Afe Stage 2 Intake Concerns
03-21-2013, 06:42 PM
#1
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Afe Stage 2 Intake Concerns
Alright so I have done lots of searching around on the forums and I have read that this intake runs best with a custom tune. Now I bought it from a dealer here that has run it on his truck 2012 5.0L for a year now with zero issues. My concern is without the tune is it going to lean the truck out and cause a lose in power, or will after 50 km the computer will adjust for the air flow and work just fine? I know with a tune it will run a lot better as does anything with a custom tune it seems like.
Truck has 4000km on it so thats why I'm leaning towards waiting for a tune as the warrenty is still fresh. Really just wanna know if running this intake system will have any ill effects on performance without the tune. I'm hopeing for a bit better throttle response as well with it. Gas mileage is going to be small at best I know that. Thanks again.
Truck has 4000km on it so thats why I'm leaning towards waiting for a tune as the warrenty is still fresh. Really just wanna know if running this intake system will have any ill effects on performance without the tune. I'm hopeing for a bit better throttle response as well with it. Gas mileage is going to be small at best I know that. Thanks again.
03-21-2013, 07:14 PM
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Yah the more airflow isn't enough too cause the stock computer too run lean hey? Just don't wanna put this on my truck and have it hurt the performance at all.
Anyone actually running this intake without a custom tune right now in the 2013 5.0?
Anyone actually running this intake without a custom tune right now in the 2013 5.0?
03-21-2013, 10:06 PM
#6
Wouldn't worry about it. I had my 5.0 dyno tuned after installing the Boss intake manifold but before I installed the aFe intake. We datalogged and compared fuel trim from before and after and the CAI made very little difference.
As long as the motor is running closed loop, it should be able to adjust to any change in airflow instantaneously (within limits of the injectors to keep up). It's only when it goes open loop at WOT that there's a potential problem, but we found the stock fuel maps are quite conservative and resulted in a rich mixture (about 12:1) so that should be safe too.
As long as the motor is running closed loop, it should be able to adjust to any change in airflow instantaneously (within limits of the injectors to keep up). It's only when it goes open loop at WOT that there's a potential problem, but we found the stock fuel maps are quite conservative and resulted in a rich mixture (about 12:1) so that should be safe too.
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03-21-2013, 10:27 PM
#8
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It means you'll be fine. Intake will not add enough air to make the engine run lean by itself. If you had headers and exhaust in conjunction with the intake I would get it dyno tuned.
03-21-2013, 10:54 PM
#10
WOT = Wide Open Throttle.
Most of the time the engine runs with a feedback loop - air sensor in the intake measures the mass of incoming air, computer calculates how much fuel to add, O2 sensors in the exhaust check if the mixture was too rich or lean, and the result is used to modify fuel metering (fuel trim) - closed loop.
But at WOT the computer switches over to a look-up table (aka fuel maps) to figure out how much fuel is needed based on how much air it thinks is entering, no feedback. So if the air sensor isn't reading accurately (because the intake diameter is bigger, for instance) the mixture could go lean, which would be bad. Very bad...
Fortunately, it turns out that the air flow with a CAI isn't that different from stock. Well within the range that closed loop feedback can compensate for. And when in open loop, the default fuel metering is quite generous, so again little chance of going lean.
You might still want a tune in order to get the best efficiency and power out of a CAI, but there's little chance of disaster from just a CAI without a tune.
Most of the time the engine runs with a feedback loop - air sensor in the intake measures the mass of incoming air, computer calculates how much fuel to add, O2 sensors in the exhaust check if the mixture was too rich or lean, and the result is used to modify fuel metering (fuel trim) - closed loop.
But at WOT the computer switches over to a look-up table (aka fuel maps) to figure out how much fuel is needed based on how much air it thinks is entering, no feedback. So if the air sensor isn't reading accurately (because the intake diameter is bigger, for instance) the mixture could go lean, which would be bad. Very bad...
Fortunately, it turns out that the air flow with a CAI isn't that different from stock. Well within the range that closed loop feedback can compensate for. And when in open loop, the default fuel metering is quite generous, so again little chance of going lean.
You might still want a tune in order to get the best efficiency and power out of a CAI, but there's little chance of disaster from just a CAI without a tune.
