Fascinating makes me wonder if you even have a real problem. Does the car experience any shuddering or lack of power in these moments? The injector pulse widths aren't changing much and neither is RPM but the wideband is going nuts.

I suppose a decent exhaust leak could trick the wideband into believing its going lean. Really kinda odd given the data other opinions needed.

 

I apologize, I just realized I posted the wrong log. That log was for the omni power thread.

A better question suited for this thread would be a bad lean condition I have had for a while that occurs at around 1500rpm, and that rich condition while cruising mentioned earlier. I tried to raise the settings in the "asynch_accel_vsRPM" table which had no positive results. The car does lack power when it reads lean, and is pretty jerky. I've also checked for ehaust leaks and can find nothing. Am I using this table the right way?

Here's a couple of logs with those issues:

 

Sounds to me like you are bouncing between fuel trims. When they are far apart it can change fueling very quickly at low throttle/low rpm. BTW, that tps you referred to is probably idle/resting. Most evos TPS rest @ 13.3% or so (which would possibly further validate the trim problem). At that low of throttle I don't think accel enrichment is going to change much for you.

This could also be an issue related to your MAF Scaling.

 

Wait, which problem are you talking about? The rich on cruise, the lean at 1500rpm, or both? Those issues did not occur at 13.3% on the tps. The rich on cruise was at about 22% (at any rpm) and the lean at 1500rpm started at around 32% throttle then continued to almost 90%.

I also thought it was my maf scaling, but all driving conditions outside of where the issues lie log perfectly between the wideband and the afrmap. For instance, highway cruising and wot pulls are within 3 tenths difference between the wideband and afrmap. I've also got closed loop disabled so that I can better control lean spool.

I realize I may have what your saying completely misconstrued, so please if I'm missing something feel free to explain away. Thanks.

 

1. Why are you running only open loop? Closed loop fueling under cruise conditions is ideal for fuel economy and the air we breathe.
2. The proper way to disable lean spool is thru the periphery bits.

 

Oh? I thought the best fuel economy was at 15.2. As far as emmissions, I don't think it'll matter since I use a test pipe. I've turned off both the perihpery bit, and set the open loop load to "0" to disable closed loop.

 

This is OT but I get 19-20 mpg in mixed driving and 23+ on the highway. I keep both closed loop and lean spool active.

 

As long as I keep it out of the aformentioned rich area, my max is 24mpg combined and 32mpg highway. I changed it because I was getting gas mileage right along the lines where yours is now. Also, I re-enabled closed loop and I'm still seeing the afr go very lean at 1500rpm at between 40% - 90% throttle.

 

Should these tables work for cars that don't have the speed density conversion?

 

Thats precisely why i started finding them so yes :P

In my experience these tables work when stepping on the gas not the stepping off part. If your going lean with speed density when letting off the throttle perhaps the issues is more how the map vs load table is setup than these tables.

 

I'm not using speed density, but I am using the omni power 4 bar map sensor, which after installing is when that lift off lean condition started. I guess I should mess around with it a little more.

The problem with the lean condition at 1500rpm was there since I put the cams in. BTW: I tuned the maf on cruise, so airflow should be correct. Adjusting open loop tables doesn't work, and I wanted to add fuel at 1500rpm. After adding fuel using the asynch accell table, I got zero results. All I should have to do is add to the "asynch_accell_vsRPM" in the 1500rpm section correct? Thanks.

 

Ah i don't know why i missed that in your origional post sorry

Yes they are OEM tables so they will work with the stock maf system. There are probably tables sperate for the decelleration routine.

Out of extreme curiousity have you just tried forcing open loop all the time, with the bit in the FAA bits set to 0. At least that way you could see what the tune is really doing before closed loop has time to mess with it.

On a curious side note your lean problem happens around those spots where the EGR is supposed to be kicking in.

 

Rom IDs:
96530006
96530706

XML:
<table name="Accel Enrich Base vs Engine Temp" category="Fuel" address="3856" type="2D" level="2" scaling="uint8">
<table name="Engine Temp" address="69be" type="X Axis" elements="8" scaling="Temp"/>
</table>

<table name="Asynch_Acell_Enrichment" category="Fuel" address="1654" type="2D" level="1" scaling="uint16">
<table name="X" type="Static Y Axis" elements="5">
<data>pause_period</data>
<data>min_TPSdelta</data>
<data>Max_pulsewidth</data>
<data>idle_TPSRange</data>
<data>after_engine_start_addition</data>
</table>
</table>

<table name="Asynch_VS_TPSDELTA" category="Fuel" address="38a2" type="2D" level="1" scaling="uint8">
<table name="X" type="Static Y Axis" elements="9">
<data>0</data>
<data>1</data>
<data>2</data>
<data>3</data>
<data>4</data>
<data>5</data>
<data>6</data>
<data>7</data>
<data>8</data>
</table>
</table>

<table name="Asynch_TPS(Rpm) Limit" category="Fuel" address="38b2" type="2D" level="1" scaling="WGDuty">
<table name="X" address="6622" type="Y Axis" elements="10" scaling="RPM"/>
</table>

<table name="Asynch_Accel_vsRPM" category="Fuel" address="38d0" type="2D" level="1" scaling="uint8">
<table name="X" address="6622" type="Y Axis" elements="15" scaling="RPM"/>
</table>

 

Have you found that any of these settings influence the afr when hitting peak load? I don't have problems when getting into the throttle or letting off, but when the car hits peak load it goes rich for a bit.

 

I played with some of the tables and didn't notice any change in the rich dip when getting on the throttle.