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

[paulpbmw]

karter16 Wow thats a really major discovery !!

I have a question about the standard non csl m3 map (2701) to be precise, what is the y axis on the partial throttle fuel map ?

Im currently fine tuning a friends m3 that a tuner didnt even bother touching.

Trying to use a similar process but also want to get the correct parameter for the y axis, Thanks and much respect 👊

[karter16]

karter16 Wow thats a really major discovery !!

I have a question about the standard non csl m3 map (2701) to be precise, what is the y axis on the partial throttle fuel map ?

Im currently fine tuning a friends m3 that a tuner didnt even bother touching.

Trying to use a similar process but also want to get the correct parameter for the y axis, Thanks and much respect 👊

Hey presuming that you're talking about KF_R_N_AQ_REL then the y axis is plain aq_rel. it's only the CSL maps that were changed to use dr_rel instead.

Cheers!

[paulpbmw]

karter16 I know its off topic but i meant to ask if the y axis on 18x12 load base map is throttle position of another parameter? ill delete the questions after your answer not to contaminate this thread, thanks

[karter16]

karter16 I know its off topic but i meant to ask if the y axis on 18x12 load base map is throttle position of another parameter? ill delete the questions after your answer not to contaminate this thread, thanks

Yep so this is the table in question:


And the y-axis is aq_rel (Relative Throttle Opening) which is calculated by taking the point-in-time absolute cross-sectional opening of both the Idle Control Valve (ICV) and the throttle bodies, summing the areas together and then calculating a relative % opening from that value.

The variable is called aq_rel in the software, and is generally referred to as either that or "Relative Opening". aq_rel is not the same as relative throttle position or relative pedal position. Hope that was what you were meaning?

I would leave these posts here if I was you - I think they're good information for everyone - others might be wondering the same in the future.

If you're trying to visualise the difference between aq_rel and throttle position, consider that when closed the throttle body is essentially a throttle plate at 90 degrees to the body, so that no air can flow. when fully opened the throttle plate is parallel to the flow of air, so airflow is at it's maximum.

Relative Throttle Position is a percentage of how much the throttle plate is rotated from its closed position. e.g. 0% when closed, 100% when the plate has rotated by 90 degrees and is parallel. 50% means it's at 45 degrees (half way through it's rotation).

Relative Throttle Opening is a percentage of the current cross-sectional area that is opened up, and does not have a linear relationship with Relative Throttle Position. Consider that at 50% Relative throttle position the throttle plate is still blocking the airflow significantly, and therefore Relative Throttle Opening under those conditions will be significantly less than 50%.

[paulpbmw]

Ok will do.
So if I were to use test0 to data log Id have to look for relative opening and rpm ? That's ofcoarse assuming that the standard M3 DME is using the same parameter..

[karter16]

yes correct, I think in Testo it's called "relativer Oeffnungsquerschnitt". Either that or you could use https://nam3forum.com/forums/forum/m...sh-counter-etc which refers to it as "aq_rel".

Yes standard M3 software does use the same parameter.

[paulpbmw]

Nice ! Mentally preparing for this.. I don't have access to the car now to mess around with test0..when I do have, I'll have to be efficient.

In the mean time I better read up!

Thanks to all da boys who started this thread.
It's definitely a deep dive into a real tuners world. After this I might convince my friend to CSL conversion 🤙