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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / December 2007Turbo Muffler on a 4cyl
In the summer I replaced the splitting muffler on my 4cylinder Ranger with a Thrush Turbo. It was partially as a joke. I remember Turbos on V8 cars getting gradually louder over time, but on the 4 it seems to have hit a 'loudness limit' of some sort. At first I figured that maybe it was a lesser volume of air, but in all reality my 2.5L 4cyl is about the same as half a 5.0L V8 with dual exhaust. Something also odd- On V8 cars I remember the Turbo muffler being quiet at low RPMs or a cruise with no load, but then 'opening up' and getting loud when you put your foot into it. The one on my truck is just the opposite- noisy at idle, half as loud at cruise, and when I put the pedal to the floor it is completely silent! Bizzaro! -ph > I remember Turbos on V8 cars getting gradually louder over time, but > on the 4 it seems to have hit a 'loudness limit' of some sort. At > first I figured that maybe it was a lesser volume of air, but in all > reality my 2.5L 4cyl is about the same as half a 5.0L V8 with dual > exhaust. My '89 Grand Marquis 5.0L is goofy. A year or so ago the car started making a swooshing sound on acceleration, like something was pumping air through a hose into the atmosphere. Turned out there was a BIG hole in the muffler and the exhaust pipe, and the car was just not one to make a lot of noise. It's definitely quieter with a new pipe and muffler, but even with the holes it was quieter than many stock models of other cars.  SignatureDec. 6 (Bloomberg) -- Government officials and activists flying to Bali, Indonesia, for the United Nations meeting on climate change will cause as much pollution as 20,000 cars in a year. > In the summer I replaced the splitting muffler on my 4cylinder Ranger > with a Thrush Turbo. It was partially as a joke. [quoted text clipped - 14 lines] > > -ph It's the rpm difference, the V8 is cruising at the 4's fast idle and the 4 is screaming at highway speed instead of lower rpm roaring. I put a turbo Dynomax on my straight six Jeep engine and it roars nice under power, but only turns 1750 rpm in top gear at 65 mph. Just my $0.02, Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 'New' frame in the works for '08. Some Canadian Bush Trip and Build Photos: http://mikeromainjeeptrips.shutterfly.com > > In the summer I replaced the splitting muffler on my 4cylinder Ranger > > with a Thrush Turbo. It was partially as a joke. [quoted text clipped - 22 lines] > > Just my $0.02, Makes sense. So I spose that the turbo muffler is sort of 'tuned' to be resonant in the cruise range of the V8. There's a guy round the corner from me with a late 80s Cherokee or Wagoneer that sounds something like that- Straight six with a burned- out Turbo or cherry bomb. It's pretty loud, and I'm sure it annoys the hell out of everyone else on my street but I think it sounds pretty cool. Thenagain, I'm one of those weirdos that sometimes turns off the radio so I can just listen to the vehicle. ;-O -ph >>>In the summer I replaced the splitting muffler on my 4cylinder Ranger >>>with a Thrush Turbo. It was partially as a joke. [quoted text clipped - 25 lines] > Makes sense. So I spose that the turbo muffler is sort of 'tuned' to > be resonant in the cruise range of the V8. I don't think its RPM. Most 4-cylinder cars I've rented recently cruise at about the same RPM or only slightly higher than a v8. The big difference is the firing pattern. When you use a turbo muffler on one bank of a v8, it sees an irregular firing pattern because "90-degree crankshaft" v8s (virtually all production v8 engines) do not alternate between left (L) and right (R) banks, but fire L-R-L-L-R-L-R-R (repeat). That's what causes the typical v8 "burble" exhaust sound even with single exhaust. If you put the same muffler on each bank of a "flat crank" v8 (never used in production cars because they vibrate like a paint shaker) then it would sound like two 4-cylinder engines. > In the summer I replaced the splitting muffler on my 4cylinder Ranger > with a Thrush Turbo. It was partially as a joke. [quoted text clipped - 14 lines] > > -ph Don't buy the expensive/good turbo's. You want the cheap ones. They're the ones that "burn out"/get a deeper/throatier sound with age. The good ones are made to hold up longer and not change their tune. Years ago I was buying Walker Universal Turbos for $15/$20 each and they "burned out" nicely. Stocked the common sizes. (2", 2 1/4", 2 1/2", center inlet/oulet, offset inlet/outlet) Turbos, not glass packs. Glass packs don't burn out as much/any, and are a totally different sound. (never cared for glass packs) Had a pipe bender and did alot of dual exhaust. |
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