VVL thresholds / parameters / logic

td-d · **Posted:** Thu Sep 27, 2012 4:01 am

throttlehappy wrote:

Looks like a possible 4000rpm VVL switch point on the 09 Forester 2.5i?

Code:

ROM:000D0D3C VVL_Low_Mode_Below_RPM:.float 3100.0    ; DATA XREF: sub_4E54E:loc_4E678o
ROM:000D0D3C                                         ; sub_4E54E+178o ...
ROM:000D0D40 VVL_High_Mode_Above_RPM:.float 3200.0   ; DATA XREF: sub_4E54E+11Co
ROM:000D0D40                                         ; sub_4E54E:off_4E778o

ROM:000D0D90 VVL_RPM_Minimum_Low_Mode_Below:.float 3000.0 ; DATA XREF: sub_4EAE4+52o
ROM:000D0D90                                         ; ROM:off_4ECD4o

ROM:000D0DC0 OSV_VVL_High_Initial:.float 100.0       ; DATA XREF: sub_4F512+4Eo
ROM:000D0DC0                                         ; sub_4F610:off_4F6D8o
ROM:000D0DC4 flt_D0DC4:      .float 0.0              ; DATA XREF: sub_4F512+3Ao
ROM:000D0DC4                                         ; sub_4F610:off_4F6D4o
ROM:000D0DC8 OSV_VVL_Duty_Low:.float 22.0            ; DATA XREF: sub_4F512+5Co
ROM:000D0DC8                                         ; sub_4F610:off_4F6DCo
ROM:000D0DCC OSV_VVL_Duty_After_High:.float 67.0     ; DATA XREF: sub_4F512+68o
ROM:000D0DCC                                         ; sub_4F610:off_4F6E0o

td-d · **Posted:** Thu Sep 27, 2012 8:32 am

Matt, if you get a chance, could you log some float variables on the '09 forester for me - trying to nail down their function - the VVL routine uses many parameters and switch, and is spread over 6 or 7 subroutines, hell of a convoluted (with tons of indirect referencing just to make it easier...).

All of these are 4byte float, other than the ones specified, no multiplier or adder i.e. x = x. If you could also log IAT, ECT, Oil Temp, MAF (g/s), OSV duty, OSV current, vehicle speed, RPMs would be great, for comparison.

unk_FFFF8AB0
unk_FFFF8AB8
unk_FFFF8AC0
unk_FFFF8AC8
unk_FFFF8AD0
unk_FFFF8AD8
unk_FFFF8AE0
unk_FFFF8AF2 - 16 bit
unk_FFFF8AF6 - 16 bit
unk_FFFF8AFA - 16 bit

unk_FFFF8B10
unk_FFFF8B22 - 16 bit
unk_FFFF8B26 - 16 bit
unk_FFFF8B28 - 16 bit
unk_FFFF8B2A - 16 bit

throttlehappy · **Posted:** Thu Sep 27, 2012 8:34 am

td-d wrote:

Matt, if you get a chance, could you log some float variables on the '09 forester for me - trying to nail down their function - the VVL routine uses many parameters and switch, and is spread over 6 or 7 subroutines, hell of a convoluted (with tons of indirect referencing just to make it easier...).

All of these are 4byte float, other than the ones specified, no multiplier or adder i.e. x = x. If you could also log IAT, ECT, Oil Temp, MAF (g/s), OSV duty, OSV current, vehicle speed, RPMs would be great, for comparison.

unk_FFFF8AB0
unk_FFFF8AB8
unk_FFFF8AC0
unk_FFFF8AC8
unk_FFFF8AD0
unk_FFFF8AD8
unk_FFFF8AE0
unk_FFFF8AF2 - 16 bit
unk_FFFF8AF6 - 16 bit
unk_FFFF8AFA - 16 bit

unk_FFFF8B10
unk_FFFF8B22 - 16 bit
unk_FFFF8B26 - 16 bit
unk_FFFF8B28 - 16 bit
unk_FFFF8B2A - 16 bit

Can do but it will not be for a week unfortunately, customer is out of town due to school holidays here.

td-d · **Posted:** Thu Sep 27, 2012 9:05 am

throttlehappy wrote:

Can do but it will not be for a week unfortunately, customer is out of town due to school holidays here.

No worries, when you can.

td-d · **Posted:** Thu Sep 27, 2012 11:09 am

To give you an idea of the complexity of this logic, here's one of the main routines involved with AVLS. I've now picked up on the section responsible for CEL codes P0026 and P0028 as well.

throttlehappy · **Posted:** Mon Oct 01, 2012 4:48 am

Assuming P0076/P0077/P0082/P0083 are also related to VVL?

td-d · **Posted:** Mon Oct 01, 2012 5:14 am

throttlehappy wrote:

Assuming P0076/P0077/P0082/P0083 are also related to VVL?

I would assume, since they relate to the intake valve (and the OSV).

OldhaQ · **Posted:** Wed Oct 17, 2012 7:27 am

I'm willing to do some testing for you, and learn at the same time.
Mine's the OUTBACK_MY04_ADM_3.0R_5EAT.hex that you and throttlehappy did the def for recently.
I'm just waiting for the logger update now, dshultz said it should be ready by this weekend.
I usually drive 100km+/day Mon-Fri if that helps too.

Rob

td-d · **Posted:** Wed Oct 17, 2012 7:48 am

Great Rob - I'll track it down on your Rom and post some stuff up to test.

td-d · **Posted:** Wed Oct 17, 2012 3:36 pm

Ok Rob - I've attached an Ecuflash definition that has the 'starter pack' for VVL - the RPM thresholds, minimum RPM for low mode, and the OSV duty thresholds.

Matt has given some pointers earlier in this thread how to start playing around with the figures for power, would be interesting to also get 'butt dyno' feedback. As he said - don't drop the minimum RPM floor for low mode lower than the current limit of 3000 RPMs - would be interesting to raise it temporarily to confirm that this is indeed the 'floor' value.

I doubt the OSV values need tweaking, but would be interesting to change them by 1 or 2 percentages to verify that these are indeed the OSV values.

I'll start pulling together some experimental logger addresses to check as well - just bushed tonight, long day at work...

td-d · **Posted:** Sat Nov 03, 2012 6:33 am

Any feedback on this?

throttlehappy · **Posted:** Sat Nov 03, 2012 9:19 am

Tomorrow is my day for VVL testing

2.5i Forester

OldhaQ · **Posted:** Sat Nov 03, 2012 10:41 am

Sorry for the delay.
can definitely feel power come on sooner, had VVL threshold set 3100-3300 for the 2nd attached log.
Coming on 700rpm sooner made a big difference to getting going.
Haven't tried raising VVL threshold yet, but have dropped it to 3000-3150 recently.
I seem to be getting a lot of knock adjustment, which timing map should I adjust first?

throttlehappy · **Posted:** Sat Nov 03, 2012 8:53 pm

OldhaQ wrote:

Sorry for the delay.
can definitely feel power come on sooner, had VVL threshold set 3100-3300 for the 2nd attached log.
Coming on 700rpm sooner made a big difference to getting going.
Haven't tried raising VVL threshold yet, but have dropped it to 3000-3150 recently.
I seem to be getting a lot of knock adjustment, which timing map should I adjust first?

All of the H6's knock pretty badly in stock form, straight up I would halve the Knock Correction Advance A table and remove any peaks

KCA B table needs below 3200 timing peaks removed then smooth out the area above 3200

td-d · **Posted:** Sun Nov 04, 2012 6:19 am

Would be interesting to log a number of WOT runs side by side with different trigger points, and to log engine load to get an idea of the impact on torque. As a matter of interest, is there a reason you are logging so many variables? Looks like you were trying to trouble shoot something?

So Matt - other than the Rpm and OSV duty thresholds, in tuning other platforms, which other thresholds would practically be useful? I ask because there are many, many thresholds, some of which are related to CELs which may not really be required from a tuning point of view.

RomRaider

VVL thresholds / parameters / logic

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