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sierra 8.1 exhaust

yukon25008.1

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yukon25008.1 Senior Enthusiast

yukon25008.1

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Im thinking of doing the no muffler route.....stainless long tubes, no cats, X-pipe, tailpipes out,..

Just hoping the backpressure isnt not enough causing the TQ to be affected..

mxjunkie123 Enthusiast

mxjunkie123

Posted
Posted

It just depends of the size of the exhaust, but because of your engine it is hard to really go to big. What I would say for you is get lt headers with a 2.5 or 3 inch y pipe to a 3.5 inch exhaust maybe even a little bigger but it depends on what you want from the truck. If you want low end torque keep the exhaust small. If you want top end go bigger. If you tow a trailer a lot you might not like straight out the back because the noise will bounce off the trailer. Just my two cents.

 

desrtrat Senior Enthusiast

desrtrat

Posted
Posted

Just hoping the backpressure isnt not enough causing the TQ to be affected..

 

you want little to no back pressure..what you want is a high viscosity of your exhaust gasses, and the ability to scavenge out your exhaust from the cylinders. on pipe size, going to big will cause the exhaust to slow down causing a "blockage" in the exhaust, slows down flow. to small of a pipe(s) will cause a restriction increasing back pressure. a H pipe or X pipe will help in the scavenging of your exhaust out of the cylinders during over lap of your cam..each exhaust pulse has a high and low area. the high side pushes the pulse in front of it, and the low side helps draws the next pulse with it from the next firing cylinder. on a V8 fires from opposing banks, so with straight pipes/dual mufflers there is no scavenging of the exhaust that can/will reduce the inefficiency of the motor..the feel of low end TQ loss. that's why a H or X pipe should be used..i have some texts on this somewhere on my PC, and will try to find it. this is what i could remember...if you research you will find that the auto exhaust is a very complex system..

 

good luck

yukon25008.1 Senior Enthusiast

yukon25008.1

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man desrtrat that what i was looking for..a good explanation... like i said im still learning about scavenging/pulses

Im not some dumb you kid that just wants sound! I want the exhaust to be perfect and function properly..

the reason i emptied the cats was .i had a feeling there was sluggishness, and when i had the off the truck the were partially blocked, holding them up to the sun and trying to look thru. The truck ffeels great with the raylar cam and blackbear tune..the stainless works long tubes will really wake things up, Again i just want the exhaust to be 110%

Could you give me a call when you get a chance, Id really like to talk with you if possible for a few mminutes...

Thanks again (570)-656-2466.

Mckenzie Senior Enthusiast

Mckenzie

Posted
Posted
Im thinking of doing the no muffler route.....stainless long tubes, no cats, X-pipe, tailpipes out,..

Just hoping the backpressure isnt not enough causing the TQ to be affected..

sounds like an awesome setup IMO only thing I'd change is loose the x pipe and just true dual it the loss of torque will be so small you probably won't even notice it

 

 

Sent from my smartass iPhone using Tapatalk

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