Serious data logging.....
Turbo Mini Forums

Since working out how to use the MAFs (a slightly earlier thread) I've had some new PCBs made up,



Bottom left is my IOx-OEM (had that built for a while) and top left / bottom right are the miniature hall switch boards for our traction control so ignore them too.

All the rest are for up to 13 channels of data.

partially assembled



Four pressure sensors and the main data connector back to one of Jean's IOx's or IOx-OEM's

The pressure sensors are the most space intensive using just 50x50 PCBs.

And the whole box,



It all actually goes in the bottom half but not until I cut slots/holes for the data/power connectors.

What we will have is,

4 pressure,
4 temperature (not shown yet)
4 EGT (only 2 shown), and,
1 MAF

All through sticking with the MS2 and understanding how it works with Jean's IOx (albeit we may have to slow the data rate down slightly when using an IOx project at the same time as an MS2 project but Graham and myself haven't found this to be an issue yet despite Jean's warnings).

All part of trying to get a "total" picture of BSFC and the other unknowns on the five port.

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

well done rod ,looks, and sounds ,good.

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

Looking good.

What pressure rating did you go for with the sensors Rod?

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 ???

If you're thinking of logging Turbine Inlet pressure, then it may be worth considering going higher. You will hit the pressure limit at quite low boost and it can be very spikey.

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 ???

Edited by Paul S on 29th Nov, 2012.

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."

Nice work Rod. Looking good.
What spacers will replace the toilet roll/ kitchen roll tube?

Edited by Graham T on 30th Nov, 2012.

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

Edited by robert on 30th Nov, 2012.

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

Edited by Paul S on 30th Nov, 2012.

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."

from what i understand this is impressive stuff.. grate work!

Starting with Robert...

On the basis of 45 psi - the next model up in the Freescale sensors of that case design is 15-700kPa (so 85psi(g)), a bit OTT and will be down on sensitivity because of it.
They make a 15-500kPa model but not in that case design - annoying....

Re the AFR offset, it won't be an earth issue on the TechEdges because, at the moment, I don't use the analogue outputs, just the digital straight to the display modules. I can't actually remember if I put the internal shunt on or not as, at the time, I had no intention of using the WBlin outputs, differential or otherwise...
But now that I've got all this spare data capacity you've certainly made me wonder whether I should hook the analogue up (with and without the shunt) and see what it says.

Certainly the sampling method we are all using, in principle, should ensure the LSUs aren't pressurised - that was of equal (perhaps greater) concern than their temperature limits to me. Tube sizes, angles, everything I could do to give confidence, but the only way to be sure would be to measure it....
The only thing that niggles me a bit is whether taking the "outer" sample from just one exhaust port whilst the "inner" is from a double port is causing a pressure effect despite the tube sizes I chose. I think Graham is the only one to have commoned the outers up but we have no significant data from that engine yet.

In reallity the issue is most likely me having two TechEdges and one Innovate - my plan always was to move over to 14point7 SLC-OEMs (as Jean's IOx supports the 14point7 digital data format and they are very cheap compared to the mainstream manufacturers) but there were certain "issues" last year over the way he handled two problems of his own making so that plan went on hold.....

Now Paul,

You had me worried for a minute.... using MAF was a key part of our plan.

But for the price of another sensor and a bit more pipe to read TIP, it may as well be added to the list.

The engine's going to be back out shortly to fit the TC sensors (could probably do it from underneath but there is a bit too much play in the pot joint to gearbox support sleeve/seal so I want to re-bush them).

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

I'm seeing over 5 Barg (70 psig) TIP on the simulation of the new 998Ti at just 0.8 Barg (12psig) boost. Mind you, I'm purposely keeping it spikey to make use of the troughs :)

Edited by Paul S on 30th Nov, 2012.

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."

So the 15-700kPa one doesn't seem a bad idea then.

I've got enough space (physical and data) for it.

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