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Old 06-26-2006, 06:29 PM   #1
Keif
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Default Why does my car feel faster with the stock cat-back

So the other day i pulled off my cat-back to check for a leak and i decided to throw on my stock cat-back to see how it was suprisingly i dont know if its in my head but if feels faster, alot more responsive, the power starts to drop off at about 6k ish, am i a crack head or what?
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Old 06-26-2006, 06:35 PM   #2
prspect06
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Placebo.

It's probably the lack of volume from the stock catback that is messing with you.
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Old 06-26-2006, 07:01 PM   #3
05wrxblowths
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i did the same thing and it feels faster but it's really not. it's bc you dont have all that noise coming out your a@@. it's a little slower but to me it's worth it. more or a sleeper now bc people will look at your car and think it's stock. then they get a slap in the face when the light turns green.
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Old 06-26-2006, 07:03 PM   #4
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Quote:
Originally Posted by prspect06
Placebo.

It's probably the lack of volume from the stock catback that is messing with you.

Except that placebo should make his car feel slower if anything.


did you reset the ECU?
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Old 06-26-2006, 07:39 PM   #5
Keif
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no i did not reset the ECU, i was thinking it was the noise too but i dont know it just seemed to through me back in my seat more
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Old 06-26-2006, 07:43 PM   #6
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it might be adding like 1 ft/lb of torque due to the more restrictive piping but i highly doutb it lol....
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Old 06-26-2006, 08:11 PM   #7
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the increase in backpressure likely makes the car more responsive, but all out peak power has dropped.
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Old 06-26-2006, 08:54 PM   #8
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The increase in backpressure produces more low end tq. This is why your car feels faster. Run it to redline, and you will feel the lose.
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Old 06-27-2006, 12:13 AM   #9
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Quote:
Originally Posted by keithwrx8
So the other day i pulled off my cat-back to check for a leak and i decided to throw on my stock cat-back to see how it was suprisingly i dont know if its in my head but if feels faster, alot more responsive, the power starts to drop off at about 6k ish, am i a crack head or what?
stock turbo?
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Old 06-27-2006, 12:19 AM   #10
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stock turbo
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Old 06-27-2006, 12:30 AM   #11
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I noticed the same thing when i put my stock AB on after having a full 3" TBE. I've since replaced it with an STI AB. Much better drivabilty with the factory mufflers while sacrificing a tiny bit of power up top. The low end seems more responsive. The lack of noise and stealth factor is nice too.
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Old 06-27-2006, 12:33 AM   #12
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Quote:
Originally Posted by MF-DIF
The increase in backpressure produces more low end tq. This is why your car feels faster. Run it to redline, and you will feel the lose.
winnAr
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Old 06-27-2006, 12:58 AM   #13
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MF-DIF is right. Originally when I went to stage 2 I didn't have a 3" catback. A month later I got borla hush and the car felt noticeably weaker in the low end but stronger on the top.
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Old 06-27-2006, 01:29 AM   #14
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Quote:
Originally Posted by 05wrxblowths
i did the same thing and it feels faster but it's really not. it's bc you dont have all that noise coming out your a@@. it's a little slower but to me it's worth it. more or a sleeper now bc people will look at your car and think it's stock. then they get a slap in the face when the light turns green.
Or you could get something that idles pretty quite and looks stock like a Borla Hush and then when you take off it roars to life and stomps them.
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Old 06-27-2006, 09:31 AM   #15
05wrxblowths
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Quote:
Originally Posted by P-TownWRX
Or you could get something that idles pretty quite and looks stock like a Borla Hush and then when you take off it roars to life and stomps them.
yeah i'm going for the hush once i sell my Perrin single tip. i hear it's nice and i like the fact it's not too much louder than the stock. +1
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Old 06-27-2006, 10:13 AM   #16
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Quote:
Originally Posted by MF-DIF
The increase in backpressure produces more low end tq. This is why your car feels faster. Run it to redline, and you will feel the lose.
Since when does this apply to turbo-charged cars...?

Its pretty commonly known to be an N/A only behavior...
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Old 06-27-2006, 10:22 AM   #17
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Maybe someone could explain to me how the scavenging benefits of a smaller exhaust system for better low-end breathing on an N/A engine can apply to a system that has a big old turbo charger sitting in the middle of the exhaust???

How can additional backpressure be effecting anything (positively) with the turbo sitting in the way.

Again, not sure why people keep comparing this N/A pumping efficiency issue to turbocharged cars...
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Old 06-27-2006, 12:10 PM   #18
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^^^ yes please explain.
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Old 06-27-2006, 12:52 PM   #19
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some of you have no idea what you are talking about.
for a turbocharged car like the wrx you want the least amount of back pressure AFTER the turbo as posible, with a small exhaust like the stock muffler you will have less power over a free flowing 3" muffler. a open downpipe will give you the most power, but its very loud and not great for daily driving.

if we were talking about NA cars it would be different, but we are not talking about them.
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Old 06-27-2006, 01:34 PM   #20
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Quote:
Originally Posted by kevinh211
some of you have no idea what you are talking about.
for a turbocharged car like the wrx you want the least amount of back pressure AFTER the turbo as posible, with a small exhaust like the stock muffler you will have less power over a free flowing 3" muffler. a open downpipe will give you the most power, but its very loud and not great for daily driving.

if we were talking about NA cars it would be different, but we are not talking about them.
its all about the low end torque and high end power, i drove around with an open downpipe for about a week and the low end power sucks, but up top it would rip, when i put my cat-back on i noticed alittle more responsivness(isthataword) to it, maybe someone else here can explain but you would have to feel it to be able to know what everyones talking about
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Old 06-27-2006, 05:50 PM   #21
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I noticed the same thing in my car. Wide open exhaust kicks ass up top, but your hurting down low. I guess it depends on how you want to use your car.
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Old 06-27-2006, 06:29 PM   #22
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Seeing as though the LOW BACKPRESSURE ON A TURBO CAR DOES NOT ELIMINATE LOW END TORQUE/POWER...

Did you guys consider this...

If you've GAINED highend power, naturally, your low end would feel a bit dead. That doesn't mean its any different, just that in comparison to the new found high end, it feels weak.

In any event...

Still looking for the explanation about how scavenging etc (achieved by a slight negative pressure created on the back side of the exhaust valves) which can add power to an N/A car, applies to a turbo car...

If you ask me, you all need new butt dynos...

Speaking of dynos... START LOOKING AT DYNO's of WRX's with TBE's....

THEY ARE NOT DOWN ON THE LOW END!!!!!!!!


The facts are clear, adding a TBE to your WRX does NOT reduce lowend power. Please recalibrate your Arses!
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Old 06-27-2006, 06:57 PM   #23
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WRX is almost like a NA car before turbo spool ..say before 2000-2200 rpm..

better low end torque before this rpm range will give you better throttle response and probably reduce some turbo lag..

yes mid to high end will be affected for sure when restriction hurt further spool up of turbo

.^^^..and it's very difficult to DYNO the low end (before 2000 rpm) , data logging would be a better approach...
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Old 06-27-2006, 08:08 PM   #24
Keif
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Quote:
Originally Posted by REX8
Seeing as though the LOW BACKPRESSURE ON A TURBO CAR DOES NOT ELIMINATE LOW END TORQUE/POWER...

Did you guys consider this...

If you've GAINED highend power, naturally, your low end would feel a bit dead. That doesn't mean its any different, just that in comparison to the new found high end, it feels weak.

In any event...

Still looking for the explanation about how scavenging etc (achieved by a slight negative pressure created on the back side of the exhaust valves) which can add power to an N/A car, applies to a turbo car...

If you ask me, you all need new butt dynos...

Speaking of dynos... START LOOKING AT DYNO's of WRX's with TBE's....

THEY ARE NOT DOWN ON THE LOW END!!!!!!!!


The facts are clear, adding a TBE to your WRX does NOT reduce lowend power. Please recalibrate your Arses!

so youve seen dyno charts of wrx's with just a downpipe and uppipe with the stock cat-back aswell?
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Old 06-28-2006, 01:24 AM   #25
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Quote:
Originally Posted by ronf
WRX is almost like a NA car before turbo spool ..say before 2000-2200 rpm..
you read my mind
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