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10-21-2019, 08:54 AM | #23 | ||
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10-21-2019, 09:50 AM | #24 |
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Mines pretty bad. Only noticeable in stopped traffic or drive thru windows LOL
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* 2011 M3 DCT * Built 4.4L Stroker * Gintani supercharger * Brembo GT * BBS FI * OHLINS * Nardo Grey *
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10-21-2019, 08:51 PM | #26 | |
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When cars have 3-way cats, the cat requires a richer mix in order to mitigate NOx. Take out the cat and that fuel goes out the tailpipe, wasted. You can't hurt anything by eliminating that wasted fuel, especially at low/no load cells on the fuel table. Also, EFI systems on catted cars add fuel to cool the cat. Take out the cat, and guess what? More wasted fuel. If there's no EGT probe in the exhaust stream then the EFI is guessing at cat temp and automatically adding fuel. Does the S65 have an EGT probe? Guess what happens if you pull out the cats and don't lean out the idle table? Now seriously, do you think you can't tune out the excess fuel in the idle cells on the S65 and stop the raw fuel smell, or at least a major dose of it? Do you think it isn't safe to do so? Many modern engines can run at stoichiometric or even leaner at idle and low load with no bad results. There's absolutely no reason to leave your car rich after a cat delete and say "that's the way it is, face the consequences".
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Dinan Stg II Suspension • Remus Race • Gintani CF lip / CF quarter fins • Vorsteiner Type II CF Diffuser • BMW Performance CF Spoiler / black fender gills / black kidney grilles / CF mirror cover • Speed Element GTS CF side skirts • M3 GTS door sills • Lux Angel Eyes • body color reflectors • Alex@Alpine Stg I tune • AA filter
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10-21-2019, 08:58 PM | #27 | |
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Dinan Stg II Suspension • Remus Race • Gintani CF lip / CF quarter fins • Vorsteiner Type II CF Diffuser • BMW Performance CF Spoiler / black fender gills / black kidney grilles / CF mirror cover • Speed Element GTS CF side skirts • M3 GTS door sills • Lux Angel Eyes • body color reflectors • Alex@Alpine Stg I tune • AA filter
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10-22-2019, 01:13 PM | #28 |
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10-24-2019, 02:32 PM | #29 | ||
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10-25-2019, 12:58 PM | #30 |
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the question is....who ISN'T?
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10-25-2019, 01:19 PM | #31 | |
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I'm just trying to get the point across to you, that it doesn't have to be like that. The smell can be gone. I mean, unless its some kind of test of manliness in your culture to have unburnt fuel odor. The Ramapan tribes used to cut off their own pinky fingers after being hung, for a day or two, suspended from hooks embedded under their chest muscles. I guess when you compare catless exhaust smell to something like that, the smell is a comparative bargain.
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Dinan Stg II Suspension • Remus Race • Gintani CF lip / CF quarter fins • Vorsteiner Type II CF Diffuser • BMW Performance CF Spoiler / black fender gills / black kidney grilles / CF mirror cover • Speed Element GTS CF side skirts • M3 GTS door sills • Lux Angel Eyes • body color reflectors • Alex@Alpine Stg I tune • AA filter
Last edited by Freiheit; 10-27-2019 at 12:27 AM.. |
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01-25-2020, 12:52 PM | #32 |
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Catless & Great Sound
I've been running catless X-pipes for 4 years (with the Epic tune). While I mostly drive with the windows up, when driving with them down I really don't notice much than a passing whiff.
If you're working in your garage (door open, of course) and have it idling, then you can smell the difference. What I'm really surprised by is that no one has mentioned the sound difference, which is beautiful. At idle and low RPM (< 4k RPM) it is tame/normal. BUT, when you get on it and get in the upper RPM band, it makes a wonderful roar; far better than stock. As such, in town you can moderate your sound by your driving/shifting style (6MT FOREVER!!!) and then let her roar when you want to. +1 to previous poster regarding making sure you can pass any emissions in your area, if applicable. |
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