Fuel Pressure Relief Valve
Fuel Pressure Relief Valve
01-30-2009, 11:29 PM
#1
'78 300D, OM617.912: 4spd manual, TB03 at 10PSI, 26*BTDC, DV's turned, HVAC, emissions system removed, e-fan, short ram, 3" downpipe to straight exhaust, W126 Bendix brakes, MR2 Spyder seats. 2890lbs
I finally got around to doing this to mine in addition to stretching the pressure relief spring to 28mm. I'm amazed how much a power increase this made. Too bad the trans can't take it. Time for the 4spd swap!
'78 300D, OM617.912: 4spd manual, TB03 at 10PSI, 26*BTDC, DV's turned, HVAC, emissions system removed, e-fan, short ram, 3" downpipe to straight exhaust, W126 Bendix brakes, MR2 Spyder seats. 2890lbs
01-31-2009, 09:12 AM
#2
(01-30-2009, 11:29 PM)kamel I finally got around to doing this to mine in addition to stretching the pressure relief spring to 28mm. I'm amazed how much a power increase this made. Too bad the trans can't take it. Time for the 4spd swap!
Is your tranny slipping?
This is a good indication that power increased.
No problem, just increase the modulating pressure (T-pin on driver side of the tranny).
Tom
(01-30-2009, 11:29 PM)kamel I finally got around to doing this to mine in addition to stretching the pressure relief spring to 28mm. I'm amazed how much a power increase this made. Too bad the trans can't take it. Time for the 4spd swap!
Is your tranny slipping?
This is a good indication that power increased.
No problem, just increase the modulating pressure (T-pin on driver side of the tranny).
Tom
01-31-2009, 03:58 PM
#3
'78 300D, OM617.912: 4spd manual, TB03 at 10PSI, 26*BTDC, DV's turned, HVAC, emissions system removed, e-fan, short ram, 3" downpipe to straight exhaust, W126 Bendix brakes, MR2 Spyder seats. 2890lbs
I can only give it 1/4 throttle before it slips. I used to be able to floor it everywhere prior to adjustments, unless it was on a hill. Is there anychance the slipping could be from a vacuum leak?
'78 300D, OM617.912: 4spd manual, TB03 at 10PSI, 26*BTDC, DV's turned, HVAC, emissions system removed, e-fan, short ram, 3" downpipe to straight exhaust, W126 Bendix brakes, MR2 Spyder seats. 2890lbs
02-01-2009, 12:54 AM
#4
(01-31-2009, 03:58 PM)kamel I can only give it 1/4 throttle before it slips. I used to be able to floor it everywhere prior to adjustments, unless it was on a hill. Is there anychance the slipping could be from a vacuum leak?
No not vacuum, modulating pressure!
Do a search for modulator tranny.
On the driver side there is the (green) modulator. Remove the rubber cap, pull out the T-metal thing and turn it. Do a search for the direction.
Even better check the modulator pressure at the check port to know where you are.
Do it immediately, don't let it slip, this will eat up your clutches within short time.
Tom
(01-31-2009, 03:58 PM)kamel I can only give it 1/4 throttle before it slips. I used to be able to floor it everywhere prior to adjustments, unless it was on a hill. Is there anychance the slipping could be from a vacuum leak?
No not vacuum, modulating pressure!
Do a search for modulator tranny.
On the driver side there is the (green) modulator. Remove the rubber cap, pull out the T-metal thing and turn it. Do a search for the direction.
Even better check the modulator pressure at the check port to know where you are.
Do it immediately, don't let it slip, this will eat up your clutches within short time.
Tom
02-01-2009, 07:24 PM
#5
(01-30-2009, 11:29 PM)kamel I finally got around to doing this to mine in addition to stretching the pressure relief spring to 28mm. I'm amazed how much a power increase this made. Too bad the trans can't take it. Time for the 4spd swap!
What is this relief spring to stretch? Hmm...
Lincolnlock
02-01-2009, 07:24 PM #5(01-30-2009, 11:29 PM)kamel I finally got around to doing this to mine in addition to stretching the pressure relief spring to 28mm. I'm amazed how much a power increase this made. Too bad the trans can't take it. Time for the 4spd swap!
What is this relief spring to stretch? Hmm...
02-02-2009, 09:03 PM
#6
'78 300D, OM617.912: 4spd manual, TB03 at 10PSI, 26*BTDC, DV's turned, HVAC, emissions system removed, e-fan, short ram, 3" downpipe to straight exhaust, W126 Bendix brakes, MR2 Spyder seats. 2890lbs
That's what it's called? Still makes a difference. I did the stretch before the dv holders so I could see what each of them did. The DV holders definately made more of a power increase, but the spring made it bog down less on hills and more midrange power. The holders made more power all accross the board!
'78 300D, OM617.912: 4spd manual, TB03 at 10PSI, 26*BTDC, DV's turned, HVAC, emissions system removed, e-fan, short ram, 3" downpipe to straight exhaust, W126 Bendix brakes, MR2 Spyder seats. 2890lbs
12-28-2009, 12:10 PM
#7
The relief valve is #13 in the picture.
This post was last modified: 12-28-2009, 12:12 PM by ForcedInduction.
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12-28-2009, 12:10 PM
#7
Bump for Benzworld PM.
The relief valve is #13 in the picture.
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