To be fair to the OP he seems to have been left in this mess by an installer, although whether they've refused to have it back in for rectification or he's given up we don't yet know.
O.K fair enough, what I'm trying to do is point in the right direction which is Stag manual.
This is step by step set-up and tuning of Stag system(300+,Premium,Stag4) based on Satg manual.
This is the way I'm doing and it works o.k form me.
Hope it'll be helpful
First of all, make sure your installation is spot on:
-right injectors
-right nozzle size
-same length of pipes between injectors and manifold
-no leaks in air intake system
No errors in car ecu (delete with scanner or disconnect battery for 1h and reset ecu)
If you decide to disconnect battery, run a car on petrol for couple of miles to re-teach petrol ecu.
1. Auto-calibration.
Before auto-calibration make sure engine is hot.Switch off all lights, A/C and do not move steering wheel while auto-calibration process.Engine should run at idle.
After auto-calibration finishes you can see the multiplier in MAP tab.Multiplier at this point should start between 1.2 and 1.6 and ends on 1. If it's below 1.2 or greater than 1.6 it means there's something wrong with nozzle size/ vap. pressure set.
The thing is, to get right nozzles size with vap. pressure between 1.0 -1.2 ,to achieve multiplier as mentioned above.Of course in case of wrong nozzles error massage come up on the end of auto-calibration.Manufacturer "injector table size" should be only guide, not "must be".(Does not apply to Keihin or Hana2000 injectors.)
Multiplier high=nozzles too small.
Multiplier low= nozzles too big.
2.Collection of the petrol injection map (petrol map)
The most important thing while collecting maps (LPG and Petrol) is to do it in the same conditions!
I always do it on the same route,drive on petrol,collect map and do exactly the same route when switch to LPG.
Switch over to petrol and drive for at least 5 miles to collect petrol map.I usually divide that in 2 stages:
-driving with different loads and speeds(foot in the floor on all gears)
-driving calm (OAP style
)
After finish, in MAP tab, you will see
blue line which is graphic picture of petrol inj. times running on petrol
3.Collection of the petrol injection map running on petrol (LPG map)
Switch over to LPG and do exactly the same as in step 2.
After finish,in MAP tab, you will see
green line which is graphic picture of petrol inj. times running on LPG.
In perfect situation both should match... which is impossible...
4.Checking if maps match(deflection)
In Deflection tab you can see deviation graph.If deviation fits within -10% to +10% the controller is programmed properly.
That what manual says, but you can always do better ! (mine deviation fits between -3% and +3%)
5.Correcting maps.
At this point you've got 2 different maps which probably does not match.
You need to adjust multiplier by moving up or down yellow dots located on multiplier line.By doing that, you are moving (adding or lowering gas amount)
green LPG map.You can add some more dots by pressing right pad key(or mouse) on multiplier line or delete them by click on dot and press Delete key.Usually I put dots where I need to adjust multiplier.
Now go on the road(same route) this time there's no need to put your foot down, just drive like you drive everyday.It is better and much safer to do with help(someone driving and you do the tuning or vice versa)
Manual says to observe petrol inj. times and change yellow points but in my opinion you can do it just by observing green and blue line.Move up or down dots to match lines from the beginning to the end.Perfect match means, you should see one thin line.
That's it.
There's also ISA2 which is auto-adaptation option in Stag300 ISA2 and Premium but there are many different opinion about it...
in some cars works good in some cars makes problems. Basically it is autocorrection(fine tuning) to correction we've just done(you can see it in "RPM CORRECTION" tab) I ran a car for couple of days with isa2 on and then switched it off.
Some people use this option for tuning,not correcting maps on the road first,and then all the problems starts....
Hope it will help.