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Author Topic: torque convertor lock up  (Read 2172 times)

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grifter

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torque convertor lock up
« on: 20 April 2018, 10:37:53 »

On my old senator A, and my current senny B you feel the TC lock about 60 65 does the omega box do the same? I certainly cant feel anything or a noticeable drop in revs. It's 2.6 02 plate i have. I believe this gives a mechanic lock between engine and box.
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Migv6 le Frog Fan

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Re: torque convertor lock up
« Reply #1 on: 20 April 2018, 12:00:41 »

It happens at a lower speed. Usually just under 50mph ime.  :y
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grifter

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Re: torque convertor lock up
« Reply #2 on: 20 April 2018, 13:13:08 »

It happens at a lower speed. Usually just under 50mph ime.  :y

Now you say that i think it is same on senny, about 50. I do get a drop in rpm about then, wasn't sure if it it slotting into 4th and then lock up came a bit later.
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Kevin Wood

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Re: torque convertor lock up
« Reply #3 on: 20 April 2018, 17:39:37 »

Easy way to tell is to move the throttle a little. If the revs respond the torque converter is still in line. If the revs stay related to road speed it's locked up.
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TheBoy

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Re: torque convertor lock up
« Reply #4 on: 20 April 2018, 18:41:22 »

At a light cruise, Omega 3.0/3.2 and 2.5TD lock up at just under 50mph.
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zirk

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Re: torque convertor lock up
« Reply #5 on: 20 April 2018, 23:08:28 »

Or about 130mph if your ragging it.  :-X
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TheBoy

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Re: torque convertor lock up
« Reply #6 on: 21 April 2018, 09:47:33 »

Or about 130mph if your ragging it.  :-X
Which you won't reach in Sport mode on a pre V5 of a GS820 TCM, as it will not go into top, just bounces along the rev limiter at about 128mph.

Apparently. Obviously I wouldn't know such things.
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Bigron

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Re: torque convertor lock up
« Reply #7 on: 21 April 2018, 11:01:00 »

How does torque convertor lock-up work, is it mechanical or electronic?
Also, when I had a Carlton, I thought that it had lock-up on 3rd as well - or am I misremembering?

Ron.
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Kevin Wood

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Re: torque convertor lock up
« Reply #8 on: 21 April 2018, 11:30:03 »

How does torque convertor lock-up work, is it mechanical or electronic?
Also, when I had a Carlton, I thought that it had lock-up on 3rd as well - or am I misremembering?

Ron.

It's both. It's a mechanical clutch that connects the torque converter input shaft to the output. It's hydraulically operated, but the hydraulic fluid is controlled by an electrical valve.

Omegas lock up in 3rd and 4th by default. They will apparently also lock up in 2nd if the transmission gets hot (e.g. when towing) although I've never noticed it happen.
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Bigron

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Re: torque convertor lock up
« Reply #9 on: 21 April 2018, 12:21:03 »

Clever, isn't it!  :y 8)

Ron.
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Dr_Syn

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Re: torque convertor lock up
« Reply #10 on: 21 April 2018, 19:15:06 »

Clever, isn't it!  :y 8)

Ron.

I think it's a cracking gearbox all in all, one of the best slush boxes I've driven after the Mercedes 5G and 7G tronics.  The only thing I'd wished theyd done is made top gear a little taller on the 2.6, part of me is tempted to put a higher ratio diff on for more relaxed cruising.
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Bigron

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Re: torque convertor lock up
« Reply #11 on: 21 April 2018, 19:44:08 »

Yes, that surprised me when I changed my Carlton (2.2) for my first Omega (2.5 PFL) and then my current Omega (2.6FL). The Carlton gave 30 mph per 1000 rpm, the others less so.
When I first drove the Carlton away from the vendor's, I loved the quiet smoothness - looked at the tachometer, "Oh, 3,000 rpm, thet's good".
Looked at the speedo - 90 mph!
Oops!  :-[
My excuse was that I had traded up from a noisy peugeot 305, so I was "driving by ear, officer".......

Ron.
« Last Edit: 21 April 2018, 19:47:04 by Bigron »
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neil74

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Re: torque convertor lock up
« Reply #12 on: 21 April 2018, 21:23:19 »

That reminds me of when I had my old G Reg senator. one day I was driving down a dual carriageway under the limit surprisingly and I thought lets go round the other dawdling grannies and when I glanced down at the speedo it said 107 mph. good job I looked when I did or I might well have got a ban..
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Enceladus

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Re: torque convertor lock up
« Reply #13 on: 22 April 2018, 15:39:00 »

You might get a better idea of whether or not the torque lock-up is working by using cruise control on a clear dual carriageway. The lock should remain engaged going up a gentle incline, the instantaneous fuel consumption will rise. Using the throttle pedal tends to disengage the lock and the revs will jump.
« Last Edit: 22 April 2018, 15:40:40 by Enceladus »
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