Boost/Vac line size????
05-21-2003, 11:02 AM
#1
Drive-by provocation guy
Rennlist Member
Rennlist Member
Thread Starter
Join Date: Apr 2002
Location: NAS PAX River, by way of Orlando
Posts: 10,439
Likes: 0
Received 0 Likes
on
0 Posts
Boost/Vac line size????
How would boost be affected by running smaller or bigger boost/vac lines???
05-21-2003, 01:24 PM
#2
Race Director
You want a small-diameter line with a stiff hose. The thin silicon hose a lot of people use are not appropriate because the hose will expand when the boost-controller sends pressure to the wastegate to dump boost. The wastegate will only open when the hose has stopped expanding, so you get a boost-spike. The proper hose to get is something with thick walls, like the original rubber hose. You want a hose that has at least a 3mm wall-thickness.
05-21-2003, 04:21 PM
#4
Burning Brakes
Join Date: Aug 2002
Location: Fort Lauderdale, Florida
Posts: 982
Likes: 0
Received 1 Like
on
1 Post
Does anyone have a list of all the vacuum hoses dimensions and lengths? I want to replace all of mine but don't want to have to buy a caliper and go to town measuring. 
A good(read cheap) place to buy lines from would be nice too. Color doesn't matter, in fact black would be kinda nice.
A good(read cheap) place to buy lines from would be nice too. Color doesn't matter, in fact black would be kinda nice.
05-21-2003, 05:46 PM
#5
Drive-by provocation guy
Rennlist Member
Rennlist Member
Thread Starter
Join Date: Apr 2002
Location: NAS PAX River, by way of Orlando
Posts: 10,439
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the info Danno, as I think a lot of people in here have or have considered the silicon after market lines.
I know the tubing that comes with the autometer boost guage is smaller than stock, not sure about ID vs. OD though.
So what would happen with a smaller dia. than stock line??? If you could even find that type of tubing
I know the tubing that comes with the autometer boost guage is smaller than stock, not sure about ID vs. OD though.
So what would happen with a smaller dia. than stock line??? If you could even find that type of tubing
05-22-2003, 02:50 PM
#7
Race Director
"I know the tubing that comes with the autometer boost guage is smaller than stock, not sure about ID vs. OD though."
A lot of the boost-gauges come with a hard plastic line like the KLR, but with a smaller 1.5mm ID. This just reduces the volume that has to flow before pressure-changes appear at the other end. Remember that a boost-gauge is a dead-end, there's no continous flow in the line.
Those popular thin silicone hoses are fine for the vacuum lines like the FPR, fuel-dampener, BOV and that funky rabbit-ear vavle. But you want to use a thicker hose for the wastegate. The stock rubber line coming out of the banjo-bolt at the intercooler pipe is about right. Here's a picture of our ReliaBoost controller installed:
<img src="http://img.villagephotos.com/p/2003-5/144622/ReliaBoostInstalled.jpg" alt=" - " />
A lot of the boost-gauges come with a hard plastic line like the KLR, but with a smaller 1.5mm ID. This just reduces the volume that has to flow before pressure-changes appear at the other end. Remember that a boost-gauge is a dead-end, there's no continous flow in the line.
Those popular thin silicone hoses are fine for the vacuum lines like the FPR, fuel-dampener, BOV and that funky rabbit-ear vavle. But you want to use a thicker hose for the wastegate. The stock rubber line coming out of the banjo-bolt at the intercooler pipe is about right. Here's a picture of our ReliaBoost controller installed:
<img src="http://img.villagephotos.com/p/2003-5/144622/ReliaBoostInstalled.jpg" alt=" - " />