Alpha test: trigger return dizzy

teg · Post by **teg** » Sun Aug 26, 2007 10:35 pm

Today morning was first "cold" morning after summer when battery voltage was lower and I had first problems to crank engine. First try engine started but felt like it would only fire half of cylinders (as it does when RPM sometimes shows half of actual). Second try was ok.

Maybe false trigger limits (1.0ms and 8%) are incorrect? Should false triggering be turned off during cranking when using trigger return?

teg · Post by **teg** » Wed Aug 29, 2007 2:28 am

There is something odd happening when cranking. Sometimes it takes second or two (few triggers) before fuel pump starts.
And sometimes it starts and then shuts off and starts again - very quickly.

teg · Post by **teg** » Wed Sep 05, 2007 12:58 am

One problem (or I would call it bug) is that ign_reset() will turn off fuel pump. When in trigger return mode, pump isn't on (or it hasn't created enough pressure to fuel line) when first trigger return occurs.

Post by **jsmcortina** » Wed Sep 05, 2007 12:57 pm

Doesn't the pump run when you first turn the key? (Ensure you have a priming pulse defined)

James

teg · Post by **teg** » Wed Sep 05, 2007 10:05 pm

Yes it runs but stops immediately when first trigger occurs.

EDIT: Or I'm not 100% sure if it is FIRST trigger.. It might be second or third or so.

teg · Post by **teg** » Tue Sep 11, 2007 7:43 am

Does pulse skipping affect also in trigger return mode?

GintsK · Post by **GintsK** » Sat Nov 17, 2007 3:45 am

Hello!

Does anyone have real success with trigger return???

I have Bosch dizzy with evenly windows. 4cyl VW watercooled Rev2.0b9. I get it working on trigger return only after switching on advanced false trigger method and lower percentage mask up to zero. On standard setting there is half or no rpm. Even on stim with ideal input pulses.

Engine get firing with delay. Is it possible turn off skip pulses function?

And when my Rpms go over ~4200 starts something erratic with ignition angle - engines power fall imedeantly.

I was thinking this is because wrongly typed angle between trigger and trigger return. But then I check same msq on stim with precisely measured angles on input signal - the same. looks like half of sparks is retarded hardly above ~4200Rpm.

Same msq on basic trigger I use everyday. No issues above 4000.

Between all there is something like missing injections or sparks at cranking. Probably erratic coil controll - D14 blinking with irregular intervals and dwell. Even on stim. So in general cranking is much longer than expected. Whatever cold or warm engine. And I can't find what settings can improve it.

Here is cold sesion. And again i put back my old MS1-E chip with no single other modification. Trigger return works awesome. Engine starts momentary! Just turn key - it starts. I even try it with really weak battery. Unbelievable - got it running! About on second/third slooow crank rotation. Cold engine!

I want see the same quality from MS2-E too. Did someone have suggestions?

Gints.

Post by **jsmcortina** » Sat Nov 17, 2007 11:54 am

I've yet to do some debugging on trigger return. I know I tested it when I first created it in the 2.0 codes but when I looked a week or so back I agree that it appeared to be behaving oddly.

James

teg · Post by **teg** » Sun Nov 18, 2007 1:35 pm

As I have reported, it will turn fuel pump off after first trigger return. It will take about 2-4 triggers before it turns pump on again.

GintsK · Post by **GintsK** » Sun Nov 18, 2007 3:22 pm

teg wrote:As I have reported, it will turn fuel pump off after first trigger return. It will take about 2-4 triggers before it turns pump on again.

Just try it. Yes. Pump is off and during this time there is no sparks and injections too. If I put very low cranking Rpm on stim, spark LED after starts blinking regularly. If Rpms are higher - closer to normal cranking rpms 180-220, then after pause spark LED starts blinking irregular making long dwell periods too.