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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > n55 Muffler delete after one week..



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      07-21-2010, 03:50 AM   #23
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Quote:
Originally Posted by newbieman78 View Post
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.
Its just weird that my launches were different along with my trap speeds. I guess I'll have to go back 2morrow and see what the deal is..
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      07-21-2010, 04:13 AM   #24
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You shouldn't change anything on the N55 intake/exhaust without tuning...it just loses power due to the way the air sensors work.
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      07-21-2010, 09:53 AM   #25
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Quote:
Originally Posted by cstavaru View Post
You shouldn't change anything on the N55 intake/exhaust without tuning...it just loses power due to the way the air sensors work.
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      07-21-2010, 01:25 PM   #26
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There are no sensors around the exhaust so i don't believe that had anything to do with it...
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      07-21-2010, 01:48 PM   #27
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Quote:
Originally Posted by wareagle900 View Post
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.
Does nothing an any BMW. It is just for sound control.
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      07-21-2010, 05:30 PM   #28
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Quote:
Originally Posted by shockin330i View Post
There are no sensors around the exhaust so i don't believe that had anything to do with it...
No, but what happens is the DME might react by the turbos spinning easier due to the loss of back pressure.
I've heard the same thing regarding the N55.
Don't do anything unless a tune is involved.
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      07-21-2010, 05:43 PM   #29
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Quote:
Originally Posted by shockin330i View Post
Its just weird that my launches were different along with my trap speeds. I guess I'll have to go back 2morrow and see what the deal is..
could be related to track conditions; different day different weather etc.. but I agree with all that less backpressure is a huge plus for a turbo'd car.. the record holding 135 that ran low 11's at almost 130mph had electric cutouts installed right after the dp's...
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      07-21-2010, 09:50 PM   #30
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That sucks... Shiv better hurry up with the N55 harness, I want to slap the procede in as soon as I get my X5... GUess those with the JB3 are in better shape though... But One more way for BMW to make it harder for those with N55's to tune/mod...
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      07-22-2010, 05:47 AM   #31
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Quote:
Originally Posted by Mr. 5 View Post
No, but what happens is the DME might react by the turbos spinning easier due to the loss of back pressure.
I've heard the same thing regarding the N55.
Don't do anything unless a tune is involved.
funny you mention that. I noticed today that 1st gear no longer hits redline. Even after launch and in "manual mode" the car will shift itself around 6400/6500rpms and I hear the turbo whinning a bit.
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      08-12-2010, 06:16 PM   #32
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Mufflers back on. It's so quiet now
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      08-12-2010, 06:28 PM   #33
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any difference now?
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      08-12-2010, 06:30 PM   #34
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Quote:
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any difference now?
Heading out to the race track 2morrow to see. It does feel a little more powerful in the lower rpms. I loved the sound but I love going faster even more.
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      08-12-2010, 07:02 PM   #35
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just take of the resonator and leave stock muffler you will like the outcome..
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      08-12-2010, 07:36 PM   #36
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I'll keep that in mind. Just did a little drive and the car seems to have a little more ump to it... Back to 1500k launches. 1600 and the wheels were spinning...
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      08-14-2010, 04:35 AM   #37
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Quote:
Originally Posted by black e View Post
any difference now?
Ran the same 13.9x @ about 98/99mph.

What I did notice tonight is that the car was running extremely hot. Never had the car read 250 degrees. Hell not even when I was pushing it in the desert. Got me a little worried....
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      08-14-2010, 01:23 PM   #38
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So it wasn't the exhaust?
I have a MD on my 2011 135 and I didn't feel any difference at all.....
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      08-14-2010, 01:43 PM   #39
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not sure really. Maybe it's the fact that it is so damn hot out.
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