$4.00 boost control - D-series.org

Go Back   D-series.org D-series Knowledge Factory DIY Forum

D-Series.org is the premier Honda All Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 11-24-2003, 01:20 PM   #1 (permalink)
Posts: n/a


1 x 1/8" NPT 1/4" Barbed Nipple (Male Fitting) - $1.00
1 x 1/8" NPT 1/4" Barbed Nipple (Female Fitting) - $1.00
1 x 3/16" Ball Bearing - $0.15
1 x Utility Spring - $0.30
2 x 1/2" Hose Clamps - $0.75


The barbed fittings you get should screw onto each other in opposite directions with a nipple on each end... You will essentially place the spring and ball bearing inside the fittings in such a way so that the spring presses the ball bearing firmly against the inside of the fitting to seal the hole off.

If the spring is too short then you may need to pull on it and stretch it longer. If its too long then just cut a bit of the spring off. The spring should press the ball firmly into the seat when you assemble the two barbed fittings together.

Also, you might want to flare out the ends of the spring so that is 'cups' the ball on one end and so that it can not press itself through the nipple on the other.

Then once you got it all working correctly, you should be able to adjust the boost by the amount of turns you screw the fittings together, you can test this, but blowing in the nipple that has the ball bearing pressed against it. If you can blow through, then keep blowing while turning the fittings and you should feel the ball pressing tighter and it gets harder and harder to blow through until finally you can't blow through any more..

Also, the fittings are pipe threads too, so at some point you'll need to get a wrench out to tighten it further...


To install it, make sure you have the ball bearing side towards the manifold or VAC source and the spring side towards the wastegate, so that the boosted air PUSHES on the ball bearing.

Use mini clamps and clamp it down tight and your good to go..

Start off with the fittings screwed in loose so that you can blow through it yourself, then take it for a drive, slowly tighten it up until you get the boost you want and you're set!

If you tighten the fittings as much as you can and your still not getting enough boost, then just take it apart, and pull on the spring to make it longer, that way it'll push harder on the ball bearing.
  Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the D-series.org forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

iconAll times are GMT -8. The time now is 12:03 PM. | Welcome to Forum, please register to access all of our features.