alesak Posted August 22, 2019 Share Posted August 22, 2019 Good morning folks,as shown in pics, i found 4 vacuum takeoffs, 2 in trumpet base and 2 in plenum.Take off nr. 1, left hand side of the plenum: unknown, maybe is part of idle circuit?Take off nr. 2, left hand side of the plenum: connection of the PCV system, left hand bankTake off nr. 3, left hand side of the trumpet base: connection to fuel pressure regulatorTake off nr. 4, right hand side of the trumpet base: probably is the other connection to the PCV system, right hand bank where oil separator is fitted.I can't find the connection for vacuum brake booster... Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 22, 2019 Share Posted August 22, 2019 There is no brake booster take off on these, all the P3 V8 Range Rovers had 'hydroboost' brakes, as opposed to vacuum assist. Looks to me, that #4 would likely do the job for you nicely, you can unscrew them and move them to other ports drilled in the plenum base, if it makes things easier. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 22, 2019 Share Posted August 22, 2019 Suspect #1 is the charcoal canister for the fuel tank vapours, #2 is crank vent. #3 is for fuel pressure regulator, #4 would be brake servo on cars that had it, although they had a valve there to prevent a backfire from popping the servo diaphragm so its worth checking. Quote Link to comment Share on other sites More sharing options...
alesak Posted August 22, 2019 Author Share Posted August 22, 2019 Many thanks. Yes, nr. 1 is part of EVAP system for gasoline vapours, i dounbt i can use it as vacuum source because it's connected BEFORE throttle, so i can just plug it. Nr. 2 and 4 are both for crank vent, as P38 has a closed venting system: nr. 2 works at full throttle conditions and nr. 4 at idle/cruising condition. So for my brake booster vacuum i can drill a new opening in trumpet base or just put a T on nr. 4 opening and use this vacuum point both for brake booster and crank venting. Quote Link to comment Share on other sites More sharing options...
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