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[Kevin Wood]

Evaporator output pressure is referenced to intake manifold pressure anyway, so, in theory, it tracks it to provide a constant pressure across the injectors. In theory. Whether it will still keep up with flow when delivering 1.5 bar+boost pressure, and what it'll do when you suddenly lift off and the pressure is 1.5bar+boost pressure+manifold vacuum remains to be seen. The systems are supposed to work with FI just as they do with a natasp engine but it's new ground for us.

Of course, with forced induction, one can't over stress the requirement to prevent it going lean. I think I'd be investing in a  wideband lambda sensor, as the usual rich indication on a conventional lambda isn't really good enough on boost. I'd want to know it's down below 12:1 (petrol equivalent) on boost.

I can't see the XJR having anything but a conventional fuel (petrol) system, but the S type may well need some tinkering there if JV6 is considering LPG. May well need flashlube and all sorts considering it's a Ford derived engine.

[aaronjb]

If you need to borrow one, I have one of these sitting in the garage: http://www.innovatemotorsports.com/products/lm1.php (actually I have it's slightly less fancy looking predecessor, the LM-1).. We'd just need to get an exhaust sniffer mount for the wideband sensor (unless there's a bung somewhere already).

[Kevin Wood]

Can you get a simulated narrowband output from that? I know you can from my ancient TechEdge (which I'd also be happy to offer, but it's kinda integrated into the Westfield's wiring loom currently).

If you can, just replace one of the pre-cat lambdas with it and feed the narrowband output to the ECU to keep that happy.

[Gaffers]

I can't see the XJR having anything but a conventional fuel (petrol) system, but the S type may well need some tinkering there if JV6 is considering LPG. May well need flashlube and all sorts considering it's a Ford derived engine.

That is what put me off getting the S-Type and a later XJR.

[Gaffers]

Can you get a simulated narrowband output from that? I know you can from my ancient TechEdge (which I'd also be happy to offer, but it's kinda integrated into the Westfield's wiring loom currently).

If you can, just replace one of the pre-cat lambdas with it and feed the narrowband output to the ECU to keep that happy.

Ok, it sounds like I am going to have to do some more research on this.  Wideband O2 Sensors are new to me.

[aaronjb]

Can you get a simulated narrowband output from that? I know you can from my ancient TechEdge (which I'd also be happy to offer, but it's kinda integrated into the Westfield's wiring loom currently).

If you can, just replace one of the pre-cat lambdas with it and feed the narrowband output to the ECU to keep that happy.

Yup, it even has programmable switch points.. ditto for the standalone LC-1 that I also have sitting on a shelf - might even part with the latter permanently given sufficient monetary persuasion as I'm not 100% sure I'll run a full-time wideband display on the V8 

[Kevin Wood]

Can you get a simulated narrowband output from that? I know you can from my ancient TechEdge (which I'd also be happy to offer, but it's kinda integrated into the Westfield's wiring loom currently).

If you can, just replace one of the pre-cat lambdas with it and feed the narrowband output to the ECU to keep that happy.

Yup, it even has programmable switch points.. ditto for the standalone LC-1 that I also have sitting on a shelf - might even part with the latter permanently given sufficient monetary persuasion as I'm not 100% sure I'll run a full-time wideband display on the V8 

You can just pour it into that with a watering can, and to hell with what comes out, can't you?

[aaronjb]

Can you get a simulated narrowband output from that? I know you can from my ancient TechEdge (which I'd also be happy to offer, but it's kinda integrated into the Westfield's wiring loom currently).

If you can, just replace one of the pre-cat lambdas with it and feed the narrowband output to the ECU to keep that happy.

Yup, it even has programmable switch points.. ditto for the standalone LC-1 that I also have sitting on a shelf - might even part with the latter permanently given sufficient monetary persuasion as I'm not 100% sure I'll run a full-time wideband display on the V8 

You can just pour it into that with a watering can, and to hell with what comes out, can't you?

  Something like that! Although with the 3.058 diff and fuel injected throttle bodies I'm hoping it's not too bad.. in reality I'll probably have so much money invested in the engine that I'll go for a professional tune, though, and then not spend the rest of my life staring at an O2 gauge like I did with the MR2

[Gaffers]

Ok I have read up about wideband lambdas and it makes sense that I should use one.  They aren't cheap though!  The AJ16s are bulletproof but to a point.  I am starting the work in Jan, recovery from Operation permitting

Edit:  I take it that fitting one is fairly straight-forward and that I dont have to program the bugger?

[Kevin Wood]

Ok I have read up about wideband lambdas and it makes sense that I should use one.  They aren't cheap though!  The AJ16s are bulletproof but to a point.  I am starting the work in Jan, recovery from Operation permitting

Edit:  I take it that fitting one is fairly straight-forward and that I dont have to program the bugger?

You only really need it for setting-up the LPG system, I'd say, so the borrow option would be good enough.

.. and I doubt there's a "professional" LPG fitter in the country who would bother, but I would, personally.

[2woody]

Evaporator output pressure is referenced to intake manifold pressure anyway, so, in theory, it tracks it to provide a constant pressure across the injectors. In theory. Whether it will still keep up with flow when delivering 1.5 bar+boost pressure, and what it'll do when you suddenly lift off and the pressure is 1.5bar+boost pressure+manifold vacuum remains to be seen. The systems are supposed to work with FI just as they do with a natasp engine but it's new ground for us.

Of course, with forced induction, one can't over stress the requirement to prevent it going lean. I think I'd be investing in a  wideband lambda sensor, as the usual rich indication on a conventional lambda isn't really good enough on boost. I'd want to know it's down below 12:1 (petrol equivalent) on boost.

I can't see the XJR having anything but a conventional fuel (petrol) system, but the S type may well need some tinkering there if JV6 is considering LPG. May well need flashlube and all sorts considering it's a Ford derived engine.

don't forget LPG is 110 Octane

[Kevin Wood]

Evaporator output pressure is referenced to intake manifold pressure anyway, so, in theory, it tracks it to provide a constant pressure across the injectors. In theory. Whether it will still keep up with flow when delivering 1.5 bar+boost pressure, and what it'll do when you suddenly lift off and the pressure is 1.5bar+boost pressure+manifold vacuum remains to be seen. The systems are supposed to work with FI just as they do with a natasp engine but it's new ground for us.

Of course, with forced induction, one can't over stress the requirement to prevent it going lean. I think I'd be investing in a  wideband lambda sensor, as the usual rich indication on a conventional lambda isn't really good enough on boost. I'd want to know it's down below 12:1 (petrol equivalent) on boost.

I can't see the XJR having anything but a conventional fuel (petrol) system, but the S type may well need some tinkering there if JV6 is considering LPG. May well need flashlube and all sorts considering it's a Ford derived engine.

don't forget LPG is 110 Octane

That is true, of course...

[aaronjb]

Ok I have read up about wideband lambdas and it makes sense that I should use one.  They aren't cheap though!  The AJ16s are bulletproof but to a point.  I am starting the work in Jan, recovery from Operation permitting

Edit:  I take it that fitting one is fairly straight-forward and that I dont have to program the bugger?

Nothing is bulletproof if you run lean under boost

But if you just borrow one (say an LM-1) and use the tailpipe mount (a bit like the MOT probe) then fitting is as straight forward as plugging it into the cigarette lighter and the LM-1 into a laptop via a serial port..

[Kevin Wood]

Ok I have read up about wideband lambdas and it makes sense that I should use one.  They aren't cheap though!  The AJ16s are bulletproof but to a point.  I am starting the work in Jan, recovery from Operation permitting

Edit:  I take it that fitting one is fairly straight-forward and that I dont have to program the bugger?

Nothing is bulletproof if you run lean under boost

But if you just borrow one (say an LM-1) and use the tailpipe mount (a bit like the MOT probe) then fitting is as straight forward as plugging it into the cigarette lighter and the LM-1 into a laptop via a serial port..

Will it work post-cat, though?

[Marks DTM Calib]

Surely it needs to be pre-cat to give mixture details?