Performance nut
Well-Known Member
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- #1
I've been calculating gear ratios for the 10R80 and I'm sort of going back and forth on something. Going with a >3.15 will be great for courses where I stay less than 6th gear. Unfortunately my favorite course (COTA) I will shift into 7th on the straights if I go higher than 3.15. 7th is a deeper shift into the RPM range, 7200 to 5600 where as 3-6 drop down to 6000. With a street tire, I'm at 27.4" (295/35-19 and 305/35-19) which makes that back straight stay in 6th pretty much the whole time with the 3.15.
The question is whether or not that 6-7 shift is a big deal or not. Current setup I am in 6th or lower (haven't broken 150 mph on the long straight). Only part where I see having a detrimental effect will be the long straights were I'm 130+ mph. Anything above a 3.55 with my current tire setup or 3.31 with a 26" tire will force me to shift to 7th on the long straight. Another consideration is going with >3.15 also opens options up for things like Torsen differentials though.
The question is whether or not that 6-7 shift is a big deal or not. Current setup I am in 6th or lower (haven't broken 150 mph on the long straight). Only part where I see having a detrimental effect will be the long straights were I'm 130+ mph. Anything above a 3.55 with my current tire setup or 3.31 with a 26" tire will force me to shift to 7th on the long straight. Another consideration is going with >3.15 also opens options up for things like Torsen differentials though.
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