Superformance Cold Air Intake Design

[Ace23]

Originally Posted by eschaider

When you experience a significant tick up or down in humidity, air temp and possibly also barometer, carbs will show a significant change in engine performance because they have a more difficult time correcting the fuel delivery in these situations. A MAF (mass air flow) based EFI system will do a much better job of correcting fuel delivery. The sluggishness you feel is caused by a decrease in air density and an increase in humidity both of which displace oxygen in the air making the engine run rich.

A MAF-based EFI system will measure the actual air mass injested by the engine and correct the fuel delivery to exactly match what the engine needs. You will immediately feel the difference in throttle response and the vehicle acceleration your seat of the pants dyno reports. Your Cobra will be able to accommodate these climatic changes as easily as your daily driver does.

I agree. Using an in-tank fuel pump and a nice multi-port injection system would likely be a world of difference.

[eschaider]

Originally Posted by Ace23

I agree. Using an in-tank fuel pump and a nice multi-port injection system would likely be a world of difference.

Not just a multi-port EFI but a Mass Air Flow (MAF) based multi-port EFI. A Speed Density EFI system will be a significant improvement over carbs, from a tunability perspective; however, significant changes in air temp, barometer, humidity etc., are extremely difficult to accommodate with a Speed Density fueling model. As a result, without a new tune, you still experience the power reduction we all so dislike.

The MAF-based EFI fueling model measures the mass of air entering the engine, making AFR determinations and fueling adjustments in real-time, no matter the atmospheric conditions. Remember, AFR is lbs of air per pound of fuel.

This doesn't sound like a big deal until you spend your dollars on your favorite multi-port Speed Density EFI system and discover not much has changed from your carburetted experiences, except the amount of money that is now in your pocket.