Running with no exhaust, just dp's

onefastman · 04-13-2010, 12:35 PM

I have read on here that there was someone who went to the track with just dp's, no exhaust. From what I understand back pressure is not an issue with turbo cars. So would there be any gains from tracking a car with no exhaust, just catless dp's?

Bagelfast · 04-13-2010, 01:50 PM

Yea you will def get some gains.

No mufflers, no reasonator/x-pipe and no secondary cats and of course no tubing...

onefastman · 04-13-2010, 01:51 PM

I ask because I did it this morning and I feel a power loss. any idea if it is just me or if there is an actual loss?

Bagelfast · 04-13-2010, 02:04 PM

Cant say for sure... let the car adapt some and do a couple WOT runs.
But per turbo cars, less restrction the better as mentioned is a standard.

But if you dont have a way to measure any performance gains then it might not be very benefical.

themyst · 04-13-2010, 03:37 PM

Quote:

Originally Posted by onefastman

I have read on here that there was someone who went to the track with just dp's, no exhaust. From what I understand back pressure is not an issue with turbo cars. So would there be any gains from tracking a car with no exhaust, just catless dp's?

The guy you are talking about is boostedcosta, and I have personally witnessed him make that 11.9@117 pass with no exhaust. I am not sure if it helped or not, but you can't argue with an 11 second car with tune, dps and race gas... a 6MT to boot!

BoostedCosta · 04-13-2010, 04:23 PM

Quote:

Originally Posted by themyst

The guy you are talking about is boostedcosta, and I have personally witnessed him make that 11.9@117 pass with no exhaust. I am not sure if it helped or not, but you can't argue with an 11 second car with tune, dps and race gas... a 6MT to boot!

yea that was me
like i said on the other forum i cant say it improved my times or traps. since i never tracked my car with the exhaust on.

onefastman · 04-13-2010, 04:29 PM

Well Ive already put it back on because it was just too loud to drive around the city (where I live) and I think it feels more powerful although I have not made it to the highway as of yet.

themyst · 04-13-2010, 05:01 PM

Quote:

Originally Posted by onefastman

Well Ive already put it back on because it was just too loud to drive around the city (where I live) and I think it feels more powerful although I have not made it to the highway as of yet.

On a 135i I can see how you would net some gains. That exhaust is far more restrictive than a 335i, probably to compensate for the weight differential.

04-13-2010, 12:35 PM	#1
onefastman Major General 159 Rep 5,689 Posts Drives: 2009 135i 2011 e92m dct Join Date: Sep 2009 Location: Earth iTrader: (15)	Running with no exhaust, just dp's I have read on here that there was someone who went to the track with just dp's, no exhaust. From what I understand back pressure is not an issue with turbo cars. So would there be any gains from tracking a car with no exhaust, just catless dp's? __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise. Last edited by onefastman; 04-13-2010 at 01:36 PM..
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04-13-2010, 01:50 PM	#2
Bagelfast Lieutenant Colonel 126 Rep 1,546 Posts Drives: BMW Join Date: Sep 2008 Location: USA iTrader: (0)	Yea you will def get some gains. No mufflers, no reasonator/x-pipe and no secondary cats and of course no tubing...
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04-13-2010, 01:51 PM	#3
onefastman Major General 159 Rep 5,689 Posts Drives: 2009 135i 2011 e92m dct Join Date: Sep 2009 Location: Earth iTrader: (15)	I ask because I did it this morning and I feel a power loss. any idea if it is just me or if there is an actual loss? __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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04-13-2010, 02:04 PM	#4
Bagelfast Lieutenant Colonel 126 Rep 1,546 Posts Drives: BMW Join Date: Sep 2008 Location: USA iTrader: (0)	Cant say for sure... let the car adapt some and do a couple WOT runs. But per turbo cars, less restrction the better as mentioned is a standard. But if you dont have a way to measure any performance gains then it might not be very benefical.
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04-13-2010, 04:29 PM	#7
onefastman Major General 159 Rep 5,689 Posts Drives: 2009 135i 2011 e92m dct Join Date: Sep 2009 Location: Earth iTrader: (15)	Well Ive already put it back on because it was just too loud to drive around the city (where I live) and I think it feels more powerful although I have not made it to the highway as of yet. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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