shug
Part of things
Posts: 34
|
|
Jun 14, 2015 11:50:05 GMT
|
|
Got a megasquirt MS1 from extraefi plugged in my A series manta, running a 2.2 CIH from a carlton. I've been battling trying to get it running right, and am kinda stuck now. Hoping someone can throw suggestions my way to get out of the rut!
It cranks, and fires. Will not idle. If I put on throttle (about 4%) it'll run. Anything below 1300ish rpm it runs like a bag o spanners, and will stall if throttle goes below 2% (rpm gets more erratic under 1300 rpm)
I have an Innovate LS2 on, but the readings from lambda go a bit nuts. Fluctuating from 13 up to 22. Graph looks like a profile of the alps. Above 1300-1400 rpm it runs ok. Will rev up and roar its little head off, but its the lower end I'm struggling to get sorted.
I've tried reducing the fuel as it was running a bit rich, only to hear it pinging away and the lambda in a rare moment of lucidity suggested it was far too lean. Struggles to start with a lower fuelling. Have to clean soot off plugs regularly. No sign of wetness on them.
Should say, I started out with a generated fuel map using tuner studio.
Ignition is hall effect distributor, with standard ignition module. All seperate from megasquirt, with a coil signal to the megasquirt. No crank sensor or anything. Retarding the ignition anymore causes the engine to kick back and wont start.
Pretty please help save my sanity.
|
| |
Last Edit: Jun 14, 2015 11:50:27 GMT by shug
|
|
|
|
Midas
Part of things
Posts: 515
Club RR Member Number: 14
|
Megasquirt MS1 issuesMidas
@midas
Club Retro Rides Member 14
|
Jun 14, 2015 11:56:13 GMT
|
|
Could your injectors be too big for decent low end running?
|
| |
|
|
shug
Part of things
Posts: 34
|
|
Jun 14, 2015 12:05:52 GMT
|
|
They are the standard injectors for that engine. Had them cleaned and tested.
|
| |
|
|
goldnrust
West Midlands
Minimalist
Posts: 1,887
|
|
Jun 14, 2015 12:15:52 GMT
|
|
Has the ignition system run on this engine without problems before? I know you said it's a standard system, but 'pinging' at idle/light throttle, no matter aha the air fuel ratio is rare without ignition timing issues.
Ruling the ignition system out for a moment….
What firmware version of Ms1 are you running? Are you mapped speed density or alpha-N?
While you're trying idle, what are your injector pulse widths and duty cycles? Whats the dead time set to? What sort of VE values are in your fuelling table at the idling cells?
|
| |
|
|
shug
Part of things
Posts: 34
|
|
Jun 14, 2015 12:31:00 GMT
|
|
Had the ignition system running fine before. Used to have r1 bike carbs but ditched them because they were a pain. Really not suited to this type of engine.
When I bumped the fuelling back up, the pinging stopped.
Not sure the firmware. Where do I find that?
Running speed density.
|
| |
|
|
goldnrust
West Midlands
Minimalist
Posts: 1,887
|
|
Jun 14, 2015 13:00:11 GMT
|
OK ,so you're fairly sure the timing is set right. cool  If you're using Tunerstudio (and you should be as it's definitely better than the old Megatune) then if you go File > Project > Project properties, it'll tell you. |
| |
|
|
shug
Part of things
Posts: 34
|
|
Jun 14, 2015 13:41:25 GMT
|
|
MS1/Extra rev 029y4
|
| |
|
|
goldnrust
West Midlands
Minimalist
Posts: 1,887
|
|
Jun 14, 2015 13:53:48 GMT
|
|
Ok cool. Good that it's the extra firmware. One of the limitations of the e029y4a firmware is that the resolution on the injector pulse widths is 0.1ms. The 'hi-res' hr_11 firmware gives you control of the injectors down to 0.01ms, but it only works with big impedance injectors. As the pulse widths are generally small at idle, the hi-res firmware does allows for better control and less of the jumping between to rich and too lean.
But before worrying about firmware, can you answer the other questions:
While you're trying idle, what are your injector pulse widths and duty cycles?
Whats the injector dead time set to?
What sort of VE values are in your fuelling table at the idling cells?
If the engine constants are set wrong, you can end up with a VE table that's out of scale, which makes idling difficult. Also if your injector dead time is too close to your idle pulse widths, it can cause problems.
|
| |
|
|
goldnrust
West Midlands
Minimalist
Posts: 1,887
|
|
Jun 14, 2015 14:03:57 GMT
|
Infact, it might be worth just posting up a screenshot of your whole fuelling table. |
| |
|
|
shug
Part of things
Posts: 34
|
|
Jun 14, 2015 14:29:39 GMT
|
Heres the ve table and engine constants.  After using the table generator by sticking in peak torque/bhp/rpm figures, I used the Tune analyze live which has given me above. So not tuned for road driving, or max rpm, just up to about 4000 rpm, and not under load, given its not driven anywhere/ Oh, and original injection system on this was the bosch LE jetronic. Injectors 170 cc per min from what I've managed to find out. |
| |
Last Edit: Jun 14, 2015 14:35:38 GMT by shug
|
|
shug
Part of things
Posts: 34
|
|
Jun 14, 2015 14:40:14 GMT
|
|
Ooo, it idles now. Not exactly smoothly tho, still sounds like the proverbial bag o spanners. Stalls if you rev it and release throttle pedal.
|
| |
|
|
|
|
|
Jun 14, 2015 20:37:46 GMT
|
|
seeing at it will run at 1400 rpm, set the throttle stop screw so that it will run at the and then check for air leaks, are you getting a good trigger signal at low rpm aswell?
Take a log of it whilst it is running (if you can, never used MS1, just MS2) and also ask on the megasquirt forum as there is a wealth of info on there!
usually when its getting a big fluctuation between the AFR readings you have a miss fire of some sorts in my experience.
James
|
| |
Too many projects, not enough time.
|
|
