n55 Muffler delete after one week..

shockin330i · 07-15-2010, 02:07 PM

Well I'm not sure if I like the tone or not. My 1/4 suffered a bit after I had it done. Seems like the car takes longer to spool up. However I did the "golf tee" mod and the car does seem to spool up a lot quicker now. Not sure why.

Pre MD I would launch my car around 1500rpms. Anything over that and the wheels were spinning. Post MD the car had to be launched at around 2k rpms or else I would have horrible 60' times. I haven't gone back after the "golf tee" mod. I just might go in a week or two. Gonna let the car rest for awhile.

RyanMv4 · 07-15-2010, 02:10 PM

Post vids !!

shockin330i · 07-15-2010, 02:12 PM

Quote:

Originally Posted by RyanMv4

Post vids !!

Pre golf tee it sounded horrible. Not sure if the muffler shop messed anything up, but the flange would rattle as it opened and closed. It sounded funny because you would hear the tone then when you let off the gas it just went mute. My girl at the time said it sounded like a lawnmower.

I have the video at work. I'll try and post it today.

Aw_335i · 07-15-2010, 05:20 PM

please post i would like to hear it. I just got my h pipe removed and straight piped with stock mufflers and it definitely gargles more but i would like it to sound a lil bit louder but not too loud

EastCoast335i · 07-15-2010, 05:27 PM

My 2cents...
Less backpressure caused by the muffler felete may make your turbos take longer to spool...
With a tune I think you would see gains by deleting your muffler...

shockin330i · 07-15-2010, 05:57 PM

Quote:

Originally Posted by Aw_335i

please post i would like to hear it. I just got my h pipe removed and straight piped with stock mufflers and it definitely gargles more but i would like it to sound a lil bit louder but not too loud

Pics of your set up..

Quote:

Originally Posted by EastCoast335i

My 2cents...
Less backpressure caused by the muffler felete may make your turbos take longer to spool...
With a tune I think you would see gains by deleting your muffler...

I guess I'm new at this but, how is it that doing a muffler delete with a tune would help better gains? Is it due to the tune calculating the decrease in back pressure?

RyanMv4 · 07-15-2010, 06:34 PM

Quote:

Originally Posted by shockin330i

Pics of your set up..

I guess I'm new at this but, how is it that doing a muffler delete with a tune would help better gains? Is it due to the tune calculating the decrease in back pressure?

Your essentially increasing the airflow a good deal over stock which isnt accounted for/adjusted by the MAF therefore if you get it tuned for the increased airflow your going to maximize your gains

EastCoast335i · 07-15-2010, 06:38 PM

Quote:

Originally Posted by shockin330i

Pics of your set up..

I guess I'm new at this but, how is it that doing a muffler delete with a tune would help better gains? Is it due to the tune calculating the decrease in back pressure?

This is like the bllind leading the blind

From what I read, a tune would benefit from a free flowing exhaust because of the increase in pressure created by the tune. More exhaust pressure, would logically increase the need for exhaust flow to maintain the correct ratio of backpressure and exhaust release.
Or I could be completely wrong... You should really wait til an expert chimes in.

GreenPlease · 07-15-2010, 10:15 PM

It's pretty well documented that reducing backpressure on a turbocharged car is only a positive thing (Either Shiv or Eric posted a whitepaper from Garett Turbo showing this).

With that said, I think you're experiencing lag induced by the DME. There's probably some unforeseen feedback loop with vavletronic that's preventing you from realizing a performance gain.

Less backpressure->quicker spool/more airflow at a lower RPM->valvetronic reduces lift/changes timing->you experience lag

...or something like that.

Tiago@VRSF · 07-15-2010, 10:35 PM

Quote:

Originally Posted by EastCoast335i

My 2cents...
Less backpressure caused by the muffler felete may make your turbos take longer to spool...
With a tune I think you would see gains by deleting your muffler...

Removing back pressure will always benefit spool. Removing backpressure is key in any turbo exhaust.

D.B.S · 07-15-2010, 10:43 PM

Sooo... If the DME is causing the issue, the only way to benefit from removal of 2nd Cats, Installation of an Aftermarket DP, Muffler Delete, or any other type of performance mod, you'd need a tune...

shockin330i · 07-16-2010, 02:54 AM

Got it. Now I just wish these guys could hurry up and get a tune out for the n55...

shockin330i · 07-20-2010, 02:43 PM

Crisp · 07-20-2010, 02:51 PM

Quote:

Originally Posted by shockin330i

Do a drive by or something, it's hard to tell what it sounds like because it's so loud and the mic is mostly picking up "noise" not really the tone of the exhaust.
Did I mention that it's LOUD? lol

shockin330i · 07-20-2010, 03:26 PM

Super loud...

vettegator005 · 07-20-2010, 10:38 PM

golf tee mod?

wareagle900 · 07-20-2010, 10:50 PM

Doesn't the muffler delete make the golf tee mod impossible? Or does the section with the valve remain in the tips?

vettegator005 · 07-20-2010, 11:02 PM

sounds mean

shockin330i · 07-21-2010, 03:04 AM

Quote:

Originally Posted by wareagle900

Doesn't the muffler delete make the golf tee mod impossible? Or does the section with the valve remain in the tips?

The valve system remains in the tips. But for some reason, not sure if they didn't put the tips exactly right, but after a few start ups the valve became lose and would rattle under acceleration. So I pulled the plug in the trunk and it sounds pretty loud....

wareagle900 · 07-21-2010, 03:07 AM

hmm, well i know on my 330 the golf tee did next to nothing but i hear that it makes a noticeable difference on the 335.

shockin330i · 07-21-2010, 03:13 AM

It makes a huge difference. Well at least on the MD. But I'm not liking my 1/4 mile times now. If a tune does make it better with a MD than without I'll leave it off.

newbieman78 · 07-21-2010, 03:15 AM

i doubt any of these things (MD or golf tee mod) have anything to do with what you are feeling and with track times. golf tee mod only affects sound and a muffler is just that...a muffler....it muffles sound. has nothing to do with anything else really.

07-15-2010, 02:07 PM	#1
shockin330i Brigadier General 807 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	n55 Muffler delete after one week.. Well I'm not sure if I like the tone or not. My 1/4 suffered a bit after I had it done. Seems like the car takes longer to spool up. However I did the "golf tee" mod and the car does seem to spool up a lot quicker now. Not sure why. Pre MD I would launch my car around 1500rpms. Anything over that and the wheels were spinning. Post MD the car had to be launched at around 2k rpms or else I would have horrible 60' times. I haven't gone back after the "golf tee" mod. I just might go in a week or two. Gonna let the car rest for awhile. __________________ ERnie 2016 BSM/f80/ZCP
	Appreciate 0 Tweet Quote

07-15-2010, 02:10 PM	#2
RyanMv4 First Lieutenant 37 Rep 374 Posts Drives: 2020 440xi Join Date: Jun 2010 Location: PA iTrader: (2)	Post vids !!
	Appreciate 0 Quote

07-15-2010, 05:20 PM	#4
Aw_335i New Member 0 Rep 15 Posts Drives: 2011 E90 335i Join Date: Jul 2010 Location: 617/781 iTrader: (1)	please post i would like to hear it. I just got my h pipe removed and straight piped with stock mufflers and it definitely gargles more but i would like it to sound a lil bit louder but not too loud
	Appreciate 0 Quote

07-15-2010, 05:27 PM	#5
EastCoast335i Colonel 95 Rep 2,160 Posts Drives: 2015 X5 \| 2008 335i Join Date: Sep 2007 Location: NJ iTrader: (4)	My 2cents... Less backpressure caused by the muffler felete may make your turbos take longer to spool... With a tune I think you would see gains by deleting your muffler...
	Appreciate 0 Quote

07-15-2010, 10:15 PM	#9
GreenPlease Lieutenant Colonel 146 Rep 1,629 Posts Drives: BMW 335i e92 Join Date: Feb 2008 Location: Orlando Florida iTrader: (2)	It's pretty well documented that reducing backpressure on a turbocharged car is only a positive thing (Either Shiv or Eric posted a whitepaper from Garett Turbo showing this). With that said, I think you're experiencing lag induced by the DME. There's probably some unforeseen feedback loop with vavletronic that's preventing you from realizing a performance gain. Less backpressure->quicker spool/more airflow at a lower RPM->valvetronic reduces lift/changes timing->you experience lag ...or something like that. __________________ Cars>Women
	Appreciate 0 Quote

07-15-2010, 10:43 PM	#11
D.B.S Lieutenant Colonel 30 Rep 1,748 Posts Drives: '11 X5 35i / '13 S5 Join Date: Jun 2009 Location: Deployed to Kuwait iTrader: (2)	Sooo... If the DME is causing the issue, the only way to benefit from removal of 2nd Cats, Installation of an Aftermarket DP, Muffler Delete, or any other type of performance mod, you'd need a tune... __________________ BMW X5 35i: Boopie Exhaust & Intercooler, K&N Drop in Filter, JB3 (3+ psi) 2013 Dodge Challenger R/T: CAI, Catch Can, Custom Exhaust, Headers, 87MM Throttle Body, Diablo Custom 93 OCT Tune
	Appreciate 0 Quote

07-16-2010, 02:54 AM	#12
shockin330i Brigadier General 807 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	Got it. Now I just wish these guys could hurry up and get a tune out for the n55... __________________ ERnie 2016 BSM/f80/ZCP
	Appreciate 0 Quote

07-20-2010, 02:43 PM	#13
shockin330i Brigadier General 807 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	__________________ ERnie 2016 BSM/f80/ZCP
	Appreciate 0 Quote

07-20-2010, 03:26 PM	#15
shockin330i Brigadier General 807 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	Super loud... __________________ ERnie 2016 BSM/f80/ZCP
	Appreciate 0 Quote

07-20-2010, 10:38 PM	#16
vettegator005 Second Lieutenant 22 Rep 211 Posts Drives: C5 corvette 424rwhp Join Date: Feb 2010 Location: Fort Collins iTrader: (0)	golf tee mod?
	Appreciate 0 Quote

07-20-2010, 10:50 PM	#17
wareagle900 Banned 31 Rep 413 Posts Drives: 2006 BMW 330i Join Date: Aug 2009 Location: South East Alabama iTrader: (0)	Doesn't the muffler delete make the golf tee mod impossible? Or does the section with the valve remain in the tips?
	Appreciate 0 Quote

07-20-2010, 11:02 PM	#18
vettegator005 Second Lieutenant 22 Rep 211 Posts Drives: C5 corvette 424rwhp Join Date: Feb 2010 Location: Fort Collins iTrader: (0)	sounds mean
	Appreciate 0 Quote

07-21-2010, 03:07 AM	#20
wareagle900 Banned 31 Rep 413 Posts Drives: 2006 BMW 330i Join Date: Aug 2009 Location: South East Alabama iTrader: (0)	hmm, well i know on my 330 the golf tee did next to nothing but i hear that it makes a noticeable difference on the 335.
	Appreciate 0 Quote

07-21-2010, 03:13 AM	#21
shockin330i Brigadier General 807 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	It makes a huge difference. Well at least on the MD. But I'm not liking my 1/4 mile times now. If a tune does make it better with a MD than without I'll leave it off. __________________ ERnie 2016 BSM/f80/ZCP
	Appreciate 0 Quote

07-21-2010, 03:15 AM	#22
newbieman78 Second Lieutenant 21 Rep 274 Posts Drives: bmw 335i Join Date: Nov 2008 Location: Las Vegas iTrader: (0)	i doubt any of these things (MD or golf tee mod) have anything to do with what you are feeling and with track times. golf tee mod only affects sound and a muffler is just that...a muffler....it muffles sound. has nothing to do with anything else really. __________________ [SIGPIC][/SIGPIC]
	Appreciate 0 Quote