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Weber jetting, what I've used that has worked

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  • Weber jetting, what I've used that has worked

    So I thought I would write up something to help those who are having trouble with their weber carbs and getting them dialed in. One of my biggest gripes through the last few years has been that although all the directions you will find say to look at and write down what jets are in your carbs, NO ONE seems to do this, or share the results. So here is what I’ve had in multiple Weber carbs, on multiple cars, with often vastly different engine set ups. These are all working setups, which were used on street driven cars, all adjustment screws were at or very near weber base settings. These are good functioning settings, which may not work perfectly for you, but can serve as a baseline. YOU still have to do the tuning and checking to make sure your car is in good running order, drive it, read the spark plugs, etc and decide if your carb tune is correct.

    #1 32/36 DGEV on internally stock 3TC with approx 230-255k. Stock mechanical fuel pump/lines. Using a Offenhauser dual-port intake, pacesetter 4-1 header and 2.5 inch exhaust with high flow cat.
    Primary Fuel Jet: 130
    Primary Air Corrector: 165
    Primary Idle Jet: 45
    Secondary Fuel Jet: 125
    Secondary Air Corrector: 150
    Secondary Idle Jet: 50
    Pump Jet: 50
    Emulsion Tubes: F-50
    Venturi: 3.5

    #2 32/36 DGEV on completely stock 3TC with approx 160-185k miles. Stock mechanical fuel pump and lines.
    Primary Fuel Jet: 130
    Primary Air Corrector: 165
    Primary Idle Jet: 45
    Secondary Fuel Jet: 125
    Secondary Air Corrector: 150
    Secondary Idle Jet: 50
    Pump Jet: 50
    Emulsion Tubes: F-50
    Venturi: 3.5

    #3 32/36 DGEV on rebuilt/fresh 2.0L 3TC with fairly large cam, oversized valves, mild port and polished head and high comp 89mm pistons, 4-1 Header with 2.5” exhaust. 3/8 fuel supply and return lines with carter fuel pump and pressure regulator. This engine was dyno tested at 115hp and 112 ft/lbs of torque with a slightly different tune, that showed as being a little lean, so it was re-tuned richer, but not re-dyno’d.
    Primary Fuel Jet: 150
    Primary Air Corrector: 160
    Primary Idle Jet: 70
    Secondary Fuel Jet: 145
    Secondary Air Corrector: 155
    Secondary Idle Jet: 55
    Pump Jet: 50
    Emulsion Tubes: F-50
    Venturi: 3.5

    #4 32/36 DGV on 3TC with stock bottom end, oversized valves, an aggressive cam and 4-1 header with 2.5” crush bent exhaust. Stock mechanical fuel pump and lines.
    Primary Fuel Jet: 140
    Primary Air Corrector: 150
    Primary Idle Jet: 55
    Secondary Fuel Jet: 150
    Secondary Air Corrector: 155
    Secondary Idle Jet: 50
    Pump Jet: 50
    Emulsion Tubes: F-50
    Venturi: 3.5

    #5 32/36 Weber on very healthy stock 2TC with only 120k miles. Stock Mechanical fuel pump and lines. Factory 4-2-1 header and downpipe with 2” crush bent exhaust.
    Primary Fuel Jet: 125
    Primary Air Corrector: 145
    Primary Idle Jet: 50
    Secondary Fuel Jet: 130
    Secondary Air Corrector: 150
    Secondary Idle Jet: 45
    Pump Jet: 50
    Emulsion Tubes: F-50
    Venturi: 3.5

    #6 Single 40mm Weber DCOE 151, on very healthy stock 2TC with 125k miles. Stock mechanical fuel pump and lines. Factory 4-2-1 header and downpipe with 2” crush bent exhaust.
    Main Jet: Unknown, they are unstamped, but visually they appear larger then 150 jets, which is the largest I had on hand to compare them to.
    Air Corrector: 170
    Idle Jet: 50F9
    Emulsion Tubes: F11
    Choke Tubes: 30mm
    Venturis: 4.5

    #7 Dual 40mm Weber DCOE 151, on rebuilt/fresh 2.0L 3TC with fairly large cam, oversized valves, mildly port and polished head and high comp 89mm pistons, 4-1 Header with 2.5” exhaust. 3/8 fuel supply and return lines with carter fuel pump and pressure regulator.
    Main Jets: 145
    Air Correctors: 190
    Idle Jets: 55 F9
    Emulsion Tubes: F2
    Choke Tubes: 36mm
    Venturis: 4.5
    Last edited by Bubbajohnson; 06-03-2012, 05:41 PM.
    82 TE72 Wagon "DRFTWGN" 2.0L 3TC, dual 40mm DCOE's.
    75 Celica 335+k all original awesomeness
    80 TE72, Lowered on full 86GTS running gear, single sidedraft DCOE
    2011 Tacoma 4x4, daily driver work truck

  • #2
    Very Interesting write up.
    I used to have a weber 32/36 on my 3t, but have recently switched to a holley 2300 series carb. i had to jet it down like 10 sizes to get it to where its at now, and it still runs rich and sometimes cuts out if you floor it.
    Shoulda stuck with the weber.... lol
    Made in the 80's, Loved by the ladies.
    1982 TE72
    1985 AE86
    1984 BMW 325

    Comment


    • #3
      If you still have the weber, re-jet it to match one of my carbs thats close to your set up, I bet it'll put you in the ballpark! I'm also selling a 32/36 right now, choke does not work great, but can probably be fixed, ads in the for sale section. I just swapped to my sidedrafts so don't need it anymore.
      82 TE72 Wagon "DRFTWGN" 2.0L 3TC, dual 40mm DCOE's.
      75 Celica 335+k all original awesomeness
      80 TE72, Lowered on full 86GTS running gear, single sidedraft DCOE
      2011 Tacoma 4x4, daily driver work truck

      Comment


      • #4
        The weber I have if pretty much done for.
        there's a bunch of screws screwed into old vacuum lines and what not.
        have u ever messed around with holleys on 3t.
        Made in the 80's, Loved by the ladies.
        1982 TE72
        1985 AE86
        1984 BMW 325

        Comment


        • #5
          Nope, never touched any Holleys myself, but I hear they work great once dialed in. Search around at 3tcgarage.com I've seen several threads about tuning holley carbs.
          82 TE72 Wagon "DRFTWGN" 2.0L 3TC, dual 40mm DCOE's.
          75 Celica 335+k all original awesomeness
          80 TE72, Lowered on full 86GTS running gear, single sidedraft DCOE
          2011 Tacoma 4x4, daily driver work truck

          Comment


          • #6
            Dan/Rich I'll need your help tuning mine! I need to buy a synchrometer
            "the only person that wins is the internet. and she is a cold hard bitch." - srt4monster-san

            Comment


            • #7
              Originally posted by NuDriftR View Post
              Dan/Rich I'll need your help tuning mine! I need to buy a synchrometer
              Don't buy one, I own one!
              82 TE72 Wagon "DRFTWGN" 2.0L 3TC, dual 40mm DCOE's.
              75 Celica 335+k all original awesomeness
              80 TE72, Lowered on full 86GTS running gear, single sidedraft DCOE
              2011 Tacoma 4x4, daily driver work truck

              Comment


              • #8
                offer still stands to help you tune that holley..
                "Those who sacrifice liberty for security deserve neither"

                Comment


                • #9
                  This is an update to entry #7 on my list.
                  Thanks to a wideband O2 sensor, discovering my fuel pump was not putting out consistent volume, a float adjustment and a whole lot of drive time, fiddling and tuning I think I have the dual 40's tuned as well as I can with what I know about tuning DCOE's.
                  Its now running:
                  Main Jets: 140
                  Air Correctors: 200
                  Idle Jets: 60F9
                  Emulsion Tubes: F2
                  Choke Tubes: 36mm
                  Venturis: 4.5
                  This set up runs GREAT!! Most of the problem with the old "tune" was my fuel issues both with the pump not holding steady because of a slightly loose wire, and I discovered one of my carbs float level was different from the other and they both were set way to high, causing an intermittent bogging issue. Now that both those issues are sorted out and I've logged a good 700+ miles just watching the air/fuel meter and observing then adjusting jets, I'm very happy! The car feels more powerful and responsive then it has at any point with these carbs, I have no random bogging and can drive like as much of a jackass as I want to :cheers:. Just last weekend me and 3 friends loaded up the car with ourselves and maybe 200lbs of gear and took a 240mile trip to the mountains and back. I had no problem holding 70+ up any grade, only shifting to 4th gear every now and again and we got over 20mpg on the trip!! My air/fuel mixture reads about 14-14.5 at idle, so maybe a touch lean, but not bad. 13-13.5:1 at 60-70mph in 5th gear while cruising (Not uphill!). 12-12.5:1 with mild load and on most up hill grades in 4th or 5th gears and 11.5-12:1 under heavy throttle/5000+ rpms right up until it hits my rev limiter at 7000rpm.
                  82 TE72 Wagon "DRFTWGN" 2.0L 3TC, dual 40mm DCOE's.
                  75 Celica 335+k all original awesomeness
                  80 TE72, Lowered on full 86GTS running gear, single sidedraft DCOE
                  2011 Tacoma 4x4, daily driver work truck

                  Comment

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