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Old 04-24-2014, 10:20 PM   #41
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I think I'll try this:http://www.drgas.com/Boom-Tube-Muffler_p_32.html
Muffler and tip all in one. I think I'll go 2.5", that way I can go right after the manifold, cut the 2.25" pipe, expander piece to 2.5" all the way to the Boom Tube muffler, cut it off to fit flush at rocker. Look like this: http://www.drgas.com/Boom-Tube-Muffler_p_32.html
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Old 04-25-2014, 10:25 AM   #42
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Quote:
Originally Posted by Sonic_HedgeHog View Post
They did a cool set up on a Raptor here at Rich Ford... Used a marine exhaust pipe/tip that was cut and molded into the rear bumper

Looks pretty nice.
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Old 04-25-2014, 10:30 AM   #43
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Side exhaust not smell through the windows when you have them down?
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Old 04-25-2014, 10:32 AM   #44
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Quote:
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Side exhaust not smell through the windows when you have them down?

I've never noticed it
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Old 04-26-2014, 12:23 PM   #45
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Badass concept IMO, even on a grocery getter.
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Old 04-26-2014, 10:17 PM   #46
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Quote:
Originally Posted by Sonic_HedgeHog View Post
You can look at my dyno numbers and possibly glean some info... I've got the shortened exhaust, only 2.5" though

The large diameter would have a larger impact than a shorter exhaust alone. With the 2.5 diameter of your pipes you would still maintain exhaust velocity. With the cross section of a 3 inch pipe on a naturally aspirated 4 cylinder engine that is not particularly aggressive I would fear this would be compromised, and then add to that less path for the flow.


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Old 04-26-2014, 10:57 PM   #47
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Quote:
Originally Posted by Buildist View Post
The large diameter would have a larger impact than a shorter exhaust alone. With the 2.5 diameter of your pipes you would still maintain exhaust velocity. With the cross section of a 3 inch pipe on a naturally aspirated 4 cylinder engine that is not particularly aggressive I would fear this would be compromised, and then add to that less path for the flow.


Steve
I thought the same thing but there are cars on this Forum with 3in exhaust that have dyno #'s backing it up that a 3in produces more power. GO BIG OR GO HOME!
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Old 04-26-2014, 11:14 PM   #48
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Quote:
Originally Posted by Buildist View Post
The large diameter would have a larger impact than a shorter exhaust alone. With the 2.5 diameter of your pipes you would still maintain exhaust velocity. With the cross section of a 3 inch pipe on a naturally aspirated 4 cylinder engine that is not particularly aggressive I would fear this would be compromised, and then add to that less path for the flow.


Steve
I agree. I think the ars with 3" are on a happy dyno. I think there is like 1 person that I seen anyways.
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Old 05-01-2014, 06:58 PM   #49
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Quote:
Originally Posted by Jburks View Post
I thought the same thing but there are cars on this Forum with 3in exhaust that have dyno #'s backing it up that a 3in produces more power. GO BIG OR GO HOME!
I'd would have to see those before and after dyno numbers. I guess I will look around.



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Old 05-01-2014, 07:49 PM   #50
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Ok, I did a search and looked at 13 different threads and found no dyno sheet or even a report of an N/A focus on a dyno with a 3 inch exhaust.


Our cars were engineered for the majority of "normal" street driving. This requires low end and mid-range torque for accelerating around town and on the on ramp for the highway.

Adding a 3 inch exhaust to this type of car will reduce back pressure which will reduce the scavenging affect, which results in lower torque in low to mid RPM's. There will be an increase in top end horsepower, but that is not practical on the street in a daily driver, just a street racer.

I built a 331 stroker for my wife's 1966 Mustang. I built it for street torque. I have not taken it to a track yet but the dyno number at the wheels is 300 lb. ft. of torque (carb needs the secondaries rejetted). The car has a 2 1/4" dual exhaust with Tri-Y headers. A 3" exhaust would kill the fun that this car is on the street.

The next engine I am building is a 351 Cleveland into a 393 stroker for myself. This one will be built for more power, around 450 - 500 HP, and NA. The car it is going into is STILL not going to have a 3 inch exhaust in order to keep torque up. It will be a higher reving engine than the 331 but it will not be an all out race engine. If I were only racing it I might consider a 3" exhaust, but no way for the street.

This is why I would like to see even ONE dyno sheet of a N/A focus, with stock head and cam, with a 3" exhaust and show an increase at STREETABLE rpm's.


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