exhaust question??? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 05-05-2008, 11:30 AM Thread Starter
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exhaust question???

well yesterday i cut the cat and muffler out of my truck.
it sounds awsome!!!!!!!!!!!
will this damage my turbo?
how much hp. should i have gained?
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post #2 of 11 Old 05-05-2008, 11:31 AM
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It will not damage your turbo...hard to say how much HP...Maybe 10-20 as a guess, although when I cut out my cat (highly clogged) and muffler there was a major SOTP increase

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post #3 of 11 Old 05-05-2008, 11:32 AM Thread Starter
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well one of my friends said it would but he dont have a diesel
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post #4 of 11 Old 05-05-2008, 02:41 PM
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turbo diesels dont need any extra back pressure because the exhaust has to push on the turbo before it exits out of the pipe...i don't know what the exact ratio is but you have to figure if you are pushing 15 pounds of boost into the engine its gonna take some pressure to spin the turbine from the exhaust so you should be good. What cutting off the exhaust will do is add some HPs but mainly it will lower egts because the gases are getting out faster. You'll get some boost too. It will support additional mods later on though so its a great start.
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post #5 of 11 Old 05-05-2008, 02:50 PM
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same idea here just kinda loud and you get high if you in town at lots of red lights. lol the hood bout to have some strokes whit no zost.
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post #6 of 11 Old 05-05-2008, 03:59 PM Thread Starter
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oh well i just cut it out so i could have some noise and see what it would sound like with straight pipe untill i put my stacks on.
its gonna be a while before i put the stacks on .
will the sound be much different with the stacks than what it is now?
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post #7 of 11 Old 05-05-2008, 04:36 PM
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the sound in the cab will be alot different with stacks because the exhaust is exiting the pipe right next to your head. (especially with a regular cab)

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1995 F-250 4x4 7.3 Powerstroke
Isspro Gauges, Tony Wildman Tunes, PSGH Stage 1 Injectors, Early 99 Intercooler, ATS Stage 6 E4OD, TCI Tranny Cooler, Snow Water/Meth, Traction Bars, EBPV Brake, TC Lockup Switch, Spray-on Liner, K&N Intake w/ NAPA 6637 Filter, 3" downpipe, 5" mitre stacks.
Waiting to be installed: Electric fuel with A1000 pump and Stealth DIY Dual HPOPs
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post #8 of 11 Old 05-05-2008, 04:36 PM
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^ And when I say that its a good thing =)

Nick, BPS Historian
1995 F-250 4x4 7.3 Powerstroke
Isspro Gauges, Tony Wildman Tunes, PSGH Stage 1 Injectors, Early 99 Intercooler, ATS Stage 6 E4OD, TCI Tranny Cooler, Snow Water/Meth, Traction Bars, EBPV Brake, TC Lockup Switch, Spray-on Liner, K&N Intake w/ NAPA 6637 Filter, 3" downpipe, 5" mitre stacks.
Waiting to be installed: Electric fuel with A1000 pump and Stealth DIY Dual HPOPs
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post #9 of 11 Old 05-06-2008, 11:37 AM
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Question

What is better: 3.5" vs. 4" straigh pipe?. pros and contrs? what about sound?
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post #10 of 11 Old 05-06-2008, 02:04 PM
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Id say 4" great sound, breaths easy. I would never go smaller than 3.5"

Nick, BPS Historian
1995 F-250 4x4 7.3 Powerstroke
Isspro Gauges, Tony Wildman Tunes, PSGH Stage 1 Injectors, Early 99 Intercooler, ATS Stage 6 E4OD, TCI Tranny Cooler, Snow Water/Meth, Traction Bars, EBPV Brake, TC Lockup Switch, Spray-on Liner, K&N Intake w/ NAPA 6637 Filter, 3" downpipe, 5" mitre stacks.
Waiting to be installed: Electric fuel with A1000 pump and Stealth DIY Dual HPOPs
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