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1 x 1/8" NPT 1/4" Barbed Nipple (Male Fitting)
1 x 1/8" NPT 1/4" Barbed Nipple (Female Fitting)
1 x 3/16" Ball Bearing
1 x Utility Spring
2 x 1/2" Hose Clamps
The barbed fittings are used from compressors, but you should screw them onto each other so that you have a nipple on each end. The spring and ball bearing go inside so that essentially the spring presses on the ball bearing firmly against the inside of one of the fittings to seal the hole off. If the spring is too short, you can pull on it to make it a little bit longer, but if its too long, you can cut a big of the spring off, enough so that the spring presses against the fitting. Once everything is in together, you will be able to adjust the boost by simply turning the fittings together. this is an effective way to manipulate boost manually, all for under 5$
You could also go to Harbor Freight and buy an air regulator for ~$3 and the same two male and female barbed nipples for ~$.99 each, thread one on to each side and there you go.
Try using a stiffer spring and readjust the fittings for the same boost. This should give you smoother open/close of the mbc. Also make sure the surface the ball is pressing against inside the fitting is clean and smooth. If it's dinged up or rough at all use a tapered honing stone (like the ones you use in a dremmel tool) to clean it up, or better yet, jsut go back to the hardware store and buy one that has a nice clean finish inside.
Quote:
Originally Posted by NZ_GTiR
Made this one today.. Very good idea and I see how it works, but, I got really bad boost spiking..
Wastegate = 7psi, and I slowly up'd the boost with the homemade mbc,
Spike to 10, back down to 7-8 ish
spike to 13, back down to 7-9 ish
Spike to 16, back down to 7-9 ish
Just wanted a feel for the car at higher boost before putting the avcr in. Im thinking about selling the car and dont want to put the avcr in unless I decide to keep it.. If that makes sense lol
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