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Manual Shifting Auto Gearboxes 

 

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Posted: Sun Aug 07, 2005 10:09 pm 
Tyre Shredder
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I know the gear box's are designed not to knacker their selves or the engine by preventing a down gear at too high a speed but i'm talking like taking it from drive to third doing 800rpm @ 60hmph-1 (or something like that). That kinda thing, the revs don't rise and the speed don't drop, however when i put some throttle on the revs rise up past the revs before to get the same speed (ie 1100rpm @ 60kmph-1). If you get what i'm saying here.

 

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Posted: Mon Aug 08, 2005 9:37 am 
Getting Side Ways
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chr!s wrote:
ive manually shifted my ef for the last 100,000k's and now its on 167,000 and its slips a bit between 3rd to 4th but thats it. its fine though. it got damaged the most towing a camper trailer around australia without a transmission cooler... :D



If you're towing anything over about a tonne, dont use D which is overdrive or you'll burn out your transmission quite easily unless you're on a smooth flat and level high/freeway and you're doing 100km/h or greater to ensure the torque converter clutch is locked up.

If you're doing over 65km/h but under 100km/h and the road isn't level, keep the trans in third which is a 1:1 ratio and keeps the torque converter clutch locked. It will not harm your auto one little bit and you DO NOT need a transmission cooler as it will stress your auto LESS than keeping it in fourth and having hte torque converter slipping and burning itself up.
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Posted: Mon Aug 08, 2005 12:29 pm 
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Bozz wrote:
chr!s wrote:
ive manually shifted my ef for the last 100,000k's and now its on 167,000 and its slips a bit between 3rd to 4th but thats it. its fine though. it got damaged the most towing a camper trailer around australia without a transmission cooler... :D



If you're towing anything over about a tonne, dont use D which is overdrive or you'll burn out your transmission quite easily unless you're on a smooth flat and level high/freeway and you're doing 100km/h or greater to ensure the torque converter clutch is locked up.

If you're doing over 65km/h but under 100km/h and the road isn't level, keep the trans in third which is a 1:1 ratio and keeps the torque converter clutch locked. It will not harm your auto one little bit and you DO NOT need a transmission cooler as it will stress your auto LESS than keeping it in fourth and having hte torque converter slipping and burning itself up.


thanks mate, yeah i kinda wish i knew about it more when i went but we were using 3rd mostly but we were flying most of the day out the back of nsw and queensland (around 120-130) cause the roads are flats and boring... avergaing around 800-1000ks a day... ayres rock was worth it though...
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Posted: Mon Aug 08, 2005 2:36 pm 
Getting Side Ways
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bradders wrote:
I know the gear box's are designed not to knacker their selves or the engine by preventing a down gear at too high a speed but i'm talking like taking it from drive to third doing 800rpm @ 60hmph-1 (or something like that). That kinda thing, the revs don't rise and the speed don't drop, however when i put some throttle on the revs rise up past the revs before to get the same speed (ie 1100rpm @ 60kmph-1). If you get what i'm saying here.


It's below your torque converter stall speed. The box has changed to 3rd but the torque converter wont drive the engine any faster becasue the rpm is too low.

 

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Posted: Mon Aug 08, 2005 2:45 pm 
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been meaning to ask this question, its nice to hear that my car is not going to explode, smart lil EL :)

 

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Posted: Mon Aug 08, 2005 3:46 pm 
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altedxr6 wrote:
when changing down the gears in the auto, say going back to second, if it don't click in straight away, tap the accel pedal .


Ill second that...

Kickdowns are a bit easier on the box than a Forcedown using the shifter...

Nothing much will come of doing downshifts, just make sure that your box is well serviced and you will be fine! ;)

 

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Posted: Tue Aug 09, 2005 3:16 am 
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Yeah but it does'nt drive the engine under any circumstances. do u think that maybe the torque converters wasted or the tranny needs a service? the tranny is way over due, but its one of those i'd want to do, just got a million other things i got to do as well.

 

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Posted: Tue Aug 09, 2005 3:23 am 
Tyre Shredder
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well of course it does when i put the throttle on and the car goes faster but like if the wheels are moving faster than the tranny it won't. if you see what i mean

 

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lukey 2.5" sports exhaust
Chopper 19"x245 mags
pioneer deck, 6"x1.5" Splits (F) and 6" 3-way speakers (R)
Precision response 4x 100w amp and 1000w mono 10" sub
Got so much more to go!
tint, breaks and spoiler next!

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