 Exhaust Size, how big is too big? |
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 May 11, 2004 - 8:43 AM
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 Enthusiast  Joined Sep 28, '03 From Bloomington, IN Currently Offline Reputation: 0 (0%)  |
I was palnning on doing the 3S swap down the road and am looking to get an exhaust now. I was thinking of trying to save money and get 3" exhaust now. Course i'm worried this will just make me sound like ass and not give me the needed backpressure. So what size piping is everyone here running? Should I just go with 2.25 piping as planned?
-------------------- NASA/SCCA RX-7....currently under the knife
92 Civic hatch B16 - Sold 10th anniv RX-7 - RIP The Slow Celica - Sold...and then crushed crushed due to street racing. Quote from Seinfeild: George's Boss reading a magazine: "People magazine's most beautiful people. Oh and a Celica...nothin wrong with that!" |
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May 11, 2004 - 1:54 PM
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 Enthusiast Joined Apr 15, '03 From San Jose, CA, USA Currently Offline Reputation: 1 (100%) |
I was gona do the "exhaust first, swap later" but the shop I went to wouldnt do 3" piping on my stock engine.
What I would sugest, if you really want piping now, just get some 2.25" crush bend for pretty cheap, then do custom mandrel bent when you do the swap. Otherwise, just wait. |
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May 11, 2004 - 6:38 PM
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 Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
You DO NOT NEED BACKPRESSURE!!!!! EVER!!!!
Do some reading on exhaust design and search this site for other posts. I've posted links like 5 times to information on this subject. 3" will be just fine for what you're doing. |
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May 11, 2004 - 10:09 PM
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 Enthusiast Joined Dec 27, '03 From Nor Cal Currently Offline Reputation: 0 (0%) |
The only thing you'll feel is the loss of exhaust velocity... which causes a loss of low-mid range torque... until the 3SGTE anyway... -------------------- "It's ok to be naked girl... I'm an artist!"
1995 AT200 Celica ST: stocked out daily driver... 1984 AE86 Corolla GT-SR5: silvertop 20V 4AGE project car jacked up with goodies... 1991 SW2x MR2 n/a: bare bones hardtop model soon to be... |
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May 11, 2004 - 10:19 PM
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 Enthusiast Joined Dec 30, '03 From Atlanta Currently Offline Reputation: 0 (0%) |
if you keep your cat on then you wont lose as much torque
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May 11, 2004 - 11:11 PM
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Enthusiast Joined Apr 22, '04 From illinois Currently Offline Reputation: 0 (0%) |
kwanza is correct, basically saying, back pressure is needed. Now, on a V8 or something, back pressure is NOT needed, but the un-stable 4 cyl. needs a little backpressure, such as BEEF's opinion, a cat would be enough back.
--------------------  The most important lesson I learned from Karate-Dō Kyōshan – “You can not be what you do not believe you are” |
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May 11, 2004 - 11:30 PM
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 Enthusiast Joined Oct 3, '02 From Va Team 6gc Currently Offline Reputation: 1 (100%) |
see were u guys are getting it wrong is calling it back preasure because that is never good its the momentum of the gas that u are losing because of the size which isn't bad it just doesn't feel right when u are driving.
--------------------  All I have in this world is my Balls and my Word and I'm not breaking em for no one,- Tony Montana Team 6gc 2005 |
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May 12, 2004 - 12:17 PM
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 Enthusiast Joined Mar 4, '03 From Kirkland, Washington Currently Offline Reputation: 0 (0%) |
I have 2.5 mandrel bent
Sounds awesome! :-) -------------------- Cruisin down the street in my Infiniti...always lookin for my next trip to Sin City
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May 12, 2004 - 1:22 PM
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 Enthusiast Joined Jan 17, '03 From Fresno, CA Currently Offline Reputation: 0 (0%) |
how much did it cost for a mandrel bent blackcelicaGT94
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May 12, 2004 - 1:38 PM
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Enthusiast Joined Mar 4, '03 From Kirkland, Washington Currently Offline Reputation: 0 (0%) |
The whole exhaust and pipin is all custom made so it would have ran about 700 bucks. But since i know the guy he only made my dad pay for parts which came to 365
-------------------- Cruisin down the street in my Infiniti...always lookin for my next trip to Sin City
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May 12, 2004 - 9:05 PM
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 Enthusiast Joined Apr 14, '03 From Long Island, N.Y. Currently Offline Reputation: 1 (100%) |
can i use my greddy SP exhaust with the 3sgte motor?
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May 12, 2004 - 9:34 PM
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 Enthusiast Joined Aug 30, '02 From Anaheim, CA Currently Offline Reputation: 0 (0%) |
yes although a 3" exhaust would yield more power, and it would be needed if you plan on getting more than 50hp over stock on the 3sgte -------------------- 1994 Celica GT4 WRC Edition
@gt4.wrc on Instagram |
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May 12, 2004 - 10:40 PM
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Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
GRRRR, If one more person says the words 'need backpressure' without prefacing them with 'You do not', I'm going to freaking go ballistic.
Let me say it again, and everybody say it with me: "You DO NOT need backpressure in a modern internal combustion engine." It has nothing to do with 4cyl, v8 etc, it has to do with cam timing and valve opening and closing events. And lastly, exhaust gas velocity doesn't mean jack after a turbo. Go as big as you can fit and afford. |
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May 13, 2004 - 12:30 PM
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Enthusiast Joined Apr 15, '03 From San Jose, CA, USA Currently Offline Reputation: 1 (100%) |
If you needed back pressure people wouldnt throw test pipes on integra's.... Which for those of you that dont know, is a straight pipe off the down pipe with no cats, or muffler
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May 13, 2004 - 12:52 PM
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Enthusiast Joined Sep 28, '03 From Bloomington, IN Currently Offline Reputation: 0 (0%) |
ok, so back pressure isnt a worry. What i really wanna know now, is will 3" on an n/a sound like ass?
-------------------- NASA/SCCA RX-7....currently under the knife
92 Civic hatch B16 - Sold 10th anniv RX-7 - RIP The Slow Celica - Sold...and then crushed crushed due to street racing. Quote from Seinfeild: George's Boss reading a magazine: "People magazine's most beautiful people. Oh and a Celica...nothin wrong with that!" |
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May 13, 2004 - 10:42 PM
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Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
It probably won't sound great, but it depends on the muffler. I think you might have missed the point of my little rant tho...backpressure you don't need...exhaust gas velocity you do need (on an NA car). 3" is too big for an NA 1.8 or 2.2. I'd go with 2.5 or 2.25 instead. 3" would be perfect for a turbo car. |
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