Hi,
My projectcar is a 205 GTI with a 1.9 litre 8 valve engine. I turbocharged it some time ago and am now fully rebuilding/upgrading the engine to suit high boost. Have a look at my project webpage http://www.205turbo.nl
specs in a nutshell:
alloy 1905 CC wetliner engine
16 valve cyl head
Mitsu td05 16g turbo
Tachometer output
I wired the tachometer to EC-18 pin 12 (SPECFET 0) and set the folowing parameters in megatune:
Tachometer channel: SPECFET
Tachometer channel: 0
Tachometer divider: 0
in the help it says:
Most GenBoard outputs is only pulling the output low (0 volts)
If your tachometer wants 12V or 5V signals, wire up a (say, 1kOhm to +12V or +5V) external pullup resistor. Configure Tachometer Divider if you want a lower frequency to your tachometer.
Check out the latest MegaTune release package (mt-r27), it has 1.0.19 firmware which has the tach output working.
> Ok, I have the mt-r27 formware working now, but still no tach output. The strange thing is: I would expect a led to work here. I wired a lef parallel with the pullup resitor but it didn't do anything. Is my logic flawed?
Probably I so not really know how my tachomater works. It used to be connected to the coil (-). But I use a different coil now. (wasted spark) perhaps I'd just hook it up the old fashioned way with diodes?
- Wired it up the oldfashioned way with diodes and works like a charm...
- so your tachometer needs high voltage to trigger.
- One option is the "inductive pullup" as described on [inductor]
- but if the diode trick worked, no reason to change it.
- so your tachometer needs high voltage to trigger.
Staging
I added 4 injectors to my engine. So I now have 4 injectors aiming at the valves and 4 upstream. The secondary injectors are 305 cc and the primary injectors 240 cc.
Configuration:
I configured VEMS to do injector staging.
- rate to calculated pulsewidth (inj_stage2_rate) to 200
- TPS position to 0%
- MAP value to 130 kpa.
Changed the firmware so the secondaries can be larger than the primaries.
I changed the VE table so all values above 130 kpa are devided by 2.
Still have to test. Will come back on this later
OLD / solved issues for reference by other users perhaps experiencing simmilar problems
Megatune showed wrong voltage:
- Only problem is the volt meter in Megatune. It gives 20 volt readings while battery voltage is 13 v.
- You probably missed to calibrate it, adjust battery calibration. Default batt_cal=0xBC (decimal 188) or so
- thanks for that!
- You probably missed to calibrate it, adjust battery calibration. Default batt_cal=0xBC (decimal 188) or so
Ignition problems. Fuel worked but no sprak.
- Publish full config, saved by mcd command.
- Try to compare your ignition related parameters with a working config, such as MembersPage/MarcellGal/EngineSwap .
- As the last chance, start again from the working config, only change what is necessary.
- check again if you missed something from GenBoard/UnderDevelopment/FirmwareChanges
- Eg. make sure secondary_trigger=02 is used ?
Thanks for the feedback! It turned out to be the secondary trigger indeed.
Took it for a drive this day. But the engine ran verry lean (afr 1:16) and it appeared all the tables are ampty somehow in megatune. I had this problem with a more recent firware before. Ans switched to a bit older one that seemed to work fine. But now the tables are empty again. Does anybode have any idea how this could be fixed?
A: There was a ini update on the magatune page.
http://www.vems.hu/wiki/index.php?page=MegaTune
<<This package has bug in ini file causing settings lost when updating to ECU, here is [fixed ini file]>>
The engine didn't start -> no fuel injection.
the pulse width megatune displays is 0 though the crancking pulsewidth is set. And the the req_fuel is set(and all tables are filled with the right values)
A: somehow the decel fuel cut rpm was set to 0 rpm after a firmware update. I set is back to 2500 rpm and it started again.