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Reply With QuoteIt should go lean between shifts, since when your foot is off the gas, the injectors shut off.
This is a discussion on afr question within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; Hello, just a quick question on afr. On normal shifting why does afr dip briefly rich ( 11.6) or so ...
Hello, just a quick question on afr. On normal shifting why does afr dip briefly rich ( 11.6) or so between shifts? Thank you.
It should go lean between shifts, since when your foot is off the gas, the injectors shut off.
2005 WRX STi (Mods | Virtual Dyno)
Resident Tuner @ WTF Tuning, LLC
"Never trust anything that bleeds for a week and lives ..."
UNYSOC
Ever notice how if you're boosting though, in between shifts your rpm gauge raises even though your foot isn't on the gas?
Yeah - a bit annoying at first but it ends up helping keep the revs up. I believe it is for emissions purposes.Originally Posted by nsibanez
I'm honestly not sure if that results in a rich spot.
A vent to atmosphere BPV will for sure though.
"From a little spark may burst a mighty flame." - Dante
"The stitch is lost unless the thread is knotted." - Italian proverb
Same thing as a BOV?
That's kind of what I was thinking when the rpm jumping a tad at the shift. The afr dips only for a split second and then goes to where it should be. Just wondering why if anyone knows.
11 wrx, cai, tbe, ebcs, TP stage 2 custom tune.
Yup.
"From a little spark may burst a mighty flame." - Dante
"The stitch is lost unless the thread is knotted." - Italian proverb
its called shift flare, its not because of emissions. I have noticed it is worst if you are running extremely rich and happens a lot more in the low to mid rpms.
Noticed a good 1-2 mpg average drop with it, so I took it off.
Plus in 4th, letting off the gas at around 2500-3000 rpm range I always heard a high pitched squeek. Figured that could have been the problem, haven't noticed it since I took it off either....turbo flutter by chance?
Yeah, if it wasn't blowing off enough it would surge the compressor for sure.
"From a little spark may burst a mighty flame." - Dante
"The stitch is lost unless the thread is knotted." - Italian proverb
I don't think it's anything serious. I guess they're adjustable, but I don;t know how to do that...so I think I'm going to sell it soon. Nothing wring with it...bought it off a coworker with an 11, and only was used for about 2000 miles. Same with me. I just removed it to troubleshoot the noies, and just don't care about putting it back on.
Yeah a recirculating one that is adjusted correctly is the only way to go if you aren't happy with stock. I never messed with mine but have heard the newer models are a bit weak if you are going much beyond stage II.
"From a little spark may burst a mighty flame." - Dante
"The stitch is lost unless the thread is knotted." - Italian proverb
What valve?
2005 WRX STi (Mods | Virtual Dyno)
Resident Tuner @ WTF Tuning, LLC
"Never trust anything that bleeds for a week and lives ..."
UNYSOC
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