Does gear ratio change impact torque converter ?

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Okay imagine a highly optimized race car thats setup with 4.56 gears. Then change to a 3.55 gear. Will that make the TC less effective on the launch? By much or so little it wont matter?

Im debating a combo that will have a 3.92, 4.10 or 4.56 gear choice. How much will the TC role play in such a senario?

Any input is appreciated

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It wont change the torque converter... BUT you will
see a difference in total torque(torque of the engine
hasnt changed which will effect the converter)
but the total torque will (engine torque x converter,
usually 2 x at launch x gear in the trans x the
rear ratio and then tire diameter)

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Small, high RPM, peaky motor will have a larger ET loss than a big, low RPM torque motor.......

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High RPM peaky motors need more gear as witnessed at the track for many years and my actual expereinces in changing rear gear ratio in my 518 C.I. low deck stroker motor. My Duster with the 518 motor ran almost identical ET and MPH with 3:73,3:91 and 4:10 using the same converter It seemed like it spent a lot longer time in third gear and the motor seemed lazy with the 3:73 versue the higher ratio but the time slips where the same IHTH

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Once you included "turbo" in the combo, everything changes, and big. A turbo motor will have so much more torque the 3.92 gears may even be too much . How much boost you going to put to it? How tall is the low gear ratio?

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With a turbo you will increase the torque
of the engine(will depend on the boost)which in change
WILL change the stall of the converter

Quote:

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Quote:

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Okay imagine a highly optimized race car thats setup with 4.56 gears. Then change to a 3.55 gear. Will that make the TC less effective on the launch? By much or so little it wont matter?

Im debating a combo that will have a 3.92, 4.10 or 4.56 gear choice. How much will the TC role play in such a senario?

Any input is appreciated

---

It wont change the torque converter... BUT you will
see a difference in total torque(torque of the engine
hasnt changed which will effect the converter)
but the total torque will (engine torque x converter,
usually 2 x at launch x gear in the trans x the
rear ratio and then tire diameter)

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Quote:

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Quote:

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Okay imagine a highly optimized race car thats setup with 4.56 gears. Then change to a 3.55 gear. Will that make the TC less effective on the launch? By much or so little it wont matter?

Im debating a combo that will have a 3.92, 4.10 or 4.56 gear choice. How much will the TC role play in such a senario?

Any input is appreciated

---

It wont change the torque converter... BUT you will
see a difference in total torque(torque of the engine
hasnt changed which will effect the converter)
but the total torque will (engine torque x converter,
usually 2 x at launch x gear in the trans x the
rear ratio and then tire diameter)

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theoretically, going from say a 4.56 to a 3.23, shouldn't it stall *slightly* higher because you've changed the mechanical advantage on the output side, similarly to a TC should stall slightly higher in a heavier car than a lighter car if they have the same drivetrain?

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