diagnosing N54 with DIS

dreadnaxt · 10-15-2012, 01:44 AM

Hey guys, anyone here who played around with N54 using DIS?

I was doing it yesterday just to satisfy my interest. On the idle rmps pressure before throttle valve is 97 kPa and after is 280 pPa. (13.5 psi and 3.9 psi respectively)

I found out that pressure before throttle with pedal to floor is 156 kPa (which is ~ 13.5 + 8.3 psi atmospheric pressure + turbo). And it seems to be fine as stock pressure is about 8 psi as far as I know.
But if I look on the pressure value after the throttle it always gets till 1200 pPa sharp (which is 16.8 psi) and stays there till the end of acceleration.
It's less than it should be in total and it's more then it should be if I compare difference between idle rpm and full throttle.

It looks a bit strange as turbo pressure is changing a bit in time, but this one stays still.
I assume that this is some kind of wrong data interpretation in DIS, but can anyone confirm this?

JamesM3M5 · 10-15-2012, 08:56 AM

Atmospheric pressure at sea level is about 14.7psi = 1 bar = 100 kPa, so at idle you are reading 97kPa, just a tad bit less than atmospheric pressure at sea level.

The pressure sensor inside the manifold tops out at about 4psi. It is not designed to read actual manifold pressure. You are reading everything normally.

dreadnaxt · 10-15-2012, 09:54 AM

Thank you! Now it's clear. So I can assume that turbos are producing designed pressure?
Yeah, I'm a bit higher than sea level, so I think it's normal that it shows 97 kPa

vasillalov · 10-15-2012, 09:56 AM

What hardware are you using to run DIS?

dreadnaxt · 10-15-2012, 09:59 AM

Quote:

Originally Posted by vasillalov

What hardware are you using to run DIS?

Laptop you mean? i5, 8gig. I'm running it in VM.
If you're talking about connection, then it's just normal OBD D-CAN and ediabas <-> diag-head emulator

vasillalov · 10-15-2012, 10:11 AM

Quote:

Originally Posted by dreadnaxt

Laptop you mean? i5, 8gig. I'm running it in VM.
If you're talking about connection, then it's just normal OBD D-CAN and ediabas <-> diag-head emulator

Interesting. I have a DIS running on a VMWARE image, but for some reason it refuses to connect to the car. I've not messed with it too much though... I'd love to get DIS running on my laptop though.

dreadnaxt · 10-15-2012, 10:32 AM

Quote:

Originally Posted by vasillalov

Interesting. I have a DIS running on a VMWARE image, but for some reason it refuses to connect to the car. I've not messed with it too much though... I'd love to get DIS running on my laptop though.

Was it ever working with any other car? Or you just gave it a try and that's all?

vasillalov · 10-15-2012, 10:59 AM

Quote:

Originally Posted by dreadnaxt

Was it ever working with any other car? Or you just gave it a try and that's all?

Yeah, it was a ready made VMWARE image posted by a user on another forum. I only gave it a quick try without much effort... I guess I need to spend some time fiddling with it.

landman2k1 · 10-15-2012, 12:33 PM

Quote:

Originally Posted by vasillalov

Yeah, it was a ready made VMWARE image posted by a user on another forum. I only gave it a quick try without much effort... I guess I need to spend some time fiddling with it.

I was using DIS on my e46, so it's been a while, but I dont think using someone else's image would work. Well, the image might, but there are settings in VMware that would be specific to your computer. I forget the terminology, but there are some settings that allow the VMware to pass through the usb port to allow communication with the vehicle.

vasillalov · 10-15-2012, 01:10 PM

Quote:

Originally Posted by landman2k1

I was using DIS on my e46, so it's been a while, but I dont think using someone else's image would work. Well, the image might, but there are settings in VMware that would be specific to your computer. I forget the terminology, but there are some settings that allow the VMware to pass through the usb port to allow communication with the vehicle.

Thanks. I'll have to dig more into this when I get some time.

dreadnaxt · 10-15-2012, 01:25 PM

What you need to configure is static ip address of your vmware network card. You can do it in your win control panel network settings.
You will also need diag-head emulator, to make dis beleive that d-can is bmw diagnostic head.

cn555ic · 10-15-2012, 02:12 PM

I have dis57 and dis v44 working together in one program.

10-15-2012, 01:44 AM	#1
dreadnaxt Enlisted Member 2 Rep 42 Posts Drives: 335Xi e92 Join Date: Nov 2010 Location: Switzerland iTrader: (0)	diagnosing N54 with DIS Hey guys, anyone here who played around with N54 using DIS? I was doing it yesterday just to satisfy my interest. On the idle rmps pressure before throttle valve is 97 kPa and after is 280 pPa. (13.5 psi and 3.9 psi respectively) I found out that pressure before throttle with pedal to floor is 156 kPa (which is ~ 13.5 + 8.3 psi atmospheric pressure + turbo). And it seems to be fine as stock pressure is about 8 psi as far as I know. But if I look on the pressure value after the throttle it always gets till 1200 pPa sharp (which is 16.8 psi) and stays there till the end of acceleration. It's less than it should be in total and it's more then it should be if I compare difference between idle rpm and full throttle. It looks a bit strange as turbo pressure is changing a bit in time, but this one stays still. I assume that this is some kind of wrong data interpretation in DIS, but can anyone confirm this?
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10-15-2012, 08:56 AM	#2
JamesM3M5 Some dude 92 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	Atmospheric pressure at sea level is about 14.7psi = 1 bar = 100 kPa, so at idle you are reading 97kPa, just a tad bit less than atmospheric pressure at sea level. The pressure sensor inside the manifold tops out at about 4psi. It is not designed to read actual manifold pressure. You are reading everything normally. __________________ RRT E92 335i/6MT with stuff and things
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10-15-2012, 09:54 AM	#3
dreadnaxt Enlisted Member 2 Rep 42 Posts Drives: 335Xi e92 Join Date: Nov 2010 Location: Switzerland iTrader: (0)	Thank you! Now it's clear. So I can assume that turbos are producing designed pressure? Yeah, I'm a bit higher than sea level, so I think it's normal that it shows 97 kPa
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10-15-2012, 09:56 AM	#4
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,396 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	What hardware are you using to run DIS? __________________ 6MT \| COBB \| AR \| AE \| Forge DV \| HPF \| P3 Gauge \| Hybrid Intake \| O.S.Giken TCD \| All M3 bits \| TCKLine \| StopTech \| UUC \| ER \| SPEC
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10-15-2012, 01:25 PM	#11
dreadnaxt Enlisted Member 2 Rep 42 Posts Drives: 335Xi e92 Join Date: Nov 2010 Location: Switzerland iTrader: (0)	What you need to configure is static ip address of your vmware network card. You can do it in your win control panel network settings. You will also need diag-head emulator, to make dis beleive that d-can is bmw diagnostic head.
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10-15-2012, 02:12 PM	#12
cn555ic 441 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	I have dis57 and dis v44 working together in one program.
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