AFR is rich coming out of PE in the low MAP areas (<40kPa).
This is only when the throttle is shut quickly,
if the throttle is steadily reduced AFR is what it should be.
Will {B3426}_{B3428} or {B3406} correct this?
AFR is rich coming out of PE in the low MAP areas (<40kPa).
This is only when the throttle is shut quickly,
if the throttle is steadily reduced AFR is what it should be.
Will {B3426}_{B3428} or {B3406} correct this?
512k RoadRunner Firmware 12.14R
FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
LC-1 WBO2
_________________________________________________
None of those?
In the E38, we have
B2011: Wall Wetting Asymmetry Factor
Determines the amount of port wall wetting dependent on acceleration or deceleration states.
Lower number will provide no compensation when deceleration is occurring.
This has a marked effect on the close throttle rich spike and is what I have used to get rid of it.
But COS3 doesn't have that particular table so it's going to be a bit tricky. I'd probably try....
- B3416: Wall Wetting Min TPS: You may be able to set this so that on throttle close it disables dynamics. It may upset the throttle opening though.
- B3401: Evaporation Time: Given that MAP would be low, you should be able to adjust the evaporation times to help. I'm guessing that a longer evaporation time in the low MAP cells would make the PCM add less fuel on transients as it would think there is more fuel left over from previous injection events.
But if your dynamics are right for throttle opening, I don't think there is a lot you can do without an asymmetry table like the E38.
Simon.
512k RoadRunner Firmware 12.14R
FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
LC-1 WBO2
_________________________________________________
Does that also alter the "throttle open" fueling? If not it's a good fix!
BENs are slightly lean in throttle tip and the cell count is low
My WBO2 is a bit far back in the exhaust,
however I have noticed BENs are near perfect even with MAP increase.
This leads me to believe that exhaust gas moves fast enough to almost keep up with
MAP data.
The few lean cells are not consistently lean they do see rich AFR as well
just not enough to balance out the lean.
On a side note: cells in the lower MAP kPa that are rich are also of low cell count.
but I know they are accurate because they are consistent for log to log.
Last edited by mr.prick; September 27th, 2009 at 11:55 AM.
512k RoadRunner Firmware 12.14R
FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
LC-1 WBO2
_________________________________________________
No dice, {B3401} didn't change anything.
512k RoadRunner Firmware 12.14R
FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
LC-1 WBO2
_________________________________________________
512k RoadRunner Firmware 12.14R
FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
LC-1 WBO2
_________________________________________________
For the 'tip-in's'...I found using the 'impact factor modifier' {B9116} table works well.
Howard
YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
DUCT TAPE.
IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.
98 K1500 'HOLDEN' Suburban.
Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit
Remember that for tip in, air flow is initially low, therefore the WB AFR will lag a little until airflow pics up. You can see this if you set the stomp setting significantly higher and end up with a rich spike on tip in. If this is done you can see you have commanded too much fuel but it will still lag the commanded AFR in the log.
The rich AFR on throttle close is what the "asymmetry factor" table fixes in the E38. I'm not sure if any of the table available with the Ls1 controller will help here.
The final point is possibly being affected by two things...
- B3248: Stomp reduction decay rate may be a bit slow to pull back the stomp commanded fuel.
- As air flow speed has dropped again, the WB is possibly lagging the commanded and reading the left over rich mixture from PE.
The lean tip in does not worry me so much
it's the damn throttle slam rich AFR that I want to cure.
Tip in is less depending on what gear and/or RPM I'm in at the time.
WBO2 lag is going to be there but looking at my logs
I can see the lag really is minute.
IPW drops along with TP% so why would AFR spike so rich when the
throttle slams shut?
Maybe injector offsets need to be changed in the low MANVAC areas?
Any suggestions on how to filter/apply data?
I made a frame count pid to narrow down the sections with the spikes.
512k RoadRunner Firmware 12.14R
FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
LC-1 WBO2
_________________________________________________