Saw that as well. My understanding is that the 1st gen was in the X350, X202 & X103. 2nd gen in the X150, X250 & X351, so yeah need to be careful. BUT if it can work with the 2nd gen then why not the first?

 

I have been having difficulty finding any real technical documentation on ZF's 6HP transmissions. There are a few decent write ups and press releases discussing the Gen 2 transmissions, like smoother shift points, a bit more torque handling, and a few charts. One document stated that the gen 2 6HP26 is now the 6HP28. (2010)

There are many references to the ZF 6HP26 transmission being updated in 2006, and that it is called the gen 2 version.

You would think that with with these transmissions being in cars for over 10 years, there would be a lot more information about them published...

We'll see what PCS says when they get back to me.

 

Have looked thru some docs, and the 6HP28 was introduced with the 5.0 XK in 2010, don't know for the other models, but I assume it was also together with the 5.0 ltr engines.

 

I found a great ZF rebuilt transmission listing online. It lists all the available rebuilt ZF transmission with lots of great P/Ns.

There sure are a lot of variations listed for Jaguars.

http://www.zf.com/na/content/media/e...atalog_pdf.pdf

 

I vaguely recall there may be some tech doc in this site's download area (see stickies) and have you seen this:
http://bmw.tech.officelive.com/Docum...0wilson009.pdf
it's not many pages.

There's a 104-page somewhere (try google) called ZF6HP26-20322431-Repair-Manual.pdf

and some more I'm having trouble putting my hands on at the moment but a useful google search would be the obvious words (ZF 6HP26) followed by
filetype (then a colon) pdf (with no spaces)

which cuts out a LOT of unwanted stuff.

 

It is looking like another dead end....

From PTCS:

Joe,
Russ is out of the country so it took me a little while to get all of the information I needed. As of right now the only version of that transmission we can work with is the BMW. Even after we do expand to that variant of the transmission the controller is designed to run the transmission outside of the original vehicle and is unlikely it will accomplish what you are looking to do.

 

Cambo, thanks for the response,

re: what rpm does the STR shift 1-2 at?
I'm not sure, car is in storage for the winter otherwise I'd check, but come spring I'll datalog through the obd port a WOT run in sport, mode, and see where it shifts at.
I believe it short shifts 2-3 as well, as I recall inadvertently bouncing off the rev limiter once, and I'm sure I didn't wind it up past 6k yet,

I found this post by an 03 STR owner:
"Each time it shifted right at 5500 to 2nd, and right at 5750 to 3rd."
And this one from an 05 STR owner:
"an '05 with Sport button engaged still shifts at 5,500-5,600." 2nd, without a doubt, shifts at redline."
someone comments:
"programmed to shift at 5250 on 1st gear, 5750 on 2nd gear and 5900 at 3rd gear after that it shifts at redline at the remaining gears."

but in that same thread, there is several STR owners claiming after 'reseting the TCM" through a battery disconnect, they were able to force the car to shift at 6k. Permanently... yea...


re: XKR reports to shift 5,900rpm in the 1-2
Does this mean to say that 1-2 5,900rpm, and the 2-3 is at the 6,100 redline in the case of XJR/XKR?
That's still an improvement I'm willing to take if its possible...

Maybe the 05+ cars have 1-2 at 5,900rpm, including the STR/XJR?

If the .dhx files have some model specific identifiers, then I doubt flashing an 03 with an 05 software would work, especially considering the STR cars had a major update in that year.

re: softelectronic flash and install,
Considering the costs and hassle of retrieving the TCM from the transmission, and sending it off for weeks to perform an unproven update... yea not reasonable,

re: PCT TCM2600, last hope?
Like avos pointed out, 1st gen ZF6HP might not be the same as the 2nd gen for which the TCM2600 was developed...

But I guess we will know more when they respond,

Any idea what the TCM2600 install would be like? Do you have to access the mechatronic through the oil pan as well? Or does it interface elsewhere?

Thanks,

 

As you guys hopefully read in my last post, It looks like the TCM2600 wont work for our purposes. I am still trying to see if PCS can help us, but it looks doubtful.

My 2 Mark VIII housings are on their way back to me after having the axle seal openings enlarged slightly to fit special 31 spline axles seals. It took my brother about 2 hours total, while watching the Datona 500. This saved me at least $200. The housings will arrive by Monday, then I will kit the parts and have a local shop assemble the rear end for me. (I am getting lazy in my old age, otherwise I'd put it together myself.) I'd rather focus on my custom half-shaft axle project.

I purchased a rear sub-frame for the 2000 S-type Mark VIII Differential installation. I'll post images as this part of the project comes together.

As it stands now, I will continue with a 6 month plan to put a Mark VIII rear end in the STR, with stock gears, after I get the first one fitted to the 2000 S-Type.

 

Does anyone know if the Land/Range Rover version of the ZF6HP26 uses the same TCM as the Jag? I know the RR Sport uses 3.54:1 rear gears on the supercharged v8 & 3.73:1 on the N/A v8. Wondered if this might be the work-around for the limp-mode problem.

 

I doubt it would be possible to flash the Land Rover file into the Jag TCM, since it was not possible to load the XKR file into the XJR without it bringing up errors.

Just on a side note. I was told recently that the Ford Falcons here in Oz with the ZF 6HP26 need modification in the engine ECU for changing a diff ratio. The TCM tuning is only for changing shift points, shift speeds etc. If someone with a Falcon changes the diff it's only the ECU that needs reprogramming.

So I went round the corner to the local Viezu representative, and they were going to check with the UK if the diff ratio is in the ECU (since Viezu already does ECU-remaps).

But I haven't heard anything back from them, and honestly i've been too busy to chase it up.

Maybe ETG or Eurocharged could give an answer on this, perhaps we have been looking in the wrong place for the diff ratio? Who knows....

 

Well nearly 2 years since I started on this quest, I thought i'd finally cracked it.

I was playing around with the Land Rover and the SDD, and came across the option to change the diff ratio, see below;



BUT, when I tried it with the X350 connected, I couldn't get the same options to come up, it just brings up empty fields...

I don't know if it's a problem with my SDD, or just that it's not possible with the Jag.

Very close, but still not there...

 

Is it in the ICM (cluster)?

The tyre size is/was in there (for some cars, haven't looked for the S-Type, but it is/was a Visteon cluster).

 

Hey Cambo, did you ever get a proper work-around for this?

 

Short answer is yes and I'll update this thread when we've actually done a ratio swap, at the moment it's been tested by reprogramming a car with the original diff fitted and the "right" errors occurred.

I'm out of the country until June, hopefully we'll have an answer by July.

 

Bump...

 

We're ready to do the programming just waiting on the guy with the car now...

 

Bumpity-bump...

 

LOL, same answer as last month. Trying to fix a suitable date & time for three people in two countries ain't always easy...

EDIT

Everyone keep your fingers crossed for this coming Friday.

 

I have a 98 xjr with a 3.58 locking diff swapped. I also have accesd to IDS and an original VCM rotunda. I've been doing the manual bypass starting off in 3rd and shifting to drive once I get going but it's annoying. I picked up a PCS standalone TCM that I'm thinking of installing, but would rather have the stock EGS51 recoded. If there is anything I can do to help let me know.

 

Cambo, I sent you a PM, but then found this thread. Please just update here for all to see if there has been any progress. (I can't find it elsewhere if it has been updated)

Thanks for doing so much work on this! People you don't even know appreciate it!