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

[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!

[Simas306]

That question is officially past my pay grade. I don’t really understand why you wouldn’t use the Z3M/e36 configs where it gets speed signal from the diff. Gear is calculated from speed signal in both cars.

Where I can find this config?

[heinzboehmer]

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

I would guess the end result is the same, but haven't personally tested.

[Bry5on]

But did it used this map before I made flap open all the time? It is swapped in E36 so it doesn't see gear or speed and I used comfort for mapping on dyno which is set 9k rpm opening by default from neutral to 2nd gear.

If not it might be running rich up top now

That question is officially past my pay grade. I don’t really understand why you wouldn’t use the Z3M/e36 configs where it gets speed signal from the diff. Gear is calculated from speed signal in both cars.

[Simas306]

You want the compensation at higher loads all the time. If you zero the whole map, you will not get enough fuel until you do a full retune again. The map has no effect whatsoever where the cells are zero. Zeroing that map will only make your life harder! Looks like yours is running with the correct amount of fuel pretty much everywhere, although I’m surprised that solved your bucking issues.

But did it used this map before I made flap open all the time? It is swapped in E36 so it doesn't see gear or speed and I used comfort for mapping on dyno which is set 9k rpm opening by default from neutral to 2nd gear.

If not it might be running rich up top now

[Slideways]

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