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How hot does the 'cold' side of the turbo get?

Preparing to drive my newly acquired 930 cross country and have one item that requires attention before the trip per the owner. The cold side of the turbo has a simple cone filter clamped directly to it... hangin in the breeze. If you look closely in the pix, you can see it


Good for dry cali and great roads, but not so good for driving through a rainstorm in Texas or wherever on the way back east. I have a solution which involves attaching a rubber boot to the turbo inlet (4"), and running flexible aluminum vent tubing into the engine bay, to which of course the air filter is attached (The intake air is warmer, but dry) . My question is, how much temp does the rubber boot need to be resistant to? The problem with clamping the ducting directlly to the turbo, is that the inlet is 4", and too fit the tubing into the engine bay, needs to be 2-3" This is not a permanenent solution, only one to get me and the car home. Thanks guys
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'79 930/934 replica
80 RSR-look(Now in Sicily)
914/6 2.7 (Projekt 908/3)
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Old 04-25-2008, 07:22 PM
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On average ~150-200 degrees of so, nothing you need to worry about melting rubber or anything.

BTW...a little water mist in the motor doesn't hurt anything. Think of it as a poor mans water injection system

Just buy a 3"-4" silicone transition coupler. They're only like $20 from most GOOD turbo shops online....check out www.vwturbo.com link to part is below


http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=ATP-SIL-053&Category_Code=SIL-TRN
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Old 04-25-2008, 07:40 PM
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Thanks Adam, will do. Geez, you guys really do know everything!
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'79 930/934 replica
80 RSR-look(Now in Sicily)
914/6 2.7 (Projekt 908/3)
1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW
D-Zug Produkte/D-Zug.com
Old 04-25-2008, 07:58 PM
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i have mine in the weather so to speak. K&N has a dry sock thing that goes over the filter, it's like a chicks nylon stocking.

bending reducers here, http://www.siliconeintakes.com/index.php?cPath=14&osCsid=9e0cd66f7c8e886be0d29e1881e28503
maybe cheaper elsewhere, but this is where I've got mine before. I like ATP to
Old 04-25-2008, 08:03 PM
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Thanks Jer. Is silicone the material of choice here vs rubber? Is is more heat resistant?
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'79 930/934 replica
80 RSR-look(Now in Sicily)
914/6 2.7 (Projekt 908/3)
1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW
D-Zug Produkte/D-Zug.com
Old 04-25-2008, 08:15 PM
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Just be careful with the flexible tubing. Reinforced is better. There is a slight pressure deferential between atmosphere and the inside of the tube due to the pressure drop across the air filter. It's not much, but it could invariably collapse a thin aluminum tube.
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Old 04-26-2008, 05:28 AM
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Thanks guys...got a bunch of 4" and 3" silicone boots, bends, piping etc for the above sources... should be able to fabricate something when i get out there next week. I cant believe that all that is holding this air filter on the intake side is a simple hose clamp (pix from owner)!!

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'79 930/934 replica
80 RSR-look(Now in Sicily)
914/6 2.7 (Projekt 908/3)
1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW
D-Zug Produkte/D-Zug.com
Old 04-26-2008, 09:47 AM
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Quote:
Originally Posted by juicersr View Post
Thanks guys...got a bunch of 4" and 3" silicone boots, bends, piping etc for the above sources... should be able to fabricate something when i get out there next week. I cant believe that all that is holding this air filter on the intake side is a simple hose clamp (pix from owner)!!




That's normal Aside from using a t-bolt clamp theres no other method of securing a filter to a turbo inlet.
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Old 04-26-2008, 11:27 AM
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As a related question to juicersr's question - how many of you guys that track your 930's simply have a filter off the turbo like that? I have mine routed up into the engine bay, but have been considering attaching mine to the turbo as pictured above.

Anyone had any issues doing that?

Brian
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Old 04-26-2008, 11:48 AM
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Quote:
Originally Posted by briankeithsmith View Post
As a related question to juicersr's question - how many of you guys that track your 930's simply have a filter off the turbo like that? I have mine routed up into the engine bay, but have been considering attaching mine to the turbo as pictured above.

Anyone had any issues doing that?

Brian
Hi Brian,
I've thought about doing the same thing. My air filter looks exactly like yours. I am woried about it falling off and a rock getting in there though. I sent you a PM about a Tec3r question.

Les
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Old 04-26-2008, 03:34 PM
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Quote:
Originally Posted by briankeithsmith View Post
As a related question to juicersr's question - how many of you guys that track your 930's simply have a filter off the turbo like that? I have mine routed up into the engine bay, but have been considering attaching mine to the turbo as pictured above.

Anyone had any issues doing that?

Brian
Unless their EFI converted then none. 930's draw air into the CIS fuel head first then into the turbo inlet. That's how they meter airflow to deliver the required fuel.
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Old 04-26-2008, 09:02 PM
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Yeah, I'm definitely NOT referring to a factory setup
EFI/3.2 Inake
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Old 04-27-2008, 07:07 AM
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Quote:
Originally Posted by BoxxerSix View Post
On average ~150-200 degrees of so, nothing you need to worry about melting rubber or anything.

BTW...a little water mist in the motor doesn't hurt anything. Think of it as a poor mans water injection system

Just buy a 3"-4" silicone transition coupler. They're only like $20 from most GOOD turbo shops online....check out www.vwturbo.com link to part is below


http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=ATP-SIL-053&Category_Code=SIL-TRN
DO NOT drive in the rain with a filter like you have there,period. Controlled water mist is fine but what happens when road dirt on the filter is carried through in the water? lt happened to me,sad to say and l found a thin film of grime throughout my entire intake system from turbo-pipes-intercooler-manifolds. This happend because l drove ONE TIME in the rain.Once that dirty water passes through the filter it brings dirt with it,remember it`s being sucked through there at high velocity,the real filtration stops when the filter gets wet. Get the right type of intake ducting from Aircraft Spruce,don`t use the aluminum stuff because it is just not up to the job. just my 2$ but from an engineering standpoint that filter location is total crap for anything but a dragracer.
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Old 04-27-2008, 12:49 PM
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Raceman, i had the same concerns. i will be using a combination of these boots and clamps and 3" aluminum tubing to bring the intake into the engine bay, similar to Brian. Think this will be ok?

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'79 930/934 replica
80 RSR-look(Now in Sicily)
914/6 2.7 (Projekt 908/3)
1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW
D-Zug Produkte/D-Zug.com
Old 04-27-2008, 01:21 PM
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l think you are right on the money with that set-up....thin wall alloy tubing? Don`t use the aluminum flex tube for anything but a very temporary solution,use the scat tubing instead.
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Old 04-28-2008, 09:28 AM
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l think you are right on the money with that set-up....thin wall alloy tubing? Don`t use the aluminum flex tube for anything but a very temporary solution,use the scat tubing instead.
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Old 04-28-2008, 09:50 AM
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That just might be the most **&^%ic filter setup I've ever seen.
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Old 04-28-2008, 11:04 PM
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whats your plan for getting the tubing up into the engine bay? is there anything blocking the old fresh air tubing hole located on the drivers side of the engine bay?
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Old 04-29-2008, 06:31 PM
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Quote:
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whats your plan for getting the tubing up into the engine bay? is there anything blocking the old fresh air tubing hole located on the drivers side of the engine bay?
Should be enought room to slip up a pipe past the engine support bar. Definitely going to require a hole saw to the rear tin or just remove it.
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Old 05-01-2008, 03:08 PM
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I'd go with a hole saw and then install a grommet or windlacing to protect the pipe.. You don't want to suck any more hot air in than you have to.

Quote:
Originally Posted by BoxxerSix View Post
Should be enought room to slip up a pipe past the engine support bar. Definitely going to require a hole saw to the rear tin or just remove it.
Old 05-01-2008, 05:04 PM
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