Exhaust Size If Turbo'd Up To 8psi
Thread Starter
Registered!!
Joined: Nov 2002
Posts: 59
Likes: 0
Rep Power: 0 
Actually, I'd have a 2.5" downpipe and flexpipe going to a high-flow cat, but then from the cat-back, my exhaust is only 2.25".
I don't want to upgrade to 2.5" exhaust since I just acquired the 2.25" recently.
I noticed that RiceBurnrEX (who is running 197whp @ 8psi) kept his 2.25" system -- hopefully it's not restrictive at 8psi.
RiceBurnrEX? Do I need to upgrade?
--J.
I don't want to upgrade to 2.5" exhaust since I just acquired the 2.25" recently.
I noticed that RiceBurnrEX (who is running 197whp @ 8psi) kept his 2.25" system -- hopefully it's not restrictive at 8psi.
RiceBurnrEX? Do I need to upgrade?
--J.
Joined: Jul 2002
Posts: 13,151
Likes: 3
From: Washington DC
Rep Power: 425 
Quote
[hr]Originally posted by: JohnyBlaze
Would 2.25" catback system be okay? Or would it be too restrictive?
Stock WRX's only use 2.25" -- I think 2.25" would be okay with only 8psi.
What do you think?
--J.[hr]
[hr]Originally posted by: JohnyBlaze
Would 2.25" catback system be okay? Or would it be too restrictive?
Stock WRX's only use 2.25" -- I think 2.25" would be okay with only 8psi.
What do you think?
--J.[hr]
I keep seeing the GTi guys going to 2.5 or 3" turbo backs, but they're usually running much more boost. If you have a 2.5" downpipe... you should probably run a 2.5" from the cat-back.... shrinking the pipe will add restriction. Restriction is a good thing for N/A engines, but once you turbocharge it... it's your enemy.
I Am Legend
iTrader: (2)
Joined: Jan 2003
Posts: 955
Likes: 0
From: Katy (H-town), Texas, US
Rep Power: 0 I found a custom made one for 7k, but I was trying to find out if there was a little cheaper one, 7k isn’t like 3 or 4 months pay. Where did you find out about that particular turbo, and yes this is the first time being on 2k1, I got pulled over by another 2k today askin bout my kit and he told me about a 2k1 meeting a few Saturdays ago, and about this site, so hear I am…
Registered!!
iTrader: (1)
Joined: Sep 2002
Posts: 2,227
Likes: 0
From: Pittsburgh, Pennsylvania, US
Rep Power: 0
Quote
[hr]Originally posted by: Boilermaker1
WRX's are restricted as hell... there's like 3 catalytic converters clogging the exhaust up. But taking 2 of them off adds like 50 HP.
I keep seeing the GTi guys going to 2.5 or 3" turbo backs, but they're usually running much more boost. If you have a 2.5" downpipe... you should probably run a 2.5" from the cat-back.... shrinking the pipe will add restriction. Restriction is a good thing for N/A engines, but once you turbocharge it... it's your enemy.[hr]
[hr]Originally posted by: Boilermaker1
Quote
[hr]Originally posted by: JohnyBlaze
Would 2.25" catback system be okay? Or would it be too restrictive?
Stock WRX's only use 2.25" -- I think 2.25" would be okay with only 8psi.
What do you think?
--J.[hr]
[hr]Originally posted by: JohnyBlaze
Would 2.25" catback system be okay? Or would it be too restrictive?
Stock WRX's only use 2.25" -- I think 2.25" would be okay with only 8psi.
What do you think?
--J.[hr]
I keep seeing the GTi guys going to 2.5 or 3" turbo backs, but they're usually running much more boost. If you have a 2.5" downpipe... you should probably run a 2.5" from the cat-back.... shrinking the pipe will add restriction. Restriction is a good thing for N/A engines, but once you turbocharge it... it's your enemy.[hr]
Registered!!
iTrader: (4)
Joined: Apr 2001
Posts: 6,995
Likes: 0
From: Houston, Texas, US
Rep Power: 376
Quote
[hr]Originally posted by: CGodwin3103
I found a custom made one for 7k, but I was trying to find out if there was a little cheaper one, 7k isn’t like 3 or 4 months pay. Where did you find out about that particular turbo, and yes this is the first time being on 2k1, I got pulled over by another 2k today askin bout my kit and he told me about a 2k1 meeting a few Saturdays ago, and about this site, so hear I am…[hr]
[hr]Originally posted by: CGodwin3103
I found a custom made one for 7k, but I was trying to find out if there was a little cheaper one, 7k isn’t like 3 or 4 months pay. Where did you find out about that particular turbo, and yes this is the first time being on 2k1, I got pulled over by another 2k today askin bout my kit and he told me about a 2k1 meeting a few Saturdays ago, and about this site, so hear I am…[hr]
I Am Legend
iTrader: (2)
Joined: Jan 2003
Posts: 955
Likes: 0
From: Katy (H-town), Texas, US
Rep Power: 0 Thanks Red, I live in the west side at I-10/Dairy Ashford. Guy named Carl said that there was a meeting of 2k1’s 2 Saturdays before this week. I thought about goin to the next one, and was gonna check for dates. I actually would like to attend a meet, and I always love to imbibe a little information hear and there.
DIY King
iTrader: (61)
Joined: Apr 2001
Posts: 11,469
Likes: 0
From: Shrewsbury, Massachusetts, US
Rep Power: 420 After reading Corky Bell's book "Maximum Boost" there is one rather important thing to consider. I quote...
Since we have a 2.25" throttle body we should have something larger for the exhaust pipes. A 2.5" exhaust would be allright. From this chart in that book it looks like a 2.5" exhaust is optimal for up to 500bhp. That might be overkill if you never plan to make that much power. A 2.25" exhaust is capable of flowing up to 300bhp optimally. This contradicts the quote, so I don't quite understand the chart in this book. Anyway, he also says that you can choose a pipe size about 10% larger than the turbine outlet diameter. Hope this helps...
Quote
[hr]The tubes for the hot gas on the exhaust side should therefore be larger than the tubes for the cooler intake side.[hr]
[hr]The tubes for the hot gas on the exhaust side should therefore be larger than the tubes for the cooler intake side.[hr]
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
Touge
Canada East
0
Jul 28, 2015 09:46 PM
Touge
Ottawa
0
Jul 18, 2015 05:38 PM
Touge
Canada East
0
Jul 18, 2015 05:37 PM
