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#91
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Forgive my ignorance, but what does the torque converter locking up actually do, and what are the negative repercussions of it not locking up?
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1992 LSL Pearlie: 108k, 15min/$15 mod, Alternator wiring "upgrade," Power Mode switch, K&N drop-in, 4500k 35w low-beam HIDs, 3000k 35w fog HIDs, lots more planned (pending funds, of course)- 4.44 5spd being at the top of the list. "We laugh at honour and are shocked to find traitors in our midst." -C.S. Lewis |
#92
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The "slipping" allows the engine to operate at an rpm range where it is producing more power. Slipping is the wrong term for this but I can't think of a better way to explain it. The "locking" prevents the engine from revving higher than needed for a given road speed. Lockup reduces your engine rpm about 200 or 300 for the same road speed. Lowers the amount of heat produced by the torque converter when locked up. Let's say you are doing 60mph. With the torque converter locked you are turning 2000rpm. If you try to accelerate the engine will be mated to the tranny and the engine rpm will only increase in a direct relation to the road speed. To get to 75mph you will steadily increase rpm from 2000 to 2500. Same situation, torque converter unlocked. You press the gas pedal the same amount, the rpm goes from 2000 to 3000 and stays at 3000 until you reach 75mph, at which point you let off the gas pedal enough for you to stay at a steady 75mph, and the rpm drops to 2500.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. Last edited by immortal_suby; 03-13-2008 at 07:30 PM. |
#93
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That makes sense. Does one accelerate better than another, or does it simply allow for less wear on the spinning bits?
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1992 LSL Pearlie: 108k, 15min/$15 mod, Alternator wiring "upgrade," Power Mode switch, K&N drop-in, 4500k 35w low-beam HIDs, 3000k 35w fog HIDs, lots more planned (pending funds, of course)- 4.44 5spd being at the top of the list. "We laugh at honour and are shocked to find traitors in our midst." -C.S. Lewis |
#94
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Depends on what range of acceleration you mean
Highway cruising speed acceleration - just going from 60 to 70mph but in no big hurry to get there fast - you are better off with a locked torque converter. No excess heat is being produced (efficiency lost). The engine has plenty of torque to speed you up fairly quickly without unlocking the converter. Stomping it to accelerate quickly - you have no choice - the torque converter will unlock and the tranny will most likely grab a lower gear to make the most of the engine's peak power range. Accelerating from a stop - you have no choice- the converter will be unlocked as you go through the gears and until you reach a steady speed over ~50mph.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. Last edited by immortal_suby; 03-13-2008 at 07:31 PM. |
#95
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better yet, read this - it explains it alot better than I ever could.
http://en.wikipedia.org/wiki/Torque_converter
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#96
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I finished my first tank of gas on full time power mode today. 20.2 mpg I normally average between 19-21 on my regular commute. I was very surprised to see that the mileage hasn't gone down. Especially since I seem to keep my foot in it alot more with the power mode.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#97
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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 |
#98
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=1
Well, it makes a change from all the plus 1s, doesn't it? I measured mine over many, many tanks full of fuel. The worst I have ever seen was a 2 mpg difference, the average was 1 mpg worse off, and both of these could probably be attributed to driving with a bit more verve, because the car would actually drive better now. However, I will add a minor note of caution. Most of my driving would be 50/50 in terms of driving in D4 or driving using gear changes and stops. I suspect, in fact I am certain, that if you do a 500 mile or a 1000 mile drive by motorway [freeway] in 4 range, the benefit of being able to switch Power mode off and lock up the torque converter will gain 2 mpg to 4 mpg on such a long drive. For day to day driving the cost or the difference is so negligible it is hard to calculate with accuracy. Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
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