Lean Air/Fuel Ratio

[ttshark]

QUOTE (eastside6 @ Oct 14 2009, 05:47 AM)

i have a copy of my dyno at home, so i wont be able to post it. But with injen CAI and magnaflow cat-back i posted a 137hp i cant remember the torque, i wanna say it was around 130ish. This is in a '03 6i ATX.

on a side note, i also had the A/F tested and it seemed to be pretty lean, like around 15-16:1. Just something to think about[/b]

This is a quote from the dyno thread in this section. I am just curious. Would this mean that basically anyone running a CAI is potentially making the car more lean. I mean it makes sense in my head but if that is the case, in the long run would it not wear the engine faster?

Advanced timing in addition to this would then make it worse?

For the first time I am truly appreciating the need to tune my car.

[MrTea]

where's the link to the dyno...need to see at what point those levels were hit. if it was at 15.0 with a sniffer sitting in 1 pipe of a split exhaust....ehh, really depends on the whole graph, not 1 number.

[ttshark]

He has not provided the graph yet. I am just wondering if 'generally' being lean should be expected with intake modifications.

I would imagine our EMS is smart enough to compensate, however I put preservation of my engine over optimism

ps. is your car up and running yet?

[MrTea]

they car always runs....it just doesn't drive, if that helps.

an intake will almost always lean out the A/F, which is how it makes power. if you go in to tune the car, they typically will be pulling more fuel across the map that they will be adding any...that's where much of the power comes from outside of timing.