Sub page for MembersPage/SteenAndersen
My Progress status
This page should describe my progress, only current status here, old status moved to MembersPage/SteenAndersen/History
24 Apr. 2005
I have come a little further this week.
Assembled the GenBoard in it's AluBoss box. A little difficult to get celarance between the clamping plates and the EC connectors soldering pins, i had to cot them tight to the PCB. I also had to make holes in the endplates for MAP, and signals. I used a DB-15 pin connector for wiring to LCD, RS232 and PS2, i even got room for 2 wires for S259_OUT1 and S259_OUT2, so i have them for future use.
I put some wiring into the car and put in the WBO2 sensor in. Connected GenBoard to Vbatt and GND (GND5 and GND shorted internally in VEMS). I hoked the TRIG1 signal to the tach signal going to the tachometer (unsoldered R30 according to Marcel recomdation), but i had to use a capacitor between the tach signal and the TRIG1 (i used 470nF) to get a RPM reading. The RPM radings at idle is fluctuating a bit +/- 50 rpm, but it could be unstable idling, but my multimeter is reding a steady rpm, but it might bebecause of slow reading.
WBO2 redings
I tried a little run in the car, and watched the reading's, especially the lambda was interesting. When cruising L was around 0.92 +/- 0.2, and on full throttle down to .84 (there is vacuum connected to the fuel pressure controlled by the warm up regulator), on deceleration lambda raised into 1.1 range, so it seems tuned OK running on the old CIS system.
On cold idle the lambda seemed to high around 1.2, and the engine is struggeling to keep a smooth idle, and rpm is suffering, but that could be explained by the lean reding.
I'm not sure if i can thrust the lambda readings, but if the readings is right it show's that the CIS is to lean on cold idle, but OK at cruising.
The readings also fluctuate some on the LCD, but i supect thats the PID parameter setting for wbo2. II'll put config and tables on the MembersPage/SteenAndersen/MyInstallation page. Beware not all parameters is configured yet.
MegaTune
I downloaded the release candidate 007 from teh MegaTune page, uploaded the firmware to vems, and voila, instant success. I used megatuneto adjust batt_fact to match Vbatt reading to multimeter readings. I tried to have it running during a test run, and it show the reading nicely. In the realtime display i could see the %02 readings at 2.5% that matches the ritch setting that the car like, and the lambda reading's . The rpm seemed a little coarse at idle, it was jumping in 100 rpm step's.
MAP
I'm not sure what the reading should be, and i'm not sure about the kpafac adn kpaofs setting, but i adjusted in megatune so the map reading was 103 when barometer showed 1030 hPa. In car running the MAP goes from 10 on deceleration to around 60 on acceleration (not sure if the readout in LCD is in HEX, if so MAP=64 is 100 decimal and seemes OK on acceleration at WOT).
To come
I have to hook up some more connections to IAT, CLT, and find out how to configure for acceleration enrichment using differential MAP, instead of TPS ,since i have no TPS on the 911. And if possible i like to have a PWM controlled output to control a frequency valve in the CIS system (it a 15Hz duty cycle controlled valve in the CIS fuel system, that controls back pressure, and the the amount of fuel delivered.) That's for a cheap start, so i don't have to change the injection system yet. (no money situation).