My Catback/muffler, Soon to be... Options

[DalwinCo]

hmm. i just read all this crap and somehow i feel a little stupider then i did before.

stevenwang reminds me alot of a_firey_accent. boy i hate that guy lol

Wow. You did not just go there like Degrassi does. LOL.

[JohnIrvine1]

I swear i saw a supra that looked exactly like this one in worcester, ma. Black with black rims and also a huge spoiler, crazy how people think that looks good

[ausom accent 9]

I swear i saw a supra that looked exactly like this one in worcester, ma. Black with black rims and also a huge spoiler, crazy how people think that looks good

Wow ! I think if you saw it...you would remember (IMG:style_emoticons/default/grin.gif)

[Papule]

This is wrong. The bigger the exhaust the faster the turbo spools, to a point (that point is much larger than 2.5) The smaller the exhaust the greater the backpressure. You want the best airflow to spool the turbo the fastest and most efficiently. Backpressure and smaller exhausts prevent maximum airflow. Maybe Damien (guy with the turbo I assume you are talking about) has a 2.5 out, but that doesn't mean that it's ideal or is right.

This is correct. Why did you say he was wrong Stevenwang?

Steven, if you knew your turbos...well...nevermind...there's no point. Just read the above statement for turbo basics. It seems like Natish knows more than you do, even though he put a 4.5" exhaust on his car.

BTW, who are you calling a kid ? Aren't you a kid yourself? You have to be a college or high school kid...

[StevenWang]

............. smaller manifold, smaller downpipe, relatively non-huge exhaust / de cat cause ur turbo to spool much faster. 4.5 too big. 2.5 big enough for our cars up to prolly 300hp. running at up to 15 or more psi. ive worked on turbo cars, and been around them all my life. with a huge exhaust, like natishs' it wont spool idealy. why does everyone argue? u need back pressure, in all aplications. if turbo spools off the exhaust. if exhaust gases arent moving at a high enough pace... it wont spool. trust me. open ur mouth as wide as possible. blow it all out. see how much air passed out in such a short amount of time?? it wasnt moving fast at all. now, close the gap. the air is moving at a faster pace. i really dunno if i can keep coming on this forum. people are sooo uneducated about exhausts and turbos its hillarious. get damien or w/e on here. ask him why he has a 2.5 inch exhaust and not 3 inch. please stop this thread honestly.

[ultragod]

u need back pressure, in all aplications.

So, an exhaust will be better, in all applications, that having nothing at all, since no backpressure can be created?

[dAMIAn78]

get damien or w/e on here. ask him why he has a 2.5 inch exhaust and not 3 inch. please stop this thread honestly.

The turbo I'm running is considered small compared to some of the stuff I've seen on hondas in the shop that did the fabrication. The outlet on my turbo is 2.5", so it was a safe bet to not make it smaller than that, and 3" would be a tad overkill for my application (boost and power levels).

The stock exhaust is very restrictive on these cars so even a 2" cat back type system should help get some more power out of the car. There were things I was advised not to do while getting the turbo kit together. A lot of it had to do with spending money twice on the same stuff..There are a lot of replies so I might no be clear, but I think it's been mentioned that they will have a 2" exhaust made with crushed bends that will be replaced in 8 months with a mandrel bent 2.5" system to support a turbo setup..

My advice is save the cash now and go with the right stuff the first time. Example, don't buy a header and have an exhaust made now so in 8 months you have to have a manifold made and exhaust made for a turbo setup. :2ct:

[Papule]

............. smaller manifold, smaller downpipe, relatively non-huge exhaust / de cat cause ur turbo to spool much faster. 4.5 too big. 2.5 big enough for our cars up to prolly 300hp. running at up to 15 or more psi. ive worked on turbo cars, and been around them all my life. with a huge exhaust, like natishs' it wont spool idealy. why does everyone argue? u need back pressure, in all aplications. if turbo spools off the exhaust. if exhaust gases arent moving at a high enough pace... it wont spool. trust me. open ur mouth as wide as possible. blow it all out. see how much air passed out in such a short amount of time?? it wasnt moving fast at all. now, close the gap. the air is moving at a faster pace. i really dunno if i can keep coming on this forum. people are sooo uneducated about exhausts and turbos its hillarious. get damien or w/e on here. ask him why he has a 2.5 inch exhaust and not 3 inch. please stop this thread honestly.

Why does everyone argue? Maybe because you are wrong? Steven, I'm not trying to be rude or anything, but you come off like you know everything, when you obviously don't. Since you are the type to think that they are always right, I'm done with this thread too. Bottom line, you want the least amount of backpressure on turbo applications....PERIOD. Good luck with your future endeavors.

[StevenWang]

exactly. LEAST amount, but not overdoing it. You STILL need some back pressure. It's called constant movement of air. To big of an exhaust, it wont be constant, and will cause your turbo to spool insufficiently. How does this not make sense? I gave a perfect example. If this isn't the case sir, why dosen't Nitish's exhaust give him a much, MUCH faster spool? Why? You are wrong. You still need back pressure or it causes issues... I don't act like I know everything. I'm going to school for this, and whats fact, is fact. Most people are misinformed about this issue. You can't just have a giant exhaust with a T3/T4 turbo... It will do absolutely nothing.

This post has been edited by rondy_: Nov 11 2009, 12:37 AM

[ultragod]

open ur mouth as wide as possible. blow it all out. see how much air passed out in such a short amount of time?? it wasnt moving fast at all. now, close the gap. the air is moving at a faster pace

This seems wrong to me as well. Well, the analogy at least. Maybe a better analogy is to purse your lips and blow air through a straw, and through a rolled up piece of paper, since your mouth would represent the turbo and the straw/paper :the exhaust. But in this case, more air is moving through the larger pipe, and the only restriction is your lips (the turbo outlet), there is nothing holding back maximum exhaust flow, unlike the straw which restricts airflow. Furthermore, no difference would be felt blowing through a rolled up piece of paper, and a giant rolled up piece of paper. Why wouldn't a person want maximum airflow after the exhaust has already done it's job (spooling the turbo)? The airflow after the turbo bottleneck shouldn't have an effect on turbo operation unless the air flows backwards, which it doesn't, right?

Anyway, the turbo outlet is going to be the same size, regardless of the exhaust size. Damien's turbo's outlet was 2.5 so even if he had a 3 feet wide exhaust, the outlet would still be 2.5" since it would then be a bottleneck, correct?

So I know the pulse of the exhaust gas creates a vacuum between pulses, but the turbo in the way of the exhaust greatly diminishes these pulses, so low-end torque should be affected regardless because the car can't utilize the scavenging effect, right? So how does having a really large exhaust on a turboed car lose more low-end than a "proper" exhaust?

Don't get all hot and bothered, I don't know the answers to these questions, that's why I'm asking.

[StevenWang]

http://www.cobbtuning.com/info/?ID=3222

best thing i can help u with.

im not mad, i just get annoyed when noone listens. sorry maybe my analogy wasnt the best, but i thought it got my point across. that article sums it up. theyre pretty known, cobb tuning.

you will always have backpressure... its not always bad. if you dont have backpressure, ur exhaust is to big and ineffective. thats what ive been meaning to say... with boost comes back pressure.

This post has been edited by StevenWang: Nov 10 2009, 03:30 PM