Boost Control Solenoid restrictor
Dec 6, 2003 | 06:55 AM
#78
Originally posted by Dr Evo
I took my restrictor out, my only concern is how would I know if detonation is happening? What does it sound like?
I took my restrictor out, my only concern is how would I know if detonation is happening? What does it sound like?
Apr 18, 2004 | 07:23 PM
#79
I took mine out today.. kinda a pain in the *** to get it out of the hose..
Spikes to 1.5 bar now.. pulls hard but noticed the hood felt pretty warm after a drive.. could be the warm weather that is finally here..
putting it back in tomorrow just to be safe..
Spikes to 1.5 bar now.. pulls hard but noticed the hood felt pretty warm after a drive.. could be the warm weather that is finally here..
putting it back in tomorrow just to be safe..
Apr 22, 2004 | 10:11 AM
#81
The one by the solenoid is big end towards solenoid and small end towards wastegate, but I don't think it really matters if it's the other way. Probably just the way it was installed in the hose when they are made that's all.
Apr 22, 2004 | 10:55 AM
#82
Originally posted by timzcat
The one by the solenoid is big end towards solenoid and small end towards wastegate, but I don't think it really matters if it's the other way. Probably just the way it was installed in the hose when they are made that's all.
The one by the solenoid is big end towards solenoid and small end towards wastegate, but I don't think it really matters if it's the other way. Probably just the way it was installed in the hose when they are made that's all.
Nov 2, 2004 | 06:24 PM
#83
Took mine out last night. Same results as most people are reporting spike to 21 psi then tapering down to 18-19psi. This is good... The bad thing is that at times the boost will only hit 10psi or so. Why so inconsistent?
I plan on installing my MBC very soon so I can hopefully have a constant 19 psi all the way through.
I plan on installing my MBC very soon so I can hopefully have a constant 19 psi all the way through.
Apr 27, 2005 | 07:13 AM
#84
Newbie
Joined: May 2004
Posts: 6
Likes: 0
restrictor pill
Originally Posted by timzcat
It still seems to be unclear to some about the boost control restrictor. There is a brass restrictor in the boost controller hose that goes to the wastegate. It is approximately 1" or so from where the hose connects to the controller.
Below is a pic of the restrictor, given it is so small it is difficult to photograph. The result was a spike to 21.5 (maybe 22) and it tapers down to 18 and holds at 18 all the way to 7000 RPM. This is with a 3" DP and stock exhaust. As soon as I get the exhaust on it may go higher.
Next plan is to enlarge the restrictor. It currently fits a 1/8 drill bit perfectly. I am going to use a 5/32 bit to open up the hole and test it on the car. Looks like 5/32 is the only upsize that will work.
Below is a pic of the restrictor, given it is so small it is difficult to photograph. The result was a spike to 21.5 (maybe 22) and it tapers down to 18 and holds at 18 all the way to 7000 RPM. This is with a 3" DP and stock exhaust. As soon as I get the exhaust on it may go higher.
Next plan is to enlarge the restrictor. It currently fits a 1/8 drill bit perfectly. I am going to use a 5/32 bit to open up the hole and test it on the car. Looks like 5/32 is the only upsize that will work.
Jul 25, 2005 | 05:04 PM
#86
BTW... to anyone who wants to take their stock restrictor and drill it out to 5/64 like timzcat...i just struggled for a while trying to do that and then it hit me APPLY WD-40 OR ANOTHER LUBRICANT ONTO THE INSIDE OF THE PILL!!! After that it took me about 10 seconds to drill though by putting the wide end onto the drill bit and pulling on it gently with some pliers.
Apr 30, 2006 | 11:12 PM
#88
Newbie
Joined: Apr 2006
Posts: 25
Likes: 0
From: AUCKLAND NZ
Hi guys, I know this is getting boring but!! I have a new Jap import E9 2006 had 30km so unmodified in Japan. (Car is now in NZ)
Mine most defiantly has to restrictor pills next to what appear to be two boost control solenoids (stacked one on top of the other)!!! There are two BCS and a hose from each that tee them together see pic hoses with the clamps. There is also a vent tube from each solenoid and a tee joining them before they feed back to the intake pipe. In the pics attached I have put white tape where the restrictors were. Question, did I do the right thing removing both these restrictors, as they are both in the same loop of hose. Car feels good without them, but mine has no boost gauge yet!! So I can’t see boost level.
Cheers
Darren
Mine most defiantly has to restrictor pills next to what appear to be two boost control solenoids (stacked one on top of the other)!!! There are two BCS and a hose from each that tee them together see pic hoses with the clamps. There is also a vent tube from each solenoid and a tee joining them before they feed back to the intake pipe. In the pics attached I have put white tape where the restrictors were. Question, did I do the right thing removing both these restrictors, as they are both in the same loop of hose. Car feels good without them, but mine has no boost gauge yet!! So I can’t see boost level.
Cheers
Darren
Last edited by sales@fastcraft; May 1, 2006 at 11:46 PM.
Aug 9, 2007 | 06:51 PM
#90
i know this is old post but 4 years later, i am sitting here at 10PM and want to drill the restrictor pill that you are talking about with 9/64 and unless i am missing something its impossible. the diameter of drill bit is larger than that of the restrictor pill so hw can you drill it?
EDIT i guess i should have read the post, 5/64 is what i want
EDIT i guess i should have read the post, 5/64 is what i want
Well at 5/32 it looks like I am getting 20.5 to 21.0 for the surge and then it drops down to 18.5. Remember I have a 3"DP too so that has some affect. I deally I'd like to see what a 9/64 hole would do but that is not a very common drill bit and I can't drill smaller now. 
As far as I can tell that is the only restrictor in the lines.
If anyone decides to attempt this mod, be sure and be careful with the restrictor when drilling it out. I basically used a pair of pliers to hold it. Wasn't easy but I didn't over squeeze it and collapse it so it was worth the hassle. Once drilled you could definitely collapse it, but I am not talking fragile.
I drove it a bit and have a really good idea where it's at. The peak is the hardest to see cause I still have to watch the road. If I find any variation in these numbers while driving tomorrow, I will update the post.
As far as I can tell that is the only restrictor in the lines.
If anyone decides to attempt this mod, be sure and be careful with the restrictor when drilling it out. I basically used a pair of pliers to hold it. Wasn't easy but I didn't over squeeze it and collapse it so it was worth the hassle. Once drilled you could definitely collapse it, but I am not talking fragile.
I drove it a bit and have a really good idea where it's at. The peak is the hardest to see cause I still have to watch the road.
If I find any variation in these numbers while driving tomorrow, I will update the post.Last edited by pltek; Aug 9, 2007 at 07:32 PM.