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#1
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Is this possible
I'd like the simplicity of dumping my exhaust at the rear axle right behind the mufflers but I want to remain fairly quiet definitely no drone, What muffler would you use or is this wishful thinking?
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#2
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Have you done this with any other cars? I've been in lots of muscle cars that are set up like this, and I hate it. It causes a lot of cabin noise (regardless of the muffler you choose) because there are open mufflers directly underneath the floor pan. And then there is the fact that you will smell like exhaust fumes after driving your car for 10 minutes. I'd consider this setup for a drag car, but that's it. I've spent enough time in cars where the exhaust dumps at the muffler to know that it sucks.
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1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
#3
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Nope.....don't do it. Wrong on many levels...exhaust and noise getting into the cabin. Did that when I was young and backed out of it within days.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
#4
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In high school, those were called “turn downs”. As has been said - they are loud. I spent many a day cruising in one - then had my ears ringing for some time afterwards.
If you want to “remain fairly quiet,” you don’t want to do that.
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1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461. |
#5
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Years ago I had a 69 firebird setup like this and yes it was loud, louder than I would want today. I was just wondering if anyone knew of a muffler that might control the noise in this situation. I'm not even sure if a stock type muffler wouldn't be too loud?
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#6
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Carbon monoxide entering the interior of the car is pretty much a given with exhaust exiting under the floor pans, really not a good way to go.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#7
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This. This. Stinking of exhaust and killing a bunch of brain cells gets old really quickly.
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1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
#8
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I ran an axle dump setup in my '70 GTO for years. The pipes were angle to exit roughly behind the rear tire and not just straight over the axle and down. I used Terminator mufflers at the time with headers and 2.5" exhaust. Drone was not an issue, but "remaining fairly quiet" is impossible. For instance, just idling along through a parking garage will set off every car alarm you encounter. Other than that, I loved the sound and fumes in the cabin were a non-issue because of the finish angle of the pipes.
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'70 GP Model J 462 Butler ported 87cc Edelbrock D-ports RPM intake with Holley Sniper 2 CompCams 236/242 hydraulic roller Tribal Tubes tri-y headers TH400 13" Continental "Jim Hand Special" 3.50 9" CurrieTrac, 245/45-18 Front, 275/40-18 Rear |
#9
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Quote:
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"Artificial intelligence is no match for natural stupidity". 1966 GTO Post Coupe, 467ci. N/A Pump gas, best 1/4 11.6 118mph 1966 GTO Post Coupe, "The Bright Idea" 535ci. N/A Pump gas, best 1/4 9.56 139mph |
#10
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I did this on my 68 FB with a new Pypes system at the time. They sent me 2nd gen tails so I just had the shop put on dumps right after the dynomax turbos.
It sounded amazing especially through the mid-range. But the drone off-idle and the booming at idle got old. I think I drove it on and off for year before getting the right tails in. Tail pipes make an exponential difference in noise level. Even with quiet 2.5 turbo mufflers it was LOUD. The fact you are asking if it's possible tells me it's the wrong idea for you I thought it was exhilarating at full throttle! |
#11
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Maybe if you use some stock Honda Civic mufflers. the sound will be reasonable, You'll lose a LOT of power, but it probably won't be too loud.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
#12
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Somewhat related to this topic-
My '37 Buick coupe (Pontiac Tri-Power engine) had glass-packs and short 90 degree tailpipes that came out under the rear of the running boards. No drone, no fumes in car.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) ... or has a Pontiac born the same year as Jim Wangers? (1926} |
#13
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The exhaust contains moisture and corrosive acids which will attack the underside of your floor and anything else under there..
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#14
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Alright thanks for the responses
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