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Dynomax turbo muffler installed
Posted: Thu Mar 02, 2006 5:57 am
by fngearhead
I was planning to do the install with help from a friend, but took it to Midas instead. Good choice in the end since Midas has a flame wrench and I don't. It sounds really good, nice mellow rumble. I was expecting it to be louder than it is, but I'm glad to err on the quiet side. It rumbles nicely below 3000 revs and is barely noticeable at 75mph.
Is it worth pulling the smaller cat to try and liven up the old N/A even more? Not looking to get obnoxious, but now that I'm making noise I want a bit more.
Posted: Tue Mar 21, 2006 12:42 pm
by realfinn
Not to bust in on your thread man but I was kinda wondering the same thing. Does anyone know if the loss of back pressure will have a bad effect on the engine? I have heard of guys having problems with some V8's when they do this.
Posted: Tue Mar 21, 2006 8:32 pm
by 92whitelegacy
Turboed cars = backpressure = enemy
N/A cars = backpressure = friend = not TOO much, but you still need to have some.
Posted: Wed Mar 22, 2006 1:04 am
by realfinn
Yeah, one of my neighbors builds race car engines, he claimed he had cracked an exhaust valve once because he had so little backpressure with the wrong setup. I think he was running open headers. Can this happen or is he feeding me a bunch of bull?
Posted: Wed Mar 22, 2006 5:23 am
by Subtle
On N/A engines greater power can be obtained with minimal ( ie zero) back pressure.
By tuning the lengths of the exhaust stacks an "extractor " effect comes in.
If somebody is burning valves they are running too lean. If you want to push the lean use titanium or sodium-filled valves.
Posted: Wed Mar 22, 2006 12:35 pm
by realfinn
Its good to know my neighbors not just loading me with BS...
Sorry for hijacking the thread fngearhead.
Posted: Wed Mar 22, 2006 7:03 pm
by sammydafish
realfinn wrote: with the wrong setup.
these are the key words here. Backpressure increases pumping losses which is bad on any engine. Engines will always make more peak power with less backpressure. Often N/A engines will loose low end torque when opening up the exhaust. This is due to loss cylinder filling during the overlap phase of the cams. Proper adjustments to cam timing will fix this. The engine operates as a complete system, changes to one part must take into account the affects on the other parts. WAY to many people don’t grasp this concept.
Posted: Thu Mar 23, 2006 12:58 pm
by realfinn
Now we're talking my language. Makes sense.
Thanks.