Td5 auto questions

**Markf** · 26th February 2020, 11:31 PM

Originally Posted by discorevy

Standard torque converter stall speed is 2800 rpm , lock up is determined by load, throttle position, temp ( must be 59 degrees or above ) drive time,and revs.
Of the dozens I have driven , including my own , I have never had lock up in 2nd !.
Unlock with trailing throttle is governed by revs ( 1500 ), so if you want to keep it in lockup from say a 90 zone to a 70 zone , don't take your foot off the throttle, just ease it back so it doesn't come out of lock up, then gently accelerate back up to speed .
Not sure what you mean by " wind and limb"

Thanks everyone - it's cleared up a few things for me. I'll go for a bit of a drive tomorrow and really take note of what it's doing. The auto specialist reckons that it's behaving as it should so I'm happy with that. It'll be interesting to see how it goes over the Adelaide Hills in April with nearly two tonnes of camper. When I asked the auto specialist about that he told me to put it in 3 sport mode and let it work itself out but others have said to just leave it in normal mode 4th and just let it work it all out.

Sound in wind and limb is an expression borrowed from English horse racing meaning completely healthy in all respects.

**V8Ian** · 27th February 2020, 05:08 AM

Towing advice is not to overheat the box. Select third gear below 80 kph.

**PhilipA** · 27th February 2020, 08:35 AM

AFAIR the Adelaide Hills are steep.
If you have an EGT gauge drive by that, and keep under 700c but towinG 2 tonnes I would be in second over 3000rpm or third locked if not so steep.
I was surprised recently when I towed my daughters Campomatic which my guess weighs about 1400kg up Mona Vale Hill.
Towing my 900 kg Campomatic. I could easily tow 3 locked at under 700 but the EGTs shot up very quickly. I had to drop to 2nd to keep EGTs down even though plenty of power in 3rd.

IMHO EGTs can rise very quickly while towinG and the incidence of warped exhaust manifolds supports this.

Regards PhilipA

**Markf** · 27th February 2020, 10:01 AM

Originally Posted by PhilipA

AFAIR the Adelaide Hills are steep.
If you have an EGT gauge drive by that, and keep under 700c but towinG 2 tonnes I would be in second over 3000rpm or third locked if not so steep.

In my manual that was my usual tactic whether towing or not. If it was sufficiently steep, somewhere between 3000 and 3500 the car seemed to feel less "stressed" than it did in the next gear up at about 2500.

I don't have an EGT guage - I just rely on keeping the revs up around 3 to 3.5k RPM if the going bets a bit hard. I'm more concerned with keeping the gearbox as cool as possible even though it has a bigger cooler than standard. It seems that the same high revs tactic is the go.

**Tins** · 27th February 2020, 12:05 PM

Originally Posted by V8Ian

Towing advice is not to overheat the box. Select third gear below 80 kph.

That's what killed mine. A seperate cooler would be a smart investment.

**V8Ian** · 27th February 2020, 12:37 PM

Originally Posted by johntins

That's what killed mine. A seperate cooler would be a smart investment.

Thats a bit ambiguous John. What killed the box, overheating or locking in 3rd?

**Pedro_The_Swift** · 27th February 2020, 12:59 PM

I'll bet you a six pack it was overheating the box!!

**Tombie** · 27th February 2020, 02:25 PM

Originally Posted by johntins

That's what killed mine. A seperate cooler would be a smart investment.

A D2 has a seperate cooler...

**Tins** · 27th February 2020, 04:57 PM

Originally Posted by Tombie

A D2 has a seperate cooler...

OK, a bigger seperate cooler

. Also, a sump extension. The things don't hold enough oil IMO. The ZF 4HP22 was intended for cars like the 5 or 7 series Beemers of the time.

I killed mine doing this
IMG_7636.jpg
for over 1000ks at highway speeds at high ambients. It didn't die straight away, but it began going into limp home more and more, and one day just stopped.

16PMark · 27th February 2020, 05:06 PM

Originally Posted by johntins

OK, a bigger seperate cooler

. Also, a sump extension. The things don't hold enough oil IMO. The ZF 4HP22 was intended for cars like the 5 or 7 series Beemers of the time.

I killed mine doing this
IMG_7636.jpg
for over 1000ks at highway speeds at high ambients. It didn't die straight away, but it began going into limp home more and more, and one day just stopped.

I'd suggest your tranny wasn't being maintained correctly, if you believe that's what's finally killed it....
Just saying......

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