How does a bigger exhaust lower EGT's - Dodge Cummins Diesel Forum
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post #1 of 6 (permalink) Old 02-04-2008, 03:19 PM Thread Starter
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How does a bigger exhaust lower EGT's

Just wondering how and why a bigger exhaust would lower my EGT's?? This might sound like a stupid question to some people but I don't know that much about this stuff.... Why is it so important to keep EGT's low??


01.5 6spd 4x4, TSTCOMP/EZ, DDP 110s, all supporting mods
01.5 P-PUMP 5spd 4x4 215(600cc), 191 dvs, 5k springs, 181/210, 7x.012 w .030 lift, 66/74/14, 26* timing, all supporting mods
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post #2 of 6 (permalink) Old 02-04-2008, 03:21 PM
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It lowers EGT's because it allows the turbo to breathe better which helps get more of the exhaust gasses out. It's better flowing.

It's important to keep egt's cool cause if you don't then you run the risk of melting a piston and damaging the motor. 1250* sustained is ok and short bursts over that are fine. Just don't hold them.

2001 QC SB AT 4X4 p-pumped
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post #3 of 6 (permalink) Old 02-04-2008, 03:23 PM
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big blue is exactly right. ive seen trucks with stacks like 7 or 8 inch that dont go over 1300-1400 at anytime.

2001 2500 white ext cab /edge comp /edge jammers/ 4" straight pipe.
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post #4 of 6 (permalink) Old 02-04-2008, 03:34 PM Thread Starter
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I dont want stacks.... with that in mind.... how big of an exhaust should I go with?? Would goin from a 3 1/2 to a 4 inch exhaust make a huge diff??

01.5 6spd 4x4, TSTCOMP/EZ, DDP 110s, all supporting mods
01.5 P-PUMP 5spd 4x4 215(600cc), 191 dvs, 5k springs, 181/210, 7x.012 w .030 lift, 66/74/14, 26* timing, all supporting mods
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post #5 of 6 (permalink) Old 02-04-2008, 04:09 PM
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5" will support 600+hp. 4" will support up to 600hp. People that run 7-8" stacks need help since a stack is nothing more than an exhaust tip and IMO anything bigger than 6" looks stupid. A 5" stack will run the same temps as a 7" stack assuming all the piping up to the stack is the same size.

Honestly, if your stock or near stock the stock exhaust will do just fine. The stock exhaust is good till around 400hp. If you want, just straight pipe the stock exhaust or put in a straight through muffler and you'll be fine.

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post #6 of 6 (permalink) Old 02-05-2008, 12:03 AM
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my egets dropped about 300 from stock to 4in w/ muff and egt is important because pistons will melt @ around 1500 if sustanted for a long period mine still got high when i towed 10k w/ it on 2 this is all before injectors

2001|260k|6speed|ppumped 180hp|181dv|4kgsk|93 lines&tubes|188/220|110 springs|Cpp 7x12|62/71/12|4in exh |s&b intake|tunnelram|raptor150|1/2 fuel line dram straw|sb dd 3600 |bd 3gen adj track bar| h2's 35 toyo at2
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