Successful conversion to VEMS Genboard 3.2 on my race spec 1985 VW Golf.
Pictures and some info:
http://proton.shadowflux.com/vwracing/
http://new.photos.yahoo.com/jerrysno1kid/album/576460762327171850#page1
Email: james at shadowflux dot com
6 Nov 2006:
Firmware r045
Wideband calibration troubles
With the trouble MembersPage/KoabiBrooks has had with calibrating his WBO2, I thought I'd double check mine to make sure it was accurate after the two seasons of running in the car. Sensor was originally calibrated with sensor screwed into the exhaust pipe. This may have caused some inaccuracies. Attached LCD, unscrewed WBO2 sensor from exhaust, changed to mlp07 to show WBO2 info, and used Manmde02 to start sensor heating. Once sensor was heated, pump went all the way to 0xFF and stayed there. Heater oscillated a bit, so I tuned the PID control to keep heater between 0x90..0xAF. Measured sensor temp with infrared temp gun, stayed in the 200+ deg F range.
LCD display example:\nÿ1ÿ
"Ri" varied but stayed stable.
"Nerst" varied only in the last two bytes. First two bytes always read "07".
"Pump" stays at FF after sensor has left warmup mode.
Bottom AFR stayed at 13.95 until I started the engine. With sensor still outside of exhaust pipe, bottom AFR varied between 14.1...15.0.
Is the "??.?" supposed to be the O2%? I saw O2% on mlp02, but the value never changed from "??.?" at any point during my testing. I tried several times to start and stop the sensor heater.
What is going on here? Is this sensor dead? Where is the 02% supposed to be observed for calibration?
Still waiting for the radiator hose so I can do on-road testing of trigger settings.
13 Oct 2006:
Current problem is premature rev limiter engagement at 6500 rpm instead of whatever max setting is. Not using soft rev limiter, min_crank_per set to 768 (9700rpm). I need more than 6500 rpm!
Maybe related to rev limit malfunctioning:
Realized that crank trigger settings were off quite a bit. tdc_after_trigger is only 30 degrees instead of the recommended 60. trigger_tooth is currently set to 7. Next test session I will change trigger_tooth to 4 and increase tdc_after_trigger to 60, then fine tune with strobing timing light. This is all after I fix the burst coolant hose of course =/
21 Oct 2006:
Made above changes to settings. Engine started and revved okay, but I didn't have a chance to drive it because of the coolant hose. A new hose will be ordered this week. No hurry since racing season is over.
Config
Latest/revised comments config: MembersPage/JimW/Config
Notes about subsystems (to verify/justify config variables) on pages below
- MembersPage/JimW/FuelSystem
- MembersPage/JimW/InputTrigger
- MembersPage/JimW/IgnitionOutput
- MembersPage/JimW/AirFeed
- MembersPage/JimW/Wiring
- MembersPage/JimW/Sensors
Engine:
- 1.8 liter VW 4 cylinder from 85 GTI
- 10:1 compression
- Stock components
- Solid lifter 8 valve head, code JH
- Ported/polished
- Euro cam
- Bosal/Brospeed tube header, 2.5 inch exhaust
My Genboard and LCD display:
Future Plans:
- Add relay and switching gear to properly set up launch and shift control.
- Add EGT sensor and hardware if necessary.
- Change connector on endplate for common DB9 cable fitment.
- Change over to standard GM IAT sensor for more accurate readings.
- I'm sure I'll find something else to add here.
Notes:
While browsing the net I came upon this thread about someone using 034EFI on their turbo VR6 VW Golf. The 034EFI setup looks very nice. The thread is located at: http://forums.vwvortex.com/zerothread?id=2470106&page=6
An AMP round mil-spec connector option would be nice for Genboard.