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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



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      05-30-2014, 02:42 PM   #1
Gizm0
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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?
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Last edited by Gizm0; 05-30-2014 at 03:02 PM.
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      05-30-2014, 02:46 PM   #2
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      05-30-2014, 02:50 PM   #3
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No room

Best way is to get ceramic coating..
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      05-30-2014, 02:52 PM   #4
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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]
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      05-30-2014, 02:55 PM   #5
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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.

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      05-30-2014, 03:01 PM   #6
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Interested to find out.
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      05-30-2014, 03:09 PM   #7
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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.
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      05-30-2014, 03:12 PM   #8
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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...
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      05-30-2014, 03:12 PM   #9
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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.
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      05-30-2014, 03:26 PM   #10
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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.
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      05-30-2014, 03:43 PM   #11
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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.
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      05-30-2014, 04:18 PM   #12
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But they aren't 3" DP's

With 2.5" DP's there may be room..
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