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-   -   2.5" or 3.0" exhaust? (https://www.homemadeturbo.com/general-discussion-6/2-5-3-0-exhaust-44850/)

surfer 08-22-2005 12:29 PM
2.5" or 3.0" exhaust?
 
Well I got my car booked in for a new exhaust tomorrow, but am not sure whether to get a 2.5" mandrel bent exhaust or to go for a 3" system with crush bends!

the 3" system is a lot cheaper but I'm not sure whether its a bit overkill, this is for a B16 CRX turbo by the way.

Any advice would be helpfull

USS 08-22-2005 12:31 PM
Re: 2.5" or 3.0" exhaust?
 
2.5 mandrel.

3" crush would be okay, but the crush bends tend to be very restrictive.

surfer 08-22-2005 12:39 PM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by Snafubmx234
2.5 mandrel.

3" crush would be okay, but the crush bends tend to be very restrictive.
i wouldnt have thought the 3" crush bends would have an internal diameter of less than 2.5" though

Donald125 08-22-2005 12:47 PM
Re: 2.5" or 3.0" exhaust?
 
def.ly go with the 3'.
i switched from 3 to 2 1/4 and felt a hugh power lost.

USS 08-22-2005 12:54 PM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by surfer
Originally Posted by Snafubmx234
2.5 mandrel.

3" crush would be okay, but the crush bends tend to be very restrictive.
i wouldnt have thought the 3" crush bends would have an internal diameter of less than 2.5" though
Fluid dynamics son. If you keep chaing the diameter of the piping, you lose velocity. That is what exhaust is all about, velocity.

Doofnoil 08-22-2005 01:45 PM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by Snafubmx234
Originally Posted by surfer
Originally Posted by Snafubmx234
2.5 mandrel.

3" crush would be okay, but the crush bends tend to be very restrictive.
i wouldnt have thought the 3" crush bends would have an internal diameter of less than 2.5" though
Fluid dynamics son. If you keep chaing the diameter of the piping, you lose velocity. That is what exhaust is all about, velocity.
true. Get the 3" exhaust and buy some mandrel bends to weld in later when you get more cash.

kain 08-22-2005 02:23 PM
Re: 2.5" or 3.0" exhaust?
 
or just get some flexible exhaust piping from auto zone and do it yourself.

c_piddy 08-22-2005 02:53 PM
Re: 2.5" or 3.0" exhaust?
 
or get a shitty welder from harbour freight, and weld your own... probably cost the same as your custom setup.. what place has mendrel bent 2.5inch but not 3.... find some where else.

chris

bumblezc 08-22-2005 06:16 PM
Re: 2.5" or 3.0" exhaust?
 
I went from 2 1/4 Mandrel to 3" Whitey Bend, Got a nice gain. Datalogged earlier boost, and no loss a top end!

I would say go with 3" and latter change the bends with mandrel

surfer 08-23-2005 12:58 AM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by c_piddy
or get a shitty welder from harbour freight, and weld your own... probably cost the same as your custom setup.. what place has mendrel bent 2.5inch but not 3.... find some where else.

chris
I didnt say they didnt have 3" mandrel bends, a 3" system with crush bends is about £100 cheaper than a system with 2.5" mandrels

Ravage70 08-23-2005 02:07 AM
Re: 2.5" or 3.0" exhaust?
 
well that cuz where u live everything costs 2-3 times more

Spenser 08-23-2005 02:13 AM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by Snafubmx234
Originally Posted by surfer
Originally Posted by Snafubmx234
2.5 mandrel.

3" crush would be okay, but the crush bends tend to be very restrictive.
i wouldnt have thought the 3" crush bends would have an internal diameter of less than 2.5" though
Fluid dynamics son. If you keep chaing the diameter of the piping, you lose velocity. That is what exhaust is all about, velocity.
I"m sorry but you're a dumb ------- idiot. Post turbo exhaust has nothing to do with velocity. You want least amount of back pressure. the bigger the exhaust, the better. Period. ------- schween.

R-MAK 08-23-2005 02:28 AM
Re: 2.5" or 3.0" exhaust?
 
im running a full 3".

Spenser 08-23-2005 02:37 AM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by Travis
im running a full 3".
stop lying faggot.

surfer 08-23-2005 01:21 PM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by Ravage70
well that cuz where u live everything costs 2-3 times more
mandrels are more expensive than crush bends whatever size you have, and yes everything over here is nice and expensive, oh how i love to pay the equivalent of $8 per gallon of fuel.

I dedcided on the 2.5" mandrels as i like my rear LCA's to move!

95IntegRacer 08-23-2005 01:59 PM
Re: 2.5" or 3.0" exhaust?
 
get the kteller exhaust... they have 3'' mandrel bent exhaust system for 200$

USS 08-23-2005 10:42 PM
Re: 2.5" or 3.0" exhaust?
 
Originally Posted by Spenser
Originally Posted by Snafubmx234
Originally Posted by surfer
Originally Posted by Snafubmx234
2.5 mandrel.

3" crush would be okay, but the crush bends tend to be very restrictive.
i wouldnt have thought the 3" crush bends would have an internal diameter of less than 2.5" though
Fluid dynamics son. If you keep chaing the diameter of the piping, you lose velocity. That is what exhaust is all about, velocity.
I"m sorry but you're a dumb ------- idiot. Post turbo exhaust has nothing to do with velocity. You want least amount of back pressure. the bigger the exhaust, the better. Period. ------- schween.

Go and ---- your boyfriend in the ass you dumb canuck. Why don't you read up a bit before post faggot?

con 08-23-2005 11:21 PM
Re: 2.5" or 3.0" exhaust?
 
he is right to a point, na and turbo exhausts are completly differnt when talking about crush bends. You need scavanging on na and crush bends and too large of exhaust kills that but you dont need scavenging on a post turbo exhaust you just dont need restriction or back presure

jinxy 08-23-2005 11:50 PM
Re: 2.5" or 3.0" exhaust?
 
more velocity exiting turbo = less backpresure.. so what the hell are you argueing about spenser


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