exhaust size?

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Oct 30, 2013 | 11:29 AM

#16

JOHN2001

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Joined: Dec 2010

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From: Temperance, MI

Take the muffler off go for a wot run with the passenger window down and tell me you're not happier. I personally hate the sound of my truck crusing down the road or sitting at an idle, it annoys the snot out of me! BUT.... Under wot there is no sweeter sound that can hit my ears and make me grin so I deal with the part I hate because at 32 psi of boost the exhaust is the sweetest thing ever.

Oct 30, 2013 | 11:55 AM

#17

Krochus

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Joined: Sep 2006

Posts: 798

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From: Alma Arkansas

In straight piped on stock exhaust on a 6673 and mines not loud ( relatively speaking) at all. The engine noise from under the hood is still far and away the dominate noise.

But it does sound pretty sweet passanger side window down at part throttle under a load.

Oct 30, 2013 | 04:45 PM

#18

Tugly

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Joined: Jan 2011

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From: Puget Sound

Straight-piped stock and the engine is louder? You have something going on under the hood... like an exhaust leak or maybe in need of fuel additive or better oil.

Oct 30, 2013 | 05:25 PM

#19

Krochus

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Joined: Sep 2006

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From: Alma Arkansas

Quote:

Originally Posted by Tugly

Straight-piped stock and the engine is louder? You have something going on under the hood... like an exhaust leak or maybe in need of fuel additive or better oil.

Low mileage stripper model (not much sound insulation) so yeah the engine is loud as ****. A 100-1 shot of 2stroke oil does knock back the higher pitched injector noise a slightly noticeable amount. But my exhaust isn't nearly as loud as you'd expect.

No codes
Great power
20+ mpg every time
No smoke in the <100hp tunes

If you're standing towards the passangers side rear then yeah the exhaust is loud.

From the drivers seat it's all under hood without the window down.

Oct 30, 2013 | 05:29 PM

#20

Krochus

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Joined: Sep 2006

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From: Alma Arkansas

Throw in a healthy dose of zf6 gear rollover noise and a HD ceramic clutch hub and the exhaust has a LOT of competition in the noise DPT

Oct 31, 2013 | 07:23 AM

#21

Tugly

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Joined: Jan 2011

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From: Puget Sound

Quote:

Originally Posted by Krochus

Low mileage stripper model (not much sound insulation).

20+ mpg every time
No smoke in the <100hp tunes

From the drivers seat it's all under hood without the window down.

Uuhhh.... I know from experience a stripped-down truck with a clutch can eek out 20 MPG on long highway runs, but non-highway driving kills that and tunes always make a bigger liar out of an overhead (assuming you have one). Is that economy hand-calculated?

The 6637 makes a ton of noise, so that could be one of your biggest sinners. I have the Lariat trim, so the cab noise is really subdued... putting me in a position where it's hard for me to compare our two trucks.

You are a prime candidate for pulling the interior out and installing sound-deadening matting.

Oct 31, 2013 | 09:21 AM

#22

Krochus

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Joined: Sep 2006

Posts: 798

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From: Alma Arkansas

Quote:

Originally Posted by Tugly

Uuhhh.... I know from experience a stripped-down truck with a clutch can eek out 20 MPG on long highway runs, but non-highway driving kills that and tunes always make a bigger liar out of an overhead (assuming you have one). Is that economy hand-calculated? The 6637 makes a ton of noise, so that could be one of your biggest sinners. I have the Lariat trim, so the cab noise is really subdued... putting me in a position where it's hard for me to compare our two trucks. You are a prime candidate for pulling the interior out and installing sound-deadening matting.

Hand calculated every single week on the same pump. I don't even have door cubby pockets and my seat is grey vinyl ..you really think I have an overhead trip computer?

Here's a bunch of my most recent fill calculations. The low numbers are towing my pontoon boat.

F250 mpg
21.9
18.6
19.7
19.6
14.3 lake tenkiller 70mph
21.8
20.3 now tuned
21.3
22.6
17.9
21.5
21.1
19.9
19.5
20.6
20.3

These trucks will get great mpg if you resist the urge to get a 4x4 auto and then turn it into a brodozer

Oct 31, 2013 | 09:30 AM

#23

Krochus

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Joined: Sep 2006

Posts: 798

Likes: 1

From: Alma Arkansas

Now I do seldom run the speed limit on my commute because of construction and the time. Usually I'm rolling along at 60 or so at just shy of 2k rpm.

If I hold a gear at 1500 or above at lower speeds you start to hear the exhaust some. But in top gear at hwy speeds you mostly just hear the motor and copious road noise