1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

4.0L TRD S/C Vacuum Hose?

Discussion in 'Performance and Tuning' started by trailhoor, Jun 1, 2013.

  1. Jun 1, 2013 at 8:22 AM
    #1
    trailhoor

    trailhoor [OP] Well-Known Member

    Joined:
    Dec 21, 2009
    Member:
    #27962
    Messages:
    78
    Gender:
    Male
    Colorado
    Vehicle:
    08 BLK TRD
    King Adj Remote C/Os, Icon UCAs, King Adj Remote Rears, Alcan Leafs, Light Racing Jounce Shocks, Defined Engineering Shackles, Defined Engineering X-brace, Hakkapelittas (winter), Tunes, TRD S/C, APR X-1, URD 2.825 pulley, AFE Stage II, Doug Thorley LT, All Pro Rear Plate Bumper, Tom Woods CV drive shaft, FX-R HID headlights, diff lock, door chime, fogs anytime, bright reverse lights, map lights wired to door lights, defrost A/C, bed bike mounts
    I'm wondering if one of you TRD s/c'd guys can help me out. There's a vacuum line on the rear pass side of the engine coming off an actuator. I believe it adjusts fuel based on boost pressure. So, I connected this vacuum line to the pressurized side of the blower. However, I also have a vacuum port on my intake that it could connect to.

    Any explanation on what this vacuum line does and which port it should connect to is much appreciated.

    Working with APR to tune my X-1. David over there is awesome. One map change and the URD pulley gave some nice gains in Hp (just going by feel). Wondering if the 7th Inj is a must. More coin to drop but it sounds like that can make a huge difference in power with the additional cooling and increased efficiency of the roots. I also have a stock Y-pipe and muffler. I was thinking my next mod would be HID projectors but I'm goofing around with my motor now, ha hah

    Vacuum.jpg
     
  2. Jun 1, 2013 at 8:43 AM
    #2
    Torspd

    Torspd Tor-nication

    Joined:
    Sep 18, 2009
    Member:
    #22958
    Messages:
    5,978
    Gender:
    Male
    First Name:
    Tor
    Houston
    Vehicle:
    MMVI 4.4L 4x4 Access Cab
    Torspd Custom Turbo kit [] Borg Warner 9180EFR Turbo [] ProEFI Pro128 EMS [] TiAL Q BOV [] TiAL V44 Wastegate @ 15psi [] CP Pistons [] CP Carrillo Rods [] ARP Head studs [] ARP Main Studs [] ARP Header - Head Studs [] Ported Heads w/ 1mm oversized valves intake/exhaust [] Brian Crower Forged Stroker Crank [] Darton M.I.D. Sleeved Block [] Kelford Camshafts [] Torspd 170* T-stat mod [] APR Large Fuel Rail [] Aeromotive Stealth 340 LPH Fuel Pump [] FueLab FPR [] APR T56 Conversion Kit [] KP RACING Built T56 [] McLeod Racing Custom Twin Disk Clutch [] One Piece Aluminum Driveshaft [] MGW Shifter [] Custom lowering kit [] Ohlins Front Coilovers [] QA1rear shocks [] Custom Ron Davis Radiator [] Dual SPAL Electric Fans []
    Leave it as is in the picture. Puts vacuum and boost on the fuel pressure regulator. Otherwise known as the FPR mod.

    Increases the fuel at a 1:1 ratio.
     
  3. Jun 2, 2013 at 6:44 PM
    #3
    trailhoor

    trailhoor [OP] Well-Known Member

    Joined:
    Dec 21, 2009
    Member:
    #27962
    Messages:
    78
    Gender:
    Male
    Colorado
    Vehicle:
    08 BLK TRD
    King Adj Remote C/Os, Icon UCAs, King Adj Remote Rears, Alcan Leafs, Light Racing Jounce Shocks, Defined Engineering Shackles, Defined Engineering X-brace, Hakkapelittas (winter), Tunes, TRD S/C, APR X-1, URD 2.825 pulley, AFE Stage II, Doug Thorley LT, All Pro Rear Plate Bumper, Tom Woods CV drive shaft, FX-R HID headlights, diff lock, door chime, fogs anytime, bright reverse lights, map lights wired to door lights, defrost A/C, bed bike mounts
    Perfect- thanks for that :)
     
  4. Aug 14, 2013 at 10:19 PM
    #4
    navarski

    navarski Active Member

    Joined:
    Jun 14, 2012
    Member:
    #80688
    Messages:
    25
    Gender:
    Male
    First Name:
    Navarski
    Yuma County
    Vehicle:
    V8 killer
    TRD Cold Air Intake , DTLTH, performance Y-pipe, Fuel pump upgrade. 2.85 pulley TRDsupercharger/gen1 o2 sim
    I recently found that same long black hose dangling and burning on my headers. The port where it should go , has always been plugged with a little black cap and I cannot find where that hose could have been plugged up to. So I guess my question is,; why wasn't it originally plugged in in its proper place when the s/c was installed @ toyota?
     
  5. Aug 14, 2013 at 10:41 PM
    #5
    amain

    amain Well-Known Member

    Joined:
    Sep 18, 2011
    Member:
    #63744
    Messages:
    136
    Gender:
    Male
    First Name:
    Brian
    Washington
    Vehicle:
    07 SC TRD FJ - The Black Lemon
    Fender Cracks
    Um the above post is incorrect. The vacuum line actually goes to the intake tube. The port you see on top of the SC is capped off because that is where you hook up a boost gauge if installed.
     
  6. Aug 15, 2013 at 4:38 AM
    #6
    Brunes

    Brunes abides. Staff Member

    Joined:
    May 31, 2008
    Member:
    #7011
    Messages:
    17,730
    Gender:
    Male
    First Name:
    Rotorhead
    Big Easy, USA
    Vehicle:
    08 Red/Graphite and Satin Black
    Inside: Tint, Wet Okole 1/2 Piped Red/Black Covers, Black Weathertech Digital Fit Mats, URD Short Throw w/ TWM Weighted Knob, USA Spec iPod adapter. Outside: 4300K Retro w/ Angel Eyes and Red Shrouds, 5000K Blazer Fog Light Retrofit, Debadge, Bed Locking Handle, Satin Black Rims Performance: TRD/Steigmeier Blower w/ 2.7 Pulley. 668 Injectors and 320 LPH AEM Fuel pump. URD UCON and 7th Injector. DTLT Headers, URD Y-Pipe, Wicked Flow Muffler. Suspension: Both: OME Shocks Front: 886X's and TC UCAs Rear: Dakars Armor: Relentless Front Bumper Relentless High Clearance Rear w/ Tire/Rotopax Swing Out Relentless Front, Mid, and TCase skids BAMF Diff Skid Recovery and Spares: Fullsize Spare Tire 2x2 gal Rotopax 1x1 gal Rotopax 1x1 gal Water Rotopax Warn 9.5XP-S Winch Hi-Lift Extreme 60" Ironman Off-Road Recovery Kit Upcoming: ATO Gas Tank Skid and Sliders w/ kickout. ATO Shackle Flip Kit. Down the line: Front/Rear ARB Lockers w/ OBA. 4.56 Gears
    It can be, but you can also boost reference the fuel pressure regulator like the above post described. Once my blower is on my truck - it will be "T"d and plugged into both the boost gauge and the FPR.
     
  7. Aug 15, 2013 at 7:05 AM
    #7
    spithead051

    spithead051 Well-Known Member

    Joined:
    Jun 16, 2011
    Member:
    #58359
    Messages:
    723
    Gender:
    Male
    First Name:
    Patrick
    Fairfax, VA
    Vehicle:
    09 AC 4x4 OR S/C'ed!
    Supercharger, OME Lift Kit, TRD T/X Pro Wheels, 255/85/R16 BFG MT KM2's, APEX three hoop bumper, Allpro IFS skid, All-Pro Sliders, Dynomax exhaust, aFe Stage 2 si, Oil pressure, oil temperature, boost, A/F ratio gauges, Devil horns, WO seat covers
    I just installed a VAC/Boost gauge on my truck and that port on the S/C gives vacuum and boost readings. The FPR mod allows the FPR to not only adjust in vacuum but also when in boost by adding an extra pound of fuel pressure for each pound of boost.

    Most folks just use that port for their boost gauge and that is fine for most S/C applications but if you want to add a pulley to your S/C it is strongly recommended to perform the FPR mod so the fuel system can keep up.
     
  8. Aug 15, 2013 at 4:58 PM
    #8
    navarski

    navarski Active Member

    Joined:
    Jun 14, 2012
    Member:
    #80688
    Messages:
    25
    Gender:
    Male
    First Name:
    Navarski
    Yuma County
    Vehicle:
    V8 killer
    TRD Cold Air Intake , DTLTH, performance Y-pipe, Fuel pump upgrade. 2.85 pulley TRDsupercharger/gen1 o2 sim

    I got a urd 2.8 pulley on order, along with a fuel pump upgrade. What els would i need to support this smaller pulley?. I've read that no flash or tunning would be nassary with this size pulley,true?. Sorry for the rookie questions, im new to the whole S/C thing. oh.. and how how would a FPR mod work? Do you just buy a performance FPR? Thanks again ya'll.
     
    Last edited: Aug 15, 2013
  9. Aug 15, 2013 at 5:02 PM
    #9
    Torspd

    Torspd Tor-nication

    Joined:
    Sep 18, 2009
    Member:
    #22958
    Messages:
    5,978
    Gender:
    Male
    First Name:
    Tor
    Houston
    Vehicle:
    MMVI 4.4L 4x4 Access Cab
    Torspd Custom Turbo kit [] Borg Warner 9180EFR Turbo [] ProEFI Pro128 EMS [] TiAL Q BOV [] TiAL V44 Wastegate @ 15psi [] CP Pistons [] CP Carrillo Rods [] ARP Head studs [] ARP Main Studs [] ARP Header - Head Studs [] Ported Heads w/ 1mm oversized valves intake/exhaust [] Brian Crower Forged Stroker Crank [] Darton M.I.D. Sleeved Block [] Kelford Camshafts [] Torspd 170* T-stat mod [] APR Large Fuel Rail [] Aeromotive Stealth 340 LPH Fuel Pump [] FueLab FPR [] APR T56 Conversion Kit [] KP RACING Built T56 [] McLeod Racing Custom Twin Disk Clutch [] One Piece Aluminum Driveshaft [] MGW Shifter [] Custom lowering kit [] Ohlins Front Coilovers [] QA1rear shocks [] Custom Ron Davis Radiator [] Dual SPAL Electric Fans []
  10. Aug 15, 2013 at 5:06 PM
    #10
    navarski

    navarski Active Member

    Joined:
    Jun 14, 2012
    Member:
    #80688
    Messages:
    25
    Gender:
    Male
    First Name:
    Navarski
    Yuma County
    Vehicle:
    V8 killer
    TRD Cold Air Intake , DTLTH, performance Y-pipe, Fuel pump upgrade. 2.85 pulley TRDsupercharger/gen1 o2 sim
    Thanks for the warm and fuzzy!:)
     
  11. Aug 15, 2013 at 5:12 PM
    #11
    Torspd

    Torspd Tor-nication

    Joined:
    Sep 18, 2009
    Member:
    #22958
    Messages:
    5,978
    Gender:
    Male
    First Name:
    Tor
    Houston
    Vehicle:
    MMVI 4.4L 4x4 Access Cab
    Torspd Custom Turbo kit [] Borg Warner 9180EFR Turbo [] ProEFI Pro128 EMS [] TiAL Q BOV [] TiAL V44 Wastegate @ 15psi [] CP Pistons [] CP Carrillo Rods [] ARP Head studs [] ARP Main Studs [] ARP Header - Head Studs [] Ported Heads w/ 1mm oversized valves intake/exhaust [] Brian Crower Forged Stroker Crank [] Darton M.I.D. Sleeved Block [] Kelford Camshafts [] Torspd 170* T-stat mod [] APR Large Fuel Rail [] Aeromotive Stealth 340 LPH Fuel Pump [] FueLab FPR [] APR T56 Conversion Kit [] KP RACING Built T56 [] McLeod Racing Custom Twin Disk Clutch [] One Piece Aluminum Driveshaft [] MGW Shifter [] Custom lowering kit [] Ohlins Front Coilovers [] QA1rear shocks [] Custom Ron Davis Radiator [] Dual SPAL Electric Fans []
    Yes sir. :)
     
  12. Aug 15, 2013 at 5:18 PM
    #12
    tank3105

    tank3105 Well-Known Member

    Joined:
    Jun 18, 2012
    Member:
    #80890
    Messages:
    224
    Gender:
    Male
    Houston
    Vehicle:
    13 baja T/X edition supercharged
    Supercharged.
    Yes fpr mod saved my ass till I get a fuel pump...:)
     
To Top