f550maranello2

iTrader: (2)

I was bored and decided to put back the stock y pipe on.. i wanted to see how much of a power drop it would have.. i currently have a custom cat back with a maganflow 33 inch resonator and magnaflow muffler...

I i put the stock y pipe back on this afternoon and WOW!!!! it makes the car run 10x better, 0- 40mph is effortless.... NO JOKE all that lost low end power is back i love it the acceleration is a lot smoother and the engine sounds great at WOT.... im very pleased.. honestly i think that that warpspeed y pipe just makes the car run like **** plus it has a loud flex section... im gonna monitor the car through out the week to get a better difference between the two...

zeeman

iTrader: (3)

dont make no sense?!?!?!?!?

f550maranello2

iTrader: (2)

i know it seriously runs awesome....

Nissan 6

Damn thats interesting.

Eyemfaster

iTrader: (2)

hmm, i'm getting a warpspeed y. keep us updated.

ethnic6

iTrader: (5)

wonder if people with a other aftermarket ypipe should do the same tests

ghostmax301

iTrader: (7)

I would say give it a try, because i just got my warpspeed about a week ago with a gutted stock cat, and no muffler and it feels alot less powerful then i thought it would, plus it is somewhat loud....i might switch back just to test my stock and see if i get the same results..

But someone else deffenently needs to try another brand and see if the same happens....that would be weird........



Warpspeed FTL????

willard00

iTrader: (1)

sooo if you decide to keep the stock...how much for the warpspeed!!??

dmBK

iTrader: (3)

try warpspeed (or any other aftermarket y-pipe) and stock muffler. and then stock b-pipe and stock muffler

d00df00d

iTrader: (4)

Something is off. The only thing that the stock Y-pipe has going for it is that it is a roughly equal-length design. It has pre-cats, all sorts of stupid sections where the piping is pinched off, and a nearly 90-degree (!!) merge. The Warpspeed Y-pipe is nothing special, but at least it doesn't have all that crap.

There's got to be something else about the setup that's messing things up.

f550maranello2

iTrader: (2)

i dont know.. before when i had stock exhaust with just the y pipe it was the same... but as soon as id put the stock y pipe back on with the custom exhaust it made all the difference.. its weird..

Flava_24/7

iTrader: (46)

Well, the gutted cat will actually hurt your performance. A gutted cat doesnt flow like a straight pipe but instead allows the exhaust gases to build up and actually slow the flow rate of the exhaust which can result in a loss of low end power.
IF your NA, there is really no need for a straight pipe either.
If your going to run with no muffler, why even have a gutted cat?
Also if your running a gutted cat, with no muffler did you honestly expect it to be quite?

MaximaSE96

iTrader: (8)

also ...NA applications need a certain amount of back pressure...so lack of muffler could actually be hurting too

ghostmax301

iTrader: (7)

Thanks for the info flava. I guess i took an "L" o well guess i go turbo!!!

ghostmax301

iTrader: (7)

well i had a SUPER restrictive mieneke muffler. You could HEAR the air blowing through it. Guess ill go grab me a stocker for the time being. Guess ill be the 1st N/A in the 12's with only exhaust work lol

j/p

99grnmaxgxe

iTrader: (11)

I'm guessing you have an auto?

NmexMAX

iTrader: (22)

Now there's going to be a sudden market for stock y-pipes. I'm taking mine off after work!!!!!11

mzmtg

iTrader: (11)

False false false false.

http://www.sportcompactcarweb.com/te...ems/index.html

d00df00d

iTrader: (4)

They don't need back pressure. They just have to have an exhaust system that is not too big and doesn't have too many diameter changes so that the exhaust stream can maintain momentum.


EDIT: And what mzmtg just posted.

pimpsmatt

iTrader: (1)

backpressure is always bad, but how can too large of diameter exhaust pipes hurt? im very intrested too see if other people get the same results as f550maranello2

d00df00d

iTrader: (4)

If you have an appropriately small diameter, the exhaust stream will stay hot and keep moving quickly. That means it will have more momentum, which will actually create suction that helps evacuate exhaust gas from the cylinders and increase efficiency and torque.

You will not have that benefit if your exhaust is too big because the exhaust gas will expand and cool and the stream will move more slowly, and thus it will not have any momentum.

MaximaSE96

iTrader: (8)

whatever....but doesnt lack of piping cause a loss of torque....like i have heard stories of an NA car runngin open headers performing like crap....then with full exhaust runnign better...which brings me to antoher question....what is the appropriatelty sized piping.....what would be best for a lighty modded NA application....is 2.5 too big....would 2.25" be to small

mzmtg

iTrader: (11)

A lack of piping will eliminate the scavanging effect of the moving exahust stream. This decreases volumetric efficiency, hurting power.

2.5" is the best size for a 3.0 liter NA motor.

d00df00d

iTrader: (4)

A NA car with open headers would lose low-end torque because the exhaust stream is smaller, which means it has less mass, which means it has less momentum.

2.25" should be fine unless you're making a good amount of power. 2.5" would be okay for anything under ~350 bhp NA.


EDIT: Damn, beaten to it again by mzmtg...

VIP Maxima

i absolutly cant stand the way the WSP y sounds. it feels like its about to explode past 4500 rpm.....

NmexMAX

iTrader: (22)

D00d , he you by 42 minutes.... the latest posts > d00df00d



Unequal piece of **** crap... I miss my Stillen 1st gen y....

MadMaxSE-L

iTrader: (4)

does the Budget Y-pipe sound like this???

Flava_24/7

iTrader: (46)

My budget Y pipe sounds fine.

arrrghhh

iTrader: (2)

i'm about to get a cattman y-pipe, i hope it's better than these horrible warpspeed stories...

d00df00d

iTrader: (4)

That's what I get for .org'ing at work. I hit the reply button and then have to minimize the window, and it's a damn hour before I can get back to it and finish typing.

d00df00d

iTrader: (4)

Oh boy, is it ever. You'll see.

njmaxseltd

iTrader: (19)

It's not back pressure :bandhead: It's velocity and the flow of gasses evenly through pipes with no turbulance. The last thing you want in an exhaust system is back pressure. You want nice turbulance free flow rates. Large chambers (ie. hollowed cats ect...) don't help hot exhaust gases flow.

happyricefob

iTrader: (7)

wsp y-pipe sux

Maxima-4DSC

iTrader: (1)

your all outta your mind my WSP y is great ive had WSP on all my maximas and it greatly improved performance not killed it. im gonna get dyno number b4 and after if i can find a stock max

arrrghhh

iTrader: (2)

i'm assuming that's good?!?

jxkim

iTrader: (18)

so im lost

i thought the whole point of buying aftermarket was to improve your ride's power, not decrease the power.

so is the y-pipe similar case to the intake, where stock seems to work fine or sometimes even one of the better options?
or is it just the warpseed ypipe that sucks, and switching to oem stock showed the difference?

now im wondering if you should just leave the stock y pipe and get the muff and cat done.

d00df00d

iTrader: (4)

Yes, it is. It's the best thing you can get next to a good set of headers.

Except maybe the original Stillen Y-pipe, which was an equal-length design... But I don't think they make that any more.

No reason to abandon the entirety of common knowledge about aftermarket Y-pipes. This is most likely a special case. Something about the setup, plus the fact that the Warpspeed Y-pipe is sort of a budget item, is making it turn out this way. I have never, ever heard of this happening with anyone else. In every other case I've ever seen, an aftermarket Y-pipe has done nothing but add power.

Flava_24/7

iTrader: (46)

Why do you say that?
Y pipe compared to headers yeilded pretty much the same numbers on an NA 3.0.
For the money and ease of install the Y pipe is the way to go unless your boosted or have a 3.5.

Bobo

Take it up with the boss. I am sure he or she will be symapthetic.

f550maranello2

iTrader: (2)

well that might be because nobody realy puts the stock y pipe back on like me.. fact is that the aftermarket y pipe makes the exhaust sound like crap... you can have a fart can bolted up instead of the stock muffler with the stock y pipe and it wont sound bad... as far as power wise.. the y pipe does seem to rob low end power and it gives it back after 3k rpms.. thats what my results seem to be.. this is the second day and i have been testing the car and thats what the resluts seem to be...