4" vs 5".. is there really a difference. - Page 9 - Chevy and GMC Duramax Diesel Forum
07.5-2010 LMM Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 01-14-2013, 06:21 PM   eBay Motors  #81 (permalink)
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makes sence if you think about it. but im sure there are trucks on the site that has had both 4" and 5" and im also confident in saying that it dont hardly make a difference. So base your decision on exhaust note, not on performance it will provide. IF any itll make egts cooler but again i doubt there will be much difference if your downpipe is stock. Ive never seen EGTs above 1200 degrees. that was pulling my dump trailer with the track steer in it. Dont know what the temp was outside but it was warm mind you, somewhere like 85-95.
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Old 01-14-2013, 06:27 PM   eBay Motors  #82 (permalink)
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Quote:
Originally Posted by mackyoudip View Post
Turbos create back pressure, A LOT of it, that's why you can do that.
Diesels have no need for backpressure.
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Old 01-14-2013, 06:28 PM   eBay Motors  #83 (permalink)
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ok, well put.. so why dont we all do muffler deletes on stock pipes and run those? not much diff between stock and 4''... performance.. duh..there may or will not be any diff in performance between 4 or 5 but i will garauntee you that a 5 will flow more than a 4, "especially" if the down pipe is larger than stock.. come on guys...
they sound different for a reason
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Old 01-14-2013, 06:32 PM   eBay Motors  #84 (permalink)
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Quote:
Originally Posted by Diesel Dan View Post
Diesels have no need for backpressure.
Every engine has a need for backpressure. Turbo diesels get it from the that huge restriction called a turbo. Why do you think you can put a 4" exhaust on a v6 ecoboost? And yes I know it sounds gay just an example


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Old 01-14-2013, 06:37 PM   eBay Motors  #85 (permalink)
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Quote:
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Every engine has a need for backpressure. Turbo diesels get it from the that huge restriction called a turbo. Why do you think you can put a 4" exhaust on a v6 ecoboost? And yes I know it sounds gay just an example


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I didn't know eco boosts were diesels

Has nothing to do with a turbo, N/A diesels don't have a need for exhaust restriction either.

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110 HP tune Kryptonite tie-rods / Cognito braces

BFG KM2 305/65R17 (33x12.50") on H2's
Timbrens front, Hellwig overload springs rear, Bilstein 5100's, Rhino lined bed, '06 tow mirrors, camo seat covers, High Idle switch, Gadsden sticker on rear glass


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'98 Jeep XJ 4.slow / Auto
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Old 01-14-2013, 06:43 PM   eBay Motors  #86 (permalink)
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Quote:
Originally Posted by Diesel Dan View Post
I didn't know eco boosts were diesels

Has nothing to do with a turbo, N/A diesels don't have a need for exhaust restriction either.

Don't youtube mechanic me
My point wasn't that they're diesel, they have turbos. Please explain to me how a turbo has nothing to do with backpressure.


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rare parts gen2, bilstein 5100s, all season brace,
merchant pump rub fix, drp trans cooler lines,
air dogII 165
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Old 01-14-2013, 06:50 PM   eBay Motors  #87 (permalink)
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Im sure there is a benifit but i didnt think it was worth another 300 dollars for an inch of piping i may or may not like the way my truck sounds, but it did lower egts considerably.

And i will refer to my last post. diesel or NOT a Naturally aspirated motor needs a certain amount of backpressure. and Boosted Engine wheter it be supercharged or Turbo charged really does not need any amount of backpressure.

How many turbo charged or supercharged race cars do you see with a full exhaust system? And i know alot of N/A race cars dont have full exhaust but the pipe they use are smaller and/or longer. It just makes sence. You forcing air in and out so you dont need backpressure. and with a N/A engine you need a certain amount of backpressure to draw air in as the exhaust gas exits the combustion chamber
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Old 01-14-2013, 07:00 PM   eBay Motors  #88 (permalink)
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to each his own.. lets all run 2'' pipes rfrom turbo back because aperently exhaust size and back pressure do not effect or play a role in how any motor runs or performs..
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03 lb7 ccsb 4x4 inch lower than stock 20" mkw's 305/50/20 cooper zeons
auto meter boost/pyro/trans gauges- traction bars- 5'' DE 5" to 7" black mitre cut stack- PPE BIV- AD II 200 lift pump- edge insight CTS- spectre CAI- 45% over injectors- LMM cp3 & FPR -EFI live dsp5 from tony burkhard and danville performance
suncoast stage 4 trans, goerend "ML style" triple disc billet converter
Passin' 35psi on stock IHI with 290k on it
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Old 01-14-2013, 07:03 PM   eBay Motors  #89 (permalink)
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are you not reading clearly? Because i know i clearly stated the difference between and Natrural aspirated engine(if you know what that means) and a boosted engine.... Read again.
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Old 01-14-2013, 07:17 PM   eBay Motors  #90 (permalink)
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k, sorry i skim read that, i agree with u.. on our motors needed much or any the up pipes are small enough to create enough
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Eddie "boost master"
03 lb7 ccsb 4x4 inch lower than stock 20" mkw's 305/50/20 cooper zeons
auto meter boost/pyro/trans gauges- traction bars- 5'' DE 5" to 7" black mitre cut stack- PPE BIV- AD II 200 lift pump- edge insight CTS- spectre CAI- 45% over injectors- LMM cp3 & FPR -EFI live dsp5 from tony burkhard and danville performance
suncoast stage 4 trans, goerend "ML style" triple disc billet converter
Passin' 35psi on stock IHI with 290k on it
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