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dyno 5 speed 620


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The transmission does not increase the horsepower.  The engine makes the power.  There is a power loss in the transmission, more in lower gears, than in fourth, because in fourth gear, the ratio is 1 to 1.  Fifth gear, if available again loses more horsepower, because the power has to go through the gears in the transmission again.  In fourth gear, the gears are just spinning, but not carrying any load.

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Has anyone dyno'd a 5 speed l16 stock..der should be more horse power den with a 4 speed right?


You may be thinking it feels more powerful or accelerates faster perhaps with a five speed? Again the internal gear ratios only multiply the available engine torque. There are an almost infinite number of ratios available in a transmission and it's often true that a 4 speed is faster 'off the line' than a 5 speed. The '68-'73 510 stock 4 speed and the '77-'79 200sx 5 speed (two completely different transmissions) have the exact same 1, 2, 3 and 4th gear ratios.


Dyno runs are usually done in 4th gear, which as Daniel pointed out isn't really a gear but a straight through one to one of engine power. A 4 speed and a 5 speed would both be placed in fourth for the run to compare engine output fairly.

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