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

[bmwfnatic]

Sorry for another thicko question.

If TestO is used to log the data and then Excel or MathLab is used view and to manipulate the data.

What purpose does MegaLogViewerHD serve?

Filtering the log and compiling the logged data into the required table.

[ac427]

Sorry for another thicko question.

If TestO is used to log the data and then Excel or MathLab is used view and to manipulate the data.

What purpose does MegaLogViewerHD serve?

[ac427]

I have Testo running ok but how and what do i need to log?

[YulCmr]

The WOT table is a multiplier applied over certain cells in the VE table. So changing your VE table can affect your WOT map. The correct way to tune WOT is actually to tune the VE table, but as you state, the car runs open loop in these sections so this method should achieve the same outcome. No, this method will not change your WOT tuning and AFRs.

Thank you for your answer.

After a quick reading of the tune, full load table was indeed modified, but so was the big Alpha N table. (now richer on bottom end and leaner on top end).

If I get corrections in my VE table using this method, can it "fine tune" the tune I got ?

From my understanding, as my VE table keeps dropping after 3 passes, it means that I was running a bit rich with this tune ?



As far as I can tell, drivability has been GREATLY improved after 3 passes !

Thank you guys.

[Bry5on]

The WOT table is a multiplier applied over certain cells in the VE table. So changing your VE table can affect your WOT map. The correct way to tune WOT is actually to tune the VE table, but as you state, the car runs open loop in these sections so this method should achieve the same outcome. No, this method will not change your WOT tuning and AFRs.

[YulCmr]

Hi !

I'm currently in the process of logging and correcting the VE map. (3rd iteration as of now, slowly getting there)
Can someone confirm (or correct me) that, VE Table is only used during Closed loop ?

I'm doing this process over a WOT corrected tune, so I just want to be sure that during WOT, ECU does not use VE table. (Which would interfere with the current WOT tune)

Thank you for your work guys, this is quite easy to understand and replicate (even for a noob like me)

[inlinesix123]

Just finished this. The car is changed, shifts fight the engine a lot less, downshifts are smoother. 10/10
Thanks to Suleiman Pasha.

[Bry5on]

Bry5on and heinzboehmer (hope you don't mind me tagging you both!) you've driven each other's cars post this tuning process yeah? Keen to know what differences there are in "drivability" between flap and no-flap setups that are properly tuned? Any thoughts/comments on that?

No difference that I can tell, really just the noise. I like having quiet mode available - I drive probably 60/40 in sport (loud) mode where the flap opens at 3300rpm or 40mph.

[heinzboehmer]

Bry5on and heinzboehmer (hope you don't mind me tagging you both!) you've driven each other's cars post this tuning process yeah? Keen to know what differences there are in "drivability" between flap and no-flap setups that are properly tuned? Any thoughts/comments on that?

I bet Bryson will tell you his flap makes a difference in driveability cause he drives his car a lot more than me.

However, I haven't noticed enough of a difference to make me want to get the flap.

(Also Bryson's car has smaller diameter tires, which, to me, makes a much bigger difference in driveability)

[karter16]

Bry5on and heinzboehmer (hope you don't mind me tagging you both!) you've driven each other's cars post this tuning process yeah? Keen to know what differences there are in "drivability" between flap and no-flap setups that are properly tuned? Any thoughts/comments on that?

[SliM3]

Logic would dictate that setting the flap to 10k would run the engine lean at part throttle as the part throttle fueling maps don't seem to get touched by tuners. If you don't have a tune then this is even easier. Personally I'd rather stay on the safe side and target stoich like the factory did, or even a little rich, at higher loads (which is where the flap map has an effect).

If you want to make life harder for yourself, you can zero the flap map then apply more fuel in the main map in the same places. This would have the same effect.

A leaner burn at high loads will tend to run hotter with no power gain. No reason to run lean in that part of the map IMO.

More than one way to skin a cat when it comes to this stuff, for sure. I tend to target the map that directly controls the specific function because a lot of these parameters interact with one another and a change in one spot can have an inadvertent change somewhere else.


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[Bry5on]

Logic would dictate that setting the flap to 10k would run the engine lean at part throttle as the part throttle fueling maps don’t seem to get touched by tuners. If you don’t have a tune then this is even easier. Personally I’d rather stay on the safe side and target stoich like the factory did, or even a little rich, at higher loads (which is where the flap map has an effect).

If you want to make life harder for yourself, you can zero the flap map then apply more fuel in the main map in the same places. This would have the same effect.

A leaner burn at high loads will tend to run hotter with no power gain. No reason to run lean in that part of the map IMO.

[Slideways]

Set to 10K. This will force the DME to operate as if the flap is closed and will only use the main VE map, as opposed to running the flap as "full open" which factors in the supplemental map.

Will that limit power from 3.3k to 8k? All the CSL modified tunes typically have the default flap settings, which makes me think that they are tuned like this. Guessing that the tuners are changing the main VE map and leaving the flap supplemental map alone.

[SliM3]

Should the flap RPM be set to 0 or at or around 900?

Set to 10K. This will force the DME to operate as if the flap is closed and will only use the main VE map, as opposed to running the flap as "full open" which factors in the supplemental map.

[Bry5on]

Where I can find this config?

I’ve not done it in over a decade (code an e36 s54 swap) so my memory is rusty, but most of the info is available online these days with some thorough googling. You should be able to perform the changes using TunerPro since XDFs exist now. Back in the day it was all done in hex editors!