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#1
04-21-2009, 01:02 AM
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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) 
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#2
04-21-2009, 01:03 AM
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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!
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#3
04-21-2009, 04:32 AM
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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)
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#4
04-21-2009, 06:46 AM
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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
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#5
04-21-2009, 08:39 PM
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Yep, totally useless on a diesel except for S&G.
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#6
04-22-2009, 02:54 AM
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Quote:
__________________
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!@$$%) atleast the tranny was rebuilt.
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#7
04-22-2009, 03:06 AM
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Over speeding the turbo isn't very failsafe.
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#8
04-22-2009, 02:51 PM
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A blow off valve can be used on a diesel to reduce/eliminate surge during shifts. However if you don't have a problem with surge then it does you no good.
__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday  )(  Kalifornistani emissons  )white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank) desert storm primer 63 T-bird "The Undead" (long term hibernation) http://ecomodder.com/forum/fe-graphs/sig692a.png
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#9
04-23-2009, 06:17 AM
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Quote:
__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? As long as they would add one additional commandment for you to keep thy religion to thyself. George Carlin (Wonder where he is now..) 1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won. pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
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#10
04-23-2009, 07:39 AM
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God my wastegate sounds better than a ricer's blow of valve.Don't ask me how I did it,Forced will whip me.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran
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#11
04-23-2009, 09:20 AM
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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
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#12
04-23-2009, 12:39 PM
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Quote:
__________________
1984 300TD
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#13
04-23-2009, 06:50 PM
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Quote:
__________________
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
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#14
05-27-2009, 12:51 PM
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Quote:
IM me if you're afraid of Forced.
__________________
Cheers! Scott McPhee 1987 300D
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#15
05-27-2009, 01:39 PM
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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
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'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
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