Crazy AFR's LEan on low end--hella rich on top
#1
F**K THE SYSTEM!!
Thread Starter
Crazy AFR's LEan on low end--hella rich on top
Ok. Ill give you guys an idea of my mods.
I have a BNR stage 4. at 7-8 psi only.
550 primaries and 720 seconds with aeromotive FPR.
I have a stock ECU.
Ok we hooked up my bros innovative wideband and the results were a bit a strange.
AT idle im getting 14.0 +- afr's
AT normal driving under 3,000 rpms its hella lean 14.0(this one worries me most- because when im grandma driving slowly picking up speed without even hitting boost [granny driving in vacuum only] and its hella lean. BUT when i get to the destined cruising speed when i barely have to hit the gas it goes to the 11.0+- afr's
AT WOT im getting 10.2 afr's
Can anyone explain why my afr's on partial throttel is so lean?
I have a BNR stage 4. at 7-8 psi only.
550 primaries and 720 seconds with aeromotive FPR.
I have a stock ECU.
Ok we hooked up my bros innovative wideband and the results were a bit a strange.
AT idle im getting 14.0 +- afr's
AT normal driving under 3,000 rpms its hella lean 14.0(this one worries me most- because when im grandma driving slowly picking up speed without even hitting boost [granny driving in vacuum only] and its hella lean. BUT when i get to the destined cruising speed when i barely have to hit the gas it goes to the 11.0+- afr's
AT WOT im getting 10.2 afr's
Can anyone explain why my afr's on partial throttel is so lean?
#5
Dark Lord of the Drift
iTrader: (3)
DOOOD, you're supposed to be 14.0 - 14.7 or so at idle and stay in that range until you hit boost. Then you're supposed to get progressively richer. 11.0 -12.0 when over 10psi. These numbers are just a guideline.
If you're cruising speed / RPM is over 3800, those secondaries will come alive and since they are 720's you will go considerably richer than when you had 550's.
Make sure you have a fuel pump, and also make sure that you set the regulator pressure (at idle) without the vacuum line attached to it (Pressure changes when you apply vacuum.)
If you're cruising speed / RPM is over 3800, those secondaries will come alive and since they are 720's you will go considerably richer than when you had 550's.
Make sure you have a fuel pump, and also make sure that you set the regulator pressure (at idle) without the vacuum line attached to it (Pressure changes when you apply vacuum.)
#6
F**K THE SYSTEM!!
Thread Starter
I do have a walbro 255. The only way im controlling fuel is through the FPR.
ANd no i dont have emmisions.
But if boostlee is correct about it staying near the 14.0 afr area in idle and any condition "not in boost" than there is nothing wrong with my car.
I just found it crazy for it to be so lean when im baby driving. I guess it'll get good gas mileage=D
ANd no i dont have emmisions.
But if boostlee is correct about it staying near the 14.0 afr area in idle and any condition "not in boost" than there is nothing wrong with my car.
I just found it crazy for it to be so lean when im baby driving. I guess it'll get good gas mileage=D
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#12
Lives on the Forum
Everything sounds reasonable.
This is a good example of when people freak out cause they don't know what they are doing.
Please do your research before getting paranoid on what is bad and what is okay...
-Ted
This is a good example of when people freak out cause they don't know what they are doing.
Please do your research before getting paranoid on what is bad and what is okay...
-Ted
#13
F**K THE SYSTEM!!
Thread Starter
No not from Nor Cal.
Yup only running 7-8 psi because i cant tune timing.
I have the fuel to go 14 psi becaus I tried it already and it stays rich... (pulls like a ****)
But I'm leaving it at 7-8 till i get an EMS.
Yup only running 7-8 psi because i cant tune timing.
I have the fuel to go 14 psi becaus I tried it already and it stays rich... (pulls like a ****)
But I'm leaving it at 7-8 till i get an EMS.
#15
destroy, rebuild, repeat
iTrader: (1)
i have an rtek 2.0 and tried to tune it out, but to no avail. it will only make the 13 afr area leaner, and it starts to stumble. still get 10/11's at extremely low throttle either way
#17
Engine, Not Motor
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Join Date: Feb 2001
Location: London, Ontario, Canada
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Typical behaviour of the stock ECU.
I believe (but could be wrong) that it is related to how the ACV is supposed to operate under decel. Combustion is supposed to continue in the exhaust manifold to aid in cat operation.
I believe (but could be wrong) that it is related to how the ACV is supposed to operate under decel. Combustion is supposed to continue in the exhaust manifold to aid in cat operation.
#18
HAILERS
Join Date: May 2001
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I still think it's the ECU acting like an accelerator pump(like on a carb car), so you don't go lean when you reapply throttle after letting off. In other words keeping it from hesitating each time you let off the pedal then reapply the pedal.
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