How to calculate boost pressure by MAF gs / rpm and Lambda?

[mmartin191]

Hi, does anyone know how to work out the boost pressure by Maf / Rpm and Lambda.

1.9tdi pd105
Diesel 14.7
Each cylinder is 474cc x 4
Atmos pressure is 1040

An example set of known data.
AFR: 11.44
Boost: 1990 mbar
MAF: 500
IQ: 29.73

I need to work out how the calculation for boost using the above.

Thank you

[DiegoStud]

IQ 2973?- not likely... Patm 1040-rainy day where you are..... lambda 11.44- what even is this 11.44:1 AFR? Petrol? But 474cc is a 1.9TDI?.........wait you managed to run a TDI on petrol??

Edit: My bad 1040 is cracking the flags.

[mmartin191]

I've made amendments to the original.
Injection quantity in MG is 29.73 (sorry read it without a factor applied.)
11.44:1 AFR
Diesel - 14.7

Edit -
This is the stock map of the car.

[DiegoStud]

Stock map- EGR on-low MAF readings and rich lambda.
If you know the lambda you want this would help. Divide airmass by IQ and away you go.

[davorsule]

Stock map- EGR on-low MAF readings and rich lambda.
If you know the lambda you want this would help. Divide airmass by IQ and away you go.

I think it's enough accurate for iq_limit_by maf map, turbo pressure> dividing 474 mg/stroke of air by maf value and got the pressure, and with pressure and AFR calculate iq_smoke limit.

[mmartin191]

Sorry, it's stock in the sense of the maps previously mentioned, but egr is off etc.

[davorsule]

Also this maf value=500 is with egr on, so you can't use this values. also afr is not good!

[davorsule]

Sorry, it's stock in the sense of the maps previously mentioned, but egr is off etc.

how you got these values?
with VCDS?

[mmartin191]

This is from Winols. You're right though, I need to add the EGR values onto the maf.

[davorsule]

This is from Winols. You're right though, I need to add the EGR values onto the maf.


.. please see carefully are these values from stock maps if you look in winols?!
and explain what are you trying to do?
calculate max turbo pressure for which map or calculation?

[davorsule]

For example I log data with VCDS while testing engine:
rpm=2331 rpm
iq limite=55,2 mg/stroke
duration=24 deg.
smoke limit=332 Nm
maf=1035 mg
turbo pressure=2173 mbar or 1,276 bar
atm pressure=897 mbar

[mmartin191]

Yes these are completely stock values.

I have worked out the Injection quantity needed to achieve a certain AFR, I now need to work out how much boost is needed to correlate with that.

This is for the boost map.

[davorsule]

Yes these are completely stock values.

I have worked out the Injection quantity needed to achieve a certain AFR, I now need to work out how much boost is needed to correlate with that.

This is for the boost map.

yes, I understand, and what is your maximum maf value and iq?

[mmartin191]

maf - 1200
IQ - 65.31
AFR - 12.50

[davorsule]

maf - 1200
IQ - 65.31
AFR - 12.50

AFR= 18,37:1

[davorsule]

turbo pressure for this iq, and maf>
=1,526 bar

[AVDigitale]

what are all this numbers and this threads , is not boeing 747 to tune people is old car golf 5 tdi and easy ecu to understand :D
if someone don't understand let pay for files and brain is clear ;)

[davorsule]

what are all this numbers and this threads , is not boeing 747 to tune people is old car golf 5 tdi and easy ecu to understand :D
if someone don't understand let pay for files and brain is clear ;)

Martin wants to learn tuning, so explain him.

[mmartin191]

what are all this numbers and this threads , is not boeing 747 to tune people is old car golf 5 tdi and easy ecu to understand :D
if someone don't understand let pay for files and brain is clear ;)
Sorry for having an interest in Tuning hahahah

I'm not just looking to tune my own car, I have a genuine interest in it, so comments like this are just stupid.


Martin wants to learn tuning, so explain him.
I appreciate all the help you're giving.

[AVDigitale]

winols course and he will learn for 1 week but is expensive and free nobody can't stay all day here explaining

[mmartin191]

winols course and he will learn for 1 week but is expensive and free nobody can't stay all day here explaining
This is a tuning forum, if you don't want to help, then don't.

[AVDigitale]

This is a tuning forum, if you don't want to help, then don't.
you write for me that i don't helped you ????

[davorsule]

I've seen professional tuners which take a lot of money for 15-min job, and their tuning are like nothing useful. They do stupid errors in maps.

[mmartin191]

you write for me that i don't helped you ????
I'm not getting into an argument mate, yes you've helped before with a file for me to compare to and i appreciate that, but that doesn't give me all the answers I need. I've done a lot of reading and there are things that still aren't clear.

[AVDigitale]

good tuners make this cars for 15min no need more

[davorsule]

good tuners make this cars for 15min no need more

I can make this car in 30 minutes also. Also can rebuild engine, it's in my blood.

[davorsule]

Here I have pd injector in my hands,almost every week in workshop.

Some tuners never seen this injector and they make money tuning injectors without testing them and rebuilding. This is some kind of wasting someone's money.

[mmartin191]

Here I have pd injector in my hands,almost every week in workshop.

Some tuners never seen this injector and they make money tuning injectors without testing them and rebuilding. This is some kind of wasting someone's money.

It's a crazy world out there mate, the reason I want to learn, is that I've had some very bad remaps in the past, some of them are clueless.

[davorsule]

It's a crazy world out there mate, the reason I want to learn, is that I've had some very bad remaps in the past, some of them are clueless.

Yes, I know my friend.
Look at these pistons and crankshafts, some tuners never had them in their hands, and don't know how bloody work is when they crash because of bad remaps.

[mmartin191]

Yes, I know my friend.
Look at these pistons and crankshafts, some tuners never had them in their hands, and don't know how bloody work is when they crash because of bad remaps.

Nice man, I've done a lot of mechanics work like that too, I've got a home built 550bhp Skoda Octavia 1.8t that I tuned myself on a standalone ecu (which made things a lot easier).

[davorsule]

Nice man, I've done a lot of mechanics work like that too, I've got a home built 550bhp Skoda Octavia 1.8t that I tuned myself on a standalone ecu (which made things a lot easier).

You have great experience also. :)