air/fuel ratio on initial boost?
Sep 7, 2009, 07:55 PM
#1
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air/fuel ratio on initial boost?
I finally have my AEM wideband set up to datalog on PCMscan woohoo! Well i did a few pulls today and found something that i am not sure is normal or not so if any tuners can chime in i would greatly appreciate it! As soon as i hit full boost for the first half second to full second i am showing still around 14:1 ratio then it drops quickly to 11.4 - 11.8 and holds that through the pull. Should i be showing a more rich ratio as soon as it hits boost? Is the guage reading slow? or do i need to adjust my tune before i melt a piston?
Each vertical bar in the background graph represents one second.
Each vertical bar in the background graph represents one second.
Sep 8, 2009, 12:28 AM
#2
1) use a proper program like evoscan
2) is that holding 23 psi FLAT??? doesn't seem right
There will be a little lag in lower RPM (as the airflow is low, so there is a SLIGHT delay between combustion and when the AFR gets read. HOWEVER from this graph you are way to lean, you can run 12.5 AFR up until about 10psi then you need to drop to ~11AFR pretty damn quick (like b4 20psi)
2) is that holding 23 psi FLAT??? doesn't seem right
There will be a little lag in lower RPM (as the airflow is low, so there is a SLIGHT delay between combustion and when the AFR gets read. HOWEVER from this graph you are way to lean, you can run 12.5 AFR up until about 10psi then you need to drop to ~11AFR pretty damn quick (like b4 20psi)
Sep 8, 2009, 06:20 PM
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1) use a proper program like evoscan
2) is that holding 23 psi FLAT??? doesn't seem right
There will be a little lag in lower RPM (as the airflow is low, so there is a SLIGHT delay between combustion and when the AFR gets read. HOWEVER from this graph you are way to lean, you can run 12.5 AFR up until about 10psi then you need to drop to ~11AFR pretty damn quick (like b4 20psi)
2) is that holding 23 psi FLAT??? doesn't seem right
There will be a little lag in lower RPM (as the airflow is low, so there is a SLIGHT delay between combustion and when the AFR gets read. HOWEVER from this graph you are way to lean, you can run 12.5 AFR up until about 10psi then you need to drop to ~11AFR pretty damn quick (like b4 20psi)
hehee
Sep 8, 2009, 07:14 PM
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Sep 8, 2009, 08:12 PM
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Sep 8, 2009, 09:14 PM
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Also the instructions say to go the misc. options and change the The 1st entry value from 0x05 to 0x23. The 2nd entry change the value from 0x05 to 0x23. The 3rd entry change the value from 0x42 to 0x52, but mine already says this after i changed the XML. I have not edited any of these and this is how they appear after only pasting the data into the XML.
Last but not least
It seems i have a new XML file that says _MODS.XML ?? Pretty much blank inside the folder too. Strange! Let me know if this all looks right 
Last edited by Ray Knight; Sep 8, 2009 at 09:18 PM.
Sep 8, 2009, 09:29 PM
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Sep 8, 2009, 09:35 PM
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