Audi RS2

[AVP]

Well i finally got my hands on the unit from Marc(thanks)

came with a base map and settings to start with, wide band bosch and EGT sensor.Also he prepared me the diode mode to play with for idle settings.

Going to install the wideband this weekend and make the connections and start the car.

here is a photo of the new vs old ECU.It has the 1.1.44 software version in so hopefully once the new versions are in good working order i will upgrade as they go along. For now,after reading through how megatune works (although being completelly ignorant of these things as my profession is a doctor) i managed to understand most of it so hopefully i will get the rest of the help from this forum!!



Will post vids/photos/logs as they come along

Vasilis

[rob@vems.co.uk]

Install the wideband last thing of all, best to do it when the car is idling, they are robust little units but do not like unburnt fuel.

[audis2turbo]

Hello,
congratulations to your Vems!
Do you have the 1.1.44 firmware and all the config files on the hard drive of an Audi S2 / RS2?
Is that with the 16x14 maps?
I drive the 1.1.27 on my Vems with an Audi S2 ABY.
And I would like my Vems update on the 16x14 maps.

[AVP]

i was told to install the wide band as it is and fire it up. I have also fitted the wideband in a distant location from the turbo at least 30-40cm

i have the 1.1.44 but 12x12 tables

[AVP]

i was wondering today....

i know that with VEMS the board computer that tells you the fuel efficiency/economy does not work(yet). But when you put it on instant consumption it basically gets a reading from the throttle body and it reflects how heavy your foot is.

Is it possible to just feed that information to VEMS and reflect it on the board computer screen somehow,even if it reads the actual TB angle,so that you have some instant information there anyway?

[AVP]

going to install VEMS tomorrow!! yeah!

i think another very usefull feature to use in the future versions would be a simple way to add or retract advance in the spark table depending on IATs. I know it already has a curve of ignition retard depended on IAT, but if you use NOS or water/methanol (on/off) it would be a good and convenient way to be able to do this thing on it's own and become more aggresive if needed.

another thing i have noticed is that my fueling map on my current eproms seems to be most of the time on the stoich side and only during the high boost/high kPa is becoming increasingly rich... however most of the maps i have seen laying around are on the richer side most of the time.

[AVP]

VEMS is on and operational

however it seems that although idle is fine, with settings on cold 1100C and 950C when warm(after 56C) it seems to be holding on at 1100C all the time.

[AVP]

i also noticed on datalogging that in some instances, even with TB closed, i would get some sky rocketing high lamda measurements,without any insight of knock or EGT rise. When i say high i mean as much as 42.5 lamda once!

[rob@vems.co.uk]

Is this when you are idling?

[AVP]

yes

i think it is related to when i give the gas pedal a tap and then it closes down. Is it just the fact that the injectors shut and you get more air in?

[rob@vems.co.uk]

That's the fuel cut coming in.

[AVP]

issues:

1) Idle still stays up even after altering the settings on idle.I
thought i would change the TB damper.Maybe it is too much forward
located. Also On motronic the TB angle is 9.8 on closed throttle.Maybe
that has something to do with it... Any calibration methods from tps?

2) EGTs on warm engine stays @ 580 on hotside,which is quite high,esp.
when concidering that on 900rpm on motronic is 520-530. It could be
related with the fact that the idle is 1100 instead.

3) there is a problem with the accel.pedal When changing gear and on
startup, it seems to become quite rich and for a second the car
stumbles. then once the revs build up it goes better.

4) in general EGTs when on normal driving are a tad higher than normal
for lamda = 1 to 1.02 etc. so im thinking that i should reduce the
ignition timing a bit. what do you think?


how can i post my xls files?

[rob@vems.co.uk]

1) Idle still stays up even after altering the settings on idle.I
thought i would change the TB damper.Maybe it is too much forward
located. Also On motronic the TB angle is 9.8 on closed throttle.Maybe
that has something to do with it... Any calibration methods from tps?

Is there any difference in idle speed if you disconnect the IACV?

2) EGTs on warm engine stays @ 580 on hotside,which is quite high,esp.
when concidering that on 900rpm on motronic is 520-530. It could be
related with the fact that the idle is 1100 instead.

50deg is not a huge amount - are you using the same EGT meter to test this?

3) there is a problem with the accel.pedal When changing gear and on
startup, it seems to become quite rich and for a second the car
stumbles. then once the revs build up it goes better.

This is acceleration enrichment, and will need tuning.

4) in general EGTs when on normal driving are a tad higher than normal
for lamda = 1 to 1.02 etc. so im thinking that i should reduce the
ignition timing a bit. what do you think?

Retarded ignition results in higher EGTs, you really need to start tuning and see what the differences are.

how can i post my xls files?

http://195.159.109.134/vemsuk/forum/index.php/topic,113.0.html

[AVP]

1) My idle is ignition based so the ISV valve is disabled is that is what you mean

2) this is measured with the same EGT sensor on the turbo hotside. The EGT that goes to VEMS is further back and im still trying to compare values. i get from 200 to 150C difference so far

3)when you do have that symptom, what is the first thing to change?

4) my timing map is quite high on most areas.Is it possible to have gone to the other side?

[rob@vems.co.uk]

If the idle is ignition based then its going to retard a lot and that will increase the EGTs.

Tuning acceleration enrichment is tricky to describe - hopefully someone else may try to give it a shot.
You need to start looking at the datalogs and seeing the effects that changing the enrichment amounts, nothing beats experimentation and learning from the data.