Dash/console transition

Console-to-dash transition

The center console over the tunnel transitions into the dash with a radio face plate that is angled back about 18° from perpendicular, followed by a middle tray that separates the top gauge cluster wood facia.

The tray and top facia have black crash roll bumpers so it is difficult to see that the dash top is actually offset back an inch or so from the bottom radio face plate. This offset will need to be accommodated or modified in the final dash design.

 

Electronic shifting

The 4-speed SuperMatic 4L65-E transmission (mated to the LS3 engine) that we plan to install creates some opportunities with regard to the shifter assembly.

Black XJ6 shifter assembly with T-handle

The XJ6 shifter has several drawbacks: 1) it’s ugly enough to preempt any worth preserving discussion; 2) gear selection is only mechanically driven by cable so some electronic functionality can’t be used like optional manual gear changing that requires up/+ and down/- lever slots; 3) the gear 1/2 selector is obsolete for electronic transmissions; and 4) the shift lever conflicts with the radio (entertainment unit) location.

Adding insult to injury are two useless flanking flip-up ashtrays, a cigar[ette] lighter, and a scruffy hot lighter indicator. There must be a better solution.

Performance enhancement

The notion that an automatic transmission could also behave like a manual shift emerged out of high performance experimentation about twenty years ago. Early systems were complicated — partly electronic, partly mechanical — and expensive.

With the advent of full electronic transmission control units (TCU), manual shift emulation became entirely software driven and costs dropped quickly; as a result, most premium cars now offer manual paddles or dedicated +/- slots. Since we plan to install a period-correct Jaguar style steering wheel, shift paddles may be difficult to install as well as esthetically inappropriate; to use manual mode, we’ll need a shifter with dedicated +/- slots or push button activation.

The TCU also allows the creation of “modes” based on different shift parameters in various combinations for winter/snow (1st gear lockout to avoid slipping wheels), sport/performance (delayed shifting to enhance acceleration), or dyno testing. The 4L65-E TCU is completely programmable via a laptop computer plug-in, so customized modes are possible. Not just engines are electronically tuned these days — transmissions are as well!

Shift lever fitment

Electronic control opens up a new vista regarding shift lever fitment because mechanical operations can be separated from digital control.

Most automatic shifters are about 8″ in height divided between the driver’s lever/knob and the mechanical control linkage needed to operate the hydraulics of the transmission. Electronic transmissions still require a physical cable or rod connection to change from park, reverse, neural, and drive (PRND) locations.

XJ6 shifter requires 4″ for mechanical linkages

The “business end” of the shifter, about 4″, must be hidden by either the console or a combination of the console and a raised mount. Older style interiors typically used a raised mount shifter that kept the tunnel cover console low. The Jaguar XJ6, for example, has a raised 1.5″ platform for the shifter.

Unless the height of the entire tunnel console is raised up, space is limited between the console top and the curved tunnel of the chassis. With the popularity of flush mount shifters, the consequence is that center consoles tend to be several inches higher in modern cars compared to the 1960-70s. Sort of like chasing ones tail …
  flush shifter ➜
    need 4″ clearance for shift lever operation ➜
      higher console ➜
        won’t fit XJ6 ➜
          pedestal shifter ➜
            but want flush shifter ➜ now what?

Jaguar pedestal shifter with raised 1.5″ mount and 4″ lever arm

Around 2012 a completely new shift design, not without controversy, began to appear in a few cars: a digital shifter that completely eliminates the traditional physical lever mechanism. This saves some space below the console surface because the shift commands can be separated from the required hydraulic cable/rod manipulations. This separation is enough to give the XJ6 a flush-mount alternative.

Ford Fusion rotary shifter

With the transmission “liberated” as a fully electronic device, some interesting safety features can be built in with software (or physical wiring); in an attempt to counter expected criticism, Ford proudly markets this as “Return To Park” (sounds like a sequel to a DNA-sequenced creature movie).

An electronic shifter can trigger “park” whenever 1) the ignition is shut off, 2) the handbrake is set, or 3) the driver seat belt is unfastened, the driver door is open and the vehicle is stationary (the 2017 Ford Fusion rotary shifter does this).

Design limitations

As noted above, unless the existing structure of the XJ6 dash is eliminated wholesale, there are some design constraints regarding the center tunnel console. The 1972 vintage look uses a relatively flat dash that merges into the console top as a simple L-shape. The shape transition employs end casings and underdash panels to block off gaps between the bottom of the dash the console tunnel merger.

The evolution of interior cabin design, aided greatly by CAD technology that can create all manner of complex curves, has moved towards a fusing of dash and tunnel with a fully integrated set of controls specific to the vehicle’s capabilities. Thus, retrofits of specific parts is a challenge.

Specifically, modern Jaguar interiors would be extremely difficult to “transplant” in pieces; the only way to incorporate the “fused” dash/tunnel look would be to remove the vintage 1972 original entirely. The 2017 Jaguar F-type represents an extreme tunnel-as-dash design where the traditional dashboard becomes something of an afterthought!

2017 Jaguar F-type interior where the tunnel extension dominates the dashboard

In addition to the fusion dash/tunnel trend, Jaguar has recently moved away from the shift lever entirely, electing to implant a rotary knob instead that retracts into the console when the ignition is off. Aftermarket Jaguar knob face covers are popping up, much like the center horn button emblems that adorn the Mk2.

2013 Jaguar XJ with twist knob transmission shifter

In cars that retain the shift lever today, a popular look tends to minimize any difference between manual and automatic operation. After all, since the automatic can behave just like a “manual” transmission, the manual handle with boot look has become increasingly popular. But we’ll probably have to drift away from the Jaguar DNA to find an appropriate part to retrofit in.

Possible shifter candidates

A good shifter candidate needs to meet these requirements:

  • about 2.5″ clearance between console top and transmission tunnel
  • attractive manual-like lever or full electronic control interface (rotary switch or push button panel)
  • built-in manual shift operation capability (+/- slots or buttons)
  • integrated backlit PRND position indicators
  • compatible with 4L65 transmission without major modification
  • symmetrical design that fits the XJ6 center console (less than 8.5 x 9.5″)
  • no buttons/switches with functions that cannot be used (like ABS brakes)
  • no brand identification that cannot be removed or modified

Electronic push button

PCS’s GSM push button control interface

GSM cable drive unit

Push button controls are still a novelty — especially in the aftermarket — and the only viable entry at the moment seems to be Powertrain Control Systems (PCS) who launched their GSM “universal” controller in 2012.

The GSM push button interface, a mere 4.5 x 3.0 x 3/4″ deep panel about the size of an iPhone, connects to the GSM Cable Drive that physically moves the transmission’s mechanical gear selector in response to digital signals from the push button panel.

In addition to the expected PRND buttons, two plus and minus button can manually move transmission gearing when in drive (they are disabled in reverse). Safety features include speed limits when shifting into reverse (less than 1 mph) and drive (less than 3 mph). The brake pedal must be depressed to shift out of park, now a common requirement in current car models. Buttons are also backlit for night operations.

The small footprint of the GSM makes it possible to place the shifter virtually anywhere in the cabin.

GSM push button shift in original console footprint

GSM shifter detail with rocker switches and start button

Console mockup with flush mount shifter

Mechanical lever

Unless the lever depth issue is resolved, an electronic shifter like the GSM may be the only option. All lever shifters researched so far required a raised console because the lever mechanism exceeds 2.5″. In addition, these shifters have proprietary transmission connectors, so modifications would be necessary.

2012 Infiniti G37 automatic shifter with manual boot handle and +/- slots

2017 Fiat Spider shifter

2016 Infiniti Qx50 shifter

2017 Hyundai Santa Fe Sport shifter

 

Head unit options

Single DIN head unit

Retractable screen opens out

If push button shifting is adopted this opens up an interesting option for the single DIN radio slot. Without a shift lever conflict (and the original design directly interferes with the radio interface), a head unit with digital display becomes practical. In fact, it would even permit a retractable 7″ screen common to several single DIN units like the Pioneer AVH-3300NEX receiver.

Single DIN head unit with screen in full viewing position

The HVAC controls and rocker switches would need to move up above the screen top, but there is plenty of room to do this. Retractable head units can be powered by Android or Apple iPhones to provide not only entertainment, but full screen navigation via Google or Apple maps.

Pioneer unit displaying ApplePlay interface for the iPhone

 

Armrest storage

The back end of the center shift console has an armrest with a storage area underneath.

Console overview with GSM shifter mockup

The flip-up top reveals an odd shaped plastic insert tray, now frail and damaged, with a down slope to allow for the placement of the rear HVAC vent.

Plastic insert tray

Since the vent will be eliminated (and the slope is inconvenient for cell phones anyway), some interesting possibilities arise.

A redesigned flat bottom tray with a USB charger at the front would also free up enough space to mount the GSM cable drive unit underneath. This elegantly solves the problem of the low console placement and permits the flush mounting of the GSM push button shift control.

Redesigned tray insert with GSM cable drive underneath

Placing the GSM cable drive under the tray also permits a good line-of-sight for the cable run itself (it attaches to the yellow outlet in the drawing below).

GSM cable drive position

End face

Armrest end face with ash tray

At the back of the armrest storage is an end face rear vent as well as a dated looking ash tray that covers the remaining gap to the transmission tunnel. The rear ventilation tubing will not be reinstalled (it didn’t work anyway) which frees up the end face for alternative uses.

One possible accessory is a rear-facing USB charger (it could also be used by the front passenger).

FRiEQ air freshener

To offset the lack of dedicated rear HVAC (the front Vintage Air system should provide comfortable climate control throughout the cabin), perhaps a FRiEQ air freshener would be useful. The ash tray can be eliminated or modified to hold a smart phone.