M K

iTrader: (9)

I am a bit lost with this 1 and need a bit more guidance,

My dash2 is displaying map sensor reading in Millibar which is what the ecu outputs

To get the dash to read as per a normal mechanical boost gauge in psi/bar i believe i have to subtract the atmospheric pressure from the map sensor first which is either 1 bar/14.5psi/1000mbar

The data stream in the ecu for map sensor reading definitely says output in Mbar, with the following equation

"To convert use Y=(1*x)+0 to engineering units in the range 0 - 3000 pressure,millibar" this must be correct as currently the dash2 display outputs exactly as per the ecu give or take 2 millibar

With the engine turned off and just the ignition turned on the life ecu reads 711 millibar and so does the dash 2

So going by this i need to subtract another 1bar or 1000millibar for atmospheric pressure so i should end up with -289 millibar which is - 4.19 psi

Does this sound right for engine off as i do not have a mechanical boost gauge to test this with

I know the conversion for the display to output can not read vacuum as minus x psi But any idea how we can input whatever is needed so once the pressure under load reaches and exceeds atmospheric pressure that the dash will show it in psi just as a normal boost pressure gauge would?

Here is the picture of my map sensor output


And the boost sensor scaling i got from someone off a t6 ecu for the same bosch 5 bar map sensor


And the map sensor scaling currently in my ecu


No idea why mine and the t6 pectel scaling is different?

Anyone help with this? i am awaiting a reply from race technology on this as well but thought id ask on here as well as there is a lot of knowledge on these forums

Thanks
Marc

M K

iTrader: (9)

Bosch 5 bar map sensor by the way

markk

iTrader: (2)

It is not the map calibration you need to scale it is the data output of the ECU or the dash input maths (though iirc the CAN variables ar not changeable in the dash2) ps dont wait too long for their support lol



This is my telemetry setup for CAN output, you can see the scalars at the end

stevieturbo

Ignoring all else, your map sensor is not calibrated correctly in the ecu. Key on, engine off it should be around 1000mbar, obviously this will vary slightly with altitude and weather.
711 is miles off though

Best thing to do is get a Mityvac and actually test and calibrate the sensor manually.

Watch the linearisation screen you've posted apply vac/pressure to the sensor and start filling in some values in the table. It should be a straight line anyway, so it might only take a few entries and you can just interpolate between them.
But it's always good to do this basic test anyway so you know 100% things are reading as expected.

stevieturbo

You could copy the values as per the Pectel, and they should be the same for the Life if the actual values are correct in the first place.

But again...physically testing yourself removes all doubt.

eg based on Pectel values either side of maximum ( simply as cant read the first value as the rad hides it )

I did upload a video but quality was shite, trying to get a better screen cap software downloaded now

Although a little odd that it seems to max around 4600 for a 5 bar sensor....should still be adequate for most purposes though unless you intend running more than 3.5 bar boost lol

stevieturbo

It's more legible at 720HD quality

https://www.youtube.com/watch?v=PLQk...ature=youtu.be

Obviously File/save to save the changes to file, and Device/Program to flash changes to ecu although I didnt show that in video

wes

I seem to remember someone on here (years ago now) mentioning that they were actually a 4.6 bar sensor and not a 5 bar sensor

wide ka

i have the same issue on my dash 2 using omex 600

i would be very happy if you get it sorted to share how i sort mine!

thanks

stevieturbo

There are two issues here though. Firstly the map sensor is not calibrated correctly in his ecu....so anything it sends out will also be wrong.

And then there is the settings within the CAN adaptor and of course the Dash2 itself where you can apply maths functions to the readings so they display differently to suit whatever units you wish to assign to them

wide ka

I see, I have the later issue

I did speak with racetechnology but they wasn't much help, I'm running a normal 3 bar map sensor

I did consider buying another pressure sensor just for the dash display but would rather be able to use the can setup properly

M K

iTrader: (9)

Cheers for the info and the video

Il look into re calibration the sensor

Thanks
Marc

Mark Shead

So was it mapped with a incorrect map calibration.

Mark

M K

iTrader: (9)

All I know is that's what it says now? So will have to find out

Mark Shead

You need to find out as any change on the map sensor the ecu map will be out.

Mark

stevieturbo

Yep...if someone actually mapped the engine with the map sensor like that, it needs re-done, and whoever done it needs a slap.

That's basic initial setup stuff there and should have been obvious it's wrong to anyone tuning the car

Was it tuned with that 5bar map sensor installed...or a 3bar map sensor ( which is what the sensor setup looks like it is for )

wes

I just had a quick (well, took me 10 mins) look through MK’s build thread and found this pic:



So it looks like it was mapped with the 5 bar sensor, but it does indeed look like a 3bar sensor linearisation on the screen shot supplied above, are you sure you are looking in the correct place in the software? Looks like there is more than 1 MAP sensor linearisation table available (MAP1A, 1B, 2A, 2B). Hopefully it’s something simple like that.

M K

iTrader: (9)

I will have to find out, I will not change anything until I know for sure and get it checked etc,


Just found this,



This is the proper data sheet I got from from Mike Rainbird as I lost the 1 that came with it but he said this is the correct 1 but doesnt show much in detail


Thanks
Marc

stevieturbo

Have you any datalogs from when it was mapped ?

M K

iTrader: (9)

Don't think so mate

stevieturbo

It would be very helpful if there was, at least then you'd be able to see what map sensor readings were like to be sure if it has been tuned with all settings correct.

If someone has went to the trouble of dynoing it as the picture above suggests....it seems beyond the realms of possiblity they'd have got such a basic yet vital thing to be wrong

M K

iTrader: (9)

It has been dyno'd an run in already yes, why it's like it is I don't know and will have to find out,

Tommy ran it in and done a power test ect and there We're no issues, but the car was always planned and still has to have engine mapped in car on the hub rollers before being used but should be only for tweaking here and there

Dyno run vid is here

stevieturbo

Even a close up video of the laptop during a pull ?

Martin-Hadland

iTrader: (2)

It is Wes, thats why the screen shot of my Pectal linerisation curve thats been used above goes up to 4615.

M K

iTrader: (9)

Hi Martin

Forgot it was you that posted the pic for me (thanks)

How did you get that scaling? Did you calibrate sensor yourself?

Thanks
Marc

Martin-Hadland

iTrader: (2)

I can't remember but I'm sure its right... It did 200mph

M K

iTrader: (9)

Dragging this up from a while back as I forgot all about it until now and you guys were indeed correct,

There was an issue with the bosch sensor so engine was mapped on a 3 bar map sensor, but when I got the engine back I was given both sensors and forgot all about it, so I plugged in the 5 bar hence the wrong scaling,

When I took it back to be set up the other day Tommy spotted the wrong sensor straight away, swapped to the 3 bar and perfect,

Dash display reads 1000mbar when engine off and cars perfect,

So now going to look imo this again to get the reading in psi

Thanks
Marc