For those NA guys with 3" exhaust

[9240sx]

http://www.team-integra.net/se...ID=47

Found this artical,Thought it made alot of sense...

[AmoebAssassin]

That article has no basis in any sort of intelligent science, and I hope whoever wrote that gets slapped in the face in the near future.

[daconkiftador]

^^

[TrunkMonkey]

my 3g eclipse's stock exhaust system is roughly 2-2.25".

it's restrictive as hell.

-demetrius

[redtop91]

I don't see what the fuss is. N/A w/ 3 inch exhaust is pointless. Sometimes even harmful. Do not do.

[JustinStrife]

I don't see what the fuss is. N/A w/ 3 inch exhaust is pointless. Sometimes even harmful. Do not do.

You're right. Just like swapping other motors in our cars is harmful too.

A 3" full exhaust WILL net you more power than a 2.5" exhaust, at least on an engine with ANY kind of displacement like the KA motor. It won't be much, but the only negative it gives, is more noise. In which case a turbo fixes that nicely.

[redtop91]

If an exhausts diameter is too large for the pulses the motor is putting out it will increase escape volume but dramatically decrease velocity. It is not too hard to grasp.

Edit: Maybe for some it is

[BadMojo]

If an exhausts diameter is too large for the pulses the motor is putting out it will increase escape volume but dramatically decrease velocity. It is not too hard to grasp.

Edit: Maybe for some it is

I've never seen a dyno graph on a NA KA showing that a 3" exhaust is big enough to decrease the velocity of exhaust gas to the point where scavenging is effected and power is lost.

Dunno...I was a history major in college. Either they didn't teach us fluid dynamics or I was sleeping in that day. Still, I've never seen a dyno show that 3" exhaust will cause any problems on a KA, and I've never seen anyone complain about noticeable loss of power at any RPM's.

[redtop91]

I definitely misspoke. 3 inch won't do any damage. I'm thinking of another thread where a guy was talking about a 4 inch exhaust.

[nametakennow]

Having too big of an exhaust is more a pointless nuisance than some dramatic harm.

Furthermore, if the primaries on the header are still the same size, then the size of the exhaust piping is pretty much moot. Having giant primaries and/or having no header would destroy the scavenging effect, but having giant piping after that point is merely silly.

[SeVa-S13]

Man I haven't seen that "article" in a while, always good for a chuckle...

[sicride]

just like 4-1 headers vs. 4-2-1 headers. I see a 3" exhaust hurting low end torque and improving top end hp. But both only being minimal so go for the sound you desire.

[RB20DETodd]

I don't see what the fuss is. N/A w/ 3 inch exhaust is pointless. Sometimes even harmful. Do not do.

there excuse is

Ho one day i stay turbo, but for now ill annoy the hell out of everyone and look like a ricer.

[alms24sebring]

its true, bigger is not always better, theres a limit.

[redtop91]

^^

[ddgsxr504]

While this discussion has been beat to death....

NA/KA motors have shown no loss using 3inch over 2.5inch on dynos.

KA's have more displacement than the Honda motors the author is clearly refrencing which negates the whole theory behind his entire article.

Most of us go with 3 inch because we plan on going turbo later, how many 1.6/1.8 litre Honda guys can say that, no use in buying 2 exhausts.

[RB20DETodd]

Most of us go with 3 inch because we plan on going turbo later

OH

SNAP!

[E7-S14]

I got a 3 inch exhaust and i love it... i dont feel any loss in power either and this guy is most likly refrencing to a Honda motor.. and not KA.. It makes sense.. but its fact that all motors arnt created equally

[redtop91]

Right. NA Honda motors > NA KA

OMG Seva has spoken!

[SeVa-S13]

Right. stock N/A Honda motors > pretty much any stock NA 4 banger sold in america

(and stop with the whole slash thing, it's not "Naturally/Aspirated" )

[JustinStrife]

I definitely misspoke. 3 inch won't do any damage. I'm thinking of another thread where a guy was talking about a 4 inch exhaust.

Glad we got that straightened out.

I've owned 3 240sx's, 2 have had BRM, and one has had an HKS Hi-Power. I've also run the KAE, KADE, and the SR20. I think I know a little bit of what I'm talking about.

[redtop91]

I think I know a little bit of what I'm talking about.

LOL maybe just a little.

[Red coupe]

You can indefinitely go to big, and Im sure all this theory comes into play but.....Reality is more important....I haven't looked into much but in most cases don't dynos show gains with 3"? Dyno > 1 page article on the basics of exhaust theory.

[R6_240sx]

I definitely misspoke. 3 inch won't do any damage. I'm thinking of another thread where a guy was talking about a 4 inch exhaust.

Pics of the 4 inch... exhaust, or

[Looneybomber]

The F20c is only 2.0L, but the s2k guys swear by the 70mm (2.76") single as opposed to the 63mm (2.48") single. No need for 3" on that car, there's not enough displacement to need it.

[scotttak]

i would think the 2.75 is better for the s2k is because it hits its power high in the rpms so thats what they go for, more top end.

[AmoebAssassin]

Oh my god, are we still arguing about this?

Please, please, please, do not give in to random internet speculation! Go with what works, and 3" definitely works on a KA.

[ddgsxr504]

Oh my god, are we still arguing about this?

Please, please, please, do not give in to random internet speculation! Go with what works, and 3" definitely works on a KA.

What... WWHHAAATTTT!!!!

True True.

[thekage]

This is called valve overlap and is necessary for high revving engines such as Integras

last time I checked I didn't drive an integra or a high revving engine. The KA is definitely neither of those things.

[ddgsxr504]

it's douche not doush but either way touche'!