Intake Questions

[cody994x4]

bill has just provided a plethora of helpful info. looks like ill b spending sometime researching and educating myself on this subject.

but thanks for the cut & dry answer shotgun...looks like ill be dng the gotts afterall.
thanks guys

[Longshot270]

That was a great article!

I also did the math not too long ago (Bill probably remembers me asking him what g/s means, I knew that info would be handy ) and for a custom ram air on my truck to actually do more than fill the small amount of vacuum I would have to be travelling at least 95 mph with practically no engine load and low rpms, a feat that simply isn't possible in our trucks. Plus it would only be about 1% increase under the before mentioned conditions and at 100% efficiency from outside to the cylinder.

[Jackpine]

And, the resonant frequencies in the intake system were something I was worried about in the Gott's Mod type conversion too. (I was thinking more along the line of standing waves, but it's the same idea).

I have no "test data" to back up any performance gain claim whatsoever, but, as far as I can tell, I'm getting the same fuel economy figures at an average speed of 70-75 mph now as I used to get at 55-60 mph before the Gotts mod. Before I did that mod, my fuel economy at the higher speed was lower.

Very interesting article, Bill. Thanks for posting it.

- Jack

[cody994x4]

i guess this would apply to hoods also. although they take in more air than a hood w no induction they fail to create more pressure, not to mention delivering it into the throttle body/intake manifold at 100% efficiency.

now i want a turbo, lol.

i was looking to reduce IAT's but it looks like that is nothing to worry about either, 95% of my driving is highway.

i plan on recording my MAF flow in g/s at a given speed say 65 or 70mph. after i complete the gotts mod i will re-test and see just how much more air im getting then before.
i wonder if anyone has done a gotts type mod to a turbo equipped engine. just to get the turbo to spool up faster. hmmm

[Longshot270]

Originally Posted by cody994x4

i guess this would apply to hoods also. although they take in more air than a hood w no induction they fail to create more pressure, not to mention delivering it into the throttle body/intake manifold at 100% efficiency.

now i want a turbo, lol.

i was looking to reduce IAT's but it looks like that is nothing to worry about either, 95% of my driving is highway.

i plan on recording my MAF flow in g/s at a given speed say 65 or 70mph. after i complete the gotts mod i will re-test and see just how much more air im getting then before.
i wonder if anyone has done a gotts type mod to a turbo equipped engine. just to get the turbo to spool up faster. hmmm

All the gotts mod does is help reduce the amount of vacuum caused at higher RPMs. If you were to rev the truck with your hand on the air filter or near the opening you would definitely feel it get stuck to it until the RPMs went back down. It probably would help a turbo spool up a little faster though. But many of the turbo setups I've seen have a regular pipe leading up to a CAI type filter. Unless the intake has a restrictive snorkel like the stock trucks there probably wont be much of a difference.

[cody994x4]

i had no idea there was so much more to intakes than i knew before,i guess it reflects 'marketing'...... im glad i didnt buy one.

ill b doing the gotts and a k&n filter, this thread made me curious abt lightnings though, i wonder if they have the same stock opening at the fender well, for the supercharger on these 5.4s

[Longshot270]

Originally Posted by cody994x4

i had no idea there was so much more to intakes than i knew before,i guess it reflects 'marketing'...... im glad i didnt buy one.

ill b doing the gotts and a k&n filter, this thread made me curious abt lightnings though, i wonder if they have the same stock opening at the fender well, for the supercharger on these 5.4s

That is a good question. I know that some of the aftermarket S/Cs use a CAI style filter at the end of the intake pipe but I've never looked under the hood of a stock S/C F150. As long as you leave the intake sensors and their surrounding housings alone, you can do whatever you want to the intake.

[Power Hungry]

Originally Posted by cody994x4

i guess this would apply to hoods also. although they take in more air than a hood w no induction they fail to create more pressure, not to mention delivering it into the throttle body/intake manifold at 100% efficiency.

One thing I read is that when the vehicle is travelling, the body creates an airfoil around it and that the pressurized airflow is actually about 2-3 inches above the hoodline. This means that your hood scoop would need to be at least 3 inches or higher to have ANY effect. Otherwise, you are actually operating in a vacuum.

Fun stuff, ain't it?

[Longshot270]

Even if they are considered ineffective I still wouldn't mind having one.

[Jackpine]

Originally Posted by Power Hungry

One thing I read is that when the vehicle is travelling, the body creates an airfoil around it and that the pressurized airflow is actually about 2-3 inches above the hoodline. This means that your hood scoop would need to be at least 3 inches or higher to have ANY effect. Otherwise, you are actually operating in a vacuum.

Fun stuff, ain't it?

The pitot tube opening, that picks up ram air pressure for aircraft speed is positioned quite a bit away from any part of the fuselage or wing for that very reason.

Much of what we'd "guess" in aerodynamics is just plain wrong!

- Jack