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Toyota Engine Development, Modification & Performance Tuning
:: 7M-GE 4.6L Mustang Cobra Throttle Body...

Mustang Cobra 4.6L twin plate 57mm throttle Body

Thus begins the throttle body conversion ive been waiting to start for months...

This new unit was sourced on Ebay from a 2001 Mustang Cobra 4.6L 302hp. It features twin 57mm butterflies, sealed ball bearing shaft support, non adjustable idle air through flow (not for much longer) and a metal/nylon rising rate throttle cable cam that just happens to pull in the exact wrong direction for the 7m (towards the plenum). Another feature worth mentioning is the utter lack of coolant lines, vacuum ports and all the other emissions shit usually hanging off most Japanese throttles.

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The 4.6L mustang cobra twin 57mm  t/b resting in position on the intake cover of the 7m. It almost looks like its meant to be there.

Mounting the cobra t/b 'should' be reasonably straight forward. On the 1986/87 Supra 7MGE's with the ACIS plenum design, the stock throttle is located on top of the rocker cover assembly, connected to a Y pipe which divides into two before joining the plenum in two places. Mounting the cobra t/b should just be a simple case of cutting the Y pipe in half width wise (so essentially there'll be 2 bits of converging pipe sticking out from the plenum) and welding a custom cut throttle body base plate to these arms. Then its simple enough to bolt the new cobra t/b to that base plate. 

Side by side with the stock 7M throttle body, the cobra model is scarily big. The stock 7M unit is 60mm dia on a hot day, compared with the twin 57mm throats of the cobra, you start wondering what kind of low end throttle control you can expect to have - or rather not have. With this in mind, plans are afoot for a log or sine based rising rate throttle cable cam and tie rod assembly. more on that as it happens.

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Looking straight across the cam covers, you can see what a tight fit the intake piping is going to be.
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At rear, on the plenum, you can see the two separate 52mm ports of the original assembly.
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The space between the plenum ports and the t/b will be occupied by the original 7m Y pipe assembly (albiet, following some custom manufacture and significant modification)
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Top: stock 60mm 7M throttle body. Below: twin 57mm mustang cobra throttle body.
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Underneath the t/b is the face of the stock 7M Y pipe. This face will be cut off, and the Y pipe sectioned at a point where the converging arms of the stock assembly match the separation of the plates on the cobra t/b




 

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