This page seems to mix multiple projects, please split to avoid multiple projects per page (and any resulting confusion) (also: use thematical organization, not chronological)
this is NOT multiple projects, just ONE car with various upgrades over the year, in conjunction with VEMS upgrades
Audi RS2 Avant
Engine:
2.2l
Mahle pistons
scat rods
GT3071R turbo (0.63AR)
OEM inlet/exhaust manifold
custom intercooler/downpipe
water-meth injection
70mm catback with x2 200cpi BN pipes catalysts
Stock cyl head with stock ADU cams
Spec 3+ clutch kit for dual mass flywheel
running VEMS with megatune 1.1.27 for 9 months now!!!
Results with Perfomance box: around 410hp with 1.85bar overb. and 1.7-1.8bar steady to redline on 4th gear pulls.
Max torgue reached: 600Nm, but keep it around 580Nm now.
Next year:
Holset super HX40 with 0.70AR
reverse inlet manifold
SQ exhaust manifold
New downpipe
Issues:
Idle control finally solved but always small modifications for fine tuning. I use diode for ISV valve and a combination of ignition based idle and IAC intervention to keep idle steady and allow minimal play when fan kicks in or A/C is working. So far im very pleased with the results
Version 1.1.27 is very stable but would like to switch to 1.1.62 with vemstune.I managed to connect the laptop to ECU on 1.1.27 with vemstune. I will wait for the 1.1.63 version which has the boost control bug fixed, as i use vemstune to control boost with an industrial solenoid valve. Very accurate boost control!!!
15/11/2009
Removing the MAF from the airfilter caused some overboost cut outs for some reason and i had to adjust the boost control figures. Noticed that the offset feature will not accept value 15 on 1.1.27. It will only go from 16 to 14, although when i did save and burn to ECU the value 15, i did notice a change in the highest boost reached.
13/12/2009
After more tests, i had to reduce the boost offset to 12 and redo the boost control vs rpm in order to avoid fuel cuts as it was spiking. But everything seems to be working fine now. I do get a bit of drop in boost on higher revs, but i dont mind. it is minimal,and maybe required as well.
The idle has been altered a bit,but here is a video of how it works now. I am really pleased,and the only thing which has been posted before about A/C control and idle is the one thing that can possibly make it even better.
http://www.youtube.com/watch?v=JR13Wx9h2-0
Marcel has my settings and can work with them or improve them,but the way they are now, it is working quite well.
Car is making about 420hp and 620Nm of torgue.
08/2010
car now has:
SQ exhaust manifold
New downpipe
GT3076R turbo, 0.82AR
reverse Wagner inlet manifold
220psi water injection pump
7A flywheel and southbend clutch kit
Car now produces around 500hp
Im still using 1.1.27version of megatune as Vemstune still gets upgraded every other week and there isnt a version yet that can utilise boost offset feature. Im planning to upgrade to a later version of vemstune as soon as i feel that it is stable and working nicely.
So far im pleased with the results from the car and i drive it everyday!
TODO: cleanup this and add vemslog
Pasting some info from mail from Vasilis:
- I have used now the lower DC as 29% so that it does not allow the IAC to open more as IATs get higher, and that seems to work also.
- I will put a link to a log i have had recently, im not sure that it will show excactly the behaviour though
- it is improved now that i have the TB slightly modified. it is mostly the fact that the idle tends to become higher when IAT gets higher, but i think that has to do with the integral limit decrease.
IDLE: (1.1.81 firmware now).
i used the following method to tune idle speed:
Ignition based idle: DISABLED
integral limits: ZERO
cold start the engine and set idle ref DC
I use for the bosch 2pin IAC valve: 35hz and limits of 0 and 100% DC
I managed to make the ref DC table close to my cold and warm idle speeds using the IAC control alone.
Problem: Once IAT starts to go higher than 25-30C the idle speed goes UP!!!
I have disabled the refpos for MAT slope feature completelly and it still does it!!
with ignition idle settings enabled i end up having something like: 1050-1080rpm idle speed on CLT:83-85.
If IAT is anything between 0-18C --> idle rpm is 940-970 (which is my target rpm)
On the bosch valve and with the above settings, any DC below 28 on the refDC table, makes the idle speed HIGHER!.
So setting the integral limit more than 20 takes the refDC below 28, and the idle speed goes higher!
my refdc table has the number 29 for refDC from CLT of 70 to 90C.
- a vemslog before i did the change to the TB.
In the log in Idle mode the minimum was 839 RPM, can you excactly show your problem?
- Could you post a log file with high and low MAT, so we can investigate why idle speed goes up
Do you use ego-correction? I`ve seen simular problems with ego correction off, and I would have to modify the MAT/TPS table at 0% trottle. That was related to an MAT-sensor heatsoaking issue, causing lambda to go lean and rich after different tempratures. -reidar
--
thanks for the answer, i do use EGO correction and have some heat soak issues for which i used a phenolic spacer which minimised the problem. However according to some tuners, if the IAT goes higher, the idle usually drops, it doesnt go higher, which is why mine does the opposite for some reason.
I have now modified the TB a bit and i get a bit better reaction, so im happy with it.
Tuning cruising lamda and ignition:
may i ask what is the optimal that tuners have used for the areas:
2000-4500rpm
50-120kpa
compression ratio: 9:1 and fuel: 97 octane
what lamda and what timing?
I am struggling to get good fuel economy on my car. I know i should have gone to a dyno and did the proper thing, but id like to know what other people use for the time being.
i can tell you why idle speed goes up when MAT goes up.
integral degrease limit tries to keep idle speed low when the MAT goes up(as idle goes up with it if IAC is off completelly, i dont know why), sometimes its only the IAT sensor heatsoaking probably.
if integral degrease limit takes the IAC DC below 30, then the audi IAC goes into its safe mode which from factory means that it starts to open again instead of keeping shut. For audi IAC, 30% DC is the completelly closed position. So as integral is taking the DC to lower levels (for example 25% or 20%, the idle speed goes high.
Try it in an audi with this mechanic IAC valve and you will see that if you use DC of 20 or less, the idle goes higher. WHich is why i set the lower DC limit to 29 so as the idle to try and stay as stable as possible.
22/9/2011
The engine is rebuilt with new pistons (oem mahle 81.51), ported head with larger valves, higher compression than 9:1(probably closer to 9,3:1), southbend clutch kit full feramic.
I replaced the injectors (siemens deka) with EV14 650cc.
I have the simplified dead time values from the shop:
8volt 2.55ms = 2550us
10volt 1.70ms = 1700us
12volt 1.20ms = 1200us
14volt 0.92ms = 920us
16volt 0.75ms = 750us
Apparently when i use these values i get another validation error from VEMS, although they are the correct spec from the shop they tested them.
Vems help says that i may get very low values on the VE table around idle. Other than that, is there any other reason i would worry about this new validation error, or should i ignore it?
Above values seem OK, validation values are too strict, we'll change them, Ignore the warning for now
04/12/2011
Car now has been fully mapped and water injection is back online after a faulty controller. Looks like it may be spraying too much mixture (70/30) but ill need to keep logging to see the results and if the lamda becomes too rich robbing off some power.
I still get secondary trigger errors above 6800rpm. I use a 7A flywheel with a larger welded pin, as VEMS was not able to 'see' the OEM pin on the flywheel. It doesnt misfire or anything, but its annoying, as the rpm above 6800 jump around and cannot be logged properly by VEMS.
Unless this gets fixed in future firmwares, i would advise a 60-2 on audi I5 engines to make them read properly
Car is now producing around 394whp and 380ftlbs on the virtual dyno runs, done by using VEMS logs. When i compared these dyno runs to a dyno-dynamics dyno i was recently on, they were pretty accurate if you input the weight and frontal area of the car, as well as the gear ratio. On dyno-dynamics i had 368whp with less boost and higher IATs. A comparison between the same excact run on the dyno-dynamics and virtual dyno was:
315whp dyno dynamics (with 30C IAT) vs
330whp on virtual dyno (with 10C IAT)
Here is a 4th gear pull:
Wheel speed control is still not working and i assume i would need a hardware change for that, but boost control is acceptable on all gears now, so i dont mind.
Vasilis
18/2/2012
After a few improvements on the boost settings the curve now is much better and boost builds up quicker. I could try a faster N74 mac valve(4port) but i think its not going to be all that different.
As EGTs get higher after 6500rpm, i have reduced the boost thereafter, and now the car makes more power than before,as full power seems to be there up to 6400rpm.
here is an example of the boost improvement:3d gear pull
PID settings are very car specific and therefore need tuning from zero. No settings from someone elses car will work 100%.
Also, cold starts are faster as well with new IAC cranking DC updated!
Vas
5/4/2012
A few adjustments on the settings the last few weeks include:
1) A fix of a weird idle fueling issue which allowed on hot engine, high MAT the car to become VERY rich if MAT/TPS stayed at 100, and once fuel was drawn away with the table, going down to 90 from 100, the car 'felt' lean. Checked lamda, settings etc and replaced the car's battery in the end. Result is getting the car to behave again by showing that heatsoak is creating a lean mixture when MAT is high and fuel needs to be added rather than subtracted.
2) Replaced the N80 valve and trying to figure out a testing procedure through VEMS as it seems that it doesnt respond although new, and once 12v is given to it, it reacts. Settings are in place for it to work on deceleration only, but need to make sure it actually works. This valve is CLOSED once 12v is applied and OPEN when no power goes through it.
3) Fixed a small issue with rich mixture being caused by EGO riching up the mixture after deceleration and once rpms reach idle speed, as it tries to enrich a closed fuel supply and lamda of 1.29 causing a rich mixture whith took about 10sec to go back to normal lamda, and obviously made the city driving quite high in consumption!! Beware of your EGO settings for this, as it will make the car very uneconomical.
Awaiting of a pressure valve to see if my A/C will be fixed and if so, do the final testing of idle speed with the A/C being on. I have already tried this on a friends RS2 which i tuned a month ago and it works brilliantly. At last idle speed without issues!
27/7/2015
please use this link to get config for updating to new ECU
https://www.dropbox.com/s/m6jy3pfgd2pov2x/HTA12A.vemscfg?dl=0
MembersPage/VasilisP/WideBandDiagnose
2017-05-18
I would like to incorporate 2 features on my latest ecu :
- what type ECU ? Econoseal ? AAN ? Is it sent out ? or just ordered ?
- What is ECU serialnr ?
- what extra inputs and outputs do you have according to your ECU paper ? (or your measurements) ?
1) I have in the aux outputs on my config settings to operate the n80 audi valve for recirculating the fuel vapors from the engine.
- the "EVAP valve", right ?
- My ecu currently doesn't have the ability to operate the valve. I'd like this valve incorporated in the ecu functionality.
- what is the resistance of the EVAP valve ? Maybe you have extra output that could control if enabled in config ?
2) I would like to have the option for the AC feature from firmware 1.2.38 which as I understand I would need to somehow connect the 12v signal from the air con compressor to be incorporated to the ecu in order to use the settings to control the idle.
What should I do?
- create separate pages for the 2 subprojects (even if they involve the same ECU) and make some measurements, planning, research
- use clearer terms. Maybe you mean "connecting the AC 0/12V signal to a protected analog input of the VEMS ECU" (instead of "incorporated") ...
- if not absolutely certain about mcp3208 analog input being protected, it is recommended: use a 4k7..10k resistor
- and a diode anode on ECU input (diode cathode on 5V for protection)
- or a 5V1 zener with cathode on ECU input, anode on GND
- or drop the idea if you don't care to do more systematic planning on it (there is some chance a working system gets messed up if modifying without being sufficiently prepared)
Marcel,
As I have told you before, I do not possess the knowledge to make such changes as you describe. You know what the ecu has from hardware, and since the AC feature was done only recently and requires more than just a config setting, that is why I inquired about it.
It seems that you are more interested in the words I use to ask for a feature rather than the actual feature. It may be annoying to you, but you have to understand that not all VEMS customers are developers or professional tuners and you should keep this in mind when questions are asked.
It seems to me that I am possibly wasting your time.
the EVAP valve is the one in question.
its under misc output 2 settings channel selector I259 channel 7
Under output channel setup, misc 2 has: ignition output 7 (7A)Grounding EC36, pin10
When i test the output, the EVAP valve does not operate. Hence my thought of this actually not been added when the ECU was made.
AC control:
according to your vems page for Idle control, all i require is to have the feature which increases the idle speed once AC clutch kicks in so that my idle doesnt drop or stall. Believe me i have messed around with idle IAC settings probably more than anyone else and there are occasions where the idle still drops and stalls. SO for that reason alone, i would like to make use of this feature which i believe to be very important for my car.
I do NOT know what my ECU would require to make it work as again i am not an electrician. I am happy to pay for instructions and delivery. Simple as that.
If you do not wish to help, then please direct me to someone who can.
By the way this system of pages is so old and complex that i do not understand how to make subpages of a page.