Audi RS2

[AVP]

welll i started off with the 1.1.44 and had problems.

went back to 1.1.27 and car is running beautifully.

i think it is vital that VEMS provides a good working and official new version

[AVP]

update:

after having the ECU off for 10 days,as i was away, when i reinstalled it i noticed that even without changing any settings, idle was higher than normal on a warm engine.

i switched the EGO off to see where the lamda was, and it was lean(1.12). I then took the VE bins from 72 to 75 and that helped things a little bit,but i also had to use the idle valve pwm from 16 to 19 in order to bring the idle back down.

After a few drives, i noticed that i was able to go back to my original settings,meaning: VE=72 and idle pwm=17.

Question: Since enviromental factors are not changed all that much and it is not that different, could the fact that the car had been still for 10 days outdoors be the cause of increased humidity in the engine,thus causing a lean mixture that then resolved?

How can vems me setup in a way that can avoid these enviromental changes?

Or , is this something else?

[AVP]

i have setup one of the misc outputs for the evap system.

however it is not able to be setted so that evap can start above 70C or normal operating temperature. Is there a way to do that?

thanks

[rob@vems.co.uk]

You could try using the Water Pump configuration, that gives temperature dependent triggering.

[AVP]

so basically if i use the settings i259 and channel 6, it will enable the temperature function on that setting?

i will try that!

[AVP]

what do i use in 'Hysterisis' ??

[rob@vems.co.uk]

Hysterisis is there to provide a band of operation for things like the fan, without it what you'd get is the fan switching on at the on value, then turning off when the temperature fell below it. So if  you set the on value to, say 70 and hysteresis to 5 it would turn on at 70 and then off when the coolant temp falls below 65.  If you want it to turn off the instant that coolant falls below 70 then use a hysteresis of 0

[AVP]

great! i will try that!

[AVP]

however....

if i use the misc output + the water fan together, will they work under all the settings i use? or will it just open the carbon canister valve above the deisired temp and keep it open continuesly without taking into account the misc settings?

[rob@vems.co.uk]

Don't use the Misc setting, just the water pump one, the two triggers will conflict.

[AVP]

rob, the carbon canister valve should not work above 100pka ,so i cannot use the one water fan output as this would mean that the valve would work under boost and you dont want fuel fumes under pressure on the inlet manifold according to manufacturers.

the valve in OEM systems only operates under vaccum, hence the misc output should only be used then,since the 2 triggers cannot work together.

[AVP]

after a few tests, i realise that because this misc output does not have the ability to give any duty cycle variaton and it just opens the valve 100% the car feels a bit wobbly when i use it on light cruising conditions with TPS value up to 15%. Therefore i will try and only use it under deceleration only which does not affect anything.

[AVP]

question:

Car starts up nicely BUT it is too rich at the first 30sec to 1 min on cold start

settings i have are:

Cranking pulse PW: 12(cold) / 6(warm)
afterstart enrichment: 22%(cold) / 16.1% (warm)
cycles: 102

when i take EGO off, i notice that my warmup enrichemtnts are ok and slightly to the lean side,which i dont mind cause with EGO on,everything is ok.

Should i reduce the cranking pulse or the afterstart enrichment more?

[rob@vems.co.uk]

Don't touch your cranking, that fuel will be through the engine in no time.
An afterstart of 102 cycles will be over in a few seconds (6.8s @ 900rpm)
If I was looking to clean this up I'd set the feedback to be off until 40degrees and tune the fuel with the warm-up enrichments.

[AVP]

when you say feedback, do you mean the EGO correction?