10-20-2015, 11:35 PM | #1 |
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catless downpipes= drone and same hp?
I installed vsrf catless downpipes tonight and the drone, (almost a loud vibration ) before boost hits is horrible. To make matters worse, my butt dyno, (i know super accurate ) says there is no hp gained. Is this normal on the 1M? I might just switch them back.
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10-21-2015, 09:02 AM | #5 |
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depending on what other upgrades you did to the car you should be on a more aggressive map with down pipes. I am using MHD and just installed downpipes and I needed a stage 2 aggressive tune. pulls hard! with my magnaflow catback I have no drone.
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10-21-2015, 10:42 AM | #7 |
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you'll want resonated or stock mids or you'll get drone with downpipes
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10-21-2015, 05:06 PM | #10 |
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is the car tuned?
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10-21-2015, 11:49 PM | #12 |
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Well, everything is fine. Nothing touching. Drone is coming from the axle back. 1800 to 2500 rpm, just as boost starts to build. I think the stock muffler is restricted , and that momentary back pressure is the culprit
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10-25-2015, 03:26 AM | #13 |
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I had the same experience:
http://www.1addicts.com/forums/showthread.php?t=1027547 Only solution: get a resonated midpipe.
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10-26-2015, 01:01 PM | #14 |
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You must flash stage 2 for the car to take advantage of the downpipes
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10-27-2015, 03:33 PM | #15 |
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get the car mapped to suit. They are a great mod but when i re flash my car before going back to bmw the car sounds and performs nowhere near a nice as stock.
With a custom map the mods you have will be worth it!
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01-04-2016, 04:31 PM | #16 |
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Catless DP will get you minimal gains if the car is not tuned for it.
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01-04-2016, 05:54 PM | #17 | |
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Quote:
If you get a tune (like everyone is suggesting) you will benefit greatly from it in regards to more bhp. |
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01-04-2016, 05:56 PM | #18 | |
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Quote:
Do you have that dyno graph?
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01-05-2016, 01:08 AM | #19 |
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Single run is stock after 2000mile running stock and the 2 other runs are stage 1 tune uploaded after 1st run.
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01-05-2016, 02:22 AM | #20 |
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Ok so you mean the increase came with stage 1 as well?
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01-05-2016, 02:26 AM | #21 |
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01-05-2016, 02:27 AM | #22 |
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Ah i see, very solid numbers
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