Bigas lpg control with megasquirt

For discussing injector selection, manifold modifications, throttle bodies, fuel supply system design and construction, and FIdle valves and IACs.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Post Reply
M545i
MegaSquirt Newbie
Posts: 2
Joined: Mon Feb 14, 2005 10:03 am
Location: Belgium

Bigas lpg control with megasquirt

Post by M545i »

My car is a BMWE30 325i with SGIS bigas lpg system.
I currently run MS v2.2 fuel only. Petrol is ok but I have problems running the lpg system through my megasquirt. Now I am not sure what impedance my bigas injectors are (will measure soon) but I would like to control the injectors directly via MS and have seperate ve table for petrol and lpg (dual table?).

I can see how I need to wire in a relay to activate the solenoids and stuff for the lpg system to work but I don't know how I can control this relay with MS. It is not convenient to have the laptop continiously in the car and swap the tables manually :lol: .

Thanks,
M545i
mitsuko
Helpful Squirter
Posts: 49
Joined: Tue Mar 30, 2004 10:49 pm
Location: Belgium

Post by mitsuko »

Take a look here :

http://www.msefi.com/viewtopic.php?t=11 ... light=dual

and here

http://www.msefi.com/viewtopic.php?t=11 ... light=dual


Don't hesitate to call if you have more questions .

Bigas are high imp btw

Pat
M545i
MegaSquirt Newbie
Posts: 2
Joined: Mon Feb 14, 2005 10:03 am
Location: Belgium

Post by M545i »

I've seen your posts, I understand that dual table works for two fuels but I am not sure how I can activate table 2 (lpg) via my relay for switching to lpg the injectors + tank solenoids. I read you do that with the NOS function, but how? In DualTable code I don't see any of the functions (NOS,...) that I had when I run extra025 code with MT225b623?

Thanks for helping me out,

Mischa
mitsuko
Helpful Squirter
Posts: 49
Joined: Tue Mar 30, 2004 10:49 pm
Location: Belgium

Post by mitsuko »

There are three tables .

Table 1 or 3 controls inj1 , use this for petrol
Table 2 always controls inj2 ( dual table function ) use this for lpg

What you need to do is add the table switching circuit to the megasquirt .
Then use 12V on that input to switch table one to table 3 .
You can set table 3 to zero to disable petrol .

The 12V schould also enable a relay , switching power on to inj2 .
This way , megasquirt can only fire inj2 when the relay is passing 12v to the injector bank .

Pat
Post Reply