Dual Fuel Tables for Petrol / LPG?

88incher · Post by **88incher** » Sat Jul 22, 2006 2:58 pm

Hi there, I'm currently building my new Rover V8 and want to run LPG as my every day fuel and petrol for when I want to go a bit quicker (-: I'm planning on using LPG injection for the LPG system and was woundering if the MS could handle two fuel maps? one for LPG and the other for Petrol, Idealy I would be able to switch between the maps using a dash mounted switch, I would also obviously have to switch between LPG injectors and petrol injectors.

Any one got any ideas/tips?

Many thanks,

James

mitsuko · Post by **mitsuko** » Sun Jul 23, 2006 12:08 am

I'm running an audi I5 for two years now with that setup ;

MS1 with the extra code

Petrol on inj channel 1
LPG on inj channel 2 .
An extra relay to cut power to the lpg inj when running on petrol .
Use the table switching option to switch between fuel and ign maps

Patrick

88incher · Post by **88incher** » Sun Jul 23, 2006 2:19 am

Thanks for that, How do you switch the tables over? Can it be done without hooking up to the laptop? E.i using an extra switch on the ecu?

Thanks,
James

mitsuko · Post by **mitsuko** » Sun Jul 23, 2006 3:09 am

Switching can be doen "on the fly " .
I have a small pushbutton switch mounted on my dash .

Can even switch doing 160Kph on the highway .
Car doesn't even bump .

Look at this
http://megasquirt.sourceforge.net/extra ... witch.html
There's the table switchingfeature explained .

Thesame switch operates my lpg solenoids , end an extra relay to cut power for the lpg injectors when running on petrol .

Pat

88incher · Post by **88incher** » Sun Jul 23, 2006 10:53 am

Ooooo So simple.

I'm getting quite excited now, out of intrest what gas injectors are you using?

Thanks for all the help,
James

mitsuko · Post by **mitsuko** » Sun Jul 23, 2006 12:12 pm

I've been experimenting with AG , Voltran and Keihin ( Prins/brc )

Keihins are the very best , but they are so da*mn expensive .

I've been told the new brc bottom feed's are pretty good ,ad reasonably priced , but I haven't had a chance to test them .

Other sources are bigas and romano but no experiance with those either .

All these are drygas injectors . Don't confuse them with liquid lpg injectors . Only vialle makes those .

Pat

engmpoll · Post by **engmpoll** » Thu Jul 27, 2006 11:17 pm

''88incher'' I seem to be in the same boat as you, i've got a classic v8 which i'm squirting and sparking, at first i was just going to run petrol injectors with a vaccum style lpg system but recently found out about the two maps at the flick of a switch so am now going to run lpg injection.

my question tho is do you need 8 injectors or can you get one big injector for the lpg? if you could you could mount it in the plenum after the throttle body it would certainly make things easier install wise.

Have you worked out the size yet for what the 8 injectors would need to be?

matt