SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
#1
|
|||
|
|||
WTB Dropping Resistor
So here's the deal... I've been having issues with my 4.44 tranny ever since day 1, and I recently took it to a tranny shop and we discussed the possibility of electrical problems. I called my local Subaru dealership and they told me that the SVX and the Legacy dropping resistors are different... only trouble is, they can't order the part unless they have the VIN from the donor car. To simplify things, I thought I'd just ask if anyone has a dropping resistor from a pre - 9/97 legacy that I could buy and see what difference it makes? If not, I'm going to have to go junkyard hunting.
Thanks, Isaiah |
#2
|
||||
|
||||
Re: WTB Dropping Resistor
__________________
Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k |
#3
|
||||
|
||||
Re: WTB Dropping Resistor
Quote:
Custom Dropping Resistor Mod The Solenoid A (dropping) resistor controls the line pressure in the transmission.* By adjusting the resistance, we can "firm up" your shifts.* NOTE:* Core charge applies. The actual and proper function of the resistor is as Follows:- THE SVX DROPPING RESISTOR CIRCUIT. It will be apparent that the sudden on off pulse width modulated duty to which solenoid valve “A” is subject, tends to cause what could be called a hammering of the valve seat, even though this is largely reduced/damped by the controlled fluid flow. The dropping resistor circuit introduces a second series of current pulses, applied in parallel with the control signal. These pulses are applied across the off cycles, so as to check the travel of the armature as it reaches the closed position, thus reducing both shock and noise. These secondary parallel signals in effect, mean that during the closing period the voltage does not fall completely to zero, so as to reduce a closing shock. This second series of pulses must be at a lower level than the control signal, hence the dropping resistor. A resistor with a high current rating is required, which could not be mounted within the TCU enclosure. It will be appreciated that increasing the resistance in the circuit, or opening the circuit by omitting the dropping resistor, has two outcomes. Firstly the voltage during the closed time becomes zero, thus increasing the line pressure and making shifts more abrupt. Secondly, as an undesirable issue, shock loads applied to the valve are increased. The SVX resistor should measure between 9 and 15 ohms to be within specifications, and is usually very close to 12 ohms. N.B. Some time ago a member posted a very good set of instructions covering the repair of the resistor module, but I can not find this within the how too section. You may be lucky with a search.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#4
|
||||
|
||||
Re: WTB Dropping Resistor
Radio Shack FTW!
-Bill
__________________
Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#5
|
|||
|
|||
Re: WTB Dropping Resistor
Quote:
I may have one from a '91 or '93 Legacy, if it'll work, and I'm 'just up the road' in CDA. I've been looking @ getting that 'custom resistor' but if they're different between the SVX and Legacy I may wait for your results. Let me know if you're interested. thanks, TD |
|
|