tuning AFR question
#1
Burning Brakes
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Join Date: Oct 2005
Location: Montreal, Quebec + Ottawa, Ontario
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Hi,
I've been tuning my AFR lately and have some questions. I am running 1 bar of boost and get a constant 11.8:1 at WOT up to redline. From previous discussions, I have read reccomendations for slightly leaner or richer AFR target conditions. My question is what is the difference in spoolup and hp/tq values for say an AFR or either 11:1 or 12.5:1 at the same engine speed/boost. Would it be desirable to tune richer or leaner while boost builds for improved spoolup? Thanks in advance!
-Nick
I've been tuning my AFR lately and have some questions. I am running 1 bar of boost and get a constant 11.8:1 at WOT up to redline. From previous discussions, I have read reccomendations for slightly leaner or richer AFR target conditions. My question is what is the difference in spoolup and hp/tq values for say an AFR or either 11:1 or 12.5:1 at the same engine speed/boost. Would it be desirable to tune richer or leaner while boost builds for improved spoolup? Thanks in advance!
-Nick
#2
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12.5:1 will give you more power; it's actually the right air/fuel for power.
Most here will run into the mid-high elevens because of the added safety gained with a barely noticeably drop in power. Low elevens you will notice the power drop a bit.
For spool-up that would be pre max power; therefore you can be leaner (even leaner than 12.5), only for that short time before you hit higher boost levels. I think leaner generally gives hotter exhaust and heat helps to spin the turbine.
Most here will run into the mid-high elevens because of the added safety gained with a barely noticeably drop in power. Low elevens you will notice the power drop a bit.
For spool-up that would be pre max power; therefore you can be leaner (even leaner than 12.5), only for that short time before you hit higher boost levels. I think leaner generally gives hotter exhaust and heat helps to spin the turbine.