MembersPage/GerbenvdLei (2006-05-28 17:59:52)

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?


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.

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:


Ignition problems. Fuel worked but no sprak.

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.