dual injectors for LPG on V8
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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khimani_mohiki
- MegaSquirt Newbie
- Posts: 2
- Joined: Thu Jul 23, 2009 3:35 pm
dual injectors for LPG on V8
I want to run injection for both petrol and LPG on a V8, will MS be able to drive two seperate sets of 8 injectors or will i need to build some sort of relay switching board controlled by the LPG switch to change which injector set MS is controlling?
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: dual injectors for LPG on V8
It could drive two separate banks of 8 injectors; that is about its limit but it can be done. Each one can be given its own fuel map by running in dual table mode.
Re: dual injectors for LPG on V8
I am investigating doing this on a v12 and have made a mod on the v3 board to the input of U4 so that both injector driver circuits are used. I've hooked up a small DPDT relay to send PWM0-1 to both pins 2&4 of U4 for petrol and PWM1-1 to both pins 2&4 of U4 for LPG. You could equally do this with a logic circuit.
The second daughterboard plugs into (and intercepts) the signals between the output of the processor and input to U4. This means both driver circuits either see Table 1 or Table 3, depending on the table switching.
A separate changeover relay will then supply 12v to either the petrol or the lpg injectors depending on the table switch. MS simply sinks whichever ones are connected to 12v
kind regards
Marek
The second daughterboard plugs into (and intercepts) the signals between the output of the processor and input to U4. This means both driver circuits either see Table 1 or Table 3, depending on the table switching.
A separate changeover relay will then supply 12v to either the petrol or the lpg injectors depending on the table switch. MS simply sinks whichever ones are connected to 12v
kind regards
Marek
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khimani_mohiki
- MegaSquirt Newbie
- Posts: 2
- Joined: Thu Jul 23, 2009 3:35 pm
Re: dual injectors for LPG on V8
im ditching this idea now that im using the car daily (and its now my only running car), i was thinking something a lot more simple by using throttle body injection of LPG and leaving the petrol system alone. Essentially i want to get rid of the LPG mixer which imposes a restricion on the air inlet inorder for the venturi to work, Plus it makes my air box sit a few cm higher an interfere with the hood insulating pad. Very annoying as they are quite expensive