Cruise AFR around 10-11, ideas?
Jul 27, 2011, 03:36 PM
#1
Cruise AFR around 10-11, ideas?
I upgraded from a megan o2 housing, stock ic, stock inlet pipe, stock bov, evo 8 turbo w/ 10.5 hotside.
to an
invidia 02 housing, ets ic and piping, vta tial bov, FP inlet and evo 9 turbo with FP inlet housing.
My afrs at cruise stay around 10-11. WOT afrs are spot on. No leaks. No CELs.
to an
invidia 02 housing, ets ic and piping, vta tial bov, FP inlet and evo 9 turbo with FP inlet housing.
My afrs at cruise stay around 10-11. WOT afrs are spot on. No leaks. No CELs.
Jul 30, 2011, 04:20 PM
#3
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If you're still on MAF then your bov is opening under cruising conditions, bleeding off air that has been accounted for by the maf, causing it to run rich. At WOT the pressure causes the bov to shut and run fine!
Jul 30, 2011, 04:24 PM
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Get a heavier spring for your tial. Great write-up by the TiAL rep http://highboostforum.com/forum/show...OV-information
Aug 1, 2011, 04:39 PM
#6
Yes, I'm still on MAF and do have a heavier spring. I have a new Tial Q valve. I'm reading about -11.8 psi at idle. I had a -10 psi spring in there, but went with a heavier one that I don't know what the rating is. Tial does not make one for vacuums lower than -11.
Also, AFRs at idle when the car is cold are on target. Once the car is up to temp the afrs are off at idle. I don't have any stumbling, rough idling or stalling while driving. The car is very smooth.
Also, AFRs at idle when the car is cold are on target. Once the car is up to temp the afrs are off at idle. I don't have any stumbling, rough idling or stalling while driving. The car is very smooth.
Last edited by mithrandir7533; Aug 1, 2011 at 04:44 PM.
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Aug 1, 2011, 07:24 PM
#9
yeah, my tuner seems to think it's the front o2 sensor. Is there a way to check if its bad besides the obvious?
It's -11.8 psi vacuum, not inches of mercury. Yes, the car runs smooth. No surging, flutter etc. Power comes on nicely. Around 3500 RPMs I'm spiking to 23 lbs. If it wasn't for my wideband and the poor gas mileage I would say there was nothing wrong with the car.
I think the spring color is red, but that doesn't matter because it's not one made by tial. It's stiffer than the -10 psi one I had in there originally from tial. That one caused driveability issues. AFRs were off then as well.
It's -11.8 psi vacuum, not inches of mercury. Yes, the car runs smooth. No surging, flutter etc. Power comes on nicely. Around 3500 RPMs I'm spiking to 23 lbs. If it wasn't for my wideband and the poor gas mileage I would say there was nothing wrong with the car.
I think the spring color is red, but that doesn't matter because it's not one made by tial. It's stiffer than the -10 psi one I had in there originally from tial. That one caused driveability issues. AFRs were off then as well.
Last edited by mithrandir7533; Aug 1, 2011 at 07:30 PM.
Aug 2, 2011, 08:03 AM
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Its either a bad front 02 sensor or the Tial Q with the stock maf. Is your service engine soon light on? I had the same cruising a/f ratio when I tried out the Tial Q with stock maf. Since then I switched back to a Synapse DV recirculated, cruising a/f is perfect. FYI, Synapse sells an adapter flange so you can use their DV with a Tial UICP flange, v-band clamp, o-ring, etc.