 911 Sport exhast, tail pipe size |
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| retrotech |
 Dec 14 2004, 08:29 PM
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#1
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retrotech  Group: Members Posts: 470 Joined: 2-November 03 From: Mosier, Oregon Member No.: 1,302  |
How much performance influence, if any, would the length, and diameter of the 2 exhaust pipes, on 911 Sport muffler? Would increasing from 2" exits to 3" have any effect?
Thanks, Retro |
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| Joe Bob |
Dec 14 2004, 09:51 PM
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#2
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
QUOTE(retrotech @ Dec 14 2004, 06:29 PM) How much performance influence, if any, would the length, and diameter of the 2 exhaust pipes, on 911 Sport muffler? Would increasing from 2" exits to 3" have any effect? Thanks, Retro Depends on the motor......some injected models like back pressure. Carbed models with the right cam will wake up and appreicate a high flow....at the detriment to low end torque. |
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| retrotech |
Dec 14 2004, 11:12 PM
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#3
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retrotech Group: Members Posts: 470 Joined: 2-November 03 From: Mosier, Oregon Member No.: 1,302 |
I didn't think by the time exhaust passed through heat exchangers & muffler, that the tail pipes would effect much. The engine is 2.8 carburated 46mm Webers.
So you think it will effect my low end torque? Thats not what I wanted to hear, I already bought these nice 3" Stainless pipes to weld to Sport muffler. Retro |
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| sixnotfour |
Dec 15 2004, 01:39 AM
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#4
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914 Wizard Group: Members Posts: 10,423 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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Do like the import guys weld the bigger pipe over the smaller one. Make the inner one at little shorter. Or make it into a cookie cutter. Big stainlees and keep yur torque
(IMG:style_emoticons/default/burnout.gif) |
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| retrotech |
Dec 15 2004, 10:58 AM
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#5
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retrotech Group: Members Posts: 470 Joined: 2-November 03 From: Mosier, Oregon Member No.: 1,302 |
Thank you for that suggestion, that is exactly what I am going to do! I appreciate the suggestion.
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| Joe Bob |
Dec 15 2004, 11:04 AM
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#6
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
That's one way....
btw, it also depends...like you mentioned on the whether you are running headers, HEs and in what style. |
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| retrotech |
Dec 15 2004, 11:10 AM
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#7
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retrotech Group: Members Posts: 470 Joined: 2-November 03 From: Mosier, Oregon Member No.: 1,302 |
Factory 914/6 heater boxes, that I will change to headers in the spring. Does that change the opinions?
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| Eric_Shea |
Dec 15 2004, 11:49 AM
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#8
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PMB Performance Group: Admin Posts: 19,274 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
I went with 2"
I don't think there's a difference between the factory heat exchangers and headers other than they have the heat boxes wrapped around them. Once you do the Sport Muffler mod, there's not much in the way of baffling to slow you down so back pressure may be an issue. Attached image(s) 
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| retrotech |
Dec 15 2004, 03:18 PM
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#9
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retrotech Group: Members Posts: 470 Joined: 2-November 03 From: Mosier, Oregon Member No.: 1,302 |
That is why cutting the 2" tail, 3" shorter, and install 3" stainless shield over it?
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| retrotech |
Dec 15 2004, 03:27 PM
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#10
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retrotech Group: Members Posts: 470 Joined: 2-November 03 From: Mosier, Oregon Member No.: 1,302 |
Sorta like this, but with deeper rear skirt, and when 2" pipes are cut back 2" they won't show.
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| scooter311 |
Dec 15 2004, 03:46 PM
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#11
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Member Group: Members Posts: 231 Joined: 22-October 04 From: Upstate NY Member No.: 2,986 |
Hey, anyone here do that to a 2.0 (4cyl) muffler?
Retrotech, that's exactly what I wanna do for mine. I was thinking I need a banana style/Bursch to hack (IMG:style_emoticons/default/welder.gif) Hmmmm? |
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| J P Stein |
Dec 15 2004, 03:52 PM
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#12
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
I went with one of these.... because of this. http://www.triadwestperformance.com/images.../CRANEY_TXT.htm
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| sixnotfour |
Dec 15 2004, 05:18 PM
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#13
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914 Wizard Group: Members Posts: 10,423 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains
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If someone wants a Triad like JP.s I got one For Sale 140.00
Used about 3 months. Been sitting around 2 years. |
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| Joe Bob |
Dec 15 2004, 05:21 PM
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#14
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
You have a PM
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