Autocross gearing question
#1
Autocross gearing question
Hello. I recently swapped to a 6 speed and ever since have been wondering how it would affect autocross. I have a 4.3 diff and was wondering if anyone else has the same gearing. And if so, what have been your experiences at autocross with that gearing? Have you had to shift the 3rd and then back to 2nd within a few seconds? Can you ride the course in 3rd effectively? My old 5 speed let me go 2nd all the way through. Just wondering if a 6 speed is a good idea for autocross with it's shorter gears. Thanks
#2
Here's a gearing calculator from KMiata. You can use this to calculate your top speed at each gear.
https://kmiata.com/pages/gearing-cal...2C1%2C0.843%5D
https://kmiata.com/pages/gearing-cal...2C1%2C0.843%5D
#11
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Lots of missing data here. What size tires and what rev limit? Boosted or NA? What are the average speeds of the courses you're running?
With a 6spd/4.3 combo and a raised rev limit (7500-8000) you might be able to get away with launching in 2nd and leaving it in 3rd most of the course (depending on how open your courses are and what kind of torque you're making).
With a 6spd/4.3 combo and a raised rev limit (7500-8000) you might be able to get away with launching in 2nd and leaving it in 3rd most of the course (depending on how open your courses are and what kind of torque you're making).
#14
Not directly apples to apples, but I'm running an NC with a 2.5 swap, and the stock 4.10 rear end. With the 6 speed, i was constantly shifting to third, and often having to go back to second. I decided to swap to a 5 speed transmission in december, and I cant wait to get out to the first autox event in a few weeks.... the ratios in the 5 speed are much better for autocross, though that may be different on a 1.6 motor with less torque.
In all likeliness it should be fine, you will need to practice carrying your speed, and be willing to ride the rev limiter, or practice those shifts to 3rd.
In all likeliness it should be fine, you will need to practice carrying your speed, and be willing to ride the rev limiter, or practice those shifts to 3rd.
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alpinaturbo
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10-22-2015 10:27 PM