Jezebel's Alpha N Supercharger tune

Burgy

///Member
Hey Guys,

Jezebel should be arriving soon for her Alpha N Supercharger tune. There is currently a base file on the car so that Chris can get around.

I will use this thread to show everyone the attention and detail that goes into a custom Project Shift file.

Stay tuned!

First step, check on errors and clear fueling adaptions so we can get an accurate reading. Keep in mind that the car already has a base file on.



My weapon of choice to test AFR's (Air fuel ratio) is an Innovate LM2



Attaching the 02 sensor. I always add some metal wire from each exhaust hanger to the 02 sensor mount, this will make sure the sensor doesnt move or fall out.





I always use more tape than needed to secure the line and make sure the connector doesnt scratch the paint. I used to run it through the boot, but after a while, the cable started giving issues.



Plug Innovate into OBD so I can measure accurate AFR vs RPM



Idle AFR:



Then we test the AFR's on the road, We do a part throttle run from 1500rpm to redline and then a full throttle from 1500rpm to redline. I prefer to do this on the road because its all real time and more accurate than a dyno. I will use the dyno if the car is anywhere over 350kw, simply because you dont really have enough space to do part and full throttle 3rd gear runs.. Unless you have your own private logging road.. which I do..

Driving with chris always requires seat belt, helmet, neck brace and my 'have no fear tablets'. This is because with Chris, everytime he starts the car, the time trial has begun.. :fishwack:

AFR's all done! Below in graph form. Red for RPM, Pink for AFR. Youll notice the AFR sky rocket into the 20's. That happens when changing gears or lifting off the throttle.

Afr's ranged from 10.2 to in the high 13's, this is FAR from perfect as with a supercharger file, we target AFR's between 11.5:1 to 12:1



Final tweaking is being done to the file, which should be ready soon! More logging with Innovate and INPA still to come!
 

Prev

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Staff member
So what you are basically saying is "Hurry up and wait!!" :biglol:
 

Crash_Nemesis

///Member
DSC_00161_zpsc067a192.jpg
 

Burgy

///Member
Chris, you cant really get rid of that problem, its built into the actual coding. If the ecu does lock then we can have the EEPROM replaced as I did with my car.
 

moranor@axis

///Member
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I assume you need to use INPA also because with the other O2 sensor so far back you cant account for fuel burnt in the exhaust itself?
 

Peter@AEW

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Burgy help me here.
You are collecting data from one of the exhaust pipes.
Why not both exhaust pipes (one from each side of the car)? (or are you?)
 

moranor@axis

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Official Advertiser
a1exander said:
Burgy help me here.
You are collecting data from one of the exhaust pipes.
Why not both exhaust pipes (one from each side of the car)? (or are you?)

dont think that matters there is a chamber where all exhaust gasses will mix in the back box of the M3
 

Burgy

///Member
Moranor is correct, there are 2 points where the gasses mix, so afr would be the same on either bank or tailpipe.

Yes, I will compare my logs with inpa logs. Generally they are the same.
 

Peter@AEW

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Official Advertiser
moranor@axis said:
a1exander said:
Burgy help me here.
You are collecting data from one of the exhaust pipes.
Why not both exhaust pipes (one from each side of the car)? (or are you?)

dont think that matters there is a chamber where all exhaust gasses will mix in the back box of the M3
In principle you may have a point in reality though the inside pipes are perforated and packed in glass fiber therefore the mix of gasses may well happen but not as thoroughly as they might had there been no glass fiber around the perforated steel pipes.
?
 

moranor@axis

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flow rate could differ on this car between pipes but all exhaust gasses are mixed before they exit the chamber? see the camber in the center before it is split into 4

IMG_1048.jpg
 

Burgy

///Member
The backbox isnt the main source of the 'mix'. M3's have an H pipe right after the cats and a center box.

All tailpipes will yield the same afr unless something catastrophic happens to the exhaust
 

Peter@AEW

BMWFanatics Advertiser
Official Advertiser
Burgy@ProjectShift said:
The backbox isnt the main source of the 'mix'. M3's have an H pipe right after the cats and a center box.

All tailpipes will yield the same afr unless something catastrophic happens to the exhaust

Eish I had a blonde moment....more like a blonde lifetime :)
You are right there is an H box.
 
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