I've been doing a LOT of thinking about gearing over the past year, and this looks like a good place to post some thoughts.
WARNING: This will be long and boring, so get some coffee or skip it entirely if you're perfectly happy with the way your car drives.
I think I'm in the same boat as a lot of SOCers - a mild stroker (a bit smaller than 2110cc), stock gearing, and a 3:88. I'm happy with the power, torque, and smoothness of the engine. It just seems like the gearing is what's keeping it from driving like a normal car.
Like fr'instance:
- I'm on the freeway, cruising at 65-70, and up looms a hill. I start to sweat. Will it be too steep to hold fourth? I actually dread having to downshift - all the way down to third. My revs will shoot up and the engine will sound like it's killing itself. If it's a very long hill, maybe it IS killing itself - a little bit each time I do this.
- Or, I'm on the same freeway hill in the passing lane, just above lugging the engine, and some moron pulls out in front of me, making me slow just enough to fall off the power band - OH NO!!!
What I find myself doing is speeding up before the hill to maybe 75-80 so that I'm in the meaty part of the power band, but now I'm nervously checking the mirrors for those sneaky radar cops who are on the lookout for Speedster drivers with wide-spaced gears.
- I'm cruising around town at 35-45, just a little too slow for fourth, and my engine is making this loud, buzzing racket. It's downright uncivilized. I used to think people were stopping and pointing because of what a striking car this is. But now, I'm not so sure.
- I'm starting out from a stop sign, up a moderate hill, in a 40 mph speed zone. I've got to take second gear all the way up to 4000, even if I don't want to go fast, to avoid lugging it when I shift into third.
None of my neighbors, in their normal Corollas, Civics, and Kias need to do any of this. Why should I in my fancy-schmancy sports car?
So, I'm having a Gene Berg five speed built as I type this. And the gearing I've chosen is in this chart, along with my current gearing so that you can compare the two. I think these gears will solve all of the above problems and make the car a lot more drivable through all speed ranges.
Basically, I'm keeping 1st, 2nd, and 4th as is, but putting in two evenly spaced gears where 3rd is now. This lowers the gap between 2nd and 3rd, and the more critical one between 3rd and 4th (well OK, between what now become 4th and 5th).
I'm keeping top gear where it is because the whole point is to avoid having to downshift from top gear as much as possible at highway speeds. My current top gear (with the 3.88) gives me 74 mph at 3500 rpm, which is good enough for me. I don't really spend much time on the freeway anyway, and with taller gearing, I'd be downshifting on milder hills than I do now.
My current tires are small - 175/65 15, so I could get slightly taller gearing by going to 165/80 15's. But I probably won't do that.
By now, you're probably needing a second cup of coffee.