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#1
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Will bigger exhaust help?
I was just wondering. Will an '80 300SD have any power benefit from better exhaust or will it just be louder? I'm generally a believer in OEM equipment.
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#2
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People on here who have reported exhaust mods with no other changes report slightly faster turbo spool up, and not much else in the way of performance gains.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#3
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Quote:
If you want a loud car, a big exhaust pipe will do it. Turbo spool up could be faster. If you want extra HP you need to increase the boost pressure & fuel. Simply, extra power requires extra fuel & air. There are limits though. You have a big heavy car, not a race car. Best you do some reading in the diesel performance sub forum at the top of the page.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#4
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Well, my car needs new exhaust and I was just wondering if larger pipes would help performance. I'm not interested in hot-rodding. It is what it is and I'm OK with it
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#5
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I have taken off the rear muffler on at least three of my benzes. I like to hear a little exhaust noise. I found that I got a little better mileage, perhaps a half mpg or even possibley a mpg. It was hard to be sure though.
I generally took off the factory muff and stored it, replacing it with a $40 pipe bent by the local muff shop guy, then before selling the car I put the stock muff back on.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#6
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like said above, you will notice faster spool ups. like 1800rpm turbo kicking in, instead of 2000... and it'll be louder...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#7
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Take out the resonator instead of the rear pipe.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#8
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I have a 2.5" (same as stock pipe) straight pipe and I have ever so slightly better spool up and torque off the line, but thats about it. And its a LOT louder than a stock exhaust system.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#9
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Maybe on a w124, def not on a w123.
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1981 300TD 4 speed manual Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light |
#10
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Not sure how big of a deal this is on a benz but I know a lot of the diesel truck guys like bigger exhaust systems because it will lower exhaust gas temps. Which in turn will extend the life of the turbo, head gasket, etc...
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1981 240d (The Diplomat Car), 1988 Dodge W250 (The Bruiser), Volvo 262 (The Never Ending Project), 1972 Duece and a Half (Will Winch Over Anything) |
#11
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Thats true if you're doing a turbo back exhaust, I.e. Replace the downpipe with a larger, smooth bend downpipe. However looking at my w124 the stock downpipe, on the stock turbo, looks pretty good.
A cat back isn't going to drop your egts a ton if the factory exhaust isn't all the restrictive.
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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500 Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i |
#12
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As normal Skippy is right. My exhaust rusted out, so went with a 3inch stainless steel straight pipe. The turbo does spool up faster, but I can't say I have more power. Truthfully, I haven't dino'ed her.
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Professional greasecar installer Austin TX 98 Jetta TDI with grease car kit + veg-therm (totaled) 87 MB 300SDL running on B99 / greasecar kit + 30 fphe www.austingreaseguys.com |
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