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#16
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If you are going to keep the car RWD, go buy an R180 and a pair of rear axles... It'll cost about $500 but it'll be worth it. Also, you are triggering the ABS with burning out the rear wheels only... THe sensors are reading a lock up in the front and not in the rear so the ABS will fire the fronts and effectively the rears as well
Tom |
#17
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I have a spare differential, so I'm gonna beat on this one until it explodes. ...if it explodes. I'm curious to see how long it lasts. It'll probably last longer than I can stand living without AWD.
Initially, it makes sense that the ABS is simply confused, but I don't follow why the ABS would be triggering the rear because of a lockup in the front. I believe it's a four-channel system, so applying brake to the rear would have to be a deliberate action by the ABS. I suppose I can see why it might think more brake in the rear would be appropriate, but I don't believe ABS systems ever add more brake. If that were the case, under normal circumstances any one wheel experiencing a traction loss would cause the ABS to apply more brake to the other three wheels, slowing the car down more than the driver demands given the applied brake pressure. By applying more brake, it also risks further upsetting the balance of the car and possibly locking up the other wheels which are its only reference to vehicle speed. The appropriate response of the ABS upon sensing a locked up condition, is to unlock the locked wheel(s). In my case (doing a brake stand), this should cause the car to roll forward, which it does not do. I'm not sure how obvious that is to the ABS computer however. Then again, the finer points of how ABS systems work isn't my specialty, and it probably varies anyway. I'm hesitant to declare outright that the SVX has a traction control system because I can still think of other possibilities. Perhaps the transmission senses the very high wheel speed and relatively light load, and decides to shift to second gear (I thought I had the selector in first, but in retrospect I'm not sure I did.) The engine didn't rev higher than 4500 RPM. Further tests will entail holding the throttle open a bit longer to see if it shifts back to first or if the ABS decides it's time to roll again. I'll also have to try chocking the front wheels or tying off to avoid using the brakes. (Too bad these things don't have front parking brakes like the old ones do. Those were the most bestest parking brakes ever.) Another possibility is that the LSD clutches need a bit of action before they start working. I know some cars have exotic viscous-coupled, torque-sensing fluid systems and such that only bind up after they've been slipping for a moment, but I recall that the SVX just has an ordinary limited-slip differential. The feel, and especially the noise, is very similar to what I've experienced when climbing snowy hills near the threshold of traction. (That particular symptom disappeared when I hot-wired the transfer clutch to remain locked in a 4WD mode.) It definitely feels like the ABS is doing something, but I'm still puzzled about exactly what it's doing and why. |
#18
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Just unplug the ABS unit under the hood.....you can always plug it back in when you're done with your burn out....
__________________
Huck Subaru Ambassador 92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 88 XT6 AWD 5-Speed "Bride of FrankenWedge" 15 Impreza Premium Sedan 15 Crosstrek XV 5-Speed My 5-Speed "How-To" Write-up 1976 Pontiac Firebird Formula Current Count of Subaru's Owned.... "70" |
#19
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Quote:
We did it 2 years ago for a race. It was a blast and eventually that's the direction I think we'll take.
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British vehicles are my last ditch attempt to keep the nasty Italian thoughts in my mind at bay. So far its working. |
#20
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The ABS .
UberRoo, the ABS is causing the short burnout. When the ABS operates, as it does when you hold the brake on while the back wheels are spinning, the TCU puts the box into 3rd gear, regardless of where the lever is.
Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#21
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Man ...I cant wait to try this
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Eric Rebuilt P/S pump info... http://www.subaru-svx.net/forum/showthread.php?t=50918 If your car wont start info... http://www.subaru-svx.net/forum/show...ighlight=click |
#22
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But then I'm still don't think that accounts for everything; The ABS-like grinding noises, or the fact that first one wheel spins and then the other one spins before they both stop. I also sensed that something was curtailing my performance even during rolling burnouts. I figured it was the transmission shifting, but I didn't have enough space to let it play out completely. Obviously I need to do some experimenting. |
#23
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Quote:
__________________
British vehicles are my last ditch attempt to keep the nasty Italian thoughts in my mind at bay. So far its working. |
#24
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Was it neccasary to drill through the friction plates and insert dowels? wont the top and the bottom friction plates wear out faster?
__________________
Eric Rebuilt P/S pump info... http://www.subaru-svx.net/forum/showthread.php?t=50918 If your car wont start info... http://www.subaru-svx.net/forum/show...ighlight=click |
#25
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No, as inserting the dowels, locked it, so there is no slipping, so the will be no wear on any of the fiction plates in the transfer clutch pack.
__________________
Huck Subaru Ambassador 92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 88 XT6 AWD 5-Speed "Bride of FrankenWedge" 15 Impreza Premium Sedan 15 Crosstrek XV 5-Speed My 5-Speed "How-To" Write-up 1976 Pontiac Firebird Formula Current Count of Subaru's Owned.... "70" |
#26
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If you have pictures of the dowels in the friction plates I would like to see them... Thanks
Tom |
#27
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He has to have drilled through the metal plates, and friction plates, then put dowels trough them to make them one solid unit, so all the power would be transmitted to the rear driveshaft. Next step would be to remove all the front diff parts, to lighten it up some, just leave the outer section of the axles to hold the bearings together.... Sounds like fun (I'm an old Firebird owner, and I miss lighting up the rear tires once in a while )
__________________
Huck Subaru Ambassador 92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 88 XT6 AWD 5-Speed "Bride of FrankenWedge" 15 Impreza Premium Sedan 15 Crosstrek XV 5-Speed My 5-Speed "How-To" Write-up 1976 Pontiac Firebird Formula Current Count of Subaru's Owned.... "70" |
#28
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The only thing you could remove from the front diff is the ring gear... The carrier needs to hold the axles unless you take the axles out and leave the outer CV's in... You would want to leave the pinion gear in because it seals the diff front the tranny
Tom |
#29
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Wouldn't a set of rear axle stubs from a front wheel drive Soob be easier and lighter??
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0 |
#30
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i am not sure the splines are the same...
Tom |
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