There are a couple methods aftermarket companies employ to achieve a higher air flow through the throttle body (TB). One way is to design an upgraded part that smoothes out or removes the restrictions that hinder a stock TB's performance. The other method involves increasing the bore of the venturi to create a larger area for air to flow through. While the first method alone will achieve results, the companies that focus on increasing bore diameter generally use an improved design, material, and machining process that helps decrease the limitations on air flow. This is exactly what Painless Performance did to create their Perfect Hi-Velocity throttle bodies for Jeep 4.0L or Chrysler 4.7L engines.
Painless Performance now offers Perfect Hi-Velocity TB's with a 62mm bore, capable of 600 cfm for the 4.0L (PPP #65300), or a 68mm bore, that can achieve 730 cfm for 4.7L engines (PPP #65301). These throttle bodies are deliberately designed with materials and tolerances to account for current power additions like pressurization or nitrous. They are CNC machined from 6061-T6 aluminum billets for precise detail, allowing the largest possible bore diameter to fit within the factory mounting orifice without sacrificing strength or durability. Every Perfect TB uses high strength sealed ball bearings in conjunction with high temperature grease to ensure long lasting, reliable performance in the harshest of conditions.
Increasing intake air flow is a must for more performance. Especially when matched with the Painless Perfect Hi-Torque Engine Management ECM and harness. With these two products installed in a stock 4.0L, Painless' dyno runs with claimed power gains of 23hp and 15 lb-ft of torque. Yes, that's a bit high in our estimation, but hey, we love the potential!
These Hi-Velocity TBs are a quick and easy bolt-on installation, requiring only basic hand tools.
Without any modifications needed to the factory cables, controls or brackets, these throttle bodies truly are a painless performance product for EFI Jeeps.
 Here is the underside of the...  Here is the underside of the Hi-Velocity T.B. Notice the precision CNC work and detailed design considerations, such as the low profile bolts and the small sensor holes which keep the intake flow as unrestricted as possible. |  It's easy to see the difference...  It's easy to see the difference in bore diameters by comparing the stock, 54mm TB with the new, 62mm Painless unit. This is also a good comparison of the large, stock sensor holes with that of the Perfect TB. |  Here, Larry Garcia is bolting...  Here, Larry Garcia is bolting the stock throttle positions sensor (TPS) to the new TB. Make sure you do not damage the TPS, the manifold absolute pressure (MAP) sensor, or the air idle control (AIC) motor when you remove or reinstall them, as these are expensive little suckers! |
 With the factory TPS, MAP...  With the factory TPS, MAP sensor, and IAC motor swapped over, we threw a gasket on the intake manifold and were ready to install the new throttle body. |  With the rain just starting...  With the rain just starting to roll in, we connected all the wires and bolted down our new TB. Even on a dark, dreary day you can see the shiny finish of the TB's clear anodizing. |  Here is the new Painless tube...  Here is the new Painless tube coupler compared with the stock one, used to connect the air intake tube to the intake of the throttle body. Given a high-flowing air filter, it's easy to see how this constriction in diameter leading to the stock TB caused noticeable restrictions to air flow. |
 It's amazing what some shiny...  It's amazing what some shiny new parts and a half-hour of work can accomplish. Now we just need to add those nitrous and....... |  ......turbocharger additions...  ......turbocharger additions that Painless Performance took into consideration when designing their throttle body! |  How'd We Like It? "After...  How'd We Like It?
"After installing the Painless Performance throttle body on my TJ, I noticed a big difference. It's got a little more go to climb the hills and throttle response is right there. Definitely an easy bolt-on upgrade that is worth it! There was also a slight increase in fuel economy as well, but I quickly squashed that by flooring the throttle."
Larry "LG" Garcia
Jeeps R Us |