Auto VE trouble (yes another one)

[SCP Perf]

I am working on my first tune using EFIlive and have been trying to read as much as possible. Fortunately/unfortunately there is alot (actually an overwhelming amount) of information on this forum, and I am not sure what I am doing wrong.

I have access to a load bearing dyno that I have been using to do the auto VE process.

Car being tuned: 2001 Camaro
LSX block bored out to 427
Patriot Heads
82mm throttle body
Stock MAF
Fast 36lb/hr injectors
Stock fuel pump with racetronix "hotwire" at 65PSI(?)
Base tune purchased for motor break-in

When I started with his car in the Auto VE process, it was showing in excess of 20% lean (BEN's of 1.22) even with the 15% for the Auto VE process. I didn't run it very long like this and added the 20% across the board. BEN's started showing less than 10%. After this point the BEN's have been very erratic and seems to be over compensating when I multiply to the B0101 table. After Struggling with this for several iterations, I decided to just hand smooth the table to get rid of any severe peaks/vallys, and most of the BEN's were pretty close. I did some small adjustments and the BEN's went back to 1.12 range. I don't understand why they are jumping around so much.

I am using a PLX WBO2 from the dyno which I haven't had any issues with erratic readings (I think it might be reading rich)

Our plan was to get a fuel pressure gauge and try to watch what it is doing during the tuning cycles. Here are a couple of the logs if someone could point me in the right direction. I am sure there will be requests for more info so please let me know if you need any more detail.

[mr.prick]

Which injectors are those?
It looks like just the IFR was changed, the offsets should be changed too.

The PLX output of ({EXT.AD1}*2)+10 is for EQ1=14.7 and does not match perfectly to {B3601}.
That may be one reason why BEN is "over compensating"
Setting {B3601} to 14.681005 will get it closer to the PLX PID or
you can make a calc_pid to match {B3601}
Lambda output for the PLX is ({EXT.AD}*0.1360)+0.680 if you want to go that route.

I would set {B3605} to 1.00EQ from 158F down and set {B3618} to 1.176EQ
This way commanded AFR does not doesn't hop around solely on MAP and
you can more easily control when AFR is to be richer.

[joecar]

SCP, welcome to the forum...

Do you have FlashScan V1 or V2...?

[joecar]

Set these to in-range values:

Out of Range calibration summary: 12:21:36 am, Friday Apr 02, 2010

Engine Calibration.AIR Pump
{B0203} AIR Pump Coolant Temp Disable, was out of range when loaded.

Transmission Calibration.CARS/CAGS
{D0407} CARS Coolant Temp Enable, was out of range when loaded.

[joecar]

Set B3618 to a richer value 1.176EQ (AFR 12.44), like mr.prick said... and watch out for knock...!!

Also set B3609 to zeros... (this time is in addition to B3608).


Are you applying a transient filter to the BEN map...?

[joecar]

Can you test your PLX by running a known stoich AFR...?

Does car have NBO2 sensors...? If so, then enable B4206 and see if the WB AFR converges on 14.63 (and then remember to disable B4206 before proceeding).

[joecar]

Also log these:
GM.DYNCYLAIR_DMA
GM.DYNAIR
HO2S11 (if car has them)
HO2S21

[joecar]

Yes, see what rail pressure is doing with different loads.

This is still a returnless system, right...?

[joecar]

In log 11, the wideband AFR is not following commanded AFR at all... something is wrong...

[SCP Perf]

Which injectors are those?
It looks like just the IFR was changed, the offsets should be changed too.
Injectors are FAST brand. What do I need to adjust the offsets to?
The PLX output of ({EXT.AD1}*2)+10 is for EQ1=14.7 and does not match perfectly to {B3601}.
That may be one reason why BEN is "over compensating"
Setting {B3601} to 14.681005 will get it closer to the PLX PID or
you can make a calc_pid to match {B3601}
Lambda output for the PLX is ({EXT.AD}*0.1360)+0.680 if you want to go that route.
I can adjust {B3605} to match closer.
I would set {B3605} to 1.00EQ from 158F down and set {B3618} to 1.176EQ
This way commanded AFR does not doesn't hop around solely on MAP and
you can more easily control when AFR is to be richer.
I understand, but why does the auto VE say to command stoich in the {B3618}?

Thanks for the input Mr. Prick