E90Post
 


The Tire Rack
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Titanium Exhaust Wrap, what's the real truth?



Reply
 
Thread Tools Search this Thread
      10-09-2014, 03:51 AM   #1
Scotty89
Buy a 335 they said... It'll be fun they said...
Scotty89's Avatar
Australia
117
Rep
995
Posts

Drives: 2007 E92 335i
Join Date: Jun 2014
Location: Melbourne, Australia

iTrader: (0)

Garage List
2007 BMW 335i  [10.00]
Titanium Exhaust Wrap, what's the real truth?

I've ordered some VRSF downpipes, and I thought that it would be easier to wrap them before installing (obviously).

I've tried searching however and there seems to be very little threads about exhaust wrap, and of the few comments that I could find people were saying the wrap is a bad idea as it creates a moisture environment that will rust the downpipes??

First, on a forum where nearly everybody gets downpipes of some sort, I can't understand why this topic seems to be so scarce?

Second, I can't understand why there should be moisture causing rust on the downpipes? The heat should keep them dry and evaporate the moisture, and I don't live near snow. Any rain or wet roads shouldn't splash water up there due to the belly pan.

My engine bay gets really hot at present, and I've got nothing but a JB4. Everything else is standard, so I though wrapping the new downpipes would be a good idea to help prevent even higher engine bay temperatures.

Is this really a bad idea??
Appreciate 0
      10-09-2014, 03:59 AM   #2
SPJ
Private First Class
SPJ's Avatar
10
Rep
183
Posts

Drives: 2007 335i
Join Date: Dec 2011
Location: Melb

iTrader: (0)

good idea ! only issue I can see is you might restrict the clearance b/w dp's.

Moisture issue is more related to cars that see allot of water underneath, ie 4x4 etc
Appreciate 0
      10-09-2014, 04:46 AM   #3
donlokiman
Enlisted Member
2
Rep
44
Posts

Drives: 2011 335i E92 LeMans Blue
Join Date: Jan 2014
Location: Orlando, Fl

iTrader: (0)

I'm looking at downpipes and a friend suggested I wrap mine as well.
Appreciate 0
      10-09-2014, 04:51 AM   #4
donlokiman
Enlisted Member
2
Rep
44
Posts

Drives: 2011 335i E92 LeMans Blue
Join Date: Jan 2014
Location: Orlando, Fl

iTrader: (0)

Quote:
Originally Posted by donlokiman View Post
I'm looking at downpipes and a friend suggested I wrap mine as well.
Oh whether or not his suggestion was a good one or not I do not know. But you aren't the only one considering it.
Appreciate 0
      10-09-2014, 05:01 AM   #5
Ingeniator
Major
Ingeniator's Avatar
Canada
34
Rep
1,093
Posts

Drives: 07 335XI(90) 09 135I(82)
Join Date: Nov 2013
Location: Fort Mac, Alberta

iTrader: (1)

Downpipes may be alright but headers will likely crack as a result of wrapping any place that has salt(Ocean air/ salt on roads etc). The salt is exposed to metal via water when the water evaporates it leaves the residue which is going to lead to stress corrosion cracking. Just be aware of the problem and periodically check and clean the wrapped part.
__________________
07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system
Appreciate 0
      10-09-2014, 07:36 AM   #6
stanlalee
Major
261
Rep
1,093
Posts

Drives: 07' E92 335i manual
Join Date: Oct 2013
Location: Newport News, Va

iTrader: (0)

I think many have moved to coatings over wraps which I think VRSF and perhaps others offer.
Appreciate 0
      10-09-2014, 07:56 AM   #7
shadow191
Lieutenant Colonel
181
Rep
1,681
Posts

Drives: 2017 Volvo XC90 R-Design
Join Date: Dec 2012
Location: GA

iTrader: (3)

Back in the day, people wrapped headers and some of them cracked or rusted out due to moisture. But keep in mind that back then a lot of cars didn't have extensive splash shields like most cars these days. Instead of a full belly pan, you had a couple of small covers in front. Headers were often exposed. So what was a problem back then may not be a problem now.

And I think all aftermarket downpipes for the N54 are stainless so rust isn't that much of an issue. Other than a little surface rust, SS isn't going to rust through. Unless they use a really low grade.

Coatings are good, but I think the wrap does a better job in terms of heat transfer.
Appreciate 0
      10-09-2014, 07:59 AM   #8
FCobra94
Guest
0
Rep
n/a
Posts

Drives:


Quote:
Originally Posted by stanlalee View Post
I think many have moved to coatings over wraps which I think VRSF and perhaps others offer.
Agreed. I'd rather go that route anyway.

Looking forward to Tiago's thoughts/test results on the subject
Appreciate 0
      10-09-2014, 08:14 AM   #9
JamesM3M5
Some dude
United_States
91
Rep
1,780
Posts

Drives: E92 335i
Join Date: Sep 2011
Location: Northern VA

iTrader: (0)

Coatings go a long way toward reducing under hood temps, but don't count on it to drop like crazy since the turbos are the main heat generators. The manifolds are double walled to reduce heat loss before the turbine, but once they hit the turbine housing, that heat just radiates. Cats that close under the engine definitely don't help the situation, so coated DPs should still net a heat reduction benefit.

If you have new parts, Jet Hot can coat them - they don't do used parts since they don't stick as well. Swain Tech coatings are good, but I've seen too many flake off on NA racecars. Swain may be more durable on parts that don't see long periods of high heat.

My vote is for coating versus wrapping. Coatings go inside and out, where wrap is outside only.
__________________
RRT
E92 335i/6MT with stuff and things
Appreciate 0
      10-09-2014, 03:47 PM   #10
Petrolhead3010
Second Lieutenant
Petrolhead3010's Avatar
United_States
52
Rep
252
Posts

Drives: 2021 BMW X3 M40i
Join Date: Aug 2014
Location: Marysville

iTrader: (0)

How would someone do a proper coating on the inside of the piping? I've thermal coated the outside of my exhaust manifold, but never thought to do the inside
Appreciate 0
      10-09-2014, 04:33 PM   #11
Mixmaster
Private First Class
New Zealand
28
Rep
99
Posts

Drives: 335i E90 N54 / 2014 i3 REX
Join Date: Nov 2013
Location: Auckland

iTrader: (0)

Very little room around the pipes when installed. May touch with wrap on
Appreciate 0
      10-09-2014, 04:38 PM   #12
Tiago@VRSF
Tiago@VRSF's Avatar
United_States
2093
Rep
43,350
Posts

Drives: F90 M5
Join Date: Dec 2007
Location: Doral, FL

iTrader: (99)

Garage List
Proper thermal coatings are generally always better at trapping heat than wraps.

Last edited by Tiago@VRSF; 10-09-2014 at 04:48 PM..
Appreciate 0
      10-09-2014, 04:50 PM   #13
07tundra
Lieutenant Colonel
United_States
117
Rep
1,525
Posts

Drives: 8.1L Chevy 2500hd
Join Date: Jan 2012
Location: New Mexico

iTrader: (9)

exhaust

Quote:
Originally Posted by Tiago@VRSF View Post
Proper thermal coatings are generally always better at trapping heat than wraps.
How about that new exhaust
__________________
2008 335i FFTEC ST 6266,), Boostbox, VRSF 3.5 exhaust, mtech front and rear, KWVll, APEX 18x9.0, 18x12= 305/35/18 NTO1s, BMS OCC, Rb PVC, M3 tri-color stitched S-wheel,MT SWAPPED, M3 LSD diff
2008 135i mods coming soon!
Appreciate 0
      10-09-2014, 04:51 PM   #14
Tiago@VRSF
Tiago@VRSF's Avatar
United_States
2093
Rep
43,350
Posts

Drives: F90 M5
Join Date: Dec 2007
Location: Doral, FL

iTrader: (99)

Garage List
Expecting the latest production sample in within the next 2-3 weeks

Longest process ever.
Appreciate 0
      10-09-2014, 06:04 PM   #15
Eat.Sleep.Race
Out Boosting...
United_States
242
Rep
3,987
Posts

Drives: F30 335i M-Sport
Join Date: Feb 2014
Location: Northern VA

iTrader: (7)

Don't really need to do it, it can cause cracking due to so much heat being held in, Id recommend JET-HOT coating, as thats what all the race cars, and fast street cars use. Cost is around $100-150 for 2 downpipes.
__________________
Alpine White M-Sport F30
Appreciate 0
      10-09-2014, 06:14 PM   #16
cmg5461
First Lieutenant
United_States
73
Rep
315
Posts

Drives: 2008 Deep Green 335xi 6MT
Join Date: Sep 2014
Location: Falling Waters, WV

iTrader: (1)

Garage List
2008 BMW 335xi  [0.00]
Quote:
Originally Posted by shadow191 View Post
Back in the day, people wrapped headers and some of them cracked or rusted out due to moisture. But keep in mind that back then a lot of cars didn't have extensive splash shields like most cars these days. Instead of a full belly pan, you had a couple of small covers in front. Headers were often exposed. So what was a problem back then may not be a problem now.

And I think all aftermarket downpipes for the N54 are stainless so rust isn't that much of an issue. Other than a little surface rust, SS isn't going to rust through. Unless they use a really low grade.

Coatings are good, but I think the wrap does a better job in terms of heat transfer.
SS rust is clear from the chrome - what looks like rust is just tarnishing from heat
Appreciate 0
      10-09-2014, 06:48 PM   #17
3000GT MR
Major
3000GT MR's Avatar
United_States
265
Rep
1,392
Posts

Drives: 09 335i/3000gt vr4
Join Date: Jun 2012
Location: Sav GA

iTrader: (6)

Quote:
Originally Posted by Tiago@VRSF
Expecting the latest production sample in within the next 2-3 weeks

Longest process ever.
I can't wait. José you need to buy one. Sounds so good with single
__________________
Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits!
335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust
335i 2009 e90 665RWHP VFF900 ST RIP .
Appreciate 0
Reply

Bookmarks

Tags
exhaust, exhaust wrap, titanium wrap, titanium wrapping

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



All times are GMT -5. The time now is 05:43 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
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