soft the transmission shifts.

AFAIK firm, crisp shifts are better for your transmission. Smooth shifting transmissions are what the target market of the SVX was thought to want.

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Old 11-27-2000, 02:16 PM   #7
kastle
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thanks, I might just try this tonight...
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Old 11-27-2000, 03:07 PM   #8
Never2phat
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Just a thought........

My tranny apparently ran way too hot on the way to the Burlington Vermont meet and now shifts very poorly. No gear slipping but definetely very sluggish. Especially noe that it is getting alot colder. I'm guessing it to be that the four rings in the tranny were overheated and shrunk to a useless size when they cooled allowing fluid to now pass by them and effectively lowering my ATF pressure. If I disconnect the resistor will it increase my ATF fluid pressure any? Does anyone know if it will help me to shift better by essentially upping the ATF pressure to atleast what it is normally supposed to be during shifts? I figure I might as well give it a try because my tranny is going to need overhauling soon anyway Any thoughts?

B.C.
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Old 11-27-2000, 03:31 PM   #9
CRZ_MSL
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Lightbulb

Too hot? In Vermont? In the fall/winter?

It depends on where the rings are in position to the flow inlet where the pressure is coming in. If you are certain that a new transmission is in your future then I say to try it.

For those of you who were too affected by triptophan over this holiday weekend to get to it, please install a transmission cooler, if not now, definitely by next spring!

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Old 11-27-2000, 03:54 PM   #10
Never2phat
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Yes I realize it was not hot on the way to Vermont but I did make the trip in one shot. It was unusually warm and I made the trip in 8+ hours of constant driving. When I arrived I was having extreme gear noise the whole time. I actually ended up being Blondemans co-pilot for alot of the time we were there. On the way up Mt. Philo I had a couple of times were the car didn't want to take gear. On a slight upslant the car would not hold it's ground(like it normally would on such a lil' slant) and kept drifting backwards. When I gave it gas it was reluctant to go. CRZ MSL, Do you think it could be something else that is wrong? I thought it sounded just like the symptoms of the rings being shot. Low ATF pressure = reluctant and sluggish shifting with gear noise(wining mechanical noise)

B.C.
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Old 11-27-2000, 05:01 PM   #11
glenstiles
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Never2phat,

Might as well try the resistor mod, sounds like your're due for tranny work soon anyways, I don't think it could hurt at this point, and the resistor mod is very easily reversible...

Glen
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Old 11-27-2000, 05:11 PM   #12
Never2phat
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That's kinda what I thought. If already down for the count it can't really hurt anymore. I guess this will give me something to do tomorrow. I'll let you guyz know how it feels,with a crippled tranny, when I get it done. Hopefully it will give me more time to save $$$ for the overhaul. If not I'll have to let the SVX sit for a while in my back yard and driver my moms piece o' junk Chevy Cavalier(sp?).

B.C.
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Old 11-27-2000, 05:23 PM   #13
CRZ_MSL
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AFAIK an overheated transmission will change the color of the transmission fluid from a pulchritudinous pink to a bogus brown.

What color is your fluid? Maybe you just need a new tourqe converter (I'm crossing my fingers for you!)
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Old 11-27-2000, 05:32 PM   #14
richeich
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2001 Impreza 2.5RS
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Question

Have you changed your ATF since then? I would at least give that a shot. My daughter's Taurus was shifting sluggish enough to catch my attention. I checked the fluid and found it to be low and burned. Had it flushed, filter changed, and filled, and now it's okay. What kind of fluid are you running? I would strongly recommend Synthetic ATF. Although if it's still messed up after changing to synthetic, it'd be a pretty big waste of money.

Good Luck-
Rich
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Old 11-27-2000, 10:05 PM   #15
vkykam
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92 SVX
Pearl White

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For those of you that are happy with your resistor mod, would anyone be interested in selling their resistor?

Mine's busted, and my regular passenger (as in the boss of my life...) finds the shift a little too harsh.

VK
92 Pearl, 154k
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Old 11-27-2000, 10:20 PM   #16
richeich
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The Legacys use the same resistor, it's just mounted on the passenger side strut tower, facing the front of the car. The early 90's models had the same connector (my '90 does). The later ones have a different connector, but you can splice it if you want. It's still the same resistance. Maybe you can find one in a wrecked Legacy and get it for $2 or something like that.

Rich
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Old 11-28-2000, 12:16 AM   #17
CRZ_MSL
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Any idea how to replace the resistor with a rheostat? I want to do this mod, bu first I have to find a suitable place to locate the enable/disable switch.
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Old 11-28-2000, 08:31 AM   #18
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If you know the value of the resistor you can get one from Radio Shack.
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Old 11-28-2000, 06:37 PM   #19
glenstiles
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Never2phat,
Was wondering if the resistor mod helped or not. Also, has anyone experimented with different values for the resistor?

Glen
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Old 11-28-2000, 08:12 PM   #20
vkykam
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Rich,

I'd love to find one off a Legacy, but whenever I call a wrecker around this area and ask for the part, they all sound like they're wondering what drug I was on.

As for the suggestion about finding any resistor that matches the resistance, would it work?

VK
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Old 11-28-2000, 10:33 PM   #21
CRZ_MSL
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Only if it has the same rating as the resistor you are replacing.
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Old 11-29-2000, 12:20 AM   #22
Never2phat
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My fluid(regular run of the mill fluid) is kinda new. I'll explain.......I believe in the theory if the tranny hasn't been flushed regularly(I'm 2nd owner and do not know what the 1st did) it shouldn't be done because it might dislodge 'gunk' that is in there and destroy the tranny all the quicker. I did have the fluid drained and then topped off twice since the Vermont meet to get as much as the old fluid out. While the fluid looked okay it did help a lil'. I suppose I could drain it a couple more times to make sure it is not just the fluid. I figure if I can save enough $$$ I will take my SVX to Level 10 and let them do their magic because they are only 3 hours away. In the meantime I'm heading out right now to perform the resistor mod. I'll let you know if it helps

B.C.
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Old 11-29-2000, 03:36 AM   #23
richeich
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Hey VK- that may be the kind of thing you'll have to go find yourself. I wouldn't expect the junkyard guys to know what it is. Do they let you go out and dig through the cars yourself, or is that no allowed anymore? That used to be the best part! I'd just try to find a junkyard that has some Legacys, and then go out and look for myself.

I don't have the service manuals anymore, but I seem to recall it's got a rather wide resistance range, say anywhere from 6-15 ohms is okay. All the ones I've measured (4 of them) have been 10.5 ohms. Something from Radio Shack would have to be heavy duty. I don't think a 1/2 watt resistor would last too long!

Rich
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Old 11-29-2000, 05:12 PM   #24
glenstiles
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VK, dunno if this helps, but the radio shack catalog lists a 8 ohm resistor rated at 20 watts. part 271-120, $1.49. "useful in high-power audio hookups and projects." Might work, worth a shot, eh?

Glen
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Old 11-29-2000, 05:29 PM   #25
Never2phat
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Thumbs up

Glenstiles,

A world of difference. The fact that the 'resistor mod' made such a huge difference leads me to think that my tranny problem has to be ATF pressure related. It shifts soooooo much better now that I did it. Much firmer/quicker shifts in comparison than the stock set-up......I like it I actually like it alot compared to the mushy, need to give it more gas to get the tranny to shift, shifts that I have had since Burlington Vermont. The only draw back I have come across is that in in-town driving it can be a lil' jerky when shifting. Considering that I drive 90% highway I'm not gonna let that bother me though. I just need to save my $$$ now, hope the tranny holds out, and get her fixed as quickly as possible

B.C.
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