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
  #1  
Old 04-21-2009, 01:02 AM
Registered User
 
Join Date: Jul 2007
Location: chicago area, illinois
Posts: 281
blow off valve

can i put a blow off valve on on my 85 300dt and where would it go if i could put one on there?

__________________
1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)
Reply With Quote
  #2  
Old 04-21-2009, 01:03 AM
300SD81's Avatar
1981 Mercedes-Benz 300SD
 
Join Date: Aug 2006
Location: University of Georgia
Posts: 1,082
not needed on a diesel, theres no throttle plate.
__________________
Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!
Reply With Quote
  #3  
Old 04-21-2009, 04:32 AM
Registered User
 
Join Date: Jul 2007
Location: chicago area, illinois
Posts: 281
ahhh i c.... im looking at a used intercooler and the one i am bidding on has a port on it for a blow off valve, should i just block it off then?
__________________
1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)
Reply With Quote
  #4  
Old 04-21-2009, 06:46 AM
lowriderdog37's Avatar
Unregistered User
 
Join Date: Mar 2007
Location: Viera, FL
Posts: 665
Yeah, without the throttle plate, it will just sit there doing nothing. You could add one, but it will only be detrimental to your boost.

It would be pretty cool though to have one hooked up to a duck call for $hits & gigs. I was thinking about doing it for a while, but no.
__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior
Reply With Quote
  #5  
Old 04-21-2009, 08:39 PM
ForcedInduction
Guest
 
Posts: n/a
Yep, totally useless on a diesel except for S&G.
Reply With Quote
  #6  
Old 04-22-2009, 02:54 AM
Cervan's Avatar
Crazy mechanic.
 
Join Date: Jan 2007
Location: olympia washington
Posts: 1,809
Quote:
Originally Posted by ForcedInduction View Post
Yep, totally useless on a diesel except for S&G.
How about to regulate pressure? sort of like a failsafe.
__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
Reply With Quote
  #7  
Old 04-22-2009, 03:06 AM
ForcedInduction
Guest
 
Posts: n/a
Over speeding the turbo isn't very failsafe.
Reply With Quote
  #8  
Old 04-22-2009, 02:51 PM
ConnClark's Avatar
Power User
 
Join Date: Nov 2005
Posts: 1,121
A blow off valve can be used on a diesel to reduce/eliminate surge during shifts. However if you don't have a problem with surge then it does you no good.
__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png
Reply With Quote
  #9  
Old 04-23-2009, 06:17 AM
Cervan's Avatar
Crazy mechanic.
 
Join Date: Jan 2007
Location: olympia washington
Posts: 1,809
Quote:
Originally Posted by ForcedInduction View Post
Over speeding the turbo isn't very failsafe.
pick your poison.
__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
Reply With Quote
  #10  
Old 04-23-2009, 07:39 AM
oldsinner111's Avatar
once a happy man
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,781
God my wastegate sounds better than a ricer's blow of valve.Don't ask me how I did it,Forced will whip me.
__________________
come on people now,smile on your bro,everybody get together
Reply With Quote
  #11  
Old 04-23-2009, 09:20 AM
Simpler=Better's Avatar
Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
Posts: 2,544
Did you cut into the turbo's housing so that the wastegate vents directly to atmosphere?
__________________
$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment
Reply With Quote
  #12  
Old 04-23-2009, 12:39 PM
OldPokey's Avatar
0-60 in 10 minutes flat
 
Join Date: Sep 2006
Location: Middletown MD
Posts: 527
Quote:
Originally Posted by lowriderdog37 View Post
It would be pretty cool though to have one hooked up to a duck call for $hits & gigs. I was thinking about doing it for a while, but no.
I would use a whoopee cushion - maybe both?
__________________
1984 300TD

Reply With Quote
  #13  
Old 04-23-2009, 06:50 PM
lowriderdog37's Avatar
Unregistered User
 
Join Date: Mar 2007
Location: Viera, FL
Posts: 665
Quote:
Originally Posted by OldPokey View Post
I would use a whoopee cushion - maybe both?
HA! That would be great too!
__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior
Reply With Quote
  #14  
Old 05-27-2009, 12:51 PM
scottmcphee's Avatar
1987 w124 300D
 
Join Date: Mar 2008
Location: Edmonton, Canada
Posts: 1,539
Quote:
Originally Posted by oldsinner111 View Post
God my wastegate sounds better than a ricer's blow of valve.Don't ask me how I did it,Forced will whip me.
How did you do it, and was there any performance change?
IM me if you're afraid of Forced.
__________________
Cheers!
Scott McPhee

1987 300D
Reply With Quote
  #15  
Old 05-27-2009, 01:39 PM
Registered User
 
Join Date: Apr 2009
Location: Wisconsin (Columbia County)
Posts: 25
BD offers a product called the Turbo Guard. It's really overpriced...but a bolt-on affair.

Mildly modified Cummins B5.9's frequently see 50psi+...going from that much boost back to idle is a really nasty transition that places the bearings in the turbo in an unfair sitation. Over time, these bearings will wear out prematurely. By relieving the pressure seen when the soot pedal is lifted and the engine is returning back to idle, your turbo will live longer - maybe.

I've seen a few kits out there and they do work as advertised. The need for these is real for those making frequent trips between 0 and 50psi...like with a manual transmission between gears.

Cheers,

Matt

__________________
'99 W210/OM606.962 - bone stock for now.
'94 Dodge/Cummins - NV5600, P7100, ~400hp
'96 Jeep ZJ - Cummins ISB 170/Allison LCT-1000 conversion project basket case
'00 VW Jedi - 345k, bone stock
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 08:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page