Why am i not getting good MPG?

[Longshot270]

F150 Man 4Eva, if you want to try what tatsch said you can go in and adjust your 4th gear shift and lock points. Raising them will usually hurt your mileage and lowering them will do the same on performance until you get the RPMs back up, but every truck is different.

[F150 Man 4Eva]

Naa, I don't really want to go in and fool with anything right now. It isn't like it's a problem..just something to get used to I guess. My AVG on Gryphon says 13.6 right now and trucks comp. says 12.6. I am gonna give it some more time and see what happens. But I do tend to keep my eye on that INST ECON. and it isn't pretty. Oh well I guess. Let me ask this though. Does the drone sound indicate running lean or can they exist seperatly? I definitely want my truck running like it should, but at the same time...if taking away the loud sound is hurting my MPG...I would say bring the drone back. It never really bothered me anyway..I kindof like hearing the power when I hit the gas. But is that drone only there because the truck is running lean and/or not as it should?

[Longshot270]

Originally Posted by F150 Man 4Eva

Naa, I don't really want to go in and fool with anything right now. It isn't like it's a problem..just something to get used to I guess. My AVG on Gryphon says 13.6 right now and trucks comp. says 12.6. I am gonna give it some more time and see what happens. But I do tend to keep my eye on that INST ECON. and it isn't pretty. Oh well I guess. Let me ask this though. Does the drone sound indicate running lean or can they exist seperatly? I definitely want my truck running like it should, but at the same time...if taking away the loud sound is hurting my MPG...I would say bring the drone back. It never really bothered me anyway..I kindof like hearing the power when I hit the gas. But is that drone only there because the truck is running lean and/or not as it should?

The drone is only a harmonic vibration, like blowing across the top of a bottle. The big thing on the side of the stock intake is a resonator that takes that sound out for that particular setup. The reason Bill tunes out the drone is because after a while people get tired of it and then ask him to take it out.

[88Racing]

Originally Posted by longshot270

The drone is only a harmonic vibration, like blowing across the top of a bottle. The big thing on the side of the stock intake is a resonator that takes that sound out for that particular setup. The reason Bill tunes out the drone is because after a while people get tired of it and then ask him to take it out.

On the stock intake those chambers are called hem-holz silencers.
For give me if I spelled the name wrong but I'm close.

[Longshot270]

Originally Posted by 88Racing

On the stock intake those chambers are called hem-holz silencers.
For give me if I spelled the name wrong but I'm close.

I was going to say the name too but I couldn't remember how to spell it either.

[Jackpine]

Originally Posted by longshot270

I was going to say the name too but I couldn't remember how to spell it either.

Helmholtz! Sheesh!

Here's a Wikipedia article on it: Helmholtz resonance - Wikipedia, the free encyclopedia

Note near the bottom it talks about reducing drag on aircraft bu 40% using acoustic liners based on the Helmholtz principle. This effect was something I was a bit concerned about when people talked about removing the resonators from intakes. I thought it might induce standing waves in the intake that would hurt its efficiency. I think that is why "drone" is probably NOT a good thing too.

- Jack

[88Racing]

Thanks Jack!

I was close but no cigar!!!!!!

[Longshot270]

Originally Posted by JackandJanet

Helmholtz! Sheesh!

Here's a Wikipedia article on it: Helmholtz resonance - Wikipedia, the free encyclopedia

Note near the bottom it talks about reducing drag on aircraft bu 40% using acoustic liners based on the Helmholtz principle. This effect was something I was a bit concerned about when people talked about removing the resonators from intakes. I thought it might induce standing waves in the intake that would hurt its efficiency. I think that is why "drone" is probably NOT a good thing too.
- Jack

Same here, its just not easy to prove when people think that cutting it off will make the intake more streamline like the aftermarket CAIs.