Converting a V 12V E TYPE to fuel injection

[Peter Collins]

I would like to know how many fuel injected E TYPES are now on the road, my v12 has be on the road for seven years now.

[jagwit]

I would like to know how many fuel injected E TYPES are now on the road, my v12 has be on the road for seven years now.

I had a '73 OTS which was fuel injected. I used HE EFI hardware but I used a Megasquirt 2 ECU which also managed a dual EDIS-6 wasted spark distributer-less ignition system.

It was also running 11:1 CR pistons with HE heads and standard exhaust. With a light weight Fidanza flywheel, the car was as fast as my friend's 4.0 XKR. Still sorry I sold it....

According to the new owner it still runs fine.

[MLBS3V12]

Another one here!
I'm restoring slowly a S3 since a few years. I've place back the engine on the car. It is a XJS one with the standard Jag EFI management. I've fit a Fidanza and a Getrag box.
Hope to finish the car in 2 years.

[vee12eman]

Hi. Another here in Victoria, Australia, though it's not mine. I took pictures at a concours meeting. I have some of the gear to convert but not all and it's harder to find over here. One day I hope.

Regards,

Simon

[MLBS3V12]

Hi Simon,

do you mean you plan in a short term to modify your car and use EFI on your S3?

Michel

[vee12eman]

Hi Michel,

I am hoping to make the change to injection one day but I don't have all the kit needed and not much time at present so I'm not expecting it to be in the short term.

Regards,

Simon

[jagwit]

At the risk of bursting a few bubbles.....

I have a '74 Jensen Interceptor with the Chrysler 440 cubic inch (7.2L) engine. It came fitted with a Carter Thermoquad carb. When I got the car, I had no idea how good a carb the TQ actually is, which is why I immediately set about converting the engine to EFI. This is lovely.

But the car was still running at 3100rpm when doing our national speed limit (120km/h). This, combined with a bad input shaft leak prompted me to convert the transmission to a 4sp auto with a GM 4L60e which has a 0.7 4th gear. This now means that when it runs 3100rpm in 3rd, the rpms drop to 2100rpm when it shifts into 4th. This is bliss!!

My E-type is doing 3300rpm in 3rd when doing a GPS 120km/h. With the above Jensen experience, for the time, effort and money, I would MUCH rather convert the transmission on my E to having a deep overdrive, long before converting it to EFI (as I have done before to my previous E).

[Paul Buckley]

I have a '72 S3 OTS which I intend to convert to EFI, having bought a HE V12 engine from a S3 XJ12.
So far I have stripped down the XJ12 engine, had the 12 injectors overhauled and prepared all the other required bits for plating. I have the HP fuel pump, inertia switch, ECU (which has yet to be remapped by AJ6 engineering) and a new vacuum capsule for the HE distributor.
I will put the ECU above the passengers footwell, as suggested.
I think I have everything that is required for the conversion, it's just a question of finding the time ......
Oh, and the conversion guide provided by Roger Bywater at AJ6 is invaluable.

With ref to previous posts, when the car was new it never returned more than 17 mpg which, after running it as a daily driver for three years, is the main reason that I laid it up for more than twenty five years!
I have fitted five speed box and, with the EFI, I am looking forward to instantaneous cold starting and at least 23 mpg.
He said .....

Paul B.

[jagwit]

...ECU (which has yet to be remapped by AJ6 engineering)

I am looking forward to instantaneous cold starting

AJ6 remapping would be waste of money IMHO. Rather spend the money you WOULD have spent on remapping on an Innovate Motorsports MTXL wideband oxygen sensor so that you can KNOW EXACTLY what is happening with your fuelling, rather than spending money based on assumptions.

Mine is fitted with the standard ZS carbs. Instantaneous cold starts. Better in fact than hot starts. So if you don't have good cold starts, your mechanic does not have a clue how to service/set your carbs. How then will he know what he's doing when you throw EFI at him???

[MarekH]

The downside of the AJ16 route is that you are buying 25 year old technology which you do not have access or abilty to alter/customise to your own needs. The upside is that the parts ought to be freely available and well understood by anyone who understands a fuel injected Jaguar v12 - which is still almost no-one these days.

FWIW my car is fuel injected, running both lpg and petrol via Megasquirt which can fuel and trim cylinders individually aswell as provide control over all peripherals with datalog support as standard.

kind regards
Marek

[MLBS3V12]

Hi Marek,

what version of Megasquirt have you used on your car ?

Michel

[MarekH]

Dear Michel,

I am using a MS3 with a MS3X card.
The MS3X has four extra high impedance injector drivers fitted.
It runs the ignition via six BIP373s in wasted spark mode.

There is a cam sensor on the B bank cam sprocket so it runs sequentially.
I have also built a peak and hold box to run low impedance injectors.
I also have a JBPerf IOextender for additional inputs.

You can also run a v12 using MS2extra if you wish for a less complicated setup.

kind regards
Marek