My car gives me 9 psi. The low end and midrange is much nicer. It is starting to run pretty well. I want to get a bit more out of for those times I might be passing on a two lane road.

I have seen the manual boost controllers they are very inexpensive Mine is even less expensive. What fun is it to buy one when you can make it.

Here

I am going to test the pressure that it builds and either increase or decrease the spring tension. I also need to drill a small bleed hole on the waste gate side of the valve to relieve the pressure once the foot feed is let off.
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I am using a chrome plated round head screw as a valve. With the brass body as the seat. It is what I had handy

I will be sure to follow up.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

I just gave it a test. It levels off now a 13.5 psi. A bit higher than spec.
Noticable improvement in acceleration. I might try a small added shim.

I wouldn't attempt to do this without a pressure gauge.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

I took a ball valve and reduced it to 3/8s

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

While I admire the inventiveness and fabrication if you had to go out and buy the Brass Fittings and other parts; you could likey buy yourself a New Adjustable Boost Controler on eBay with Free Shipping for about $15.

Several years ago they were around $10 but the price has crept up.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

I bought one of those! It was about $10 I think! Cheap and works well for me

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
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93 300E 195k

I have about 8.50 in mine. I had to buy the brass but had the spring and valve. Cost is not the primary reason I built it myself.

The spring I used came from a spare spring from my reloader. I think the screw (used as a valve) came from a bicycle water bottle mount. I switched the back side spacer to a bike spoke nipple. Reducing the preload on the spring. I have it torqued all down, tightening the spring and didn't want to raise the relief pressure.

I knew I was going to get comments like "You can buy one " But I wouldn't be able have in operation in a few hours. Would lose the thrill of making myself. Also I would need to use paypal....Not for me if I can help it.

Old Sinner, The only kind of ball valves that I am familiar with have a handle and are quarter turn.

All this work on the Benz turbo has made me curious about the settings on my vw. I have never check them.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

I had a ball valve two bucks for fittings

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

Here is mine all buttoned up. Note the .041" bleed hole at the top. I am not convinced that is necessary but I only had the connections hand tight on my trial run and I am sure I was getting a bit of leakage between the fittings.


The intake manifold hooks to the bottom and the side port is hooked to the waste gate controller.

Oldsinner I am still having difficulty with visualizing your check valve. Are you just bleeding off pressure all the time?

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

looks good

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

LOL I'm sure it does but the big BOOST CONTROLLER HIGH PERFORMANCE decal is kind of on the Fast n'Furious side for some of us

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

Yep, I bought one several Years ago and it is the more complete Kit that the one that is $15 now.

I have never connected it as I have never set up anything to check My Boost. The Kit I have comes with a T fitting so you can connect a Boost Gauge more easily.
I am actually OK with My Cars performance but at some point I am going to get curious and will hook that stuff up.

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84 300D, 82 Volvo 244Gl Diesel

Third time is the charm. I ran it after reducing the tension and got a max of 11. 13 felt a lot better. Brought it back up. Will boost to 13 in 2nd and ~14 in third. I am leaving it like that.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

Diesel 911. I am sure you have done the math. Normal sea level pressure is ~14.7 psi. So if you have 9 it is like it is running at 23.7 and if you have a boost of 14 you have 28.7 Of course there is heat to contend with. I don't plan on using mine full out much as I generally don't drive that way and the mod doesn't affect the way it runs on cruise. It is like having a 5800 cc NA diesel at least for a few seconds, until the intake charge heats up.

Why the positive comments German Star? I don't see much in the way of down side. Saved some busted knuckles by not having to tune the waste gate directly.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

Actually I was not even curious on the Math. Never thought to figure it out.

I think the ones that have exhaust heat issues or the ones who remove the ALDA completey and run the Turbo at a higher than spec boost.

If someone lived at a high Altitude the extra boost could be a help.

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84 300D, 82 Volvo 244Gl Diesel

I think there is at least 4 Members who have bought them;this is the first complaint I have read.
I fact I learned about them and that they were sold on eBay on this forum.

It is way too late as I bought bought mine over 3 years ago and it is still in the Zip Lock Bag. I am not sure what I did with the Silicon Vacuum Hose that came with it.
The Kit that I have is selling for $17+ on eBay.

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84 300D, 82 Volvo 244Gl Diesel