Blown 91 Bird
Registered User
just curious but how lean (or rich) are our cars with stock motors and a stock tune across the board? I know all will be different being at different altitudes and different air temps... but do they generally run rich or lean?
I saw a dyno sheet for someone on here and the A/F curve looked as if it were somewhat rich throughout the lower RPM range, but got crazy lean (14:1+) near redline. Not sure if this was a stock motor with a stock tune or not though.
Im asking cause ive been thinking about putting a nitrous kit on my car (wet), and will setup the jetting to be on the rich side (and just play with bottle pressure to lean it out when wanted) if these things tend to run lean. I know i could just find out by putting it on a dyno and using a wideband o2, but from my experiences my cars have always ran leaner on the street then they did on the dyno since the loads are different (which is why i will not tune any of my cars on the dyno). So other then going by what an o2 sniffer has to say on a dyno, the only other choice would be to stick a set of fresh plugs in it and make a pass on my test road and pull over and pull a couple plugs out to see what they look like (which is what ill most likely do).
I saw a dyno sheet for someone on here and the A/F curve looked as if it were somewhat rich throughout the lower RPM range, but got crazy lean (14:1+) near redline. Not sure if this was a stock motor with a stock tune or not though.
Im asking cause ive been thinking about putting a nitrous kit on my car (wet), and will setup the jetting to be on the rich side (and just play with bottle pressure to lean it out when wanted) if these things tend to run lean. I know i could just find out by putting it on a dyno and using a wideband o2, but from my experiences my cars have always ran leaner on the street then they did on the dyno since the loads are different (which is why i will not tune any of my cars on the dyno). So other then going by what an o2 sniffer has to say on a dyno, the only other choice would be to stick a set of fresh plugs in it and make a pass on my test road and pull over and pull a couple plugs out to see what they look like (which is what ill most likely do).