refresh951

Working on fabricating IC pipes and have a couple questions:

The stock intercooler inlet/outlet are about 2.40" in diameter, will a 2.5" silicone coupler work here?

The stock throttle body is about 2.85" in diameter, will a 3" silicone coupler work here?

TIA

CyCloNe!

Yes and Yes or a 2.75 coupler will stretch as well... also check this site out http://siliconeintakes.com/ that's where I get my couplers, fast shipping and good prices and quality.

refresh951

Thanks!

Yep, I had found Silicone Intakes and am buying most of my stuff from them.

Also found this aluminum 3" to 2.5" reducer to use at the throttle body on Ebay:

86 951 Driver

Are these cheaper than LR's?

Dave W.

I prefer to stretch a smaller size coupler over the pipe. It tends to seal better that squishing a large coupler onto a smaller pipe size. I used 2.25" couplers on the intercooler inlet/outlet and a 2.75" coupler on the throttle body.

refresh951

LR IC Pipes - $380
Self Fabricated IC Pipes - $70

Thanks Dave! Exactly the input I needed!

86 951 Driver

Sorry not the pipes, I was talking about the couplers.

Are you making the new IC pipes bigger than stock to free up any restrictions?

refresh951

Yes, new pipes will be 2.5" OD, 2.375" ID. Stock is about 2" ID. Also, less bends.

Dougs951S

I agree here, I used a 2.25-2.5 inch coupler on the intercooler inlet and a 2.75-2.5 coupler joining the compressor outlet to the pipe. Tighter is better and silicone is stretchy.

URG8RB8

Shawn:

Always check with Lart on stuff like this. I got a nice set from Lart, Kohlken's, polished, silicone couplings, T-bolt clamps. $150 delivered.

When you get over 20 psi highly recommend good clamps, spring loaded T-bolt should be used on compressor outlet.

http://www.turbohoses.com/Clamp.htm

Paulyy

IMO you don't need T-Bolt clamps if you've got beads on the pipes. If you've got good thick hose clamps, they wont come off.

The only time they'll come off if your couplers are rubbish and dont grip or you have no beads.

URG8RB8

I remove all normal hose clamps necessary or not. I don't like the look of them. Just look cheap to me and don't belong on a Porsche, even if they were OEM. Then again I am **** like that. I agree about the bead, but have seen many blow off with a bead and cheap clamps, not just Porsches either. Many Ricers at the drag strip have this happen. Some people also make the mistake of using a small amount of oil or grease to make undersize couplers slide on easier. Another big No No!

Paulyy

No, no grease. I've heard of people doing that. But that's asking for trouble.

The clamps I got with my SFR pipes are really good. nice, thick and can get done up tight.
Many people dont know this but you tighten them up with an 8mm socket not a screwdriver. you get more torque with a socket.

URG8RB8

I always use a socket, but you can also over tighten the clamp like this, probably better to use a torque wrench.

Paulyy

Generally the good clamps, you cannot over tighten. You can feel when it's tight. The **** clamps will bend and slip.