Injector scaling vs actual afr in close loop? Also does ve change closed loop fueling
#1
Injector scaling vs actual afr in close loop? Also does ve change closed loop fueling
If your injectors are scaled properly and tightly in fuel trims does that mean you will see an approximate afr reading near stoich? I ask because I am having a very hard time scaling my pte 1000cc injectors . I also rescaled the ~v table to match what pte had sent me for latency times.
It definitely acts like when my injectors get closer to 0 fuel trims that the car will not be any closer to stoich at idle. The problem here is my cams and I have tweaked my sd map a bit and does t ever change . I idle at ~16.4
Also does your ve table effect closed loop?
It definitely acts like when my injectors get closer to 0 fuel trims that the car will not be any closer to stoich at idle. The problem here is my cams and I have tweaked my sd map a bit and does t ever change . I idle at ~16.4
Also does your ve table effect closed loop?
#4
Evolving Member
iTrader: (7)
VE does affect everything.
Adjust your maf comp on the two lowest cells (19 hz and 25 hz) a bit until you get stoich if you have to make HUGE changes to the VE at 500 and 1000 RPM.
If your trims are close to 0 at idle yet your WB02 reports 16's, you may have a bad/miscalibrated WB02 or a bad upstream O2 sensor. The EVO ecu is pretty good at getting stoich AFR's when the trims are close to zero at idle. Just saying .
Adjust your maf comp on the two lowest cells (19 hz and 25 hz) a bit until you get stoich if you have to make HUGE changes to the VE at 500 and 1000 RPM.
If your trims are close to 0 at idle yet your WB02 reports 16's, you may have a bad/miscalibrated WB02 or a bad upstream O2 sensor. The EVO ecu is pretty good at getting stoich AFR's when the trims are close to zero at idle. Just saying .
Last edited by evoredy; Dec 16, 2012 at 06:42 PM.
#5
Im here because ive used the AEM uego and LC1, on top of two brand new OEM replacements. This has been goin on for a couple years now and Im kinda at wits end getting the fuel map dialed in.
I can dial my VE in to get stoich real easy but once I enable CL its maxing trims easily.
I DONT understand a negative fuel trim low, on top of a lean AFR. Why would the ecu be pulling fuel only to accomplish getting a lean value????
I can dial my VE in to get stoich real easy but once I enable CL its maxing trims easily.
I DONT understand a negative fuel trim low, on top of a lean AFR. Why would the ecu be pulling fuel only to accomplish getting a lean value????
Last edited by 211Ratsbud; Dec 16, 2012 at 07:11 PM.
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#10
Evolving Member
iTrader: (7)
1) you can adjust your MAF COMP a little (lot) more that you have done.
2) try my latencies for PTE 1200's as a starting point which net me excellent drivability and idle (even on e85) get ready for a retune lol. if your happy with your current tune, just work with your MAF COMP values until you/the ecu finds stoich. then adjust your VE, fuel, and load to open/closed loop tables to dial in the tip-in. also, verify your exhaust is well sealed as a pinhole downstream will affect the upstream readings at idle more than one thinks:
3.312
2.184
2.088
1.296
0.792
0.72
0.48
scaling: 1044 (you will have to go down on this as per the 1000cc/min rating).
Good luck man. Idle and tip in took me a while to dial in on my EVO.
#11
Former Sponsor
iTrader: (12)
When you are in closed loop at idle and it seems to be stabilized, what does your Wideband read? I see variances between wbo2 and the front o2 trims all the time when people have small exhaust leaks anywhere from the o2 housing to the Wideband sensor. If the gasket between the turbo and o2 housing is leaking, your front o2 sensor AND your Wideband will be reading incorrectly.
-Jamie
-Jamie
#13
When you are in closed loop at idle and it seems to be stabilized, what does your Wideband read? I see variances between wbo2 and the front o2 trims all the time when people have small exhaust leaks anywhere from the o2 housing to the Wideband sensor. If the gasket between the turbo and o2 housing is leaking, your front o2 sensor AND your Wideband will be reading incorrectly.
-Jamie
-Jamie
Todd's settings and advice seems to be where I'm headed which is close to what evoredy said too
Last edited by 211Ratsbud; Dec 17, 2012 at 03:17 PM.
#14
Evolving Member
iTrader: (7)
My evo did that when I had a hairline crack in the header right at the collector. It made me go crazy. I had lean tip-in like crazy too. Any puff of air in the header/turbo area will do it no matter how small. I actually feel with my fingers at idle when I'm sketched out now heh. Inspect inspect inspect.
But really, good luck...seems like you have a good plan and someone with PTE 1000cc injector experience. Now I'm gonna shut up and go ebay an e85 content sensor lol...
But really, good luck...seems like you have a good plan and someone with PTE 1000cc injector experience. Now I'm gonna shut up and go ebay an e85 content sensor lol...