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06-26-2006, 06:29 PM | #1 |
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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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06-26-2006, 06:35 PM | #2 |
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Placebo.
It's probably the lack of volume from the stock catback that is messing with you. |
06-26-2006, 07:01 PM | #3 |
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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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06-26-2006, 07:03 PM | #4 | |
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Except that placebo should make his car feel slower if anything. did you reset the ECU? |
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06-26-2006, 07:39 PM | #5 |
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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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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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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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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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06-27-2006, 12:13 AM | #9 | |
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06-27-2006, 12:19 AM | #10 |
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stock turbo
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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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06-27-2006, 12:33 AM | #12 | |
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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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06-27-2006, 01:29 AM | #14 | |
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06-27-2006, 09:31 AM | #15 | |
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06-27-2006, 10:13 AM | #16 | |
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Its pretty commonly known to be an N/A only behavior... |
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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... |
06-27-2006, 12:10 PM | #18 |
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^^^ yes please explain.
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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. |
06-27-2006, 01:34 PM | #20 | |
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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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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! |
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... |
06-27-2006, 08:08 PM | #24 | |
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so youve seen dyno charts of wrx's with just a downpipe and uppipe with the stock cat-back aswell? |
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06-28-2006, 01:24 AM | #25 | |
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