Siamese Code Trial - Take Three
Turbo Mini Forums

The areas where you see the inners go lean are below 3000rpm. I have not spent too much time refining the timing below 3000rpm so far because, as you have pointed out, It is appraent from the logs that it should be relatively easy to sort that out.

I'll do a Megatune log next time out.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Back again...

If I'm reading it right, the most important AFR deviation (outer/inner) is in the second quarter of the log graph which seems to be WOT through the gears.

If you have achieved this improvement by simply moving the two pulses apart by bringing one forwards and moving the other backwards, surely this cries out for shorter "fatter" pulses (ie, bigger injectors, or running your second two in parallel) so you don't have to rely on pushing the timing so far apart ???

Schrödinger's cat - so which one am I ???

But you can sort of see something similar around 230s, 235s, 268s and these are all above 3000rpm. So it's worth seeing what's happening to the pulse widths during transitions.

Anyway, even as it is now, this would be a safe setup for a turbo engine even if it's not optimal.

Jean

http://www.jbperf.com/

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Paul. i had a similar issue with doing runs, recoding data and going home to analyse, my solution was to make a (admitidly very large and clumsy) spreadsheet that took in the raw datalog, parsed the appropriate info, smoothed, and displayed in a graph i could understand quickly. this alowed me to analyse the data "in the field" (or inthe carpark of the kfc to be more accurate) .. worked very well for what i was interested in. this was with raw megasquirt logs, but would be supprised if the same couldnt be achieved with logworks logs!

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

At least you sound more cheerfull today....

which is good...

I still personally favour bigger injectors to get the pulses more seperated. I now have a set off eBay that I will use for my first tests that are ~ 700cc (but obviously I'll be on a 1275 test engine)

Presumably once you go turbo you will be down to a single wideband - what do you think about the correlation (if any) between EGTs and wideband readings from what you see now ???

With my TechEdge I can also do EGTs but do you think it is worth it ???

Schrödinger's cat - so which one am I ???

Paul,

If you use the MT logs then you can use the MegaLogViewer and see, in real time, graphs of what is happening in the engine. Of course, you'd have to wire in the second O2 in the Megasquirt to be able to view the AFR but it's just a few resistors and capacitors that can be put in the proto area of the board and wiring to the MS DB37.

Jean

http://www.jbperf.com/

Slighty O/T but as Paul mentioned earlier about using Jean's latest board...

Is this a copy ???

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...em=150332604546

Or just something different ???

It doesn't do injectors but seems to claim to do the ignition....

Schrödinger's cat - so which one am I ???

It's different in that it's a standalone box while my board is for installation inside the MS case. Also mine is simpler and doesn't do current limiting but it's much cheaper (if you know what you're doing).

It's not bad but, in my opinion, it's a bit expensive for what it is.

Jean

http://www.jbperf.com/

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Well I'm now fully equiped with the latest Eastern European technology... (USB scope).

Bit of hassle getting the drivers recognised and even harder understanding how it works compared to a real scope, but the results are so much easier to save and present.



Not on external trigger yet and I've still got my 10:1 buffered (HV) probes from the real scope connected hence the voltages being all wrong but you can just save the scope view as a file (or save the whole screen in which case you would see all the controls as well, as per Jean's "photo") ....

Schrödinger's cat - so which one am I ???

Great stuff Rod.

Lets see how close you can get them before the second pulse starts to misbehave.

EDIT: Easiest way would be to just wind up the revs.

Edited by Paul S on 17th Mar, 2009.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Schrödinger's cat - so which one am I ???

Great results this morning from a single pulse.

I can finally get the outers running the same AFR than the inners.

Lot easier to set up as you effectively have one VE table and one Injection timing table. Half the variables.

The timing table needs further refinement, but can't make on the fly adjustments as I'm on my own. Sturgeo has gone to get some Proxies.

I'll drop a log later.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Log attached.

Got it close at WOT.

Funnily enough it's more difficult to get the settings sorted at part throttle, but that's not so important at the moment.

EDIT: Changed attached. Time scale was wrong.

Attachments:

23.78kb

Edited by Paul S on 22nd Mar, 2009.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

That looks really good!

You may need to go from a single pulse to 2 pulses at lower load/RPM. This is doable now but it may cause a stumble when switching from one to the other. I'll let you experiment some more to see if you need it. If it's the case, I'll look how to have a progressive transition in the code.

I don't remember which camshaft you're running. I assume that you'd get different results with a lot of overlap.

Jean

http://www.jbperf.com/

This cam has 248 degrees inlet duration on a 12/56.

We spent some time trying to push the cross over point at around 5000 rpm higher, but could not even with something like 40 degrees less advance.

I think that this tells me that 5000 rpm is the maximum speed at which I can get equal AFRs with the 375cc/min injectors. Even fully open for the full intake stroke of the outer cylinder is not enough time to get the fuel in. Retarding the injection timing just means more fuel stays in the port for the next inner cylinder intake stroke.

I'll try to lean out the VE map a bit. That should push it a bit higher.

I definately need to bring in all four injectors for use with the turbo.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

What pulse widths do you have at the cross over point? Just to have an idea of how many degrees are usable for the injection window.

Jean

http://www.jbperf.com/

Forgot to do an MS log :$

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Well done Paul.

That's a great deal of effort gone into proving an aftermarket solution for fuel injecting the five port A series.

Your huge investment in time and equipment has finally paid off.

Time to get it fitted to the Miglia to just show what's possible.

Thanks also to Jean for the code development that made all this possible.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

???

Schrödinger's cat - so which one am I ???