Author Topic: Interesting Comparison of exhaust note  (Read 299 times)

nap

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Interesting Comparison of exhaust note
« on: December 31, 2019, 10:47:26 AM »
I don't know if this is the correct spot for this topic since there is no specific section for exhaust threads.

Comparison of exhaust note between a 1970 T/A & 1978 Y-82 T/A.

1970 has Ram Air IV Manifolds with 2.5 inch opening going into a pypes 2.5" down pipe into a Flow Master American Thunder Series exhaust mandrel bent with H-Pipe into Texas TA mufflers and 2.5 inch tailpipes.

1978 Ta has Dougs long tube headers with 1 7/8th inch primary into 3 inch collector with a Pypes 2.5 inch mandrel bent exhaust and x-pipe. Also has Texas TA mufflers.

The 78’ SE has a 406 with 6X#4 heads. The camshaft is a comp cam XE274H. Specs are flat tappet 274/286,230/236,.488/.491, 110LSA. Rockers a roller tip @ 1.5. Compression is 9.5:1.

The ’70 has a 433 RAIV.  Actual 614 heads. The camshaft is a Butler custom grind.  Part # is CCA-BP8022SP.  Specs are hydraulic roller 282/288,230/236,561/573, 112LSA. Roller rockers @ 1.65. Compression is 9.9:1.

Here is the comparison video with both cars:

https://www.youtube.com/watch?v=DcVQ_recmz0

Here is the 1978 by itself to give you an idea of how the car sounds by itself:

https://www.youtube.com/watch?v=uoPq4dDVyW8

I would think the car with the long tube headers would be louder even with the X-pipe. Evidently, not the case.

Do you think I'm wrong with my analysis?
« Last Edit: December 31, 2019, 10:56:31 AM by nap »
2 1978 Y82 S/E T/A's
1979 TATA
1987 T/A
1999 30th T/A
1969 GTO
1970 GTO (Judge Clone)

Formula8

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Re: Interesting Comparison of exhaust note
« Reply #1 on: January 01, 2020, 10:12:55 AM »
Nice cars.  The 70 has a lot more cam and no turndowns.
71 Formula 433, 4 bolt splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, factory intake, "Shaker tuned" Holley 800DP, Tribal Tubes, TKO 600, 3.73 Eaton posi. http://www.factcheck.org/

roadking77

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Re: Interesting Comparison of exhaust note
« Reply #2 on: January 01, 2020, 10:41:50 AM »
Have to say, that 70 is a beautiful car!!!
I have similar exhaust to that in my 77, warmed over 400. Except I have Pypes violators. Very aggressive and sounds similar to your 70. But yes I would think that a car with headers would be louder.
Finished!
77 T/A - I will Call this one DONE!
79 TATA 4sp-Next Project?
79 TATA - Lost to Fire!
86 Grand Prix - Sold
85 T/A - Sold
85 Fiero - Sold
82 Firebird - Sold
'38-CZ 250
'39-BSA Gold Star
'49-Triumph 350
'52-Ariel Red Hunter
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nap

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Re: Interesting Comparison of exhaust note
« Reply #3 on: January 01, 2020, 11:39:22 AM »
Nice cars.  The 70 has a lot more cam and no turndowns.

Formula8,
Thanks.  I hear what you are saying, but I have a friend with a 1979 T/A with the same recipe as I have in my '78.  The only difference is I have headers on mine and he has Ram Air III exhaust manifolds.  At one point, my car was parked next to his at a show.  When both cars were running you could only barely hear my '78.

At another show I had the '70 and my friend had his '79. There was barely a difference between the sound.  The '70 only by a very small fraction.

Thanks,

Jim
2 1978 Y82 S/E T/A's
1979 TATA
1987 T/A
1999 30th T/A
1969 GTO
1970 GTO (Judge Clone)

nap

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Re: Interesting Comparison of exhaust note
« Reply #4 on: January 01, 2020, 11:41:38 AM »
Have to say, that 70 is a beautiful car!!!
I have similar exhaust to that in my 77, warmed over 400. Except I have Pypes violators. Very aggressive and sounds similar to your 70. But yes I would think that a car with headers would be louder.

Roadking77,

Thanks for the comment.  What cam are you running in your 400?

Thanks,

Jim
2 1978 Y82 S/E T/A's
1979 TATA
1987 T/A
1999 30th T/A
1969 GTO
1970 GTO (Judge Clone)

Re: Interesting Comparison of exhaust note
« Reply #4 on: January 01, 2020, 11:41:38 AM »

roadking77

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Re: Interesting Comparison of exhaust note
« Reply #5 on: January 01, 2020, 03:08:52 PM »
I have no idea, I would have to dig out the paperwork from when my motor was rebuilt. I had a Pontiac guy do the work, my only spec's to him, I wanted to run pump gas, more hp than stock and a little bit of giddy up and go. He did a great job with the motor and I am happy with it.
Finished!
77 T/A - I will Call this one DONE!
79 TATA 4sp-Next Project?
79 TATA - Lost to Fire!
86 Grand Prix - Sold
85 T/A - Sold
85 Fiero - Sold
82 Firebird - Sold
'38-CZ 250
'39-BSA Gold Star
'49-Triumph 350
'52-Ariel Red Hunter
'66-BSA Lightning
'01-HD RoadKing

Fbird

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Re: Interesting Comparison of exhaust note
« Reply #6 on: January 05, 2020, 07:43:39 AM »
cam and COMPRESSION....makes noise. headers only make more noise in the INTERIOR of the car.
67 Firebird
1980 Turbo TA (injected 400 now :) )

Bluebandit

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Re: Interesting Comparison of exhaust note
« Reply #7 on: January 05, 2020, 01:30:24 PM »
cam and COMPRESSION....makes noise. headers only make more noise in the INTERIOR of the car.
This.

cyber104

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Re: Interesting Comparison of exhaust note
« Reply #8 on: January 05, 2020, 02:13:57 PM »
cam and COMPRESSION....makes noise. headers only make more noise in the INTERIOR of the car.
This.
Agreed!  I'm not even sure what we are trying to discuss here LOL?
1978 TA 4-Speed W72

79T/Aman

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Re: Interesting Comparison of exhaust note
« Reply #9 on: January 16, 2020, 08:04:30 AM »
as others have noted, too many other factors affect exhaust sound, not to mention sound quality lose in video, this is what happens when some exhaust companies use sound bites to sell a product.
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Re: Interesting Comparison of exhaust note
« Reply #9 on: January 16, 2020, 08:04:30 AM »
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