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heavychevy

Straight Cut Gear (One Only)

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heavychevy

My car has a 3rd gear munching problem. I can get 10 or so months from a stock one and maybe 18 months from a strengthened one. At about $2500 a pop (with labor), I'm trying to find some better solutions. The G96 box in the 911 is not great with big torque and big grip. Most turbo cars end up eating 3rd gear regularly with this setup.

 

One solution that has been brought up is a straight cut 3rd gear. The G96 gears are house separately so I would only change one gear to straight cut and keep the rest helical. Car would also retain helical synchros.

 

Question is if one straight cut gear would cause me to take a .2 penalty.

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kbrew8991

yep, so might as well straight cut them all and make it worth it

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heavychevy
yep, so might as well straight cut them all and make it worth it

 

That's a 12-15k job in my car (buying each gear set separately). And still no guarantee to last all that much longer. I'd rather add the $2500 to the list of consumables, or spring for a real sequential.

 

------

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kbrew8991

Mo Money, Mo Speed, Mo Problems...

 

$12k would build two TTF/PTF cars. Must be nice

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TurboShortBus

OK, you might be in luck. Something didn't seem quite right to me ("dog ring" does not necessarily imply "straight cut," and vice versa; they are 2 different features of a gear), so I called Greg during my drive home.

 

Here is the TT1/TT2/TT3 rule in question:

If: Dog-ring/straight-cut gears (non-synchromesh transmission),

and/or sequential/paddle shift/semi-automatic, subtract 0.2 = ____________

(no assessment for automatic transmission utilizing a torque converter)

If you replace a synchromesh helical-cut gear with a synchromesh straight-cut gear, then there is no assessment.

If you replace a synchromesh helical-cut gear with a dog-ring helical-cut gear, then you are assessed -0.2.

 

When the rule was written, it was apparently assumed that all straight-cut gears are also dog-ring, which is not necessarily the case.

 

Change away...

 

Mark

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heavychevy

Thanks Mark!

 

I was thinking that was my only chance when I asked.

 

Now lets see how long this straight cut gear lasts.

 

 

 

Jon, my bad I have just been too lazy to delete that.

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Varkwso
Thanks Mark!

 

I was thinking that was my only chance when I asked.

 

Now lets see how long this straight cut gear lasts.

 

 

 

Jon, my bad I have just been too lazy to delete that.

 

Mark is the man....

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