Moby i will inquire for you there are 2 installers in my area and also a main importer but it might be Monday or Tuesday evening before i can get back to you with the info
Sparky
I had a map made specially for the car whilst driving it on the road by my LPG installer
These are the step progression i made in getting my system right
Step 1 Standard S14a fitted a Multi Point Sequential Gas Injection (often called 'SGi')
Suitable for sequential and non sequential electronic multi point fuel injection engines with Oxygen (Lambda) sensor, Catalytic converter and plastic inlet manifold(s) and all Turbocharged and Supercharged engines.
It was latest Romano 'N' type Multi Point Sequential Gas Injection System
The 'N' system requires even more information from the engine but uses a lot of data from the vehicle's existing engine management instead of picking it up raw at source as the earlier system did. Additional information required is -
Gas temperature
Gas pressure
Petrol injector pulse length
The system also has its own ECU but this works in conjunction with the Petrol ECU, instead of working alongside it like the earlier non sequential system.
Even more benefit of performance and economy are delivered by the new Romano system, along one or two useful bonuses. The new system will 'sense' that gas pressure is low and switch back to petrol before the gas tank runs dry - A very useful trick. It will even give you an audible warning to tell you it has done this. A 'self check' protocol has been added to the changeover procedure so that the system will not move on to gas if a problem exists. The system now handles enigines up to 400 bhp with a single vaporiser which makes life easier for us and more reliable for you. Last but not least, the latest 'FAST' type injectors can be stripped and cleaned using only basic tools, no more worries about injector contamination by poor quality gas.
Problem i had with the above was at aprox 3200 rpm the car switched from LPG to Petrol and then back again when the revs droped changing up through the gears
This problem was reckoned to be not enough gas flow so the bore of the pipe was up from 6mm to 8 mm
Step 2 the car would rev to 5000 rpm then change from gas to petrol and back again like before . We had moved the problem higher up the rev range. After a lot of trailing we deduced that the change over was caused by the standard petrol injectors maxing out at 100% duty cycle and so not emiting a pulse that the system required the LPG injectors to fire and so thought the system was out of gas and changed over to petrol
Step 3 i decided to go the whole hog and went K&N Cone Filter - Z32 Maf - 555 Nismo Inj - Walboro Pump - Apexi FMI - Custom built ss exhaust 1 box no cats - Jezz stage 2 chip and tune
Jezz fitted the chip and mapped the petrol side we left the LPG disconnected in case of conflict issues . Brought the car home and my LPG installer had me drive the car for a couple of hrs whilst he set the LPG map to run using a programe he had written on his laptop
As far as i know the car is still running with no issues today
Sorry for the rambling post hope it helps fellow
Clai