If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. Registration to this Forum is open to Members of The Stag Owners Club (SOC) and Affiliated Overseas Clubs. Non members with an interest in the Triumph Stag may avail of a 30 day trial membership of the Forum. Details in the FAQ section. Registration is not necessary if you just wish to view the forums. To start viewing messages,
select the forum that you want to visit from the selection below.
I have read that the ZF 4HP22 automatic gearbox can be switched between economy and sport mode. The one in my car is absolutely in economy mode, can I easily put it into sport mode?
I'm not aware of a 'switch' to change from economy to sport on the ex-XJ40 4HP22. Having done the conversion myself and done all the reading there was no mention anywhere. You can make it more zippy by using the lower gears. Select '2' and floor the accelerator and you will be pleasantly surprised at how it gets down the road. But you have to be ready to select '3' or 'D' as speed increases. If the 'Kick-Down' cable is adjusted correctly then flooring the accelerator in any gear will result in the 'box dropping a gear or two and improving acceleration.
Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.
Discovery II > Land Rover Workshop Service and Repair Manuals > AUTOMATIC GEARBOX - ZF4HP22 - 24 | DESCRIPTION AND OPERATION | Operation
The first 2 links are to the same page (Paddocks). As far as I can ascertain, the Sport mode is available on the 4HP24 and requires an ECU to operate it. But I may be wrong
The EH variant of this transmission has some special electronics that enabled the car to have an economy mode or a sport mode. A knob by the gearshift lever enables the driver to change the car’s personality from docile to fire-breathing.
For its time this transmission was very advanced. It was a four-speed automatic transmission in an era when this was highly unusual. It also has a lock-up torque converter. This feature means that,…
I know about using the selector to shift gears - that's how I usually drive in town and on the faster "A" roads up into North Wales. I only use 'D' when on the motorway or a long fast bit of road that needs overdrive.
My complaint about the ZF is that it automatically changes up too soon - way before the top of the power curve and I know from my discarded 2012 Mercedes 'C' class that sport mode makes a big difference.
As far as I know the ZF 4HP22 is fully mechanical/hydraulic, and does not have a sport mode. The later 4HP22EH and 4HP24EH are electronically controlled, and do feature a sport mode and even a manual mode (holding a gear regardless of engine rpm, as used in the Range Rover P38a). Maybe there were some intermediate versions without the full ECU but with an extra valve to allow sportier shifts?
The EH also allows torque converter lockup in 3rd as well as 4th. With a modified ECU it can even lockup in 1st and 2nd. I'm not a fan of autoboxes in general, but a torquey V8 and a ZF 4HP22EH does make for a nice drive.
Filip
Lotus Esprit Turbo SE 'Emma'
Triumph Stag 'Blanche' work in progress
My ZF will hold onto gears to well over 5000rpm for max power and more if I override. Maybe your kickdown cable is not adjusted properly? The faster I want to go the more I push the accelerator, the gearbox acts accordingly.
My modern has sport, paddles and tiptronic, I occasionally use sport for burning of the lights or overtaking, the other modes are a waste of space for me.
I think I need to do some work on the kickdown cable - even with the pedal on the floor it still won't change up later than about 3750rpm in automatic 'D'. Obviously it'll stay in whatever gear I choose when I use the gate, I've just driven home from work and didn't get into 4th at all.
I suppose I was hoping for the Economy/Sport switch so I could leave it in Economy when my wife drives!
I believe Clive Tate was 'experimenting' with the 5 speed box (electronic 5th) and paddles for the Stag but nothing transpired as far as I know.
Might be worth contacting him seeing as he and Lewis pioneered the ZF for the Stag.
I looked into using the 5 speed box but the problem is that almost all of the ZF5 boxes have the bellhousing cast integral to the main casing. There is one variant with a bolt on bellhousing but these seem to be as rare as hen's teeth. - Alan
Comment