LPG Discussion Forum

Well, I thought I'd pop back for an update... Its been a quick 2 1/2 years hey? Wow.
Anyway, the old Landcruiser is still going, using the last settings as per above. It has run flawlessly. Mileage is still better than the old mixer system, power is good. No alarming and switching to petrol, the bit ...

Thanks for the feedback gents and yes I am aware (after quite a bit of educating) that my system isn't right for this engine. Ultimately I will replace the reducer, possibly the nozzles and maybe even up the size of the main gas line. Right now however, I am truly stuck, can't even legally take it ...

A bit more fiddling and I have the lambda at .57v at 2000 rpm, foot on brake method. I am a bit reluctant to go any higher rpm using this method, worried about my transmission. Anyway, does this look like I am heading in the right direction?

Now in this first screenshot below I held my foot on the brake and gave it a bit of gas. The lambda is .8v I then reduced the numbers for that row, did the foot on break thing and now I see about .5v as per the second screenshot. I assume I keep doing this for each row I can until I am getting about ...

Hi Simon and all,
Well, after a longer than expected absence I'm back and fiddling with my car again :) We are still locked up here in Melbourne and I am sick of house maintenance so back to the car. In the interim the old girl has been running fine with the petrol addition and the last map that was ...

1500rpm.png
1750rpm.png

This one is immediately after the alarm and switch back to petrol, not sure if it is of any value but thought I'd include it just in case.
switch to petrol.png

Thats it for now, I'm off to work for a few weeks tomorrow, no doubt I'll be doing some more fiddling when I ...

Righto... I got the below screenshots this morning with the engine under load at various RPM. With this map loaded the idle is too low and its missing a bit, running a bit rough in general at any rpm and load. I guess that's because it's running lean as hell with the injector timing set so low? I ...

I loaded up the new map and no matter what percentage I changed the rows by, I couldn't get the lambda to read over .04, I think I may be at the limit of my understanding. I put the engine under load at 500, 1000, 1500 and 2000 rpm and observed the lambda reading, it remained steady at .02 until I ...

"Not bad for guestimating a calibration map at the other side of the world based on just anticipated injector response and manifold pressure info ;-)"....indeed this is quite amazing, what a world we live in. As a bit of an old sci fi nut, the time lag in comms is very reminiscent of some books I've ...

This below is a picture with the engine under load using the foot on brake while applying throttle technique. This shows the mixture becoming richer while under load?

OK, I have the lambda up and running, sits at about 0.80 volts idling on petrol then goes to between 0.02 and 0.04 idling on gas. If I gently increase the rpm, keeping the green ball in the same ms range it doesn't change, if I give it a quick tip in it goes up to around 0.80 volts when the ball ...

Ah ha, that makes sense

I got my lamda probe and installed it today. Tomorrow the wiring and calibrating. Do I just get set it up and hit autocalibrate?

For now I have map A running and have set petrol addition to 10ms petrol addition above 10ms pinj and 3000rpm. Just took it for a run up the hills and it's going well, no alarms, plenty of grunt. That'll do for now until my lamda stuff arrives.

Right, I can't fault it, really no noticeable difference between petrol and lpg. I am going to order the parts and fit a lamda probe. Narrowband you say? Was thinking I'd get 4 wire so it's the heated type and do a clamp mount as I'll soon be replacing the exhaust, do a weld mount to the new exhaust.

Morning Simon,
I've had a bit of a reprieve on the work front so have a couple more days to play around with this thing. This morning I loaded map A and the results are pretty bloody good. I could only get it to switch back to petrol on the very steepest of hills at the hardest acceleration, far ...

Thanks Simon, that's awesome, I can't wait to get home and give these a try. Increasing the gas pressure is a pain but I can do it. There is no adjustment screw on this reducer so I have to shim it as per earlier advice from you. I may not get to it for a couple of weeks, I'm about to head off to ...

Hi Simon,
I ran the tests you describe above this morning. Warmed the engine up and had MAP at .33/.34 bar at idle on petrol. I switched to LPG then switched each cylinder to petrol and back to LPG checking the MAP at each change. I found no variation in MAP pressure, it remained at .33/.34 bar each ...

Hi Simon,
I have sent screenshots to your email at "cheapmotoring"

Cheers,
Rod

Alright, we may be getting somewhere! I had originally planned to buy and fit a lamda probe and can still do so but I'll try this manual mapping plan first. I'll get back to you with the results a bit later. Once again I have to thank you for your time and effort helping with this thing, if I ever ...