SOHC turbo....Which exhaust to use... 2.5" or 3" ? Details inside....
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From: Trinidad, W.I.
SOHC turbo....Which exhaust to use... 2.5" or 3" ? Details inside....
On a D16z6, stock internals, going turbo soon...
I am going to be running a 14b turbo/w/g (anyone know the stock boost on this w/g spring ???) at the stock boost for now, but plan to up the boost in the future.
I plan to use a stock canister style muffler for the street, no axle back for the track.
I have BOTH a 2.5" mandrel bent C/B on the car now, w/ cat (plan to run w/o cat), but I also have a single unit, 3" mandrel bent C/B, waiting to be flanged (The 3" is a SINGLE piece of piping, mandrel bent from DP to muffler tip (no muffler, but will put one)
Now if I go w/ the 2.5, I'll need to get a test pipe to replace the cat, if I go 3", I'll need to flange it on both ends. Cost of using either will be almost the same, so I just need input on which would give me better:
Spool, less noise, less lag...etc.... any ups/downs would be greatly appreciated.
Please keep in mind, my turbo's size.
X2
I am going to be running a 14b turbo/w/g (anyone know the stock boost on this w/g spring ???) at the stock boost for now, but plan to up the boost in the future.
I plan to use a stock canister style muffler for the street, no axle back for the track.
I have BOTH a 2.5" mandrel bent C/B on the car now, w/ cat (plan to run w/o cat), but I also have a single unit, 3" mandrel bent C/B, waiting to be flanged (The 3" is a SINGLE piece of piping, mandrel bent from DP to muffler tip (no muffler, but will put one)
Now if I go w/ the 2.5, I'll need to get a test pipe to replace the cat, if I go 3", I'll need to flange it on both ends. Cost of using either will be almost the same, so I just need input on which would give me better:
Spool, less noise, less lag...etc.... any ups/downs would be greatly appreciated.
Please keep in mind, my turbo's size.
X2
Thread Starter
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From: Trinidad, W.I.
Re: SOHC turbo....Which exhaust to use... 2.5" or 3" ? Details inside.... (Camp1320)
Bump for any other opinions... I'd eventually go as high as 10psi on this block/turbo setup, btw....
X2
X2
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From: Naples, Fl, USA
Re: SOHC turbo....Which exhaust to use... 2.5" or 3" ? Details inside.... (Camp1320)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Camp1320 »</TD></TR><TR><TD CLASS="quote">the 2 1/2 is not only a sight bite lighter but will also give you a lil be better response on low to mid range(meaning less lag)</TD></TR></TABLE>
You're saying a 2.25" exahust would give you quicker spool than a 3"?? Surley you can't mean that... I think it's universaly understood, less exahust restriction = faster spool. I went from a 2" Civic Si catback on my EX to a full 3" and the difference was absolutley sick, but even with the 3" I'd still get MUCH quicker spool when I'd run open DP. The best exahust for turbo, is no exahust, but since that's not readily feisable for most of us, 3" is the next best bet.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">
. Usually fully fully built SOHC and alot of DOHC and DOHC/VTEC will run 3 inch.Hope this helps
</TD></TR></TABLE>
I ran a 3" and tons of other stock motor SOHC/DOHC guys do or have and will tell you, it's worth every penny.
You're saying a 2.25" exahust would give you quicker spool than a 3"?? Surley you can't mean that... I think it's universaly understood, less exahust restriction = faster spool. I went from a 2" Civic Si catback on my EX to a full 3" and the difference was absolutley sick, but even with the 3" I'd still get MUCH quicker spool when I'd run open DP. The best exahust for turbo, is no exahust, but since that's not readily feisable for most of us, 3" is the next best bet.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">
. Usually fully fully built SOHC and alot of DOHC and DOHC/VTEC will run 3 inch.Hope this helps
</TD></TR></TABLE>
I ran a 3" and tons of other stock motor SOHC/DOHC guys do or have and will tell you, it's worth every penny.
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From: Trinidad, W.I.
Re: (crucial si)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crucial si »</TD></TR><TR><TD CLASS="quote">either way x2..your going to have to figure everything out..what size piping are you oging to use for the charge pipe and so on...</TD></TR></TABLE>
I have a 2.25" charge pipe/I/C setup I can use.... don't feel like spending more money to go bigger.
The reason I posed the 2.5" vs 3" is that I already have the 2.5" on the car... putting in my 3" would cost more $$.
I know VTC's vote is 3", and it did make his car spool faster, so I am thinking I'll def go w/ 3", even with the 'low' boost and small turbine. It's true that the bigger the exhaust, the faster the spool... the old 'backpressure' myth for low end tq just doesn't hold true for boosted cars.
Hey Crucial.... wanna buy my 2.5" ? PM me on iSS.
X2
I have a 2.25" charge pipe/I/C setup I can use.... don't feel like spending more money to go bigger.
The reason I posed the 2.5" vs 3" is that I already have the 2.5" on the car... putting in my 3" would cost more $$.
I know VTC's vote is 3", and it did make his car spool faster, so I am thinking I'll def go w/ 3", even with the 'low' boost and small turbine. It's true that the bigger the exhaust, the faster the spool... the old 'backpressure' myth for low end tq just doesn't hold true for boosted cars.
Hey Crucial.... wanna buy my 2.5" ? PM me on iSS.
X2
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From: Trinidad, W.I.
Re: (Stu)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Stu »</TD></TR><TR><TD CLASS="quote">What manifold are you going to use?</TD></TR></TABLE>
Older SFP log style.
Been thinking... 3" straight thru is BIG... reconsidering the 2.5" option.
X2
Older SFP log style.
Been thinking... 3" straight thru is BIG... reconsidering the 2.5" option.
X2
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Thread Starter
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From: Trinidad, W.I.
Re: (turbod16y8)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbod16y8 »</TD></TR><TR><TD CLASS="quote">im running a 14b at 9 psi with 3inch exhaust. i hit full boost at 3.1k rpm. stock wastegate setting on the 14b is 8 psi. go 3 man, youll love it.</TD></TR></TABLE>
Did you start off w/ a 3" ? (point of reference...?) I mean 3100rpm is low.. but not super low....
X2
Did you start off w/ a 3" ? (point of reference...?) I mean 3100rpm is low.. but not super low....
X2
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