supersickss

Can anyone explain why this is ? i always kinda knew that ,but it realy hit me tonight, i closed the cut-out ,and ended up getting a good 3 second chirp into second gear at 50 mph in an all stock A4, were as with the cut-out open it doesnt quite chirp for me

c0ncEpT

iTrader: (4)

My car is so loud at 6K I wouldn't be able to tell if the tires made a sound anyways. But I really haven't noticed any difference with the cutout open vs. closed TQ wise

SMALLBLOCKHERO

iTrader: (2)

i got rid of my cut out and put on a new TSP rumbler cat back and picked up a tenth in the 1/4. so who knows.

BlackScreaminMachine

iTrader: (17)

to prove your theroy you need to lock the converter and dyno the car.

SS101

iTrader: (2)

the lack of back pressure at lower rpms usual will cause a drop in torque, nothing to worry about tho in the area of 5rwtq i remember hearing...the difference is generally made up in the higher rpms when the increased horsepower, also caused by the lack of backpressure, comes into play.

sk8co

... loss of low end torque?? if your at 6k rps shifting im pretty sure that top end.......

LSGunZ28

iTrader: (8)

Yes it makes sense at low RPMs your torque will not be as much as with a longer route. But its always better at High RPMS/PEak HP

Hennytime

iTrader: (33)

mine feels more than a loss of 5rwtq <3000rpms, but the top end screams. but then again it doesnt take long to flash up

ONEBADWS6

iTrader: (22)

My street car feels faster with the cut out closed but E.T's .2 faster with it open.

SouthFL.02.SS

Your peak torque actually increases with the loss of "back pressure" with the cutout open. The peak simply moves up higher in the rev range, thus the lethargic feel at low end. Cut out open = more power, faster car overall. yet sluggish feel off the line. You've got to keep the revs up to take advantage of the open cutout.

ChocoTaco369

I gained .2 on my ET with my cutout open. Corsa flows so well, an open cutout becomes more of a flow disruption I definitely feel a significant loss of low end torque and throttle response with it open but the increased noise of LT's into a cutout is worth it. I raced an SRT10 pickup tonight and he told me my car sounded badass. Yea, it may not have a much of a tone quality to it, but it sounds mean as hell.

TwistedSS

iTrader: (3)

My car made 8 more hp and 4 more torque with the cutout open, but mine has about a foot long section of pipe with a turndown on the end of it.

Mike00ss

iTrader: (9)

My car also picked up 6 more hp and 5 more torque on a dynojet. I have never brought the car to a track yet for those result, but I feel like the motor also revs up quicker.

socmguy

iTrader: (18)

my car made 7 more hp and tq throughout the entire dyno sheet which started at 3k

cutout = faster

3rdgentug

iTrader: (23)

i picked up .2 w/ a cutout

supersickss

wow maybe im being to paranoid

CRAGER

cutout= loss of low end torque = myth

twizted_creations

iTrader: (4)

Even if it did make you feel sluggish of the line, wouldnt that be a good thing since traction seems to be an issue anyway? Just my 2 cents.

Jeremiah

iTrader: (5)

My 570 RWHP 01 SS gained 1 rwhp and lost 4 rwtq, with a 3" cut out over the close Hooker cat back. I sounded like a POS farm truck also with the cut out.

It was also a QTP and fell appart within a few months of weekend/pleasure driving only.

BlackScreaminMachine

iTrader: (17)

Thankyou! Thats been my point exactly.

SOTP = Seat of the Pants is NOT a dyno. And does not subistute for a 1/4 track.