how to get rid of extra fuel coming off throttle?
#1
how to get rid of extra fuel coming off throttle?
I have an issue coming off the throttle where I see the wideband read out down to the 10 AFR's
I'm wondering if this an issue with the VE table or more likely the injectors being held open to long compared to how fast the engine is reacting
Here is a view of what I'm talking about
I will throw up a log and a MSQ as well
overrun is setup to come on 2 seconds after it meets the requirements
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I'm wondering if this an issue with the VE table or more likely the injectors being held open to long compared to how fast the engine is reacting
Here is a view of what I'm talking about
I will throw up a log and a MSQ as well
overrun is setup to come on 2 seconds after it meets the requirements
Uploaded with ImageShack.us
#3
Boost Czar
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Join Date: May 2005
Location: Chantilly, VA
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honestly, your PW drops as your vacuum increases, so much so that the AFRs eventually go really lean before overrun even kicks on.
You can see where overrun kicked on where the PW spiked down to 0 for a split second, that's the only time you weren't injecting fuel.
You can see where overrun kicked on where the PW spiked down to 0 for a split second, that's the only time you weren't injecting fuel.
#5
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,729
Total Cats: 4,126
you lifted
the pulse width is at 1.3ms. im sure you idle higher than that. you could try removing more fuel in the map on your 25 and 13kPa rows and see if that helps. but also at the saem respect, the AFR jump way past 15.0:1 before you even cut the fuel completely at the same PW and MAP. So you have some unburned fuel leftover when you close the throttle, the AFR meters it...nothing you can really do about it.
the pulse width is at 1.3ms. im sure you idle higher than that. you could try removing more fuel in the map on your 25 and 13kPa rows and see if that helps. but also at the saem respect, the AFR jump way past 15.0:1 before you even cut the fuel completely at the same PW and MAP. So you have some unburned fuel leftover when you close the throttle, the AFR meters it...nothing you can really do about it.
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