catless downpipes= drone and same hp?

hot-j · 10-20-2015, 11:35 PM

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.

Isaacata · 10-21-2015, 12:10 AM

Im not an expert but you wont see any noticeable gains until you tune, unless you are already tuned then i dont know

BTW what mid and cat back do you have?

hot-j · 10-21-2015, 12:25 AM

Mid is aftermarket which I don't know. Came with the car. Stock axle back. Car is on stage 1 cobb tune. Drone is around 2k rpm

Zuzu · 10-21-2015, 05:45 AM

The 1M has high flow cats to begin with, so the gains will be minimal.

project jayden · 10-21-2015, 09:02 AM

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.

E30 Racer · 10-21-2015, 09:15 AM

Believe it or not, the tune can have a huge effect on drone.

lowbudgethero · 10-21-2015, 10:42 AM

you'll want resonated or stock mids or you'll get drone with downpipes

hot-j · 10-21-2015, 12:38 PM

Looks like my mids have resonators. Ugh.

kiysersosae · 10-21-2015, 05:04 PM

You will see gains without a tune...around 15bhp

ilikebmxbikes · 10-21-2015, 05:06 PM

is the car tuned?

hot-j · 10-21-2015, 11:44 PM

Cobb stage 1 aggressive tune. I like bmx bikes too.... just saying.

hot-j · 10-21-2015, 11:49 PM

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

Nagata-San · 10-25-2015, 03:26 AM

I had the same experience:
http://www.1addicts.com/forums/showthread.php?t=1027547

Only solution: get a resonated midpipe.

drunkenup · 10-26-2015, 01:01 PM

You must flash stage 2 for the car to take advantage of the downpipes

octainejunkee · 10-27-2015, 03:33 PM

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!

mike@x-ph.com · 01-04-2016, 04:31 PM

Catless DP will get you minimal gains if the car is not tuned for it.

kiysersosae · 01-04-2016, 05:54 PM

Quote:

Originally Posted by mike@x-ph.com

Catless DP will get you minimal gains if the car is not tuned for it.

You will see gains of around 15 bhp without a tune, I've carried out dyno comparison. The car will also run fine without a tune and decatted pipes, with afr values almost identical across the rev range.

If you get a tune (like everyone is suggesting) you will benefit greatly from it in regards to more bhp.

mike@x-ph.com · 01-04-2016, 05:56 PM

Quote:

Originally Posted by kiysersosae

You will see gains of around 15 bhp without a tune, I've carried out dyno comparison. The car will also run fine without a tune and decatted pipes, with afr values almost identical across the rev range.

If you get a tune (like everyone is suggesting) you will benefit greatly from it in regards to more bhp.

15 HP sounds like a lot from just catless with no tune
Do you have that dyno graph?

kiysersosae · 01-05-2016, 01:08 AM

Quote:

Originally Posted by mike@x-ph.com

15 HP sounds like a lot from just catless with no tune
Do you have that dyno graph?

Single run is stock after 2000mile running stock and the 2 other runs are stage 1 tune uploaded after 1st run.

mike@x-ph.com · 01-05-2016, 02:22 AM

Quote:

Originally Posted by kiysersosae

Single run is stock after 2000mile running stock and the 2 other runs are stage 1 tune uploaded after 1st run.

Ok so you mean the increase came with stage 1 as well?

kiysersosae · 01-05-2016, 02:26 AM

Quote:

Originally Posted by mike@x-ph.com

Ok so you mean the increase came with stage 1 as well?

No, the increase (as shown in first run) came after adding catless dp. The stock on my car with full cats was 342bhp. I have that dyno somewhere so il find it and post it soon.

mike@x-ph.com · 01-05-2016, 02:27 AM

Quote:

Originally Posted by kiysersosae

No, the increase (as shown in first run) came after adding catless dp. The stock on my car with full cats was 342bhp. I have that dyno somewhere so il find it and post it soon.

Ah i see, very solid numbers

10-20-2015, 11:35 PM	#1
hot-j First Lieutenant 98 Rep 309 Posts Drives: 1M Join Date: Sep 2015 Location: Boston MA iTrader: (0)	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, 12:10 AM	#2
Isaacata Private 32 Rep 72 Posts Drives: BSM 1M Join Date: Aug 2011 Location: SoCal iTrader: (0)	Im not an expert but you wont see any noticeable gains until you tune, unless you are already tuned then i dont know BTW what mid and cat back do you have?
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10-21-2015, 12:25 AM	#3
hot-j First Lieutenant 98 Rep 309 Posts Drives: 1M Join Date: Sep 2015 Location: Boston MA iTrader: (0)	Mid is aftermarket which I don't know. Came with the car. Stock axle back. Car is on stage 1 cobb tune. Drone is around 2k rpm
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10-21-2015, 05:45 AM	#4
Zuzu Major General 2816 Rep 7,637 Posts Drives: M2C HS 6MT Join Date: Mar 2008 Location: Sydney Australia iTrader: (0)	The 1M has high flow cats to begin with, so the gains will be minimal.
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10-21-2015, 09:02 AM	#5
project jayden First Lieutenant 76 Rep 376 Posts Drives: 2009 135i Join Date: Sep 2014 Location: murrieta iTrader: (1) Garage List 2009 135i [10.00]	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, 09:15 AM	#6
E30 Racer Captain 220 Rep 695 Posts Drives: '11 1M, '09 335i M Sport Join Date: Aug 2011 Location: Ohio iTrader: (2)	Believe it or not, the tune can have a huge effect on drone.
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10-21-2015, 10:42 AM	#7
lowbudgethero Captain 125 Rep 750 Posts Drives: '98 Z3M (gone), '09 135i Join Date: Feb 2013 Location: 908 iTrader: (0) Garage List 2009 BMW 135i [8.50]	you'll want resonated or stock mids or you'll get drone with downpipes
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10-21-2015, 12:38 PM	#8
hot-j First Lieutenant 98 Rep 309 Posts Drives: 1M Join Date: Sep 2015 Location: Boston MA iTrader: (0)	Looks like my mids have resonators. Ugh.
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10-21-2015, 05:04 PM	#9
kiysersosae Lieutenant 436 Rep 571 Posts Drives: 1M, M2CS, M3CS Join Date: Jul 2013 Location: United Kingdom iTrader: (0)	You will see gains without a tune...around 15bhp
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10-21-2015, 05:06 PM	#10
ilikebmxbikes Banned 1518 Rep 4,744 Posts Drives: S65 1M Clone & E92 M3 4.6L Join Date: Apr 2011 Location: San Francisco iTrader: (42) Garage List '08/13 1M Clone 4.0L [10.00] '11 e92 M3 4.6L [10.00]	is the car tuned?
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10-21-2015, 11:44 PM	#11
hot-j First Lieutenant 98 Rep 309 Posts Drives: 1M Join Date: Sep 2015 Location: Boston MA iTrader: (0)	Cobb stage 1 aggressive tune. I like bmx bikes too.... just saying.
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10-21-2015, 11:49 PM	#12
hot-j First Lieutenant 98 Rep 309 Posts Drives: 1M Join Date: Sep 2015 Location: Boston MA iTrader: (0)	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
Nagata-San Homyseed 69 Rep 261 Posts Drives: '11 BMW 1M AW Join Date: Oct 2009 Location: Switzerland iTrader: (0)	I had the same experience: http://www.1addicts.com/forums/showthread.php?t=1027547 Only solution: get a resonated midpipe. __________________ NOW: '11 BMW 1M AW "Nabila" PREVIOUS: '09 BMW 335i DKG (DCT) "never too big" BEFORE:'09 BMW 135i F1 Sauber Edition 120/135 Team Homyseed
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10-26-2015, 01:01 PM	#14
drunkenup Captain 214 Rep 988 Posts Drives: 2009 135i, 2021 F150 Join Date: Sep 2013 Location: NJ iTrader: (1)	You must flash stage 2 for the car to take advantage of the downpipes __________________ MHD \| BMS \| VRSF \| APEX \| RECARO \| TC Kline \| BERK \| Turner Motorsport \| Eibach \| BMW Performance
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10-27-2015, 03:33 PM	#15
octainejunkee Second Lieutenant 25 Rep 260 Posts Drives: M3 f80 Comp, MPE, stage 1 Join Date: Mar 2012 Location: gatwick (uk) iTrader: (0)	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! __________________ BSM 1M owned from new.
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01-04-2016, 04:31 PM	#16
mike@x-ph.com Joint Chiefs of Staff 24199 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Catless DP will get you minimal gains if the car is not tuned for it. __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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