10-26-2009, 09:55 PM
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#161 (permalink)
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eco....something or other
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Huh?????
what buttons??? what?
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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10-26-2009, 09:58 PM
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#162 (permalink)
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Moderate your Moderation.
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You said "thanks"..
If you look at the bottom of anyone's post, you'll see a blue button right next to the green buttons at the bottom right. If you click it, it leaves a note on the post that you've said "thank you" for the information contained within. Try it!
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10-26-2009, 10:25 PM
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#163 (permalink)
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eco....something or other
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I thought you were talking about buttons on the dash.....
Hahaha:d
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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10-26-2009, 10:32 PM
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#164 (permalink)
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Depends on the Day
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Quote:
Originally Posted by orange4boy
Exactly the opposite is true. The TCC lockup reduces heat build up in an auto transmission. Most of the heat generated is from fluid friction in the TC. Lock it up and the TC is disabled, eliminating all that fluid friction.
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Excellent observation! This makes perfect sense (and is a relief). When you hear of overheating transmissions, it's generally from pulling a hill or trailer/load -- the TC unlocks and the torque is, well, converted (into heat).
ATF looks to still be under pressure to activate the lockup piston, but the pressure is designed to operate at extended periods (highway cruise). My guess is that driveability / power demand is quick to disable it.
Formula -- good point as well. I may expose a portion of the ATF fins in the rad block to prevent abnormal heat.
I'm wondering if there's a quick way to monitor ATF temps -- like a sensor on the dipstick or something...
If this works, it will solve a long-time issue of cable adjustment mishaps and ECUs working against me 
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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10-26-2009, 10:35 PM
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#165 (permalink)
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eco....something or other
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temp probe on multimeter?????Mine only reads in Celcius.....nt
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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10-26-2009, 10:39 PM
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#166 (permalink)
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Master EcoModder
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Quote:
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now I am not so sure....I have been wondering if downshifting to the next lower gear would be better than just unlocking the TCC and getting a little more torque? If the fuel used would be the same then I would leave it locked...just wondering.
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In most cases, yes, if you loose too much speed or can't accelerate in the gear you are in just drop into the lower gear and you will be using less gas than unlocking. |
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10-26-2009, 10:42 PM
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#167 (permalink)
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eco....something or other
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Location: Colfax, WI
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AWSOME!!!!! nt
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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10-26-2009, 11:06 PM
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#168 (permalink)
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Moderate your Moderation.
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Location: Troy, Pa.
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Quote:
Originally Posted by RH77
Excellent observation! This makes perfect sense (and is a relief). When you hear of overheating transmissions, it's generally from pulling a hill or trailer/load -- the TC unlocks and the torque is, well, converted (into heat).
ATF looks to still be under pressure to activate the lockup piston, but the pressure is designed to operate at extended periods (highway cruise). My guess is that driveability / power demand is quick to disable it.
Formula -- good point as well. I may expose a portion of the ATF fins in the rad block to prevent abnormal heat.
I'm wondering if there's a quick way to monitor ATF temps -- like a sensor on the dipstick or something...
If this works, it will solve a long-time issue of cable adjustment mishaps and ECUs working against me
RH77 |
To monitor ATF temps, you can get any oil-temp gauge, and install the probe through the pan with sealant. They usually screw in, and you can just put a rubber washer on either side with a nut on the inside to keep it from leaking.
That will give you pan temps, which are the best temps to read.
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10-27-2009, 01:43 AM
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#169 (permalink)
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EcoModding Apprentice
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So if its such a good idea, why does a ford pickup EAT its transmission if you don't turn off the lockup when trailering? Or maybe its Lockup + overdrive? Hmm.
Never dissected this one before, all my cars have had manual transmissions,
only the company cars had autos and I didn't really care about them like my own...
Need to rent a truck and play around for a day.
Dave
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If it has a motor its worth playing with.......
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10-27-2009, 01:51 AM
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#170 (permalink)
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Moderate your Moderation.
Join Date: Nov 2008
Location: Troy, Pa.
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Quote:
Originally Posted by dwtaylorpdx
So if its such a good idea, why does a ford pickup EAT its transmission if you don't turn off the lockup when trailering? Or maybe its Lockup + overdrive? Hmm.
Never dissected this one before, all my cars have had manual transmissions,
only the company cars had autos and I didn't really care about them like my own...
Need to rent a truck and play around for a day.
Dave
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Dodges do this as well. It's a combination of crappy internals  and constant shifting between OD and high gears. Shifting means the clutches create heat due to friction and fluid shear.
I've never understood why they disable TC lock if you're not in OD, though. Makes no real sense, other than the extra weight (load) on the TCC might cause premature failure, if you're the typical driver.
I haul stuff around with 4 cylinders that most people "need" a V8 for, so I'm probably partial to non-idiocy, moreso than most.
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