Bifuel software support

[mr_g]

Is there any chance, that we could get software released with this option?

4 inj outputs with gasoline and other 4 inj outputs with LPG...

On turbo engiine, of course...

Maybe with some switching on boost...

[rob@vems.co.uk]

The switchable setup is still in testing.

[mr_g]

OK. C'mon guys, want to switch on VEMS... Waiting for bifuel...

[rob@vems.co.uk]

I'm not wishing to be rude, but have you actually got the car running on a single fuel yet
Getting an engine on a stand-alone ECU up and running is far from easy, and making a bi-fuel setup that works is going to add further complication...

[mr_g]

Yes, but, this is a daily driver. If I switch to VEMS on fuel, then I would have to be going to work with bus... No way...

[rob@vems.co.uk]

Maybe I'm missing what you're trying to do - are you planning on using VEMS to run the second type of fuel and keep the stock ECU running on gasoline?

[mr_g]

No. I want to remove both motronic and landi renzo... So VEMS can take over everything...

I see that 1.1.33 has this feature...

[rob@vems.co.uk]

Then you'll be taking the Bus to work as theres no way you'll get two fuels running any faster than you'd get one fuel working.
Seriously get petrol running first, then your car will not be immobile as you wrestle with the complexities of getting a second fuel working.

[Bat]

Hi,
Doesn't LPG have a higher knock resistance than petrol?
Cheers,
Gavin

[MWfire]

lpg has 110-115 octane value(depend on propan-butan ratio)

[Bat]

Hi,
That's what I thought, so why would you want to switch the LPG off when on boost?
Cheers,
Gavin

[mr_g]

Because LPG injectors can supply only 40kw per cylinder MAX... So, on 0.5bar boost that is over 40kw...
That's why...

But driving on petrol every day to work is to expansive...

[Bat]

Hi,
I see now  I've learned something else, as I'll be looking into LPG in the future.
Cheers,
Gavin

[mr_g]

What do you think, when will this release for bifuel be official?

I'm waiting for the right moment to switch to VEMS.. It's sitting in my room and waiting for it...

[mr_g]

I have this problem. Gasoline injectors are High-Z (about 16ohm) and LPG injectors are Low-Z (about 1.5ohm)...

As I understood, I cannot change PWM to non PWM when changing fuel on bifuel support because firmware doesn't support it...

My friend's idea was to implement another ATmega to do the PWM on LPG... My idea was to simply mask off INJ tranzistors when on LPG and add on another 4 INJ tranzistors for LPG with external PWM signal (from outside ATmega)...

Any comments?