9 psi max boost - Page 5 - PeachParts Mercedes-Benz Forum

47dodge · #61 05-01-2011, 12:05 PM

I'll look at my spare(garrett) and see if I can come up with some ideas. I am lucky my 300 has the kkk turbo, nice and easy to adjust. This is really a parts car at this point though.

funola · #62 05-02-2011, 08:19 PM

I made a wastegate cover coil spring eliminator. I had a junk turbo as a model for the mockup. I'll never have to fight with that spring ever again.

Four screws gets the cover off!

I tried again to get the spring off the turbo in the car but no luck. I think I am gonna have to pulll the turbo. Will I run into any problems such as rusted exh manifold bolts or something else? Will I need a new exh manifold gasket or can I use the same one?

funola · #63 05-03-2011, 04:16 PM

I was about to pull the turbo when I gave it one last try. I sharpened a small screwdriver to a chisel point, shoved it under the spring to lift it and bent it a little so the tip is sticking up enough to grab it with a long nose and yanked it off. I didn't care if it got mangled since I have the spring eliminator.

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Mangled spring laying on coolant hose. 13 mm wrench adjusting wastegate.

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Here it is installed and back together.

funola · #64 05-03-2011, 04:23 PM

I've already adjusted it twice and can't imagine doing it without the spring eliminator, which take 10 minutes start to finish. I don't even have to take hose off the nipple.

Here's a video of the boost at 11 psi. I have to tweak it one more time to get it to 12 psi. The white boost gauge is 0 to 15 psi, o is at 7 o'clock and 15 is at 5 o'clock, where the needle tops out is about 11 psi.
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CLICK TO PLAY!

47dodge · #65 05-03-2011, 06:49 PM

I just took some pictures, with the ring removed, and of the ring. Mine was not rusty so it came off easy. Guess you don't need the pictures now. Glad to here you got it.

funola · #66 05-04-2011, 08:58 AM

I would like to see it. Please post them.

Quote:

Originally Posted by 47dodge

I just took some pictures, with the ring removed, and of the ring. Mine was not rusty so it came off easy. Guess you don't need the pictures now. Glad to here you got it.

funola · #67 05-04-2011, 05:21 PM

I adjusted the wastgate one more time. It is now maxed out and I can only get up to 11.5 psi. I suppose the spring is weakened by age and I can shim it with a spacer to get more boost? Is it worth my while to go through the trouble get another 0.5 psi? Frankly, I do not feel any seat of the pants difference going from 9 to 11 psi. Maybe I need to adjust the ALDA better to get the correct balance between fuel and boost? How would I do that?

47dodge · #68 05-04-2011, 08:09 PM

for now I would not try to get more boost. Alda has a sealing cap to prevent tampering, pry this off. Loosen nut, and turn the set screw counterclockwise to bring fuel on sooner. Might as well just max it out. If it makes smoke then back off a little. Not likely to make smoke though. You may see some increase in boost, or boost coming on earlier.

47dodge · #69 05-04-2011, 08:15 PM

here are the pictures. One shows the ring off. it is a bit hard to tell but the end of the ring should have a "tang" the a screwdriver can get under. Other picture is of the adjustments(wastegate) after the cover is off.

47dodge · #70 05-04-2011, 08:18 PM

ok think this is it.

funola · #71 05-04-2011, 10:34 PM

47dodge, was the motor where you took the spring off the turbo installed in a car? I think it makes a world of difference if it was out of the car so you can see what you are doing and have better access. Did you try putting the spring back? That's harder than taking it off. I would also like to hear from those who have R&R'ed the spring with the turbo in the car, tools you used and how you did it.

I can envision a removal tool that is a ring just big enough to allow the spring to go inside it. This ring is on a short shaft attached to a handle. The ring would have a sharpened chisel edge which allow you to easily "catch" the tang, encircling it and allow you to lift the tang and slide it along the spring's circumference and get it off easily.

47dodge · #72 05-05-2011, 06:44 PM

yes turbo is in the car still. I used a very small screw driver to pick the tang, and another small screwdriver to peel it out. Goes back in easy, as long as you put one end in then sort of roll it in a bit at a time. I have never liked this type of ring, a regular snap ring with the two holes for a snap ring pliers would be better.

funola · #73 05-06-2011, 07:48 AM

Quote:

Originally Posted by 47dodge

yes turbo is in the car still. I used a very small screw driver to pick the tang, and another small screwdriver to peel it out. Goes back in easy, as long as you put one end in then sort of roll it in a bit at a time. I have never liked this type of ring, a regular snap ring with the two holes for a snap ring pliers would be better.

That is amazing! What o'clock position was your tang? I tried picking it with a screwdriver similar to the one in your pic and the tang just keeps popping off. I must be a real klutz!

So you have taken the spring off and put it back it with the motor still in the car? How about doing it again but shoot a video this time? It will be useful to show the correct technique many have struggled with.

47dodge · #74 05-06-2011, 06:17 PM

it was about 6 o'clock. I do not have a video camara, sorry. By the way the screwdriver in the picture is far too big and blunt. The screwdriver I used has a blade about 1/8" wide, and you need two of them. Just get the tang up slightly, only enough to get the second screwdriver next to the first one.then rebite the first. It is much like changing a tire, manually.

funola · #75 05-07-2011, 09:37 AM

Interesting your tang is at 6 o'clock, which gives better access..

Both turbos that I have has the tang at 12 o'clock, which means working blind and the inlet housing is in the way of prying.
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The engine is running well. I'll have to do some 0-60 runs to see if it runs any faster with the 2.5 psi higher boost.