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How long will my JSpec MX6 cope with doing 100kph in 3rd gear?

I often knock my auto shifter down into 'S' if I want to up a hill in a hurry without the auto shifting up and down or if I want to overtake. Quite often I forget to put if back up to 'D' for a while. I only notice when I feel more engine braking that I expect or see my revs at 4000. It doesn't seem to worry the car, in fact its more responsive and has heaps more grunt.

I did a trip over the weekend that involved lots of long hills and corners. Any reason not to leave it in 'S' the whole way? I would expect fuel consumption to be higher, but will the V6 engine cope with 4000rpms for extended periods like several hours? Will my transmission melt?
 

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gareth_nz said:
How long will my JSpec MX6 cope with doing 100kph in 3rd gear?

I often knock my auto shifter down into 'S' if I want to up a hill in a hurry without the auto shifting up and down or if I want to overtake. Quite often I forget to put if back up to 'D' for a while. I only notice when I feel more engine braking that I expect or see my revs at 4000. It doesn't seem to worry the car, in fact its more responsive and has heaps more grunt.

I did a trip over the weekend that involved lots of long hills and corners. Any reason not to leave it in 'S' the whole way? I would expect fuel consumption to be higher, but will the V6 engine cope with 4000rpms for extended periods like several hours? Will my transmission melt?
May be an issue for the transmission, install a big ol cooler if you wanna do that a bunch.

The motor, no prob... My six went 30 hours or so straight at 4000rpms or more....no complaints.
 

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You should look into installing a transmission cooler anyways, even if you don't drive at those RPM's often.

FYI: In my manual Mx6 I average around 4000-45000rpm on the freeway for several hours at a time so nothing will happen to your engine, it's the ATX tranny that will overheat.
 
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