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#1
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Too much torque to the rear wheels
I recently replaced my transmission with a subaru rebuilt I got off ebay for $650.00. The tranny shifts great no flares or slipping. But I now have this tremendous amount of power going to my rear wheels. I mean to the point where I'm not pounding the gas but I burn rubber and the car pulls to the left. You got to hang on to control this beast, it's like it's got too much horsepower. Any idea's?
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1996 Black, 134,000 KM, with Custom Stainless from Headers to Stebro, 17" Wheels, Michelin Pilot Sport PS2 225/45/17 Cold Air Intake. Pioneer AVIC D3 GPS/Video/Sound/Sirius/Bluetooth/USB Koni struts/ground control coilovers Stainless steel brake lines K&N filter, custom front grill H.I.D low beams 5000k 35w, H.I.D fog/driving 4500k 35w Clear front and corner lens |
#2
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Is there binding in tight turns?
Put in the FWD fuse, check to see if drive to the rear continues and report the results for further diagnosis.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#3
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weird...I thought the TCU limits the amount of power to the rear wheels to a maximum of 50%.
-Bill
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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 |
#4
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Quote:
Also interesting ---- When the car is travelling on an even surface and in a straight line, the road and forward motion in effect lock the front and rear wheels as if they were connected by a chain or a toothed belt. Torque can be applied to the front wheels with less to the rear because the rear can be partly coasting and be pulled along i.e. driven by the front. In this situation the clutch need not be applied at full pressure and a state of tension can exist between the plates but there will be no real slip. Say 90% torque front, 10% rear. This results in the missing 80% to the rear being provided by the coupling provided by forward motion. When the car enters a corner in these circumstances, and the situation changes, there is surely the foregone conclusion of initial understeer. It will be seen that in a straight line there is no stress on the centre clutch pack.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#5
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Is it possible that the final drive ratio may be mismatched?
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#6
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I was going to try the FWD fuse this morning, except we've gotten nailed by another snow storm. They close the schools and stop the buses but I still have to go to work.
I guess anything is possible with this one, but as far as the tranny goes the transmission shop asked me to get them the part # and serial number of the tranny before they would approve it for my car. It drives real scary in the snow with all that torque to the rear, I'm in for a fun drive to the office...60km of terror awaits me.
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1996 Black, 134,000 KM, with Custom Stainless from Headers to Stebro, 17" Wheels, Michelin Pilot Sport PS2 225/45/17 Cold Air Intake. Pioneer AVIC D3 GPS/Video/Sound/Sirius/Bluetooth/USB Koni struts/ground control coilovers Stainless steel brake lines K&N filter, custom front grill H.I.D low beams 5000k 35w, H.I.D fog/driving 4500k 35w Clear front and corner lens |
#7
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I, too, thought the "limit" to the rear...
...was 50%.
Maybe "effective" traction is the keyword in Trevor's example of no traction in the front? Otherwise you would be driving what was essentially a rear wheel drive car that would shift traction to the fronts like a BMW? Cheers!
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' 92 SVX @ 185K ' 91 420SEL @ 223K! ' 88 420SEL I. @ 178K (what a buy!) ' 87 F250 @ 180K ' 93 ZX-11D @ 29K ' 93 SC400 @ 93K 2001 Valkyrie Interstate @ 6.6K (Brynhild) Y2K NightHawk 250 @ 1,500 miles ' 88 420SEL II. @ 208K '85 F150 @ 135K |
#8
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bump, i've been watching this thread eagerly awaiting a final determination. Any progress?
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Joshua 92 Ls-L pearlie 73,000 miles |
#9
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Just a wild guess but it if the transmission is indeed correct the only other possibility is that the front half-shafts were installed wrong way round. Difficult but not impossible.
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#10
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it could also be that your old transmission had a bad transfer clutch and your used to driving the car in fwd, just to throw another idea on the table
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1991 xt6 eg33? 1993 gc track car |
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