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anyone out there running a 3" exaust dumping in front of the rear wheels? Before it had to be taken in for emissions it was a cat only 2.5", and resonated like crazy in the passanger compartment. The dump was about a foot in front of the rear axel. Would a side dump in front of the passanger rear wheel also cause the resonace issues?
This will sound far-fetched and labor intensive, but have you ever seen a side dump exhaust on the Winston Cup (that's right, I said it) cars?
That is designed that way for a couple of reasons.
With the exhaust dumping under the car, the sound waves bounce off the ground & back to the under side of the car untill it exits the under side of the car.. If you dump to the side, there is nothing for the sound to bounce off of.. Side dump or tail pipes usualy solve most of the resonates in the car.. Although, some mufflers have their own resonate tones (flowmasters).. IMO, get the exhaust out fron under the car, a big deal if you drive with the windows up.. CO2 is hard on your body..
Dave
P.S. My 70 stang w/ 351 cleveland made 22 more rwhp with the tail pipes attached.. 362w/o tails 384 with tails.. FYI..
Dave -- you are still learning 2.3 turbo --
that makes perfect sense on a NA engine -- but on a turbo engine, that won't hold true. --
There is a point of diminishing returns -- but from a performance prespective, more exhaust you can get out of the turbo, the more power it will make.
the backpressure on a turbo engine is between the manafold, and the turbo -- the rest needs to be as free-flowing as possible
Unless you do something like Lee Clary did with the Red 'n Yellow car, it's really hard to get 3" out the side. There are oval pipes that would help, but your overall clearance is going to make ingress and egress from anything but perfectly flat driveways and parking lots tough.
Eric, I stand corrected.. Yup, still learning 2.3 turbo things.. (boy do i have alot to learn) The dump to the side or tail's would clear up his resonace issues, correct?? That is what i was originaly after..
Dave -- if the issue is the sound itself, then yea-- side exhaust should fix it.
Don't think I was 'gettin after ya' -- just making sure you understood the differences between NA, and turbo, and why it would make more hp on your 351, and less on a 2.3
Navy : yea, I got to ride in one a while back... Its what made me think of it. The car I rode in dumped out to a very squished (1" x 6") output, looked good.
Originally posted by bendutro
Unless you do something like Lee Clary did with the Red 'n Yellow car, it's really hard to get 3" out the side. There are oval pipes that would help, but your overall clearance is going to make ingress and egress from anything but perfectly flat driveways and parking lots tough.
Have you seen my current joke of an exaust system? the cat is hanging down so much you can see over the top of it from the side of the car.
Anyway, I need go and take a good long look at the underside and see what I can see. Perhaps 3" back to twin 2" or single 3.5" oval side dump. Got a quote for $235 for a high flow 3" cat and fabing a 3" side dump, they claimed it could be snugged up quite well, but would require moving the fuel lines to the other side. Gives me an excuse to put in new lines anyway.
This is a muffler delete as well. They refused to install sans cat, so I figure that should deaden the sould enough not to be pulled over by my local LEO.
Ill drop by the shop tommorrow and discuss options with them. Thanks for all the input
Dave -- if the issue is the sound itself, then yea-- side exhaust should fix it.
Don't think I was 'gettin after ya' -- just making sure you understood the differences between NA, and turbo, and why it would make more hp on your 351, and less on a 2.3
Eric, Still learning.. Very understandable.. The turbo is pulling some of the air out of the cylinders, where in a NA the piston is doing all the pushing?? The best would be no backbressure after the turbo.. Thanks for straighting that up for me..
Mike, thanks for setting that straight for me.. I thought that once the boost started to build, that the turbo (at higher psi) would start pulling air, but the way that you explained it makes perfect sence.. i never knew that the exhaust pressure was 2X the pressure of the intake.. Very interesting..
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