You can see that in PE CMND AFR starts out at 11.7 and drops down closer to rev limiter, Ive been trying to figure out why this is happening.
Mult vs. RPM all set to 1
ECT is set to 11.7 above 68 degrees.
Is it possible there's some other PE parameter that we can't see with HPT? I can PM a link to my file for anyone interested. Thanks for looking.
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
By lower do you mean richer?
2004 Cavalier coupe, 5 speed, White
GO
Hahn Stage 2, Eagle rods, Wiseco 8.9, SS Valves, Dual valve springs, valve job, Ti seats and retainers
spec stage 3, Fidanza 7.5lb flywheel, Short Shifter
Slotted and dimpled rotors, EBC green stuff
SHOW
VIS EVO CF hood, KOBE KAM 5 17", Nexxen N3000, Ebay Black tails and filler, 5% tint
Gold line springs, Tokiko D-spec struts
ELECTRONICS
Kenwood in-dash DVD and Navigation, single Kicker CompVR
http://www.cardomain.com/ride/2974835
what are your fuel trim tables set at around that point... maybe that will show something.
1997 RedR - ZedR
whitegoose( RedR-ZedR) wrote:what are your fuel trim tables set at around that point... maybe that will show something.
Fuel trim tables, this is in PE Mode, Do you mean VE Tables? That shouldn't have anything to do with CMND AFR.
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
Sounds like your injector constant is the tiniest bit off. Or your Fuel pressure regulator is a tad too high. Just some Ideas.
2004 Cavalier coupe, 5 speed, White
GO
Hahn Stage 2, Eagle rods, Wiseco 8.9, SS Valves, Dual valve springs, valve job, Ti seats and retainers
spec stage 3, Fidanza 7.5lb flywheel, Short Shifter
Slotted and dimpled rotors, EBC green stuff
SHOW
VIS EVO CF hood, KOBE KAM 5 17", Nexxen N3000, Ebay Black tails and filler, 5% tint
Gold line springs, Tokiko D-spec struts
ELECTRONICS
Kenwood in-dash DVD and Navigation, single Kicker CompVR
http://www.cardomain.com/ride/2974835
at 89% injector duty cycle your injectors could be cliping open.
and even if thats not it, its time for bigger injectors.
"
boobs now with Riboflabin"
Darryn DiSanto wrote:Sounds like your injector constant is the tiniest bit off. Or your Fuel pressure regulator is a tad too high. Just some Ideas.
What does FPR have to do with calculated CMND AFR?
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
Well the question you asked was interpreted by me to mean that you cant get the car to hit the commanded AFR that you want. I was letting you know that it could be a fuel issue. As did JCAVI.
Asking a better question will get you better answers.
Darryn
2004 Cavalier coupe, 5 speed, White
GO
Hahn Stage 2, Eagle rods, Wiseco 8.9, SS Valves, Dual valve springs, valve job, Ti seats and retainers
spec stage 3, Fidanza 7.5lb flywheel, Short Shifter
Slotted and dimpled rotors, EBC green stuff
SHOW
VIS EVO CF hood, KOBE KAM 5 17", Nexxen N3000, Ebay Black tails and filler, 5% tint
Gold line springs, Tokiko D-spec struts
ELECTRONICS
Kenwood in-dash DVD and Navigation, single Kicker CompVR
http://www.cardomain.com/ride/2974835
does your boost also taper off?
LE61T PTE6262 Powered 
BlackEco wrote:You can see that in PE CMND AFR starts out at 11.7 and drops down closer to rev limiter, Ive been trying to figure out why this is happening.
I dont know how the question could be any more clear.
Ignore the wideband, I am simply wondering why CMND AFR is not constant. I am not concerned about actual AFR or what VE is doing.
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
QBE (Aka Phil No More Boost) wrote:does your boost also taper off?
No boost is at 10psi solid with no spikes, but that isn't relevant here, my question concerns CMND AFR.
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
i was only asking because the ecu can only adjust fuel levels so much on it's own, so that may be why the cmnd afr drops. but if your asking why it changes on it's own, that idk. I had a good idea why, but apparently I was going at it wrong
LE61T PTE6262 Powered
Well if you have it all set to 1 for the multipliers then I am going to have to agree with Phil and say that I haven't the slightest clue why it would do that. you could try changing the multipliers to something like 1.01 and see what that does for you.
2004 Cavalier coupe, 5 speed, White
GO
Hahn Stage 2, Eagle rods, Wiseco 8.9, SS Valves, Dual valve springs, valve job, Ti seats and retainers
spec stage 3, Fidanza 7.5lb flywheel, Short Shifter
Slotted and dimpled rotors, EBC green stuff
SHOW
VIS EVO CF hood, KOBE KAM 5 17", Nexxen N3000, Ebay Black tails and filler, 5% tint
Gold line springs, Tokiko D-spec struts
ELECTRONICS
Kenwood in-dash DVD and Navigation, single Kicker CompVR
http://www.cardomain.com/ride/2974835
because I had the exact same problem as you. My cmnd afr would drop after like 6k rpms because my boost would drop about 2 psi. Now I was 6 psi higher then you. But thats why ahd such a problem tuning. I would get perfect afr's from full boost of 3k - 6k but after that I would run really rich cause my boost taperd from 18 - 16 or from 14 to 12
LE61T PTE6262 Powered
Darryn DiSanto wrote:Well if you have it all set to 1 for the multipliers then I am going to have to agree with Phil and say that I haven't the slightest clue why it would do that. you could try changing the multipliers to something like 1.01 and see what that does for you.
Yeah your right, I could use the multiplier to fix it, but it just doens't make sense since they are 1x across the board and I don't know what other variable could be effecting it. To me it seems there's something HPT left out of the AFR CMND parameters for us to set.
Phil do you have any logs saved, cmd afr should not be effected at all by boost, its all calculated static values.
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
I noted this same thing with a LD9 I tuned. It would start off at 13:1 & richen to 12.5:1 .
I suspect that the J-Bodies have an adder table similar to the one in my wife's Grand Am which richens the AFR based on how long you've had it to the mat.
Tire Industry Association (TIA) Advanced Tire Service Instructor
Graduate of Michelin Advanced Sales Training
Graduate of Rod Hall Off Road Driving School
Graduate of Vehicle Driving Dynamics, Michelin Laurens Proving Grounds.
2002 Ford Ranger Edge Extra Cab, Flareside
3.0L V6, 5 spd auto.
Bamachips Xcal2
160 hp, 196 ft/lbs (crank)
31X10.5R15 Bridgestone Dueler A/T 693
K&N flat panel
Custom side exit exhaust
Monroe Max Air Shocks
Infinity 6" Component Speakers
Credence 10" DVC sub
Dual Amp
Custom built passive x-over & sub enclosure
you dont want to go much higher than low 12s on AFR at any time its when you go lower significantly than 11.5 that your losing some power but its better to be richer than in the 13s on AFR, that range breaks things
11.5-12.0 is tad rich but its about as safe as you can be, by trimming off some fuel delivery where you go under 11.7 that will lower your duty cycle safer also
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
I finally got to the bottome of this! Go to your PE Mult vs. RPM table & increase the precision to 2 decimal places. The car I was dealing with showed 1's straight across the board also until I increased the precision in that table. After increasing the precision, the Multiplier turned out to actually be .96, not 1. 13.0:1 X .96 = 12.5:1.....exactly what was being commanded at those rpms.
Tire Industry Association (TIA) Advanced Tire Service Instructor
Graduate of Michelin Advanced Sales Training
Graduate of Rod Hall Off Road Driving School
Graduate of Vehicle Driving Dynamics, Michelin Laurens Proving Grounds.
2002 Ford Ranger Edge Extra Cab, Flareside
3.0L V6, 5 spd auto.
Bamachips Xcal2
160 hp, 196 ft/lbs (crank)
31X10.5R15 Bridgestone Dueler A/T 693
K&N flat panel
Custom side exit exhaust
Monroe Max Air Shocks
Infinity 6" Component Speakers
Credence 10" DVC sub
Dual Amp
Custom built passive x-over & sub enclosure
Shane Hewitt wrote:I finally got to the bottome of this! Go to your PE Mult vs. RPM table & increase the precision to 2 decimal places. The car I was dealing with showed 1's straight across the board also until I increased the precision in that table. After increasing the precision, the Multiplier turned out to actually be .96, not 1. 13.0:1 X .96 = 12.5:1.....exactly what was being commanded at those rpms.
I also found this table the other day (never looked at it before). I had forgot about this post so did not think of coming in here to post about it. I have yet to play with it.
FU Tuning
Shane Hewitt wrote:I finally got to the bottome of this! Go to your PE Mult vs. RPM table & increase the precision to 2 decimal places. The car I was dealing with showed 1's straight across the board also until I increased the precision in that table. After increasing the precision, the Multiplier turned out to actually be .96, not 1. 13.0:1 X .96 = 12.5:1.....exactly what was being commanded at those rpms.
Cool, figures it was something stupid like that but know we know. I will check out my tune tonight, THANKS for posting up what you found, now I can go correct mine.
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
i wish i could do the command air/fuel but when i did that and followed all the stickies instructions my car just died so i ened up changed all my 100% throttle tables higher. OR is that how ur supposed to do it? lol
BOOSTED BABY wrote:i wish i could do the command air/fuel but when i did that and followed all the stickies instructions my car just died so i ened up changed all my 100% throttle tables higher. OR is that how ur supposed to do it? lol
Wrong
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Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
Your commanded AFR is a setting in HPT, its completely off the PE table, boost one way or the other has no affect on the "commanded" afr of the pcm, sure boost will affect the actual AFR, its not mysterious its doing what your telling it to
A good setting for the PE AFR is 11.8, assuming your VE and constants are on it should be right there, I have noticed in ecos running turbos that in order to fuel the upper rpms and higher boost a small ratio FMU helps out, simply upping the VE offset to add more fuel screws up the idle, with alot of cars under 7-8psi its never an issue but on Phil's car running 14 or whatever it sure was a real problem, we never got the chance to put the FMU back on and sort things out before he grenaded another tranny
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
