What size exhaust pipeing should I get on my b16a in my 91 hatch?

 

2.5 should be enough

 

i've got 2.25 on my b16 and it seems fine. don't go too big unless you are FI.
later
Matt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by insomniac791 &raquo;</TD></TR><TR><TD CLASS="quote">i've got 2.25 on my b16 and it seems fine. don't go too big unless you are FI.
later
Matt</TD></TR></TABLE>

N/A motors need a certain amount of back-pressure. 2.25'' is a good size.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91rexinva &raquo;</TD></TR><TR><TD CLASS="quote"> N/A motors need a certain amount of back-pressure. </TD></TR></TABLE>

Thank you for spreading misinformation

I also recommend 2.25" but it's for reasons of OVERALL FLOW VELOCITY and PREVENTING FLOW STAGNATION, not the ghey over-used reason of 'backpressure'.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by raene &raquo;</TD></TR><TR><TD CLASS="quote">

Thank you for spreading misinformation

I also recommend 2.25" but it's for reasons of OVERALL FLOW VELOCITY and PREVENTING FLOW STAGNATION, not the ghey over-used reason of 'backpressure'. </TD></TR></TABLE>

Fine, backpressure is not a good term. But maintaining pressure in your exhaust is what keeps flow velocity up and gasses moving through the system. The reason N/A motors need a smaller exhaust diameter is because the engine doesn't expell gasses with as much force as a FI setup does, for obvious reasons.

Whatever though. I wouldn't call my post misinformation, maybe just a poor explanation of the overall point. But I do agree, backpressure isn't a very good term. to me for using it.

 

Read my sig

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91rexinva &raquo;</TD></TR><TR><TD CLASS="quote">
But maintaining pressure in your exhaust is what keeps flow velocity up and gasses moving through the system. The reason N/A motors need a smaller exhaust diameter is because the engine doesn't expell gasses with as much force as a FI setup does, for obvious reasons.</TD></TR></TABLE>

Pressure is still just as bad... it's a side effect of keeping the flow velocity up, not something you want to maintain. And the only reason you want flow velocity is to get the scavenging effects of the low-pressure zones between the exhaust pulses to help suck the next pulse out. F/I cars need less backpressure for different reasons; it has nothing to do with the force with which they expel gasses. The reason being, boost is created by the pressure differential between the exhaust inlet and the exhaust outlet on the turbo. Avoiding turbulence and keeping low backpressure is the name of the game for turbo cars.

I see what you're saying though And you've got it right. I just want to keep terminology clear for anyone else reading this who may be confused by the terms you're using. Not saying you're wrong, just that it could be more clearly stated.

I love this explanation

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by raene &raquo;</TD></TR><TR><TD CLASS="quote">
I see what you're saying though And you've got it right. I just want to keep terminology clear for anyone else reading this who may be confused by the terms you're using. Not saying you're wrong, just that it could be more clearly stated.
</TD></TR></TABLE>

Good link. I probably shouldn't have opened my mouth about it in the first place, which was I believe your initial point. But now I know, and knowing is half the battle.