Deceleration Fueling / Overrun RPM cutoff threshold tables

discomfort · **Joined:** Fri Aug 10, 2012 8:44 pm **Posts:** 54

Had a slight feeling you would say that. I will get in touch with them, thanks!

discomfort · **Joined:** Fri Aug 10, 2012 8:44 pm **Posts:** 54

No reply from either :cry:

dybal · **Posted:** Wed Sep 19, 2012 4:18 pm

The tables look OK in my ROM, but at ~90C ECT my car resumes fuel injection at 1200 rpm and not the 900 rpm that's in the table.

td-d · **Posted:** Wed Sep 19, 2012 5:24 pm

dybal wrote:

The tables look OK in my ROM, but at ~90C ECT my car resumes fuel injection at 1200 rpm and not the 900 rpm that's in the table.

Post up your rom, I'll have a look.

dybal · **Posted:** Wed Sep 19, 2012 5:50 pm

td-d wrote:

dybal wrote:

The tables look OK in my ROM, but at ~90C ECT my car resumes fuel injection at 1200 rpm and not the 900 rpm that's in the table.

Post up your rom, I'll have a look.

A8DK100E: http://www.romraider.com/forum/download/file.php?id=5894

Thanks!

td-d · **Posted:** Wed Sep 19, 2012 7:46 pm

dybal wrote:

td-d wrote:

dybal wrote:

The tables look OK in my ROM, but at ~90C ECT my car resumes fuel injection at 1200 rpm and not the 900 rpm that's in the table.

Post up your rom, I'll have a look.

A8DK100E: http://www.romraider.com/forum/download/file.php?id=5894

Thanks!

If you can, in other words, if it's not commercially tuned - post up your specific rom - so I can have a look at it.

td-d · **Posted:** Wed Sep 19, 2012 8:02 pm

dybal wrote:

td-d wrote:

dybal wrote:

The tables look OK in my ROM, but at ~90C ECT my car resumes fuel injection at 1200 rpm and not the 900 rpm that's in the table.

Post up your rom, I'll have a look.

A8DK100E: http://www.romraider.com/forum/download/file.php?id=5894

Thanks!

This is the table in your rom - looks like you got it right. Post a log, that might help troubleshooting.

Code:

ROM:0008B014 word_8B014:     .data.w h'10            ; DATA XREF: sub_33ECC:loc_34074o
ROM:0008B014                                         ; sub_33ECC:off_34140o
ROM:0008B016                 .data.w h'800
ROM:0008B018                 .data.l flt_C7A24
ROM:0008B01C                 .data.l word_C8C8C      ; = 2.4e3
ROM:0008B020                 .float 0.1953125
ROM:0008B024                 .float 0.0

dybal · **Posted:** Wed Sep 19, 2012 9:07 pm

Yesterday as I drove home (logging, as always I do when I drive alone) I had a half dozen parameters in the dashboard tab... when the traffic was light enough, I would close the throttle, let the car coast and watch the notebook to see at what rpm it resumed fueling... did it several times and it always resumed fueling around 1200rpm.

Now I browsed the log looking for instances of decel and I had to scroll down a bit to find it... at the start of the log, all examples of decel resume fueling at 900rpm... the first example of resuming fueling at higher rpm comes around ~273000 ms, at 1600rpm... later around 310000ms there are examples where it resumed fueling at 1200rpm.

I didn't log ECT, but I would guess that after 3 or 4 minutes the ECT should be around 90C.

td-d · **Posted:** Wed Sep 19, 2012 10:09 pm

It's resuming fueling because you're back on the accel pedal - overrun resume is the 'floor' at which the injectors will switch back on regardless of pedal input (I.e. heading to idle).

In other words, it's working fine.

dybal · **Posted:** Thu Sep 20, 2012 1:32 pm

You are right, the examples I picked form the log were wrong... they weren't what I saw while driving.

Anyway, I found what was the problem while driving to work today (me! :oops:

)... it resumes fueling at 900rpm when A/C is off and at 1200rpm when A/C is on.

Thanks for the help (and sorry for the waste of time!)

Dybal

td-d · **Posted:** Thu Sep 20, 2012 4:51 pm

dybal wrote:

You are right, the examples I picked form the log were wrong... they weren't what I saw while driving.

Anyway, I found what was the problem while driving to work today (me! :oops:

)... it resumes fueling at 900rpm when A/C is off and at 1200rpm when A/C is on.

Thanks for the help (and sorry for the waste of time!)

Dybal

No problem - your observation actually is an important one - it likely means that there is an additional tables that is adjacent that is used for high load / AC conditions (which I believe I have seen before). So thank you for that!

awdturbo04 · **Joined:** Sat Jul 14, 2012 7:37 pm **Posts:** 38

has anyone had any luck defining these for A2ZJe11J

I ended up drilling a hole in my throttle plate which actually worked really at keeping it from stalling from the super-rich condition on decel but I have inadvertently caused the car to slightly continue to accelerate for a brief second when lifting the throttle. It’s not terrible but it drives me nuts.

td-d · **Posted:** Fri Oct 05, 2012 5:29 pm

I'll dig them out for you.

awdturbo04 · **Joined:** Sat Jul 14, 2012 7:37 pm **Posts:** 38

td-d wrote:

I'll dig them out for you.

That would be fantastic I can't wait to play with those tables. I am thinking about scaling by the same scalar that I modified my tip in by

td-d · **Posted:** Sat Oct 06, 2012 3:40 pm

awdturbo04 wrote:

td-d wrote:

I'll dig them out for you.

That would be fantastic I can't wait to play with those tables. I am thinking about scaling by the same scalar that I modified my tip in by

Code:

Table_Overrun_Fuel_Resume_RPM:.
X axis C60E0
Table C6C14     

ROM:000C5FD0 Overrun_fueling_RPM_Delta:.float -17.0  
ROM:000C5FD4 Overrun_fueling_initial_enrichment:.float 0.0 

ROM:000C6000 Overrun_Fueling_Cut_Counter_RPM_Threshold:.float 2000.0
ROM:000C6004 flt_C6004:      .float 2500.0 
ROM:000C6008 flt_C6008:      .float 3000.0 

RomRaider

Deceleration Fueling / Overrun RPM cutoff threshold tables

Who is online