Teppo Kalske from Finland, born 1972
My daily drive is a 1986 VW jetta into wich I couple of years ago transpalnted a full 16v drivetrain. Used it for about a year until head cracked. Then it was quite natural to take engine to pieces and make a total rebuild wich included 1,5mm oversize piston and getting rid of CIS to make place for Megasquirt.
After 7 months of driving with MS Miska talked me over to swap it for VEMS. Main reason was internal UEGO for WB-lambda.
Specs:
- 1.85L 16v (4syl), 136Hp stock + tube header, base engine KR, with ABF intake and very light (3,5kg) flywheel
- 4 cyl fuel injection, Hi-Z injectors about 200cc, INJA, B, F, G
- Ignition with distributor, IGN03
- PWM controlled idle valve, INJE
- 1xWBo2
- trigger from hall in distributor, 1 pulse/cylinder
- Running with firmware v12, vemsv3.ini r017
Shopping list:
- 1 x GenBoard v3.2
- 1 x Econoseal36-PCB
- 1 x Econoseal36-Wire
- 1 x Econoseal18-PCB
- 1 x Econoseal18-Wire
- 1 x Alubos1600
- 1 x Alubos EC frontplate transparant
- 1 x Alubos Endplate transparant
- 2 x Alubos gasket
- 9 x FETs Injector driver, WBO2 heater driver (FQFP..)
- 5 x Ignition driver (IGBT)
- 1 x Ignition driver insulator sheet
- 1 x 2.5 bar MAP sensor
- 1 x Wideband connector
5.10.2005
Yesterday I tried more different idle settings got it much better. Main key was to change "max steps to extend"-value from 80 to over 100 or even 255. After that idle stabilation worked perfect and not a single case of engine dying when lifting foot of pedal.
BUT one problem came up: After start IAC opens to about 78% for couple of seconds causing 3-4000 rpm idle. I tried to change all the after start settings to 0 without any affect to this problem. Any ideas?
- please post your config.txt
- Here are two dumps from this morning. 1st is with fair idle and after start. 2nd with perfect idle and big after start problem
29.09.2005
Copied this page from [here]
Due to the too light flywheel I'm having quite a head ache with idle setup. For last 5 months I've been trying infinite number of various idle settings and never seem to get a setup wich works in all engine temps. Main problem seems to be with warm or almost warm engine. Ecu starts Idle stabilation too late, after revs drop under idle rpm setting that is. Due to light flywheel revs drop so fast that enigine dies before ign. adv. and isv changes have any effect on it. Has anybody any hints?
On the shelf I have 4 audi 1.8t COP:s waiting (06B905115L) and a vag-original wiring harness with plugs for those (1J0971658L) wich costs only 38eur in Finland compared to 16eur per each plug housing.
Main problem is that I haven't had the time nor energy to install trigger wheel nor hall...
14.06.2005
Idle is now close to perfect with cold and half-warm engine. Also previous RPM undershooting (RPM falls down to ~500rpm when releasing throttle rapidly from high RPM) problems are gone. The trick was to set IAC ref position table a few steps over needed values and limiting iac_integral_limit_dec to very small value.
With warm engine there is still a problem with rapidly falling RPM. Ref position table ends to 77C, does this affect to all temperatures above 77C?
07.06.2005
CLT and MAP readings are incorrectly, at +7C outside temp after night CLT says -16C MAT -6C. Incs are generated using EasyTherm using 2k7 bias resistor and following measured values:
100C, 350ohm
23C, 5400ohm
0C, 16000ohm
and
100C, 343ohm
6.4C, 12600ohm
-16C, 37300ohm
Note that resistance is appr. double compared to standard GM sensor. This is not a problem, just good to know.
Generated thermfactor.inc is [here]
Verify that inc file has following "firmware_temp_value" at given "adc" indexes:
- adc=29.26 firmware_temp_value=252 temp=100 celsius_or_fahrenheit=C ohm=350
- adc=170 firmware_temp_value=113.4 temp=23 celsius_or_fahrenheit=C ohm=5400
- adc=218.18 firmware_temp_value=72 temp=0 celsius_or_fahrenheit=C ohm=16000
- adc=28.74 firmware_temp_value=252 temp=100 celsius_or_fahrenheit=C ohm=343
- adc=210 firmware_temp_value=83.52 temp=6.4 celsius_or_fahrenheit=C ohm=12600
- adc=237.79 firmware_temp_value=43.2 temp=-16 celsius_or_fahrenheit=C ohm=37300
These were made with firmware/bin/therminc.pl (in CVS head).
(TODO: complete it to make complete inc files, and publish some inc files with different resistor values).
If the AVR AREF reference voltage and the pullup voltage are significantly different (they should be roughly the same, appr. 4.86V .. 5.05V. Easy to measure with just endplate off) that would explain things and would be easy to make an inc for.