Wraping down pipe

[boostx]

how may have wrap down pipe

 

[Two Lane]

Generally NOT recommended due to fire hazard...

HTH

 

[U1ARUNIT]

Two thing to remember concerning wrapping...

Wrap your willy... Don't wrap your down pipe.

 

[GNsQuick]

thats funny!

 

[Hawaiian Turbo]

I wrapped my downpipe. It's rated at 3600 degrees though. If you do decide to wrap it, make sure you get the high heat rated one for obvious reasons.

HTH

Paul

 

[charlloots]

i have my dp wrapped dont see any problem with it . cant see it catching fire like a crossover pipe could only because oil would drip onto the crossoverpipe. anyway car is 3 -4 degrees cooler at idle. this is a subject where the responce will be 50-50.
charlloots
we4

 

[wiked87gn]

i dont like wrapping my pipe.

the reason is you cant feel the heat coming from inside the engine that is working the pipe..

 

[Two Lane]

If other people have done things that have resulted in their cars burning down, you possibly could consider not doing the same thing yourself.

But, if a person wanted to go ahead & do it anyway, they might want to weld on a fire extinguisher posing as a hood ornament...just in case.

HTH

 

[ijames]

The fire hazard isn't from the wrap itself, it's from the wrap acting like a sponge to trap spilled/leaked oil/trans fluid/brake fluid, getting soaked until a fire starts. Without the wrap the fluid would probably burn off one drop at a time instead of building up as it soaks into the wrap. Joey Perrotta had a fire from this a couple of years ago when he wrapped his dp and then had an oil leak.

 

[Hawaiian Turbo]

I could see the oil soaked wrap catching fire. I blew a headgasket, and there was oil on the wrap. I just replaced the wrap with a fresh one. If you don't check your engine frequently, I would,but I'm constantly checking under the hood, so I hope I notice the oil leaking on the wrap before it gets out of hand. I run my car on the street also, so I prefer to lower the temps under the hood.

 

[pwrhws]

I wrapped my dp, only by the upper control arm bushing.


Some days I might be happy if it did catch fire!

 

[KevinBroadwater]

dp

pwrhws
Don't tell me you would like the GN back! Just kidding are you going to Bristol?

 

[tom h]

what, may I ask, is the purpose of wrapping the downpipe

gasses in the DP have exited the turbo & have started to "cool" (relatively speaking), so the heat energy is not recoverable to allow faster spool or higher boost .

I can see the benefit of keeping gasses BEFORE the turbo as hot as possible, but not AFTER.

Because the heat energy delivered to the turbo depends on the gas temperature DIFFERENCE across the turbo, arguably it is better to let the temp After the Turbo be as low as possible.

 

[JToups386]

I've had a wrapped THDP for 4+ years, with absolutely no problems. Before the THDP, I had wrapped Hooker, with no problems. Before the Hooker, I had a wrapped stocker with no problems. Before that stocker, I had another stocker on another car with no problems. I guess what I'm saying is; I've never had any problems with wrapping a downpipe! It just made good sense to me, to keep "under-the-hood" temps lower, since I do 90% street playing, and 10% track time. I certainly don't think it has had any mentionable effect on my exhaust velocity or exhaust energy either.
I know there are some scientific theories behind those concerns, that make sense,,, but,,, as I said, it just didn't seem to make a difference on my particular setups.
As for oil leaks and fires, well; anyone who owns one of these cars should be opening his/her hood often enough to notice if anything like that is happening, and,,, should not be driving them around if they have such problems to begin with. However, I may be speaking from a "perfect world" standpoint, and Lord knows none of us live in those conditions. So,,, to wrap, or not to wrap,,, remains the question... Me, I always wrap...

 

[AsphaltAnihil8r]

Never leave home without pipe wrap in your wallet

 

[nitrousmike175]

There seems to different thoughts about wraping or not wraping the down pipe but what about Jet Hot. Not only does it look cool it will lower the temp under the hood. Let me know if anyone has done this.

 

[REDS HOT AIR]

im about to wrap my external atr pipe since its melting my fenderwell


as far as heat after the turbo....hot exaust will travel much faster than cold so you dont want it to cool when it comes out the turbo you want it to keep gett'n it

 

[Kid with a toy]

I'm waiting for Steve to come in with a quote from a thermal dynamics text book.

Sorry Steve, I couldn't resist.
Erik Fred Dude

 

[tom h]

Originally posted by REDS HOT AIR
as far as heat after the turbo....hot exaust will travel much faster than cold so you dont want it to cool when it comes out the turbo you want it to keep gett'n it

No, it won't. Now maybe the power benefits of hot vs cold aren't so significant on a TR, but ANY heat engine (car turbo, steam turbine, internal combustion, etc) WILL extract more power from the "fluid" (exhaust in this case) if the temperature drop across the turbine is maximized. These are physical laws and have held up to over a century of industrial design and experience.

In the limiting case, if there was really Zero temperature difference between inlet & outlet, the turbo would Not turn! Why? Because there is same quantity of gas on both sides (assuming no leaks) ... same temperature implies same pressure at inlet & outlet ... without any pressure difference, there's no physical force to turn the blades!

There's more benefit to keeping the exhaust gas in the headers as hot as possible (pre-turbo) and letting it cool as much as possible immediately at the turbo's outlet (not 6 feet away).

Having said that, secondary benefits (like not melting fender wells !) is probably of more practical importance!

 

[Kid with a toy]

... same temperature implies same pressure at inlet & outlet ... without any pressure difference, there's no physical force to turn the blades!

But wouldn't there be pressure and flow differences? And if not, why? Not trying to be a smart ass...just curious.

Erik