LPG tuning

Hi,

I would have expected to see some values in the map;

http://imgur.com/a/LqdaL#5

Does it run OK on LPG? When I've tune my LPG I tend to rough out a map then drive about with the laptop connected reading lambda output, looking for it to be just on the rich side rather than the lean. I use a different system on a NA V8 but principal should be the same...

map.jpg


I probably differ though as I'm not using ODB to trim the map. I would think yours is pretty much plug and play?
 
Where do i see if is rich or lean? What is the optimal value. I didn't pay any atention to lambda.
I did a auto-calibration. I erase the petrol and the lpg map, drove on petrol and then on lpg same route same condition.
This is my new map.
http://imgur.com/a/zuWi7#0
 
If you're not having issues or have any doubt about what you're doing it might be best to just let it self tune which it sounds like it's doing fairly well.

If you want to investigate further then the output for lambda should be very similar on both LPG and Petrol, figures will depend on sensor type although I would assume wide band.

It's also good practice to take a backup of the ECU settings before changing anything, especially if you don't know what you're doing.

As mentioned above there are LPG specific forums.

What sort of MPG are you getting on the LPG?
 
q6600 said:
Where do i see if is rich or lean? What is the optimal value. I didn't pay any atention to lambda.
I did a auto-calibration. I erase the petrol and the lpg map, drove on petrol and then on lpg same route same condition.
This is my new map.
http://imgur.com/a/zuWi7#0
Click to expand...

The 3rd image is a comparison between petrol injector times when running on petrol/lpg. You ideally want those plots to be identical, which in simple terms means the ECU sees no difference and needs to adjust nothing when switching between petrol/lpg. You can adjust it by adding a point to that line and manipulating it up/down.

If the plots match, your calibration is pretty much complete. I would turn off any auto adaption you are using, it usually makes a mess of things and ruins any linearity.

Further tuning on the rpm/load table as shown by task is not necessary to get a system which 100% mirrors your petrol map, and tbh I wouldn't adjust anything on there unless there is a specific issue/flat spot you are looking to address, or you want to do further tuning in conjunction with a wideband lambda (e.g. if you have a turbo car which runs <11:1AFR at high load you could lean this out for more power, just as you would with a remappable ECU)
 
Today i start early in the morning playing with my car.
I finish my map, and took the car for a 206 mile trip. 170 miles on highway ( 80 mph most of my driving ) and 36 in town.
I had a consumption of 10.57 l / 100/km 27 mpg. This was with the roof down, putting the roof up will result in better mpg.
I had some help from some one regarding the pressure correction, now my car doesn't have no lag on acceleration, you will not fell the deference on petrol or lpg.
My long trim fuel is 7.68, from the information that i gather is ok.
My new map ( very proud =))) )
http://imgur.com/yUfHeHk

BTW this was the map from my lpg garage
http://imgur.com/tTJSU5N
 
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