THANK FOR INFO ON DIESEL TUNER

[montanagal]

Awhile ago, I asked what would be the recommended Diesel tuner for my 2002 Chevy 2500HD w/Duramax.

It seems the Hyper-Tech tuner won out.

I know the best way would be to have a Banks exhaust w/their tuner, but it would be too costly for me.

Thanks to everyone for responding with your point of view.

Daniel J. Dean
2002 Chevy LT 2500HD-Duramax
w/Air Lift - Air Bags
2005 3400RL 5th Wheel Montana

[Dave e Victoria]

One inexpensive alternative to that expensive exhaust is to have a muffler shop core your muffler. This will cut back pressure almost as much as going to the bigger tubes. Having said that, I never bothered as the Hypertech is awesome even without that modification.

[CRUZIN 2]

Dave

What do you mean by core your muffler?

Larry & LaVonne

[Dave e Victoria]

The idea is to cut the inside out of the muffler. They do not actually remove everything. A typical muffler is just two pipes that are capped on the ends and have perforated sides. these Pipes are enclosed in a sealed enclosure. Gases passing through the muffler are forced through the perforations which tends to break up sound pressure into higher frequencies and lower amplitude sound waves. Unfortunately, the restriction are also restrictions on the free breathing of the engine. When coring, the muffler shop extends a tool into each pipe of the muffler and cuts it free. The muffler is still safe as the outside enclosure is not compromised. Back pressure is relieved but the engine may sound louder. Fortunately, diesel engines are more efficient and don't have the "bark" of a gasolene engine; the increase in sound is not very noticeable. (how about that, I got to use a semi-colon -- cool)

I have not personally worked out the figures but, I am told that a nominal 1 inch increase in exhaust pipe will reduce back pressure by about 16% while a muffler alteration will reduce backpressure by about 15%. Also, please note that the effects of these modifications are not additive -- that is -- you can't get a 29% reduction by doing both.

I hope that answers your question
Dave

[CRUZIN 2]

Dave

Thanks for the info. I like that idea better then larger pipes, and I also like a more aggressive sound. Larry & LaVonne

[sreigle]

Excellent description, Dave. Just in case anyone is like me and a picture to go with the description helps, here's a picture of the inside of a typical muffler. Dave, what is cut free? Is there material inside the pipes that is cut out? Like in 'glass packed'?

[CRUZIN 2]

Steve

A picture is worth more then a thousand words, now if we can have Steve do it for us? Larry & LaVonne

[Dave e Victoria]

Steve,
It depends on the internal muffler configuration. On the one in your picture, the pipes would be cut in the perforated area so the gasses flow freely from pipe to pipe. You are right. It is like a glass pack without the glass.

[sreigle]

quote:Originally posted by CRUZIN 2

Steve

A picture is worth more then a thousand words, now if we can have Steve do it for us? Larry & LaVonne

Larry, you don't even want me messin' with your muffler! You need someone knows what they're doing for that!