Dethrottled - Throttle Body Upgrade
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Dethrottled - Throttle Body Upgrade
4.0L throttle body for 2.5LSomewhere in the annals of hot rod history someone decided to toss a bigger carb-uretor on an engine for more fuel and air, and thus more power. Sounds like a plan to us. The modern equivalent is to put a larger throttle body on your multi-port injected Jeep engine. If you have a 4.0L, then that’s not so cheap or easy because it requires expensive aftermarket parts and/or custom machining. But if you own an MPI 2.5L in a YJ, XJ, or TJ, then it’s pretty cheap and easy. The 58mm throttle bodies on 4.0Ls are just larger versions of the 52mm throttle bodies on 2.5Ls. Does this swap make more horsepower? That’s debatable, but the 2.5L in our little TJ seems more responsive and peppy off the line. This is probably the result of the much cleaner throttle body as opposed to the dirty gunked-up one it replaced, but hell, we feel it. At $35 for a used throttle body and an hour’s worth of work, we’ll take the butt-dyno numbers as proof enough. The mechanical part of this is pretty easy. First pull the air tube off the old throttle body, loosening the band clamps with a flat-blade screwdriver. Then pop the throttle cable off, unplug the sensors from the wiring harness, and use a 10mm socket to remove the throttle body from the intake and swap your old sensors to the new throttle body. Reinstallation is reverse of removal. Easy. Follow along as we show you our swap and give some tips along the way.
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4.0L throttle body for 2.5LSomewhere in the annals of hot rod history someone decided to toss a bigger carb-uretor on an engine for more fuel and air, and thus more power. Sounds like a plan to us. The modern equivalent is to put a larger throttle body on your multi-port injected Jeep engine. If you have a 4.0L, then that’s not so cheap or easy because it requires expensive aftermarket parts and/or custom machining. But if you own an MPI 2.5L in a YJ, XJ, or TJ, then it’s pretty cheap and easy. The 58mm throttle bodies on 4.0Ls are just larger versions of the 52mm throttle bodies on 2.5Ls. Does this swap make more horsepower? That’s debatable, but the 2.5L in our little TJ seems more responsive and peppy off the line. This is probably the result of the much cleaner throttle body as opposed to the dirty gunked-up one it replaced, but hell, we feel it. At $35 for a used throttle body and an hour’s worth of work, we’ll take the butt-dyno numbers as proof enough. The mechanical part of this is pretty easy. First pull the air tube off the old throttle body, loosening the band clamps with a flat-blade screwdriver. Then pop the throttle cable off, unplug the sensors from the wiring harness, and use a 10mm socket to remove the throttle body from the intake and swap your old sensors to the new throttle body. Reinstallation is reverse of removal. Easy. Follow along as we show you our swap and give some tips along the way.
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