E90Post
 


Bimmer Retrofit
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Heat wrap downpipes



Reply
 
Thread Tools Search this Thread
      05-30-2014, 02:42 PM   #1
Gizm0
Major
 
Gizm0's Avatar
 
Drives: 08 e92 335i 6mt
Join Date: Jan 2013
Location: Virginia

Posts: 1,323
iTrader: (1)

Heat wrap downpipes

Hey guys,

Any of you heat wrap your downpipes? I just ordered a set from VRSF and was thinking about doing this before I put them on.

I know that heat wrapping the exhaust = more heat inside the exhaust = better flow = more power, and also less temperature inside the engine bay.

Are there any downsides of doing this?
__________________
mtec AE - Paintend Side Markers - Aero Lip - 35% tint - BMW Rear Deck Spoiler - JB4 - VRSF 3" DP - BMS DCI - ER CP - Tial BOV

Last edited by Gizm0; 05-30-2014 at 03:02 PM.
Gizm0 is offline   United_States
0
Reply With Quote
      05-30-2014, 02:46 PM   #2
teknic90
Private First Class
 
teknic90's Avatar
 
Drives: 08 e90 335i
Join Date: Jun 2012
Location: Dallas, TX

Posts: 172
iTrader: (5)

Garage List
2008 BMW 335i  [4.00]
+1 subscribed.
teknic90 is offline   United_States
0
Reply With Quote
      05-30-2014, 02:50 PM   #3
phil200tdi
Colonel
 
phil200tdi's Avatar
 
Drives: 335i M Sport E90 LCI manual
Join Date: Jan 2011
Location: Aylesbury

Posts: 2,620
iTrader: (1)

No room

Best way is to get ceramic coating..
__________________
Car: 2010 Jaguar XFR (Stock - For now)
Gone but not forgotten: Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
phil200tdi is offline   United Kingdom
0
Reply With Quote
      05-30-2014, 02:52 PM   #4
Gizm0
Major
 
Gizm0's Avatar
 
Drives: 08 e92 335i 6mt
Join Date: Jan 2013
Location: Virginia

Posts: 1,323
iTrader: (1)

Quote:
Originally Posted by phil200tdi View Post
No room

Best way is to get ceramic coating..
I just found this thread... looks like there is enough room. http://www.***********.com/showthrea...wrap-downpipes

[IMG]http://www.***********.com/images/imported/2011/02/img20110210223447-1.jpg[/IMG]
__________________
mtec AE - Paintend Side Markers - Aero Lip - 35% tint - BMW Rear Deck Spoiler - JB4 - VRSF 3" DP - BMS DCI - ER CP - Tial BOV
Gizm0 is offline   United_States
0
Reply With Quote
      05-30-2014, 02:55 PM   #5
Gizm0
Major
 
Gizm0's Avatar
 
Drives: 08 e92 335i 6mt
Join Date: Jan 2013
Location: Virginia

Posts: 1,323
iTrader: (1)

Quote:
Originally Posted by Gizm0 View Post
I just found this thread... looks like there is enough room. http://www.***********.com/showthrea...wrap-downpipes

[IMG]http://www.***********.com/images/imported/2011/02/img20110210223447-1.jpg[/IMG]
Crap, e90post won't let you put a link to a competitor's website of e90post... Well here is the picture.

Gizm0 is offline   United_States
0
Reply With Quote
      05-30-2014, 03:01 PM   #6
Pr335bob
Lieutenant
 
Drives: Black on black e92
Join Date: Oct 2011
Location: Puerto Rico USA

Posts: 541
iTrader: (0)

Interested to find out.
Pr335bob is offline  
0
Reply With Quote
      05-30-2014, 03:09 PM   #7
RIDERDIE
Second Lieutenant
 
Drives: 07 335i SGM COUPE
Join Date: Oct 2012
Location: VIRGINIA BEACH

Posts: 200
iTrader: (1)

I'd have to 2nd the no room. The rear turbo dp comes really close to a suspension sub frame even with the heat shield removed I am touching. Just got done with uninstalling and reinstalling it trying for hours to get a better fit with no luck.

People are going to say installer error but I tried several times but when you tighten everything up it still finds its way back over.
RIDERDIE is offline  
0
Reply With Quote
      05-30-2014, 03:12 PM   #8
Gizm0
Major
 
Gizm0's Avatar
 
Drives: 08 e92 335i 6mt
Join Date: Jan 2013
Location: Virginia

Posts: 1,323
iTrader: (1)

Quote:
Originally Posted by RIDERDIE View Post
I'd have to 2nd the no room. The rear turbo dp comes really close to a suspension sub frame even with the heat shield removed I am touching. Just got done with uninstalling and reinstalling it trying for hours to get a better fit with no luck.

People are going to say installer error but I tried several times but when you tighten everything up it still finds its way back over.
I know it's tight in there, I replaced my turbos myself a month ago. The stock downpipes are fat (because of the catalytic converter), and aftermarket downpipes are smaller so if anything, it should fit easier...

I've been reading more about it and it sounds like people have mixed opinions about wrapping the exhaust... The main downside I read about is corrosion. Moisture getting trapped in the wrapping material, in contact with the downpipe, will accelerate corrosion. Depending on where you live, it may be OK. In Phoenix, AZ for instance, i would definitely do this mod, but here where I live, it rains a lot + lots of salt on the road in the winter...
Gizm0 is offline   United_States
0
Reply With Quote
      05-30-2014, 03:12 PM   #9
E92Dizzle
New Member
 
E92Dizzle's Avatar
 
Drives: 335xi 2 dr
Join Date: Nov 2012
Location: Markham

Posts: 26
iTrader: (0)

You have to be careful with heat wrap. Wrapping the downpipes adds a lot of heat and stress to the metal. Over time the metal can fatigue and cause a stress fracture. I believe ceramic coating is the way to go.
__________________
DCI, Cobb, KW V1, 19" LM Reps, Spacers, 4k HID Fogs, VRSF DP, VRSF 7" FMIC
E92Dizzle is offline  
0
Reply With Quote
      05-30-2014, 03:26 PM   #10
Gizm0
Major
 
Gizm0's Avatar
 
Drives: 08 e92 335i 6mt
Join Date: Jan 2013
Location: Virginia

Posts: 1,323
iTrader: (1)

Quote:
Originally Posted by E92Dizzle View Post
You have to be careful with heat wrap. Wrapping the downpipes adds a lot of heat and stress to the metal. Over time the metal can fatigue and cause a stress fracture. I believe ceramic coating is the way to go.
Catless downpipes will be much cooler than catted downpipes... The catalytic converter produces a lot of heat. Unless the downpipe has some weld defects, i'm not sure heat wrapping will generate so much heat that it will cause failure, but your point makes good sense though... heat/cold/heat/cold/heat/cold cycles put a lot of stress on the metal.
__________________
mtec AE - Paintend Side Markers - Aero Lip - 35% tint - BMW Rear Deck Spoiler - JB4 - VRSF 3" DP - BMS DCI - ER CP - Tial BOV
Gizm0 is offline   United_States
0
Reply With Quote
      05-30-2014, 03:43 PM   #11
RIDERDIE
Second Lieutenant
 
Drives: 07 335i SGM COUPE
Join Date: Oct 2012
Location: VIRGINIA BEACH

Posts: 200
iTrader: (1)

Another thing which I've discovered with my bikes is the life of the wrap isn't long. It dries and becomes brittle. Like mentioned above going catless is already a decrease in heat because of the increase in flow.

Ceramic coating or just leave em be.
RIDERDIE is offline  
0
Reply With Quote
      05-30-2014, 04:18 PM   #12
phil200tdi
Colonel
 
phil200tdi's Avatar
 
Drives: 335i M Sport E90 LCI manual
Join Date: Jan 2011
Location: Aylesbury

Posts: 2,620
iTrader: (1)

But they aren't 3" DP's

With 2.5" DP's there may be room..
__________________
Car: 2010 Jaguar XFR (Stock - For now)
Gone but not forgotten: Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
phil200tdi is offline   United Kingdom
0
Reply With Quote
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 11:45 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST