I'm getting a new exhaust tomorrow and wanted everyone's opinion. I have a basically stock H22 in my 92 hatch. Wondering if 3 in. exhaust is overkill? I will be running NO cat and no resonators. Going to be going turbo down the line, don't want to have to get 2 different exhausts.

 

Why not just get the turbo first, then the exhaust.

 

if youre goiing turbo def get the 3in..

i dont think its really overkill its only .62 inches bigger than a run of the mill 60 mm exhaust for now you'll be fine

 

I need an exhaust now. Can't get turbo for another month or so.

 

Isn't a rule of thumb that larger than 2.5in for NA is not beneficial? The backpressure helps draw out the exhaust gases...

 

its giong to sound like **** until you install the turbo too.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vinuneuro &raquo;</TD></TR><TR><TD CLASS="quote"> Isn't a rule of thumb that larger than 2.5in for NA is not beneficial? The backpressure helps draw out the exhaust gases...</TD></TR></TABLE>

It's not backpressure that helps draw out the exhaust gasses. It's vacuum from the velocity of the gas.

If you have bigger than 2.5", to move the same amount of air in a bigger pipe, the VELOCITY of the exhaust gasses are slower, hence loss in horsepower.

If you have it too small, it becomes a restriction, hence loss in horsepower.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by All-Motor H22A &raquo;</TD></TR><TR><TD CLASS="quote">

It's not backpressure that helps draw out the exhaust gasses. It's vacuum from the velocity of the gas.

If you have bigger than 2.5", to move the same amount of air in a bigger pipe, the VELOCITY of the exhaust gasses are slower, hence loss in horsepower.

If you have it too small, it becomes a restriction, hence loss in horsepower.


</TD></TR></TABLE>

i'd wait until you get the turbo. you're going to hate the loss in horsepower if you get the 3in now.

 

^^^

 

If you gonna turbo it next month than go ahead with the 3"

 

I have 3" exhaust on my dc2 that i swaped in a jdm h22a. car was previously turbo'ed so thats why it has 3" exahust

Its sounds fine and runs great. Ive got a 24" resonator and a megaflow muffler, no cat. It is pretty loud sence its 3" but i added a silencer to the muffler and it quited it down quite a bit. its sounds good and has a nice deep tone down low... alomst like apexi n1 up top when you step on it.

On the h22 you wont loose As much low end with the 3" then say a b16 would from what ive read

 

do all of you bandwagon ***** have evidence for your claims?? <FONT SIZE="3"><u>no</u></FONT>

if one of you can scrounge up a dyno sheet proving that a 3 inch will lose hp on an h22 vs a 2.38 or 2.5 i will put a carbon fiber neon wing on my prelude and inject nosz

besides, the way most of you read dyno sheets consists of the peak numbers, and a 3 inch would definitely make higher peak numbers than a 2.5 or smaller, the only compromise may be in the midrange, but this would be better seen in a smaller motor...

 

My source: https://honda-tech.com/zerothread?id=180883 : exhaust section. Calm down.

 

It seems like most have different views on the 2.5 and 3 in. exhaust. I know that either way I go, it will be loud as expletive with no cat, no resonators and no silencers.

 

dude....forget those chumps...if you are "planning" on boostin soon then go ahead with the 3 inch. There is no reason to work backwards.....common sense. Everyone is not born with a 10000 dollars to just drop on engine mods so if you have to build it piece by piece by all means do so.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by toe-jo &raquo;</TD></TR><TR><TD CLASS="quote">dude....forget those chumps...if you are "planning" on boostin soon then go ahead with the 3 inch. There is no reason to work backwards.....common sense. Everyone is not born with a 10000 dollars to just drop on engine mods so if you have to build it piece by piece by all means do so. </TD></TR></TABLE>

 

Thats what I want to hear. Thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">do all of you bandwagon ***** have evidence for your claims?? <FONT SIZE="3"><u>no</u></FONT>

if one of you can scrounge up a dyno sheet proving that a 3 inch will lose hp on an h22 vs a 2.38 or 2.5 i will put a carbon fiber neon wing on my prelude and inject nosz</TD></TR></TABLE>

Exhaust flow. That's what it comes down to. If the exhaust flows too fast, you lose horse. If it doesn't flow fast enough, you lose horse. I guess if it doesn't matter when you put a 3 inch on a 150whp car, it won't matter putting a 2.5 on a 400whp car....that's just stupid.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by toe-jo &raquo;</TD></TR><TR><TD CLASS="quote">dude....forget those chumps...if you are "planning" on boostin soon then go ahead with the 3 inch. There is no reason to work backwards.....common sense. Everyone is not born with a 10000 dollars to just drop on engine mods so if you have to build it piece by piece by all means do so. </TD></TR></TABLE>


yea man i said that about two posts into this thread... i dont know why this has spawned a huge debate

let me spell it out for all the dumbasses.....if hes going turbo..even in a year it still makes more sense to buy one exhaust in a year than two since these things dont exactly grow on trees<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1GPlusSH &raquo;</TD></TR><TR><TD CLASS="quote">

i'd wait until you get the turbo. you're going to hate the loss in horsepower if you get the 3in now.</TD></TR></TABLE>

for all the performance professionals out there id be really uncomforable with that slight loss in horsepower to save myself hours of time and hundreds of dollars...maybe you'd feel more comfortable if you stuck a 2.5 inch pipe up your ***

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1GPlusSH &raquo;</TD></TR><TR><TD CLASS="quote">

Exhaust flow. That's what it comes down to. If the exhaust flows too fast, you lose horse. If it doesn't flow fast enough, you lose horse. I guess if it doesn't matter when you put a 3 inch on a 150whp car, it won't matter putting a 2.5 on a 400whp car....that's just stupid.</TD></TR></TABLE>

thank you sir captain obvious of the butthole avenger force.....you, my friend, arrrr plain stupid, but i take it you have a basic understanding of **** talking

lik a sac de *****

thumbdown my post? where is your evidence? you show me that 2.5 is appropriate size piping to match the airflow of an h22 with mods comparable to yours, that sir c.o is what i stated, i did NOT say anything about general flow theory, but i do thank you for that introduction to things, i loved it

 

If you get too big of an exhaust, you don't get the vacuum affect that you need. 3.0 in exhaust is WAY TOO big for a stock h22. When it gets turboed, 3.0 will be great, but he WILL lose horse until it's turboed. There's no reasonable ground you can argue against that.

Show me a dyno where someone didn't lose horse.

Usually, when people know they're wrong on an argument and they feel they are going to look stupid, they start belittling.....

 

how about you show me a dyno where someone DID lose horse....you have no scientific evidence that i am wrong, and if you do, you have yet to show it...

 

Yea go with a 3inch for now, but man for your sake i say shove at least one long resonator in there. I have a 3inch on my k20R hatchback no problems. Making torque out the *** and whp like ****. No loss, if anyone wants to see a dyno.

 

prove it does...

no prove it doesn't...

this is going no where.


the op doesn't even seem to care about hp loss. He cares more about not wasting money on an exhaust that won't work well when he's turbo.

 

Well regardless, i have less displacement and it didnt seem to hurt me. I still pulled great numbers. And most k20 race cars are running 3 inch exhaust. Ask Dan Phan Of R crew racing, hes making 235whp and 160tq on a k20R motor'd hatch and 3inch exhaust, along with their custom header.