GT3 gear ratios
Discussion
all the talk earlier of gearboxes coupled with an inability to sleep (not because of gearbox talk) had me dig out my gear ratio charts and quickly calculate some more info for various gear ratios in the GT3 models to see how they shaped up in comparison with each other and the ratios in my 996 Cup.
i just calculated speeds in mph at 7000rpm and rounded to nearest mph, firstly to allow a direct comparison without varying redlines fogging things and secondly because i already had gear charts for most of the cars showing speeds at 7000rpm. its just to allow a comparo, not see who can go the fastest
for those of you of a nerdy disposition, enjoy!!! for everyone else, theres plenty other threads
03-05 996 Cup:..........1st-45mph,..2nd-70mph,..3rd-96mph,....4th-106mph,..5th-127mph,..6th-153mph
996.1GT3:.................1st-41mph,..2nd-73mph,..3rd-101mph,..4th-130mph,..5th-162mph,..6th-192mph
996.2GT3&RS:...........1st-41mph,..2nd-73mph,..3rd-101mph,..4th-130mph,..5th-157mph,..6th-184mph
997.1GT3&RS&.2GT3:..1st-42mph,..2nd-70mph,..3rd-97mph,....4th-123mph,..5th-150mph,..6th-172mph
997.2 GT3RS:............1st-37mph,..2nd-63mph,..3rd-87mph,....4th-111mph,..5th-135mph,..6th-162mph
2008 997 Cup...........1st-43mph,..2nd-65mph,..3rd-81mph,....4th-99mph,....5th-122mph,..6th-149mph
heres what this means in terms of shifting in the 997 cup. in combination with that engine the cars is always cooking. this highlights the benefits of the short ratios. the next gear doesnt see you drop significant rpm.
i just calculated speeds in mph at 7000rpm and rounded to nearest mph, firstly to allow a direct comparison without varying redlines fogging things and secondly because i already had gear charts for most of the cars showing speeds at 7000rpm. its just to allow a comparo, not see who can go the fastest
for those of you of a nerdy disposition, enjoy!!! for everyone else, theres plenty other threads
03-05 996 Cup:..........1st-45mph,..2nd-70mph,..3rd-96mph,....4th-106mph,..5th-127mph,..6th-153mph
996.1GT3:.................1st-41mph,..2nd-73mph,..3rd-101mph,..4th-130mph,..5th-162mph,..6th-192mph
996.2GT3&RS:...........1st-41mph,..2nd-73mph,..3rd-101mph,..4th-130mph,..5th-157mph,..6th-184mph
997.1GT3&RS&.2GT3:..1st-42mph,..2nd-70mph,..3rd-97mph,....4th-123mph,..5th-150mph,..6th-172mph
997.2 GT3RS:............1st-37mph,..2nd-63mph,..3rd-87mph,....4th-111mph,..5th-135mph,..6th-162mph
2008 997 Cup...........1st-43mph,..2nd-65mph,..3rd-81mph,....4th-99mph,....5th-122mph,..6th-149mph
heres what this means in terms of shifting in the 997 cup. in combination with that engine the cars is always cooking. this highlights the benefits of the short ratios. the next gear doesnt see you drop significant rpm.
Edited by fioran0 on Sunday 19th February 00:04
the 8/32 (4.0) final drive change is applied as a percentage drop to each gear so has the effect of very slightly closing the gear spacing as larger speeds are reduced more than lower ones. it mainly just lowers the speed across the board though. the cup has completely different ratios fitted to keep the spacing shorter between gears.
with an 8/32 fitted you get:
6.1GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-133mph,...6th-157mph
6.2GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-130mph,...6th-152mph
changing to an 8/32 on the street boxes helps shorten things down so that 4,5 and 6 can be brought into use easier but at the expense of a much shortened 1,2 and 3.
with an 8/32 fitted you get:
6.1GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-133mph,...6th-157mph
6.2GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-130mph,...6th-152mph
changing to an 8/32 on the street boxes helps shorten things down so that 4,5 and 6 can be brought into use easier but at the expense of a much shortened 1,2 and 3.
Edited by fioran0 on Saturday 18th February 11:26
the 7/35 R&P was for the GT3R/RS though can be fitted in the Cups however not if you want to race in a standard class. regs need the 8/32.
inspection required after 10hrs racing and its not to be used for any races longer than 12hrs. replacement depends on inspection results. 8/32 is recommended to be replaced after 8000km with regular inspections.
the GT3R/RS ran the same 1,2 and 3 as the cup but then had a shorter 4th, longer 5th and longer 6th.
not quite sure the porsche motorsport dept in weissach have hillclimbs on their schedule board, though i accept that this would be a good use for it (though perhaps not the car).
inspection required after 10hrs racing and its not to be used for any races longer than 12hrs. replacement depends on inspection results. 8/32 is recommended to be replaced after 8000km with regular inspections.
the GT3R/RS ran the same 1,2 and 3 as the cup but then had a shorter 4th, longer 5th and longer 6th.
not quite sure the porsche motorsport dept in weissach have hillclimbs on their schedule board, though i accept that this would be a good use for it (though perhaps not the car).
Edited by fioran0 on Saturday 18th February 11:35
Too long for a road car, no.
They could do with being closer together and shorter for track driving, something Porsche has been creeping towards as increased rev ranges offset some of the road compromise this brings. A lot of folks run 8/32 final drive to change this.
0-60 times mean nothing unless you drag strip.
They could do with being closer together and shorter for track driving, something Porsche has been creeping towards as increased rev ranges offset some of the road compromise this brings. A lot of folks run 8/32 final drive to change this.
0-60 times mean nothing unless you drag strip.
fioran0 said:
the 8/32 (4.0) final drive change is applied as a percentage drop to each gear so has the effect of very slightly closing the gear spacing as larger speeds are reduced more than lower ones. it mainly just lowers the speed across the board though. the cup has completely different ratios fitted to keep the spacing shorter between gears.
with an 8/32 fitted you get:
6.1GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-133mph,...6th-157mph
6.2GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-130mph,...6th-152mph
changing to an 8/32 on the street boxes helps shorten things down so that 4,5 and 6 can be brought into use easier but at the expense of a much shortened 1,2 and 3.
Yep I think that a cup final drive is a really usable and cost effective upgrade to a 996gt3. Maybe pound for pound one of the best. with an 8/32 fitted you get:
6.1GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-133mph,...6th-157mph
6.2GT3......1st-34mph,...2nd-63mph,...3rd-83mph,...4th-106mph,...5th-130mph,...6th-152mph
changing to an 8/32 on the street boxes helps shorten things down so that 4,5 and 6 can be brought into use easier but at the expense of a much shortened 1,2 and 3.
Edited by fioran0 on Saturday 18th February 11:26
fioran0 said:
Too long for a road car, no.
They could do with being closer together and shorter for track driving, something Porsche has been creeping towards as increased rev ranges offset some of the road compromise this brings. A lot of folks run 8/32 final drive to change this.
if they are to long for track work they are way to long for B road driving.They could do with being closer together and shorter for track driving, something Porsche has been creeping towards as increased rev ranges offset some of the road compromise this brings. A lot of folks run 8/32 final drive to change this.
Good for the ring though lol
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