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Camaro V6 LFX Engine, Exhaust, and Bolt-Ons For all LFX related parts

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Old 01-22-2014, 09:53 PM   #1
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3.8L vs 3.6L exhaust question

I apologize in advance if this is a stupid question.. Lol.
I'm on YouTube looking at exhaust videos of of the 4th gen 3.8L camaro.
Here's my question. Why do the 3.8L's sound so much meaner than the 3.6L's? I mean I found a lot that sound just like a v8 IMO. I've personally never heard a 5th gen 3.6 that sounded so close to sounding like a v8, even with a full exhaust with headers, cat back, and all that. Maybe somewhat close, but nothing like what an SS sounds like.
I know one is a 3.6 and a 3.8 but what's making it sound so much more aggressive?
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Old 01-22-2014, 10:19 PM   #2
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I know what your talking about, this is just a guess but I'm gonna say the direct injection plays big part in the sound. You can hear the ticking at idle, there's a lot of psi of fuel which I can see can affect the overall tone of the engine. Plus we red line at 7k rpm and 4th gens are 6k, so the exhaust tone up high will sound higher pitched. Besides being only .2 liters difference in size there's prolly not lot in common between the two engines lol
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Old 01-22-2014, 10:34 PM   #3
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Most of the change in sound is because the 3.8 is a 90 degree engine where as the 3.6 is a 60 degree. This seems to have a big impact on engine sound.

Another big advantage to the 3.8 is that there are headers available for most applications, where is the LFX 3.6 there are no headers available due to the cylinder head design.
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Old 01-22-2014, 10:41 PM   #4
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Quote:
Originally Posted by RacnJsn95 View Post
Most of the change in sound is because the 3.8 is a 90 degree engine where as the 3.6 is a 60 degree. This seems to have a big impact on engine sound.

Another big advantage to the 3.8 is that there are headers available for most applications, where is the LFX 3.6 there are no headers available due to the cylinder head design.
Yes that's correct but the LLT models can have headers and it still doesn't sound as aggressive as the 3.8's. I didn't know about the 60/90 degree thing. Thanks
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Old 01-22-2014, 10:42 PM   #5
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Is the 60 degree better or what?
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Old 01-22-2014, 10:49 PM   #6
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Quote:
Originally Posted by RacnJsn95 View Post
Most of the change in sound is because the 3.8 is a 90 degree engine where as the 3.6 is a 60 degree. This seems to have a big impact on engine sound.

Another big advantage to the 3.8 is that there are headers available for most applications, where is the LFX 3.6 there are no headers available due to the cylinder head design.
Which is a positive.
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Old 01-22-2014, 11:02 PM   #7
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Didn't the old 3.8L have pushrods? I believe that would be a big change. OHC V6's just don't produce the same great melodies that push-rod V6's can. My old 3.0L truck sounded meaner than my Camaro....

The V6 in the Camaro has a tech-y sound if that makes sense. Sounds more intelligent but alas wimpier and tinny.
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Old 01-22-2014, 11:03 PM   #8
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The 3.6 LLT and LFX have 4 valves per cylinder. The 3.8 is a conventional 2 valves per cylinder. That is probably most of the difference. The rest will come from how the exhaust is piped through the manifolds, cats, resonators, and mufflers.

I've owned and driven the 4th Gen 3.8 and the 5th Gen 3.6. I think the 3.6 sounds fine and will take the extra HP/TQ that go with it every time.
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Old 01-22-2014, 11:06 PM   #9
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Quote:
Originally Posted by bionick View Post
Is the 60 degree better or what?
Here is an interesting article you can read about cylinder bank angles:
http://www.caranddriver.com/features...angles-feature
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Old 01-22-2014, 11:10 PM   #10
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Cool thanks guys
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