|
|
|
04-24-2012, 12:43 PM | #331 | |
Brigadier General
162
Rep 3,151
Posts |
Quote:
|
|
Appreciate
0
|
04-24-2012, 01:13 PM | #332 | |
Lieutenant Colonel
127
Rep 1,924
Posts
Drives: 2010 135i,1989 PRO3,2001 530i
Join Date: Aug 2009
Location: Portland,OR
|
Quote:
I will leave that option to HPF to decided if they want to do that. Like I mentioned, dyno'd exhaust dont really give us any information.
__________________
135i coupe 6MT TiAg ///M sport http://www.rhominnovations.com www.musicarNW.com www.unitedBMWonline.com |
|
Appreciate
0
|
04-24-2012, 01:19 PM | #333 |
Brigadier General
162
Rep 3,151
Posts |
|
Appreciate
0
|
04-24-2012, 02:25 PM | #334 | |
Lieutenant Colonel
127
Rep 1,924
Posts
Drives: 2010 135i,1989 PRO3,2001 530i
Join Date: Aug 2009
Location: Portland,OR
|
Quote:
exhaust isnt really a go-fast modification, it is to allow your go-fast mods to work more efficiently. straight up exhaust alone will just make you sound fast.
__________________
135i coupe 6MT TiAg ///M sport http://www.rhominnovations.com www.musicarNW.com www.unitedBMWonline.com |
|
Appreciate
0
|
04-24-2012, 03:30 PM | #335 |
Enlisted Member
0
Rep 39
Posts |
Seriously? I have personally dyno'd my previous car before and after exhaust (same day)and gained almost 20whp. If this exhaust is eliminating 2 cats for us n54 guys and eliminating the rear muffler......there should be signifigant hp gains. Not to mention less bends and the 3.5" piping. Exhausts DO make power on turbo cars. If I see proof that the factory exhaust flows well enough that even this system doesn't show gains then I'll just stay stock. $1500 for no results on the dyno? I don't think so
|
Appreciate
0
|
04-24-2012, 04:33 PM | #336 |
Colonel
147
Rep 2,617
Posts
Drives: G80 Comp XDrive
Join Date: Jul 2010
Location: Chicago
|
the major choking points are the primary cats, biggest gains in exhaust system will be seen by switching to catless downpipes. I'd imagine on the 135 we'd see maybe a 15whp gain with this exhaust. You don't buy an exhaust for power on these cars, everyone should know that by now.
|
Appreciate
0
|
04-24-2012, 05:25 PM | #337 |
Enlisted Member
0
Rep 39
Posts |
If that's the case then I don't see any reason to buy a full exhaust when you can get an axleback for weight savings and sound for 1/3 the price. That's just my opinion tho. Doesn't seem right that a 3.5" straight pipe should cost over $1500 and only give 15hp, but I do believe you. Guess I'm done looking at exhausts
|
Appreciate
0
|
04-24-2012, 05:47 PM | #338 |
A Zip an a Double Cup
80
Rep 4,462
Posts |
This exhaust will save you 40lbs dont forget that.
__________________
PTF Tuned | RB's | AMS FMIC | AR DP's | HPF Exhaust | CP-E DCI | Apex Arc 8's | 235/275 Star Specs | |
Appreciate
0
|
04-24-2012, 06:02 PM | #339 |
Major General
401
Rep 9,156
Posts |
I'm not sure why anyone would want to see the delta from this exhaust on a stock tune. The majority of this forum are running some kind of tune and bolt-on's parts don't make a great deal of power on stock boost levels anyway.
|
Appreciate
0
|
04-24-2012, 06:09 PM | #340 |
Brigadier General
162
Rep 3,151
Posts |
Some people just go for the sound and looks I would say 40% maybe? I love those burn tips special adjustable since I could not find any axle back to sit flus with the CF diffuser. Also 15rwh is good to have
|
Appreciate
0
|
04-24-2012, 07:10 PM | #341 |
Colonel
147
Rep 2,617
Posts
Drives: G80 Comp XDrive
Join Date: Jul 2010
Location: Chicago
|
Allowing the turbos to spool more efficiently is invaluable, especially if you plan on upgrading them in the future
|
Appreciate
0
|
04-24-2012, 10:01 PM | #342 |
Major
77
Rep 1,009
Posts
Drives: very slow and courteous
Join Date: Mar 2009
Location: Vandenberg Village, California
|
how about 0-60 times comparison? less weight and more efficient spool should improve it what...? Was this exhaust more for preperation of the supposed N54 change to HPF single turbo?
|
Appreciate
0
|
04-25-2012, 11:58 AM | #343 |
Lieutenant Colonel
127
Rep 1,924
Posts
Drives: 2010 135i,1989 PRO3,2001 530i
Join Date: Aug 2009
Location: Portland,OR
|
So there are a lot of varied response here to address. First off if you buy exhaust purely for HP increase and are not planning to do anything else you will be disappointed. The purpose for ANY exhaust system is to create more flow, less back pressure, and increase efficiency of other mods. Its not a 1:1 comparison depending on your modifications etc. The HPF exhaust is NOT for those just looking for a different sound, it was specifically developed for those with other modifications and for the signel turbo kit. The short comings are the DP's and if you want "big" gains from an exhaust you need to remove your cats. 0-60 times are not very important to folks so you dont see a lot of that out there with exception of the manufacturer of your car. So if you want all show no go, then save your $$ and get an axle back. If you are looking to supplement your other mods then the HPF is a no brainer. it is $$, but its not for everyone.
__________________
135i coupe 6MT TiAg ///M sport http://www.rhominnovations.com www.musicarNW.com www.unitedBMWonline.com |
Appreciate
0
|
04-25-2012, 08:59 PM | #344 |
Enlisted Member
0
Rep 39
Posts |
Axle back for all show no go? You said in your last post that an exhaust isn't a "go fast" mod and others have stated this full system shouldn't show much power gains. So how is it better than an axle back? I think that if this exhaust DOES "create more flow, less back pressure, and increase efficiency of other mods" then we should see power gains. Especially on a car that already has intakes, dp's, and increased boost. What am I missing here?
|
Appreciate
0
|
04-25-2012, 10:09 PM | #345 | |
Lieutenant Colonel
127
Rep 1,924
Posts
Drives: 2010 135i,1989 PRO3,2001 530i
Join Date: Aug 2009
Location: Portland,OR
|
Quote:
__________________
135i coupe 6MT TiAg ///M sport http://www.rhominnovations.com www.musicarNW.com www.unitedBMWonline.com |
|
Appreciate
0
|
04-26-2012, 01:10 PM | #346 |
Heisenberg
51
Rep 569
Posts |
What you're saying is straight forward, he just doesn't get it.
Can you comment on the application to an N55 and also the emission question asked earlier? Really looking forward to this exhaust. |
Appreciate
0
|
04-26-2012, 02:00 PM | #347 |
Lieutenant Colonel
127
Rep 1,924
Posts
Drives: 2010 135i,1989 PRO3,2001 530i
Join Date: Aug 2009
Location: Portland,OR
|
I dont think it has been test fitted on a N55,(would defer that to Kirk) wouldnt see any reason it would fit up the same way since the single DP diverges to 2 pipes into the midpipe. please remind me of hte emission question, couldnt find it.
__________________
135i coupe 6MT TiAg ///M sport http://www.rhominnovations.com www.musicarNW.com www.unitedBMWonline.com Last edited by mineo77; 04-26-2012 at 02:07 PM.. |
Appreciate
0
|
05-07-2012, 10:10 PM | #350 |
Bimmer Newbie
27
Rep 312
Posts
Drives: CSM N54 Prem/Comf/Sound
Join Date: Aug 2010
Location: Bear's Ass Canada! (Fort Mac)
|
|
Appreciate
0
|
05-16-2012, 08:25 AM | #352 |
Colonel
147
Rep 2,617
Posts
Drives: G80 Comp XDrive
Join Date: Jul 2010
Location: Chicago
|
status?
|
Appreciate
0
|
Post Reply |
Bookmarks |
Tags |
hpf, hpf exhaust |
|
|