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[Marks DTM Calib]

does anyone know where the lambda wiring enters the engine bay....can find it for love nor money?

It follows the main engine loom from the back of the block and across the passenger side bank in the cable tray.

[Jay w]

update on today.....

the frame that arrived was for an 80L tank so one of the strap mounts needed repositioning, so that, and the frame went in pretty early on today, no more Sub though  

the tank is now connected to the filler, the loom is in. i only have 3 wires to locate and connect (lambdas and RPM signal) the ECU is by the pollen filter, as Martin has said in the past it is Hobsons choice, but it is kept dry, i just hope that it doesn't interfere with airflow too much.

the fuel guage/switch and low warning buzzer is all installed and on the centre console

Tomorrow is about finishing off the wiring, the inlet manifold will go on, injector brackets made and the injectors attached, and finally the pipe from tank to vapouriser will be fitted and that is it, if i can get the inlet and injectors on and plumbed before 12 o'clock then we have a fighting chance of getting this finished tomorrow.

pleased with the way it has gone today, my only other difficulty is finding a 9 pin serial to USB connector so i can hook the laptop up to the ECU in order to finetune, a visit to maplins first thing tomorrow may be in order

[JamesV6CDX]

Fantastic progress mate, you'll have that running in no time at all...

[Jay w]

its been a long few days and the kit is in and all connected  

yesterday took a lot more work than i thought, i wanted to use brackets like the ones in the pic earlier in the thread, couldn't do it as i didn't have the space with the shorter 2.5 plenium  

by the end of yesterday i had the front end filly fitted an connected and the whole back end done as well, today was all about the underbody.....

what a nightmare   if i hadnt had a 4 poster it would have been a lot more difficult, i wish they had suggested using the flexihose that James was sold.

Once it was connected time to fill it up and fire it up, £23.00 to fill up, back to the garage and hit the button...........

nothing, it spluttered and died  

connected the laptop to the OBD and it was telling me there was only 0.40 bar pressure, i had forgotten to connect the solenoid on the tank, as soon as we did that the pressure shot up to 1.1 bar  

however as soon as we started to run it on gas the pressure dropped again to .8 bar, it coughed spluttered and will not idle, when revved it will run badly and will not pull.
the OBD allows me to knock off sets of injectors, as soon as we knock off 2 or 3 the pressure rises again to .95 bar and it will idle a bit better but still not smoothly.

we have come to the conclusion that it is suffering from low fuel pressure, however i don't know if it is adjustable so i will have a chat with the chaps from motogas on monday and see if there are any issues they are aware of.

In one way it has been a few couple of days, in others it has been bloody hard work and now feel a little defeated

tools that you would need in order to do this.

multimeter
cone cutter
hole cutter
welder (to make the brackets)
lots of cable ties
soldering iron
the usual assortment of sockets, spanners, screwdrivers and hammers

it would help to have a long nosed 3.0 plenium, it gives you more room to mount the injectors on, the shorter ones makes things a little cramped, a second injection manifold would help as it allows you to drill and tap it whilst still keeping the car on the road  

[Paul M]

just a few pics for reference
http://farm3.static.flickr.com/2204/1948188503_59fc7d0caf_b.jpg
this is a 100 litre tank with an actual capacity of 79 litres
http://farm3.static.flickr.com/2247/1948188579_69c7e3ec46_b.jpg
they call this a four hole tank (fills faster)
http://farm3.static.flickr.com/2120/1948188599_994d73f1e7_b.jpg
no wasted space!!!!
http://farm3.static.flickr.com/2321/1948188543_fe901be984_b.jpg
ecu is in the only place available, with the pollen filter!

That is a fantastic job mate, neater than any professional one I have seen!

[Kevin Wood]

however as soon as we started to run it on gas the pressure dropped again to .8 bar, it coughed spluttered and will not idle, when revved it will run badly and will not pull.
the OBD allows me to knock off sets of injectors, as soon as we knock off 2 or 3 the pressure rises again to .95 bar and it will idle a bit better but still not smoothly.

I wonder if your fuel supply line hasn't been fully purged of air yet?

I guess it won't work until you've got liquid right up to the evaporator.

Is the LPG ECU showing sensible values for the manifold pressure (0.4 bar absolute when idling I'd guess), engine RPM and petrol injector duration on all injectors (another guess - about 3 ms when idling)? Can you see the Lambda sensor signals and are they going rich or lean when on LPG?

Kevin

[Jay w]

however as soon as we started to run it on gas the pressure dropped again to .8 bar, it coughed spluttered and will not idle, when revved it will run badly and will not pull.
the OBD allows me to knock off sets of injectors, as soon as we knock off 2 or 3 the pressure rises again to .95 bar and it will idle a bit better but still not smoothly.

I wonder if your fuel supply line hasn't been fully purged of air yet?

I guess it won't work until you've got liquid right up to the evaporator.

Is the LPG ECU showing sensible values for the manifold pressure (0.4 bar absolute when idling I'd guess), engine RPM and petrol injector duration on all injectors (another guess - about 3 ms when idling)? Can you see the Lambda sensor signals and are they going rich or lean when on LPG?

Kevin

optimum LPG pressure is about 1 bar according to the info i have on this system, on standby (on petrol) the LPG system sits at about 1.1/1.2 bar as soon as it is switched on it drops.
Lambda readings drop off as well, the voltage drops to about .5v on petrol they are sat at about .8v

The ODB system can't give me the LPG injector durations, it gives me the voltages and they appear to be about the same as the petrol ones.

does the LPG system need purging? i was under the impression it was the same as the petrol injection system, we have had the system running on and off for about 20 mins, i would have thought it would have bled itself by now

[Martin_1962]

ANy kinks in the pipework?

[Jay w]

ANy kinks in the pipework?

no, we have been over the pipework this evening, the guy who did the pipework did a very good job

[Kevin Wood]

does the LPG system need purging?

Don't know. Just wondered if you're only getting vapour at the evaporator and that's why it can't cope with the fuel demand of the engine. Sounds like it's going lean as soon as you switch over, which concurs with the drop in vapur pressure I guess.  :-/

Is there a manual valve on the tank as well? Is that fully on?

Kevin

[Jay w]

does the LPG system need purging?

Don't know. Just wondered if you're only getting vapour at the evaporator and that's why it can't cope with the fuel demand of the engine. Sounds like it's going lean as soon as you switch over, which concurs with the drop in vapur pressure I guess.  :-/

Is there a manual valve on the tank as well? Is that fully on?

Kevin

there is a solenoid on the inlet/outlet, it sounds like it is working (clicks on and off when the button is pressed)

[Kevin Wood]

Hmm.

The vapour pressure is referenced to inlet manifold pressure as there is a vacuum connection to the reducer so depending on whether the reading you are looking at is absolute or relative to the manifold vacuum it might be normal for it to drop with the engine running. :-/

 Worth trying to bump up the fuelling in the map a little to see if it sorts itself out? Or try doing an auto calibration of the LPG system?

Kevin

[Jay w]

Hmm.

The vapour pressure is referenced to inlet manifold pressure as there is a vacuum connection to the reducer so depending on whether the reading you are looking at is absolute or relative to the manifold vacuum it might be normal for it to drop with the engine running. :-/

 Worth trying to bump up the fuelling in the map a little to see if it sorts itself out? Or try doing an auto calibration of the LPG system?

Kevin

I believe 1 bar pressure readings are absolute.
i have tried to do an auto calibration, cant get the vapouriser hot enough, the auto calibration wont kick in until the unit hits 40 degrees, the best i can get is about 32 degrees, despite the temp guage reading 90 and the fans running.

we were talking about increasing the fuelling, but if the unit is giving as much pressure as possible and that is not enough is it going to be able to supply the additional fuel?

this is where i was hoping it would be plug and play, the set up/mapping is not my strong point

[Martin_1962]

Mine gets up to 60+ and stays there once engine is warm.

try heater off if on or vise versa

[Kevin Wood]

i have tried to do an auto calibration, cant get the vapouriser hot enough, the auto calibration wont kick in until the unit hits 40 degrees, the best i can get is about 32 degrees, despite the temp guage reading 90 and the fans running.

That doesn't sound right, and if the vapouriser was stone cold maybe that explains why it's starving it of fuel. Are you sure there's coolant flow through it? With it having warmed up on petrol (vaopouriser is doing no work thus extracting no heat from coolant) I'd expect it to sit pretty much at coolant temperature.

Kevin