Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion > Diesel Performance Tuning

Reply
 
LinkBack Thread Tools Display Modes
  #46  
Old 08-16-2008, 11:29 AM
Registered User
 
Join Date: Jul 2004
Posts: 7,381
I think 15-17 psi is about the max anyone that's modified a 617 runs. There may be a very small # of exceptions, but in order to use that extra psi you'll need to alot of things beforehand.

Reply With Quote
  #47  
Old 08-17-2008, 11:49 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,346
Anything over 20psi will require better valve springs.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42
Reply With Quote
  #48  
Old 08-25-2008, 06:17 AM
ForcedInduction
Guest
 
Posts: n/a
At least in the exhaust. Once you get over 30psi exhaust pressure the valves start to get pushed open.

Springs shouldn't be much of a problem to get if you want some. Take a pair to a performance shop (a real machine shop, not a ricer parts-swap shop) and see if they have or can make anything to match the spring rate needed.
Reply With Quote
  #49  
Old 08-25-2008, 05:21 PM
Registered User
 
Join Date: Apr 2005
Location: D.C.
Posts: 487
I'm running a Holset HX30 with wastegate that opened (when new) at 27psi. The gauge I currently have only goes to 16psi, but it goes waaay off the deep end of that one all the time... Maybe I should get a bigger gauge. Should I worry about my valve springs?
__________________
99 E300 Turbodiesel 100k
Reply With Quote
  #50  
Old 08-25-2008, 05:31 PM
bgkast's Avatar
Rollin' on 16s
 
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
I would look for a lighter wastegate, no way you need 27 psi of boost, and your turbine inlet pressure is probably around 50 psi.

You are likely floating your exhaust valves, which cause a power loss and can erode your valve seats.
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
Reply With Quote
  #51  
Old 08-25-2008, 08:20 PM
ForcedInduction
Guest
 
Posts: n/a
As well as piston-valve collision.
Reply With Quote
  #52  
Old 08-26-2008, 01:46 AM
DeliveryValve's Avatar
Chairman of my Benz
 
Join Date: Jun 2006
Location: Central California
Posts: 4,159
Is there any way of knowing that you are floating your valves from too much pressure?






In a side note I have to tell... this is the 1,500th post in this forum!
__________________
1983 123.133 California
- GreaseCar Veg System


Reply With Quote
  #53  
Old 08-26-2008, 02:00 AM
ForcedInduction
Guest
 
Posts: n/a
High RPM misfiring, black smoke or piston contact.
Reply With Quote
  #54  
Old 09-02-2008, 03:34 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,346
Baja,

I did some test fittings this weekend. How were you able to clock the turbo up and still use the stock diaphragm? Also what did you do for the oil lines? Also, did you use 2 of the accordians to fit the exhaust manifold up?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42
Reply With Quote
  #55  
Old 09-02-2008, 03:58 PM
Bajaman's Avatar
Registered User
 
Join Date: Mar 2005
Location: Bern, Switzerland
Posts: 713
Quote:
I did some test fittings this weekend. How were you able to clock the turbo up and still use the stock diaphragm?
Yes, but it was tight. Are you planning on using a 115 intake or modified 123 intake? Basically I clocked the compressor housing so that the actuator rod would just clear the oil supply, and adjusted accordingly. Also, my exhaust flange adapter was made of 3/4" so that gave me an extra 1/4" if your using a 1/2" adapter.
Quote:
Also what did you do for the oil lines?
I made my own with a combination of parts. I happened to have some 1/4" SS tubing with swagelock fittings. For the 12 mm banjo (oil filter end), I used an old one I had laying around and reworked the threads so that the swagelock fitting would thread on. The other end I welded a 3 AN fitting on and used this from there to the turbo
Quote:
Also, did you use 2 of the accordians to fit the exhaust manifold up?
No, just one and my adapter. There's a pic of the adapter early in the thread.

Unfortunately, something gave out yesterday, and now It sounds like there is air escaping somewhere when I get to about 12 psi. I thought at first that one of the hoses came off, but they are all intact. I haven't had time to pinpoint the problem yet.
__________________
For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel
Reply With Quote
  #56  
Old 09-15-2008, 09:00 AM
Bajaman's Avatar
Registered User
 
Join Date: Mar 2005
Location: Bern, Switzerland
Posts: 713
I finally got around to finding the problem. Turns out I developed a hole in the resonator. I have never heard this type of sound coming from an exhaust before, just like air coming from a spray nozzle... I was driving myself nuts trying to find a problem in the intake. I replaced the resonator with a straight pipe, and can tell no difference in noise level.
__________________
For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel
Reply With Quote
  #57  
Old 09-15-2008, 02:25 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,346
So the 10mm hole is the fill side and the flange side is the drain?

Whats the blue hose to copper line for in the pics?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42
Reply With Quote
  #58  
Old 09-16-2008, 12:02 AM
Registered User
 
Join Date: Apr 2005
Location: D.C.
Posts: 487
Well, you guys scared me, especially forced talking about black smoke, high rpm misfiring, and bashing holes in pistons, so I guess I'll turn the boost down to 15-17psi from the 20-25psi its been running.. Although I haven't had any complaints from the engine pulling 23ish psi at 4800rpm... yet... although your points are all well-taken, and the extra stress is not productive as far as the engine is concerned. Sorry to jump in with a side topic.

BTW: What might tighter valve springs do as far as cam wear is concerned?
__________________
99 E300 Turbodiesel 100k
Reply With Quote
  #59  
Old 09-16-2008, 10:45 AM
Bajaman's Avatar
Registered User
 
Join Date: Mar 2005
Location: Bern, Switzerland
Posts: 713
Quote:
Originally Posted by winmutt View Post
So the 10mm hole is the fill side and the flange side is the drain?
correct
Quote:
Originally Posted by winmutt View Post
Whats the blue hose to copper line for in the pics?
That's for measuring exhaust pressure. I wouldn't worry about it if I were you.
__________________
For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel
Reply With Quote
  #60  
Old 02-02-2009, 07:48 PM
b100 maker
 
Join Date: Mar 2007
Location: bishop cailforina
Posts: 3
what manifold is that?

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 01:29 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page