Bifuel software support

[mr_g]

So here is my solution...
LPG connected to INJ04-07 LOW-Z
Petrol connected to INJ00-03 HIGH-Z

Instead of switch, you can use some TTL logic, but this is not to complicate picture...
What do you think?

[Bat]

Hi,
I like the idea, simple enough to be possible and would only need dual table swithcing in the software to implement it
Cheers,
Gavin

[MWfire]

1.1.32 has switch-activated full-table-and-config-swap
Have anyone tested this version of firmware?

[Bat]

Hi,
Does that mean it has a switchable boost table too?
Because I'd be really interested in that! 
EDIT: That should do the job for the LPG too, with no hardware mods required?
Cheers,
Gavin

[rob@vems.co.uk]

It switches the whole config and tables, the lot, everything.

As for testing, its the sort of thing we could easily do here, just needs people to back-up their working installations (using download-config NOT MegaTune ) and to try getting the new stuff to work - report bugs to the developers and see how we get on.

Rob

[mr_g]

Nice... Can this new hanky-panky software change injector outputs also? So I would use INJA:D for petrol and INJE:H for LPG? Or there is a problem of injector left open when switching if the switching was during the time period it was open?

BTW, Rob, can I connect fuel pump, IAC, shiftlight, rpm out, etc on other outputs than INJ (if can, on what)?

[MWfire]

BTW, Rob, can I connect fuel pump, IAC, shiftlight, rpm out, etc on other outputs than INJ (if can, on what)?

You can connect to p259(350mA max), s259,i259,specfet.

[mr_g]

How many 350mA outputs there is (? I have to solder stepper driver so I would then have 1A outputs.. Right?

Can I use ING outputs for IAC, boost?

What about Drive-A and Drive-B outputs? I have IAC (aprox 2A) and Boost valve (1A). Could I connect them to this outputs if  ING outputs are unavailable?

This forum is great. With my friend Damir Muha, this place and a lot of headache on wiki, I know a lot more about VEMS then 5 days before... :lol:

[rob@vems.co.uk]

You can use spare ignition drivers for solenoids.  The stepper gives you 4 1A outputs - note: it can push 12v as well as switch it to ground, we've got VTEC solenoids switching using the stepper, and I'm going to see if I can get my Nissan Tacho running driven directly from the stepper

[mr_g]

So, I can use any spare output (ING, INJ, P259, stepper, Drive-A/B) for misc outputs like IAC (PWM), boost (PWM), shiftlight, tacho, fuel pump reley, tank vent valve, coolant vent, etc... All I have to worry about is supply current... Right?

What about misc inputs? I need inputs for: LPG (switching configs), ALS, Flat shifting? Also I need monitoring (analog) for pressure in LPG rail. And anything else I can't think of now?

[Bat]

Hi,
As far as I know you can only get PWM on the INJ outputs.
Cheers,
Gavin

[mr_g]

But it's a slow PWM for IAC and boost... And I think that drive-a/b are PWM outputs... If only that is implemented in firmware..

[rob@vems.co.uk]

If you're making your own unit up from a PCB then you use the spare inputs on the A2D converter - I'm not 100% sure on how thats done (I was told but I forgot it, mainly because I was more interested in Writing the User Guide for completed units).

[mr_g]

I used drive-a, drive-b for IAC and boost and it works fine (specfet in megatune).
P259 works fine with rpm, fp, etc (thank you MWfire)...

Now I have to get working bifuel support...

My idea is this:
I'm driving on LPG, and when I press hard and LPG injectors reach like 95% of duty cycle, VEMS opens gasoline injectors as needed (staged injectors)... Is this possible in double configs?

On the other hand, when I switch config to gasoline, and I'm driving on gasoline, and when I press hard and gasoline injectors reach 95% of duty cycle, VEMS opens LPG injectors as needed (staged injectors)... If I get big enough injectors for gasoline, this would never happen, but it's to solve the problem of injector left open when switching configs...

Is this possible? Can Marcell answer this question, please?

[rob@vems.co.uk]

I can't repeat enough, we dont get any support from anyone but us here unless I go and get someone like Jorgen or Jason to help.  Marcell is actively against the forum and has asked me to shut it down in the past because he thinks the Wiki is the answer for support.