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TECH TIPS |
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| Post Turbo | |
| When mounting a probe in the downpipe,(or any pipe for that matter) I prefer the clamp in style. This simply requires drilling a 1/4"-9/32" hole and clamping the probe in. This eliminates any rusting from welds etc. The "post turbo" installation will yield slower response and generally lower temps as some of the heat energy of the exhaust is used to drive the turbo. Typically, the post turbo install will yield approximately 200° lower temps than "pre turbo" but will also remain higher during cool down giving good reference for turbo temp and judging appropriate shutdown time. It is generally thought that 1050° the maximum acceptable sustained temperature for operation. | |
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| Pre Turbo | |
| When mounting a probe in a manifold casting I prefer the thread in style. This simply requires drilling a 7/16" (check tap mfr's recommended drill size) hole and tapping the hole for 1/4" NPT. This can be done on the vehicle so long as care is taken and generally, the engine is idled during drilling/tapping operations. The "pre turbo" installation will yield faster response both up and down. Installing the probe immediately below the foot of the turbo should give an indication of the highest temps in the exhaust system as all cylinders are converging on this point. It is generally thought that 1250° the maximum acceptable sustained temperature for operation. | |
For more information E-mail: john@kennedydiesel.com | |
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