2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

why dont people do this?

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Old Dec 28, 2005 | 06:03 PM
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From: warner robins, georgia
why dont people do this?

i got a buddy with a 240, just did the whole turbo swap and all. he used pcv piping for his intercooler piping. sure it doesnt look as good as metal piping, but its strong enough to hold the pressure and it doesnt hold heat like the metal piping. so why dont more people do this? becuase of looks? i think it sounds pretty smart, especially if your on a budget... and it sounds like it would keep the intake charge alot cooler. also, on that same note, instead of putting an electric fan just on your rad why not put one on the intercooler. ive heard people say becuase "you dont use the boost untill the car is moving and air is flowing through" and yeah that is true but if its already cooled down say while sitting at a red light, then the charge of air once you take off will be alittle bit cooler. so why dont people do these things??????? just wondering
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Old Dec 28, 2005 | 06:05 PM
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ummm it melts?
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Old Dec 28, 2005 | 06:12 PM
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They make rubber sleeves to insulate the aluminum tubing for intercoolers. I'm sure a 2.5" PVC pipe would fit in the same sleeve that a 2.5" aluminum pipe fits in. The sleeve cover the aluminum, which doesn't score points with the style judges, but on the other hand, it could cover that ugly PVC. I've heard of people using PVC this way. I've seen people use radiator hoses in place of aluminum tubing.

As for the intercooler fan, I don't think the gain of lower air temps while sitting still is worth the investment. Once the car is moving, the fan shouldn't be needed. To further increase the intercoolers effectiveness while the car is moving, some people use a water misting system to spray the intercooler.

Last edited by Project84; Dec 28, 2005 at 06:15 PM.
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Old Dec 28, 2005 | 06:21 PM
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A fan on the I/C might help heat soak, but I doubt the temperature change would merit it's use.

PVC intercooler piping should work fine. Metal is pretty cheap and much prettier though, likely why most use it. I've run PVC for my air intakes on cars for YEARS, never had a problem. if you mold and paint it, it even looks good.
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Old Dec 28, 2005 | 06:32 PM
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Originally Posted by matts86fc3s
i got a buddy with a 240, just did the whole turbo swap and all. he used pcv piping for his intercooler piping. sure it doesnt look as good as metal piping, but its strong enough to hold the pressure and it doesnt hold heat like the metal piping.
It outgasses:

The major causes of deterioration of PVC are heat and light. In general the rate of a chemical reaction doubles if the temperature is raised by 59°F(15°C). Losing plasticizer leaves the PVC itself highly vulnerable to deterioration. Deteriorating PVC produces hydrogen chloride, a corrosive and acidic gas. If not rapidly removed from the surface of the plastic, degradation progresses three times faster than before. The acid corrodes any metals it contacts before dispersing.[54]
http://www.mindfully.org/Plastic/Pol...PWG25oct01.htm
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Old Dec 28, 2005 | 06:42 PM
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Originally Posted by J-Rat
Interesting. I've put 30K miles on my motor with a PVC intake tube, without any measurable corrosion issues.
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Old Dec 28, 2005 | 06:50 PM
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Guys using PVC, is it really PVC or the black ABS? That takes the heat I think.
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Old Dec 28, 2005 | 07:07 PM
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Originally Posted by digitalsolo
Interesting. I've put 30K miles on my motor with a PVC intake tube, without any measurable corrosion issues.

No problems then! I just present what information is available to me (and others). If PVC is working for you, then thats good!
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Old Dec 28, 2005 | 07:18 PM
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From: Hood River oregon
ABS Type I Type II
Operating Limits
0F, nonpressure 180 180
0F, pressure 160 160

The Aussies perspective on it:

http://calaisturbo.com.au/showthread.php?t=17608

Apparently it doesnt shed heat as well as metal does, so there is some heat retention. I havent looked at the science on that claim though.

Last edited by J-Rat; Dec 28, 2005 at 07:24 PM.
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Old Dec 28, 2005 | 07:43 PM
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Intercooler fans are only needed if heat soak occurs at low speed or when stopped. A FMIC shouldn't need a fan because not much heat should reach it, so any gains would be tiny and not worth it. The stock TMIC would benfit hugely from a fan but you physically can't fit one under it.

Last edited by NZConvertible; Dec 28, 2005 at 07:46 PM.
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Old Dec 28, 2005 | 08:38 PM
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toxic?
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Old Dec 29, 2005 | 12:14 AM
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not a turbo guy, but at higher speeds a fan assembly might also restrict air flow to an IC
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Old Dec 29, 2005 | 12:29 AM
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pvc in my opinion is junk. unless your trying to pump **** thru your pipes. i would buy some mandrel bends and some straight pipes and make something you can at least pop your hood at the gas station and not have someone think your a tweeker.
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Old Dec 29, 2005 | 01:33 AM
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Originally Posted by Project84
some people use a water misting system to spray the intercooler.
I always wondered why I've never seen a CO2 fogging system for ICs.

I've seen quite a few videos where they'll take a fire extinguisher and spray off teh IC before doing dyno or 1/4 mile runs but never anything that's integrated and can be used without having to get out of the car.
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Old Dec 29, 2005 | 03:05 AM
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Why no pvc? CUZ ABS IS BETTER!!!

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Old Dec 29, 2005 | 03:10 AM
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If you're using PVC, that's just plain stupid.
As J-Rat has already posted, it emits a toxic and corrosive gas.
Just because YOU haven't seen it, doesn't mean it's not possible.

IC pipes (prior to the IC) can easily hit 200F...even 300F, depending on boost level.
At these temps, it'll soften PVC and even ABS.
It just boggles my mind how people can get cheap and stupid.
If you want cheap and durable, mild steel (exhaust) pipe is a better option.

If you want to keep using dangerous materials, it's your car.
I would never recommend it nor use it myself.


-Ted
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Old Dec 29, 2005 | 03:10 AM
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Originally Posted by gxlspeeder
Why no pvc? CUZ ABS IS BETTER!!!

ghetto
i prefer not to glue turbo pipes together
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Old Dec 29, 2005 | 07:35 AM
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I have checked my one PVC fitting on my TID, and under hot conditions it's still OK.

You can use it on the TID, but the turbo's heat makes it very risky for the IC piping.
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Old Dec 29, 2005 | 08:07 AM
  #19  
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if your so hot and horny over cheap IC piping, why not use Exhaust pipe?

polish it, paint it, whatever..
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Old Dec 29, 2005 | 01:24 PM
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PVC === Bad// corrosive gases touching your engine.....
ABS == not great but better/hold pressure and does not emit gas.

I'm using ABS for my TID but I would never use it for post turbo applications.
Pressure + High Heat+ plastic doesn't sound good to me.

You say it will keep a cooler charge due to it not absorbing heat as quickly. This also means that it will Retain heat longer once it's brought to running/hot conditions.


URizen: They do have C02 coolers. Nistrous sells a thing called the N2cooler which is pretty much a line with holes in it to pureg nitrous onto the IC. They have kits with C02 which are the same.
The kit actually would probably be somewhat effective on the TMIC if it was set on some type of timing/heat temp switch. Although most people will just spend the extra money and just go FMIC.
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Old Dec 29, 2005 | 02:49 PM
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matts86fc3s's Avatar
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From: warner robins, georgia
i was just wondering. i would never use pvc just cuase id rather not have stupid looking plastic pipes up under my hood. ive seen people do it before and was wondering
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