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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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12-03-2019, 10:33 AM | #1 |
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Home brew front pipe
I swapped my stock front pipe with a resonated pipe. Now the car stutters a little when I pull away from a stand still. It just happens when I start off with a very light throttle.
I have the OFT 2 tune because I run a UEL header, I was hoping the OFT would learn about the cat delete and adjust, but its been 4 days now and its still stuttering. Would a leak cause it, I installed it myself. The borla muffler in this picture was swapped for a Vibrant 1792 resonator for clearance issues with the AT pan. |
12-03-2019, 12:31 PM | #2 |
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if you have a leak pre-O2 sensor ( headers) then it could explain a poor running condition. At the front pipe I wouldn't expect it to cause any issue except additional sound and a stink
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12-03-2019, 01:44 PM | #3 |
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Maybe a longshot...but is it rubbing somewhere and causing ping or knock in the engine?
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12-03-2019, 06:51 PM | #4 |
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12-04-2019, 09:48 AM | #5 |
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Removing the secondary cat won't effect the ECU at all, the O2 sensors are both ahead of the front pipe (before and after the primary cat in the header).
Is it possible you're just trying to use less throttle because it's louder than before, and needing more throttle to pull smoothly?
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12-04-2019, 10:10 AM | #6 | |
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12-04-2019, 12:37 PM | #7 |
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catless front pipe makes the exhaust gasses smell? does the same go for catless headers?
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12-04-2019, 01:37 PM | #8 |
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12-04-2019, 02:38 PM | #9 |
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12-05-2019, 09:51 AM | #10 | ||
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It's a total lack of cats that makes it stink. A catless front pipe with the stock header won't smell at all because there's still the stock cat in the header. A catless header with the stock front pipe won't either because there's still the stock cat in the front pipe.
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