just a little info on the side. thought you guys can help me out. how are these tranny ratios estimated? thanx techies.

 

uuuummm anyone???

 

ok,as far as each gear goes, the number specified for each gear is equal to the amount of rotations of the engine compared to the output shaft of the tranny. In other words...4.09 first gear= 4.09 revolutuions of the engine per revolution of the tranny output shaft. This is going to give you more power and rev up faster. As you upshift, the gears need to be longer to compensate for the car/wheels moving at a faster rate. The "gear" ratios will determine the rpm loss from upshifts,and the final drive will determine how much faster the gears will rev up. Correct me if I'm wrong

 

correct!, just to make it a lil easier, is like a mountain bike, the fastest you go the smaller the ratio on the back and in the front, the fastest you go the bigger is got to be the pedal, so you can put the engine as your pedals on the bike and the gears on the back of the bike are just like the wheels

 

How are gear ratio's estimated?"

I'll make it simple

There are actually 2 gears that determine the ratio: one on the countershaft, and the other on the mainshaft.

Simply divide the number of teeth on the counter into the number of teeth on the main. For example, for 1st gear a 98' ITR has a countershaft gear with 42 teeth, and has a mainshaft gear with 13 teeth. 42 divide by 13 = 3.2307692
thereforeth, the 1st gear ratio for a 98' ITR is 3.23

Oh, and about choosing the right gear(s)...
After shifting at peak hp (not necessarily redline), you want a gear that will make you pick up the largest area of torque in the powerband. Basic fundamental ,but most skip it.

 

wow! you guys really amaze me with the knowledge everyone provides. by far, this is the best tech forum. thanx techies. although i thought about deducting time off your redline each time you shift... and that was all i was thinking about.

again, i appreciate it. bump.

anyone else?