Tom Wilson
August 11, 2011

Stock TB, 3.625 PulleyKB TB, 3.625 PulleyStock vs. KB
RPMPowerTorqueBoostPowerTorqueBoostPowerTorqueBoost
2,300170.05388.269.11175.07399.728.925.0211.46-0.19
2,400183.09400.659.30185.09405.079.072.004.42-0.23
2,500193.82407.169.46196.21412.179.412.395.01-0.05
2,600205.38414.859.52209.31422.799.803.937.940.28
2,700215.93420.009.55218.65425.2910.182.725.290.63
2,800229.18429.869.91232.86436.7810.453.686.920.54
2,900241.27436.9110.44244.77443.2610.583.506.350.14
3,000256.24448.6011.02257.57450.8910.901.332.29-0.12
3,100264.27447.7211.46270.94459.0411.356.6711.32-0.11
3,200272.45447.1811.52279.90459.3711.647.4512.190.12
3,300284.34452.5311.60290.34462.0811.856.009.550.25
3,400295.03455.7211.74302.72467.6312.037.6911.910.29
3,500310.34465.6911.76309.96465.1012.19-0.38-0.590.43
3,600315.88460.8511.67322.03469.8412.256.158.990.58
3,700326.45463.3811.81330.31468.8312.313.865.450.50
3,800335.12463.2012.18342.93474.0012.467.8110.800.28
3,900345.25464.9212.28351.80473.7412.596.558.820.31
4,000357.09468.8812.22365.41479.8012.588.3210.920.36
4,100366.21469.1012.41374.46479.6812.608.2510.580.19
4,200377.10471.5712.76383.39479.4212.746.297.85-0.02
4,300385.29470.6012.74392.58479.5112.917.298.910.17
4,400395.26471.8012.62405.76484.3213.0810.5012.520.46
4,500407.16475.2112.70413.04482.0913.155.886.880.45
4,600417.54476.7312.80424.99485.2213.057.458.490.25
4,700424.83474.7612.39434.98486.0813.0010.1511.320.61
4,800431.28471.8912.12441.45483.0313.1310.1711.141.01
4,900440.97472.6712.53451.48483.9113.1710.5111.240.64
5,000451.32474.0712.98462.44485.7613.0911.1211.690.11
5,100462.07475.8512.82473.33487.4512.9611.2611.600.14
5,200468.47473.1712.52481.24486.0612.8112.7712.890.29
5,300477.93473.6012.12495.81491.3112.9117.8817.710.79
5,400487.42474.0811.78505.76491.9213.3218.3417.841.54
5,500491.22469.0811.62510.65487.6313.4219.4318.551.80
5,600504.63473.2711.51520.64488.3013.1116.0115.031.60
5,700509.19469.1911.43533.13491.2412.8323.9422.051.40
5,800519.02469.9911.21540.26489.2412.5421.2419.251.33
5,900525.56467.8610.99548.13487.9312.4722.5720.071.48
6,000532.26465.9211.37555.09485.9012.5922.8319.981.22
6,100540.28465.1811.94565.42486.8212.8025.1421.640.86
6,200544.21461.0211.68574.26486.4713.0530.0525.451.37
6,300553.31461.2711.31582.56485.6512.6529.2524.381.34
6,400558.10458.0111.14593.25486.8512.1735.1528.841.03
6,500567.56458.6011.02599.37484.2912.5531.8125.691.53
6,600569.91453.5210.89609.23484.8113.2039.3231.292.31
6,700577.79452.9410.60618.45484.8013.0040.6631.862.40
6,800579.23447.389.98624.30482.1912.6945.0734.812.71
6,900585.67445.80n/a631.36480.5712.7245.6934.77n/a

Big for Bigger

Along with their other innovations, Coyote engines use new electronics in their throttle bodies. Previously Ford throttle bodies employed a carbon resistive wiper to generate the throttle position signal. This is a contact system where a metal wiper sweeps across a carbon plate, and like all mechanical systems, it is prone to wear and occasional failure.

Coyote throttle bodies replace the contact system with a solid-state magnetic sensor to track throttle blade position. A magnet is fixed to the end of the throttle shaft while a proximity sensor embedded on a small circuit board mounted close by the throttle armùbut not touchingùsenses the magnet's flux field to generate the necessary position signal used by the engine management computer. Except for the rotating throttle shaft, there are no moving parts, and with no contact, the system should easily last the engine's lifetime.

One consideration is the shaft and its magnet must be both the correct distance from and in the correct orientation to the proximity sensor. This is done during throttle-body manufacturing, so you don't have to worry about it. So, while the throttle body works differently, swapping the stock Coyote throttle body electronics into Kenne Bell's 168mm unit follows almost the same procedure as before.

In general, the stock throttle body cover is removed, along with an idler gear and small electric motor. The motor and gear slip in the KB throttle body, and the stock Ford cover is screwed on. The only details are setting the backlash in the gears, which is easily done using a tiny gauge as shown in the photos, and installing the required Kenne Bell tuning using a Hypertech handheld programmer.

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