Vems Carbon canister freq valve

[A80Avant]

haha
why would i mind? if it works by all means, use them!

I am not a tuner, so if i want to post some settings that work for me i do it.I dont hide them. That is what 'was' nice about VEMS, until recently.

[Jamo]

Then if you don't mind I will be using the same settings

[A80Avant]

correct. these are the settings i have on the misc output

[A80Avant]

i think so, i have to see when i get back to my laptop at home.

will update

[Jamo]

Ah yes I see on ouput channel selector I259 output channel1=6

Do you still use these settings?

min rpm = 2200
max rpm = 4000
Max tps positon = 3%
Maximum manifold pressure = 80 kPA

[A80Avant]

it works for me using the misc output and on overrun only. no problems so far, and getting some use of the system

[Jamo]

Does this work? and if so what injector output was used to control the EVAP valve?

[GazzaG60]

the carbon can wont require a catch can. its petrol tank breathing. also ask yourself is the carbon still working after all this time

the line from the tank can be fitted with a little filter and tucked away. no filter required really. dont block the line the venting helps.

block all the vac ports on the manifold with pipe or buy some of the vac blockers from the stealer for diesels. remove the extra mess in the engine bay.


the whole system is to burn off a little more and be more environmentally friendly. the fact we run higher hp, bigger exhausts, more fuel etc means we have more than exceeded any benifits we were doing. tree huggers pedal bikes after all and id expect boil the designer of S cars in h2O

[Bram]

So what you are saying is remove the carbon canister freq valve and put a catch tank in between somewhere? That sounds like workable to me. Should there still be something that vents the sump some how?

[GazzaG60]

just thread the pipe into the wheel arch.

the vapours are not enough to upset the mix in the scheme of things. you would be talking less than 0.01lambda id expect.

the theing that may affect it is the vacumn change..

just rip the fecker out. what benifit is it doing trying to make it work. i can see the challenge prospective to it but there are a lot more worthwhile challenges on these cars.

[A80Avant]

i think i have seen that pipe being there already,hence if the valve is not working,the fumes have a way out.

i have definitelly seen one on older audis again from 1994

[Bram]

a small update on this.

unfortunatelly, since vems does not have the ability to modulate the duty cycle of the valve, it appears that it works 100% on the specified settings.
thus, when i use TPS up to 15% operational valve, the car goes a bit woobly on low speed in town cruising.

Therefore i have decided to go for only vaccum use of the valve, hence 0-2 TPS values and low kPA so that it only opens up completelly on deceleration.At least that way some of the fuel fumes buildup will be burnt.

However,i think our tanks must have a small tube that allows fumes to go off anyway, as if not, all those cars that disable the valve due to aftermarket ECUs, would eventually or potentially have a major problem, right?

You could make a pipe that dumps it below the car maybe?

[A80Avant]

a small update on this.

unfortunatelly, since vems does not have the ability to modulate the duty cycle of the valve, it appears that it works 100% on the specified settings.
thus, when i use TPS up to 15% operational valve, the car goes a bit woobly on low speed in town cruising.

Therefore i have decided to go for only vaccum use of the valve, hence 0-2 TPS values and low kPA so that it only opens up completelly on deceleration.At least that way some of the fuel fumes buildup will be burnt.

However,i think our tanks must have a small tube that allows fumes to go off anyway, as if not, all those cars that disable the valve due to aftermarket ECUs, would eventually or potentially have a major problem, right?

[A80Avant]

after a quick ride i couldnt feel any difference with these settings so far. I may increase the TPS value a bit just so as it works a bit more (if needed)

[A80Avant]

After reading a few things about the EVAP system i realise that this basically have a general effect on richness to the mixture which on our cars, is only done during closed loop condition as the narrow band lamda can only handle that. Also it is done under vaccum and not boost as Paul mentioned for reasons being that there is not any problem with premature igniting of the fumes being under pressure.

So i am going to be testing the next few weeks this following setup:

With VEMS i have used settings of:
RPM: 1800-4000
TPS: 0-10%
kPA: 0-80

im not sure how VEMS will control the valve, but i gave these conditions in order to be operational.

What i presume this will do is that

1) it wont affect idle(becoming more rich) as it is set to work above 1800rpm
2) during cruising and vaccum the fuel fumes will be entering the IM thus making the mixture richer BUT on wideband lamda control the mixture will be brought back to normal
3) Under boost the valve will be closed (even sooner than that)
4) on deceleration fumes will be entering the IM.

im going to post any findings soon