MembersPage/GerbenvdLei (2006-03-16 04:43:08)

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


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 about 140% of the primary injectors.

Configuration:

I configured VEMS to do injector staging.

-snip from http://www.vems.hu/wiki/index.php?page=GenBoard%2FUnderDevelopment%2FStagedInjectors--

config.inj_stage2_rate - Secondary injectors firing pulsewidth rate. Give it in 0.4 percents relative to primaries. Because a typo now 0x00 means 100%, 0xFF means 200%. (Will be corrected soon to 0-100%)

-snap--

This means if my secondary injectors are about 140% of the size of the normal injectors. I would have to use: 0.4 * 140 right?

But when te engine reaches 120 kpa is stalls. So I tested it with min MAP @ 1 kpa and the secondary injectors are fired but it seems the primary pulsewith is not reduced i.e. it runs VERY rich when firing the secondary injectors.

You mean the primary pulsewidth is not reduced compared to MAP = 0.5 kPa ?

indeed. It SEEMS the primary injectors are fired at the same pulsewidth even when the secondaries are fired. With the secondaries diconnected the car behaves normal. (does not lean out above the set kpa) I will have a try tomorrow with the primaries disconnected and the secondaries connected.

1kPa threshold does not seem reasonable.

I just used the 1kpa to see if the injectors are fired at all. And to do some testing while the car is idling.

I have the secondary injectors on channel 7 (ie pin 17) and the primary injectors on channels 1-4

Anybody suggestions?


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.


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.