trying to improve towing performance of 3l di auto

[GeeYou8]

What revs does a manual ZD30 sit on at 110 kph ?

Ok 100 km/h is max for towing here in WA, 100 on the GPS is 105 on the dial from memory 2700 rpm in 4th (CRD).
110 on the GPS is 2700 rpm in 5th (CRD).
110 on GPS is 3000 rpm in 5th (DI).
Graham

[threedogs]

Ok so what revs are you pulling in a ZD30 manual @ 100 kph
My auto pulls 2200 @ 100kph I feel thats a tad weak for towing
other than dead flat towing,
I think mine will go to 2400 rpm with the OD off @ 100kph

[threedogs]

Ok 100 km/h is max for towing here in WA, 100 on the GPS is 105 on the dial from memory 2700 rpm in 4th (CRD).
110 on the GPS is 2700 rpm in 5th (CRD).
110 on GPS is 3000 rpm in 5th (DI).
Graham

That doesn't sound right to me unless they are from a manual patrol
110 from 5th in a Di sounds wrong too

Going up the Murray sitting on 110Kph cant for the life of me remember see any of those numbers
Will be going again soon when Roofys on the road so I'll take more notice then

[the evil twin]

Speed versus RPM comparison between different vehicles is problematic unless the tyre size is also known.
1 inch diameter nominal (nominal as hardly any tyre dia are what the manuf say) will give as much as 4 KPH and 200 RPM

[threedogs]

I understand my best options are to fit std 265 tyres, But I dont always go with my best options lol
Most here would run 285s and Im hoping I can get RPMs that way

[threedogs]

We have had the patrol for 3 years now as the tug for our caravan.
It is not a light van at 2400kg inc towball mass.
We are slowly leaning the peculiarities of the automatic transmission.
As most would be aware it 'hunts' constantly with overdrive on.
Also locks and unlocks constantly in 3rd with o,drive switch on (even though it is not overdrive) but stays locked better in 3rd with o-drive off.
Up a more than a modest hill i shift the lever back in 2 and stays locked even under acceleration.
So when we are towing we usually keep overdrive off and stay in 3, locked if possible. But this means higher engine revs and more noise especially over long trips.
On fairly level terrain i can usually keep the transmission locked in overdrive until i cant maintain speed above 77 to 80 ks.
I dont think there would be a large difference in the economy of towing locked in 4th or locked in 3rd as obviously the engine (and trans) has to work harder in 4th.
But which is better in the long run for the motor and transmission?
Do torque lockers make a discerable saving in diesel due to lower engine revs, longlivity of transmission oil and transmission itself due to cooler temperature of the transmission fluid?
Any comments, advice or personal experiences both positive or negative would be appreciated.
I plan having a transmission oil temperature gauge installed soon, so any advice along this line would also be appreciated
Cheers
Peter

Back to basics ,,,Peter what tyre size do you run?

[4bye4]

Hey Peter, we are going away with the club to Denmark over Easter. My vehicle is similar to yours, although my trailer is not as heavy as your van. i will take some notice of RPM in different gears and also with OD on/off and try and give you some feedback next week. Cheers Tony.

[paulyg]

My ZD30 DI auto with 285 tyres, OD of = 3000 rpm at 100kmh.

[watto1416]

Threedogs, my daughter has the patrol, when i get it back i will post, but quite certain standard size. Paulg at 90 k i think around 2900 unlocked, about 2700 locked n in 3rd with the o-drive button off. If i can lock in overdrive at 90 the revs come down to about 2300 i think, but dont take that as gospel! Thought 2300 would be a good range to be in for torque?
Cheers

[watto1416]

Finally have the patrol home,tyres are 265/75 R16.
My mechanic has decided he doesn't wish to put in the auto trans fliud temp gauge as he has never done one and not comfortable with doing it. So has someone any recommendations for the installation of above and also a EGT gauge?
Cheers