4.2 EFI.

[r1_pete]

A few pictures, if the link works, of my EFI project, using a much modified S3 XJ6 manifold, Triumph motorcycle throttle bodies, subaru injectors and pump.

Already on EDIS / Jolt, thats all coming off to be replaced by an ExtraEFI Megasquirt, controlling fuel and sparks...

http://i1273.photobucket.com/albums/y40 ... 1afe22.jpg
http://s1273.photobucket.com/user/r1_pe ... d.jpg.html
http://s1273.photobucket.com/user/r1_pe ... b.jpg.html
http://s1273.photobucket.com/user/r1_pe ... 3.jpg.html
http://s1273.photobucket.com/user/r1_pe ... 0.jpg.html
http://s1273.photobucket.com/user/r1_pe ... a.jpg.html
http://s1273.photobucket.com/user/r1_pe ... f.jpg.html

[Dave K]

Pete,

Looks complicated :D Have you worked all this out or has someone else done it before?

Dave

[r1_pete]

I haven't done an E Type before, I put a Ford Focus engine in an MGB, and EFId that with motorcycle throttle bodies, and a similar ECU.

Other Es have been EFId with expensive manifolds and Jenvey throttle bodies, but, these shift the injectors away from the inlet valve, and I think Jaguar got it pretty good with the S3 XJ6 injector position. Plus I would have spent close on ?4K, doing it that way.

As it is I'm in for about ?1500, including buying a ?900 TIG welder, and I've enough parts to build another 2, the banger boys discard the efi manifold, I've a collection of them, including one I re shaped, but won't be sure it clears everything till I get the carbs off this winter. Heres a pic the timbers replicate the frame rails:
http://s1273.photobucket.com/user/r1_pe ... c.jpg.html

EFI is pretty simple when you break it down, its measuring engine variables, and working out how much fuel to supply for a particular throttle opening and load, specifically, coolant temp, air temp, AFR Ratio (lambda sensor) throttle opening from a position sensor, and load, from the inlet vacuum.

Programming (Mapping) the ECU is key, I will get this as close as I can and then take it for a rolling road setup.

[jonr]

Interesting project!
Why are you not keeping the EDIS and just replace the Jolt with Squirt?
What Triumph model is the throttle bodies from?

[r1_pete]

I thought about keeping the edis, but came down on the side of minimising the number of components.

The throttle bodies are off 2001 on triumph 955s the 1050s are much the same, but have a casting which would need cutting off.

[jonr]

Are you trying to get it to work without a MAF sensor?

[r1_pete]

Yes, I will not have a MAF, there is no need for one with a TPS, air temp, and map sensor. The ecu can calculate the required fuel from those inputs, as it knows the position of the throttle, the air density, and the manifold pressure.

[jonr]

I am looking forward to see the final result!

[r1_pete]

Me too, I've been at it on and off for about 18 months now, I have all the major assemblies sorted - manifold / injectors / throttles / air filter, Fuel pump / pressure regulator, ECU / sub wiring loom.

I want to get the xj6 efi head I have machined up, then I'll fit the whole lot together over the winter months, I don't want the car laid up during the warm weather when it gets used.

[Jagboi]

I've been working on converting a 1966 S Type to EFI and I originally used MAP and the VE tables in megasquirt. On the 3.8 it was a nightmare to tune. On other engines I've done ( Chrysler 440) was easy, but the S Type fought me all the way.

I've just switched to MAF using a Jaguar X300 AFM and it is so much easier. The curve of voltage vs airflow is in the Jaguar CD from the JDHT and then the only tuning parameter is the req fuel parameter. Now the engine is running well. I think it feels like it has more torque too, but I have very few miles on it yet since the conversion. I know if I did another conversion I would go straight to MAF and not bother with a VE table using MAP ever again.