A quick and easy way to street tune your CSL conversion for drivability.

[discoelk]

For the record, here’s the difference between the default CSL tune and the 5 runs in version using this method on my car. Super clever, thank you for sharing!

Frist off, thanks to everyone who worked on this. I have done similar part throttle tuning in other applications but always wondered if it were possible to do for the S54 with more or less "free" software.

Interestingly my car didn't need many changes. I always thought it ran well without any of the jerkiness that is commonly reported with the CSL tune. My set-up is slighly different than Bry5on and heinzboehmer. I'm running the Karb race box and megan headers with a homebuilt catted 2.5in section 2. Guessing this is related to better airflow with the SS headers or perhaps a more refreshed fuel system. New pump and filter within the last 1000 miles.

I logged for around 20-30 minutes and tried to vary load and hit as many engine speeds as I could. A bigger dataset would certainly work better. Next step is to get more data and set-up my wideband for WOT fueling.

[ac427]

Pavlo Thank you for this excellent work.

I think a lot of CSL owners used to remove the CSL flap disc from the airbox snorkel because the opening mechanism was unreliable.

So without the flap i guess the car is being under fuelled below 3000 RPM ?

I have the CSL airbox and camshafts in my car and i definitely have a dip when trying to pull away normally.

Is the CSL flap always open in Sport mode and would therefore not effect the fuelling?

[pnvhome]

Thank you to everyone who helped! And a huge thank you to the creator of the topic, and those who posted additional files and clarifications! After the final runs and testing of the car, and after about 5 trips with logging, the car has completely changed. Now there's torque from 1200 rpm, the car doesn't tremble in calm mode, and the gearbox shifts at 2700 rpm. There's a complete feeling of torque at low revs; it seems to me that even on the stock intake, it didn't work like this. Now it's just joy with every trip, as if it's a completely different car, the one that was intended).

[et89]

When not running the CSL conversion, But Alpha-N, would you tune the Volumetric efficiency map and the Alpha-N map is a correction over that, or should you just tune the Alpha-N map?

[chapmans]

I'm excited about this then. I have a light flywheel and have always been amazed how garbage the throttle blips are with the CSL tune and carbon airbox

[heinzboehmer]

Very much yes. Totally solved in my car, finally.

Same. Was overshooting my rev matches at first , since the engine actually responds to part throttle inputs now

[Bry5on]

Nice. I totally need to learn how to do this. Care to offer remote support?

You’ve gotta make some local e46 M3 friends! A crew of 2 or 3 in your area is your best bet

[puma1824]

Very much yes. Totally solved in my car, finally.

Nice. I totally need to learn how to do this. Care to offer remote support?

[Bry5on]

Does this optimization help with throttle blipping for downshifts?

Very much yes. Totally solved in my car, finally.

[chapmans]

Does this optimization help with throttle blipping for downshifts?

[rtrules]

Pavlo: This is a great way for diy tuning, awesome.
Do you or anyone else know if there is a way to do the same with the MSS54 Alpha N Software?

[Bry5on]

If you have the flap, it shouldn’t matter if it’s closed or open based on the way the DME works, but I kept mine closed (second gear, comfort mode) just to control the variable, just in case.

[heinzboehmer]

Keep it closed or open? Won't having it closed be an issue in the upper RPMs?

Keep it closed.

The additive VE flap table will take care of the extra fuel needed at higher RPMs.

[Cubieman]

Also keep the flap closed for all your logs.

Keep it closed or open? Won't having it closed be an issue in the upper RPMs?

[heinzboehmer]

Also keep the flap closed for all your logs.