is a test pipe good for N/A/ cars?
or, are they preferably for turbo cars?

 

crack pipe, pvc pipe, half pipe... give us something to go off of here...

 

a test pipe is basically a pipe that replaces your catalistic converter.
basically a straight thru pipe...


heres a pic...

 

n/a cars never benifit from that. A boosted car a little bit more. But if anything just get a high flow cat.

 

but , i dont know if i trust your knowlege. haha.
hell, ya didnt even know what a test pipe is. lol

 

NA cars need backpressure, get a 2.5in exhaust with a highflow cat.


Turbo cars need as little backpressure as possible, sop unless u got a big turbo get a highslow catlytic converter.

 

If you have a stock cat, you will benefit hoursepower wise. The cat on a dseries flange has a bottle neck of like 1.5'' or something like that!

However, it makes a ugly (IMO) and loud sound, I'd replace it with a hi-flow cat, some flow almost as well as test pipes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hondaciv95VX &raquo;</TD></TR><TR><TD CLASS="quote">NA cars need backpressure, get a 2.5in exhaust with a highflow cat.


Turbo cars need as little backpressure as possible, sop unless u got a big turbo get a highslow catlytic converter.</TD></TR></TABLE>


True, NA car needs backpressure AKA exhaust velocity, but a highflow cat will not increase exhaust velocity no more then a test pipe. If the test pipe and high flow cat where the same size inner diameter, the test pipe would give you better exhaust velocity then the cat would. The cat will create a restriction or turbulence due it's filtering elements and whatever else is in it.

 

hummsss.....
so basically keep my oem cat..
or is this debatable? lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Br1anPham &raquo;</TD></TR><TR><TD CLASS="quote">If you have a stock cat, you will benefit hoursepower wise. The cat on a dseries flange has a bottle neck of like 1.5'' or something like that!

However, it makes a ugly (IMO) and loud sound, I'd replace it with a hi-flow cat, some flow almost as well as test pipes.</TD></TR></TABLE>

What i mean to say is that if you have a stock cat with a 1.5'' bottle nect, you WILL benefit with a high flow cat or test pipe.

 

my exaust is OEM al around, execpt for my fart pipe.
i found a used test pipe for 15 bucks. im building a z6 n/a oem beast pretty soon.
my build will be...
z6 block+head
d16a1 crank+pistons+rods
as far as i know of , ill be the 1st person to put a a1 crank in a z6 block.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by graveltravel2 &raquo;</TD></TR><TR><TD CLASS="quote">
as far as i know of , ill be the 1st person to put a a1 crank in a z6 block.</TD></TR></TABLE>

what's the difference in the two? i doubt it would really matter.... jw I'm a dohc guy and don't know these things

 

actually i dont know what the difference is, beside some a1 cranks at the end of them is smaller in diameter than , say a z6 crank.
ive also been told that all d16 cranks are the same.
but , ive been told so much b.s. on here it isnt even funny.

 

d16z6 beast eh?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by graveltravel2 &raquo;</TD></TR><TR><TD CLASS="quote">actually i dont know what the difference is, beside some a1 cranks at the end of them is smaller in diameter than , say a z6 crank.
ive also been told that all d16 cranks are the same.
but , ive been told so much b.s. on here it isnt even funny.</TD></TR></TABLE>

ahh i see....i thought all d16 cranks were the same also, but i thought i heard somewhere one specific d16 model crank had holes in it so it had less resistance or something but i have no clue which engine it came out of or it was stock or hell i could be completely wrong, i was just wondering if this was the one or not

 

are you talking about the holes where the rod bearings attach on the crank?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by graveltravel2 &raquo;</TD></TR><TR><TD CLASS="quote">are you talking about the holes where the rod bearings attach on the crank?</TD></TR></TABLE>
nah...well i don't think so at least. i'm talking about liek through the crank like aerodynamic holes lol idk man i need a picture i can't descibe it

 

most cars will benifit taking out the cat or even "cleaning out" the cat. i have heard fords will have problems but thats becuase of the stupid computer systems in it. but my friends car integra when he put is 3" exhaust in his car with test pipe his top speed went up about ten miles. so hell it will help you out there. you might notice higher hp at higher revs and lower tq at lower revs like what headers will do for you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by salesmonkey &raquo;</TD></TR><TR><TD CLASS="quote"> but my friends car integra when he put is 3" exhaust in his car with test pipe his top speed went up about ten miles. so hell it will help you out there. you might notice higher hp at higher revs and lower tq at lower revs like what headers will do for you.</TD></TR></TABLE>

3" exhaust?? I hope he had a nice turbo setup because that wont help an N/A D series motor. I say stick with the cat unless you have F/I. Dont pollute the planet more than we have to.

 

my straight pipe gave me HP, and its dyno proven

https://honda-tech.com/zerothread?id=1499346

 

backpressure is good for standard motors and low down torque.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VALET dude &raquo;</TD></TR><TR><TD CLASS="quote">my straight pipe gave me HP, and its dyno proven

https://honda-tech.com/zerothread?id=1499346</TD></TR></TABLE>

this is far from standard and he needs freeflow. as little backpressure as needed.

n/a needing backpressure is misunderstood if you want anything top end(if you want some power). you just have to consider the right diameter. with the right diameter you actually don't want anything that obstructs your flow. why do cars in dragraces (NA) race with open headers. i'm not talking pro but somewhere in the 200whp range. not cause they don't know **** and should actually run stock exhaust with cat cause there precious NA engine needs backpressure. so it's all about the question where you want to make power and how much. if you don't have to run a cat, why should you, if you have to, run a highflowcat. just make sure you get the right diameter exhaust when you are going freeflow.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teknoracing &raquo;</TD></TR><TR><TD CLASS="quote">
3" exhaust?? I hope he had a nice turbo setup because that wont help an N/A D series motor.
</TD></TR></TABLE>
we're not all running d-series . there some guys who benefit from running 3" NA freeflow . talking 250whp figures tough . and if you have a serious turbo setup 4" is not uncommon

 

Please tell me who is running 250HP N/A without nitrous on a honda block. not picking a fight just asking a question.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teknoracing &raquo;</TD></TR><TR><TD CLASS="quote">Please tell me who is running 250HP N/A without nitrous on a honda block. not picking a fight just asking a question.</TD></TR></TABLE>
numerous people, for one tbone is running 268whp (whp is with the 15%drivetrainloss taken of) and that means 308 hp at the crank. NA B-series
nowadays K-series is coming up, and there 240whp is doable with stock bottomend, no porting and some good tuning. 240whp meaning 276 hp at the crank!
so if you're talking crank hp (250*0.85=whp=212.5whp) there a lot of guys running that figures on bolton,stock bottomend 1.8's, they ussualy run 2.5 inch (sometimes still benefits from 3"). i'm talkin about some guys who actually run 250+whp and almost will have to run 3" exhaust.
go look in the NA forum up here and find a lot of guys running 215+whp and some 250+whp

 

My bros hyundai give more horseys with a test pipe then high flow cat. He just throws the cat back on for a inspection time. So there is an increase in hp with test pipe

 

Help me! im running a D and i need exhaust help, i think ive got a too big back box, 1.5 LSI and i have had a mugen 4-2-1 manifold and straight through hi flow cat fitted, i tore a slash in the cat where there was not enough pressure escaping out the backbox so i replaced the cat with a new high flow one and then changed backbox with a mugen style twinloop back box (Love the sound) which has a 4" oulet, i think it feels slower now then it did with the standard backbox, appart from when im raggin the s**t out of it, and it drinks petrol like its a 2.0 litre.i reset my ECU when i had the full system fitted and cleaned my K&N. Have i got a too big backbox because of the twin loop and only a 1.5 ??? do i not have enough compression?