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post #1 of 17 Old 12-11-2012, 03:46 PM Thread Starter
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Quiet 6.7

Just a general discussion question about the sound of the 6.7L. I really liked the stock sound of the 6.7 and was afraid I would ruin the harmony of the stock exhaust, etc. Even fully deleted with a straight pipe all the way back it still sounds pretty refined and I like the swooshing sound. So, other than the turbo running interference in the exhaust, what makes it so quiet?

Jim

Tuxedo Black 2011 F250 Lariat FX4

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Originally Posted by stan60 View Post
Probably one of those deals that you ask 10 guys and get 10 different answers. I'm keeping what I have. I like the look, I like the sound. I don't think you would ever notice the difference on the street. Maybe on the dyno, but I don't ride there.
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post #2 of 17 Old 12-11-2012, 06:17 PM
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Just finished my truck today. I love it. Sounds like a REAL DIESEL now!

Turbo's do a good job to quiet/filter the sound.

I have a '07 Porsche Turbo. I removed the stock exhaust & installed a Tubi Race Exhaust with NO CATS. And it's not that loud as one may think. WOT it's a animal but being twin turbo it's very refined. Taking CATS off a Mustang OR Vette, now that's a different story...


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post #3 of 17 Old 12-11-2012, 06:22 PM
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Quote:
Originally Posted by Balla6.7 View Post
Just finished my truck today. I love it. Sounds like a REAL DIESEL now!

Turbo's do a good job to quiet/filter the sound.

I have a '07 Porsche Turbo. I removed the stock exhaust & installed a Tubi Race Exhaust with NO CATS. And it's not that loud as one may think. WOT it's a animal but being twin turbo it's very refined. Taking CATS off a Mustang OR Vette, now that's a different story...
when you say real diesel, what does it sound like.. closer to a 6.0L or 7.3L? cause thats what i miss in the 6.7

2007 Ford F250 Lariat 6.0 Powerstroke

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post #4 of 17 Old 12-11-2012, 06:37 PM
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Originally Posted by kendallcschm View Post
when you say real diesel, what does it sound like.. closer to a 6.0L or 7.3L? cause thats what i miss in the 6.7
Funny you say that. It sounds different at every RPM Range.

Idle = Cummins
Above Idle-1,200= 6.0L (Turbo Whistle)
1,200-2,000= 6.7L (Mixture of everything)
2,200+= Chevy V8 Gasser/5.0Mustang

That's my Best discreption...Others can chime in and add.

5" Flo-Pro w/Muffler.


'11 F350 6.7L FX4,
H&S Tuned & Deleted!
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post #5 of 17 Old 12-11-2012, 06:38 PM
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The 6.7 has new direct injection technology which injects diesel multiple times during a single combustion cycle to reduce the diesel "rattle"

Turbo Joe
2012 F250 CC XLT 4x4
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post #6 of 17 Old 12-11-2012, 06:45 PM
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Quote:
Originally Posted by Balla6.7 View Post
Funny you say that. It sounds different at every RPM Range.

Idle = Cummins
Above Idle-1,200= 6.0L (Turbo Whistle)
1,200-2,000= 6.7L (Mixture of everything)
2,200+= Chevy V8 Gasser/5.0Mustang

That's my Best discreption...Others can chime in and add.

5" Flo-Pro w/Muffler.
bothers me it sounds like a gasser but hey so did the 6.0L at higher RPMs.. i do love the sound of a cummins >.>

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Originally Posted by Turbo Joe View Post
The 6.7 has new direct injection technology which injects diesel multiple times during a single combustion cycle to reduce the diesel "rattle"

Turbo Joe
2012 F250 CC XLT 4x4
i LOVE the diesel rattle.. its what made me fall in love with diesel in the first place.. i'm not much for a quiet ride..i wanna hear the power

2007 Ford F250 Lariat 6.0 Powerstroke

mods:
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Swamps 48V FICM with PHP Atlas 40
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Agressive street, Tow W/jake brake, Economy

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1999 Ford Mustang Cobra 4.6 32V V8
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post #7 of 17 Old 12-11-2012, 08:06 PM
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Like mentioned above the pilot injection makes the motor up front sound quiet. But the exhaust loudness has to do with turbo. And im pretty sure from the front our stock 6.7 sounds more like a diesel than my deleted 6.4. That is one thing I can't stand about my 6.4. I had one guy tell me to delete the dpf and muffler so that its louder when it was already deleted

T-rav
2010 F350 6.4- H&S Single turbo kit, 5" flo pro,No limit SS cold side kit, No Limit intake, MPD billet CCV/oil filler, newton leveling kit, RED Newton traction bars, custom projector retrofit in oem lights and a bunch of LED lights LOL

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post #8 of 17 Old 12-11-2012, 08:15 PM
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In one of Ford's videos debuting the 6.7 they demonstrated turning on and off the Pilot injection, I wonder if this could be done aftermarket?
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post #9 of 17 Old 12-12-2012, 06:42 AM
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Quote:
Originally Posted by bcangelo View Post
In one of Ford's videos debuting the 6.7 they demonstrated turning on and off the Pilot injection, I wonder if this could be done aftermarket?
Yes I recall that. Sounded like a 7.3L without Pilot Injection.


'11 F350 6.7L FX4,
H&S Tuned & Deleted!
5" Flo-Pro
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post #10 of 17 Old 12-12-2012, 06:59 AM
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here is a 6.4 with no pilot injection. sounds soooo much better

New 6.4 Tuning..... Tell me what's missing.... | Facebook

T-rav
2010 F350 6.4- H&S Single turbo kit, 5" flo pro,No limit SS cold side kit, No Limit intake, MPD billet CCV/oil filler, newton leveling kit, RED Newton traction bars, custom projector retrofit in oem lights and a bunch of LED lights LOL

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OUR FLEET: 2015 f450, 2014 Platinum F350, 2012 F450 6.7, 2010 F350 6.4, 2005 F350 6.0, 04 F450 6.0
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