There are 2 OEM sec. reduction ratio's:
AP1 (F20) = 1:1.160
AP2 (F22) = 1:1.208

Nyther Posted on Sep 10 2007, 01:32 AM
Put an AP2 sec reduction in an AP1 gearbox and you'll get a "final drive" of 4.27
I say "final drive" because those gears don't actually change but it would take a 4.27 final drive ratio to make an original AP1 driveline to behave like that.
1.208 x 4.10 = 4.95 (OEM AP2)
4.9528 / 1.160 = 4.27
1.160 x 4.27 = 4.95 (AP1 with imaginary 4.27 final drive)

Now.. AJ clames to change the ratio with just this one gear to 4.46
How does this work?
How can you just change one gear (of a set of 2)?
The distance between the shafts didn't change.
If the sec reduction shaft didn't change how can you make it mesh with another gear to create another ratio?

Mechanically kinda strange IMO.

 

Would coupling this with 4.56 or 4.77 rear gears act as a multiplier of any sort, or simply be equivalent to something like a 4.9/5.10 gearing?

 

MikeyCB Posted on Sep 12 2007, 11:01 PM
Changing the sec. reduction ratio changes the overall gearing, the same as changing the final drive ratio does, so yes.

Besides that:
How can one change gear #1 without changing gear #2?


Sec reduction shaft & gear #2 are one, as in one part.
It may be the gear is crimped on the shaft, in any case not changeable.

 

can anyone figure out this puzzle?

 

uhhhhh

Thanks for the response but I'm still unclear:

MikeyCB Posted on Sep 12 2007, 11:01 PM
SpitfireS Posted on Sep 12 2007, 03:22 PM

Yes to which part?

 

Interesting...

 

more trouble than it's worth? unless you couple it with a 4.77 rear gear set and get some sick accel

 

if their claim is indeed true and accurate, making the final gear 4.46...and installing it is easier than installing a final drive...

i am seriously considering this mod.

can anyone explain how/why their claim is true, considering spitfires puzzle?

 

MikeyCB Posted on Sep 13 2007, 12:42 AM
[QUOTE]Yes to which part?

 

IMO the new sec. reduction ratio is 1:1.265
But I don't understand how they create that without changing both sec. reduction gears.

It's like taking a 4.57 pinion and make it work with a 4.10 ring gear.
Okay.. that's a little over the top, but that's what they are doing IMO.

Creating a higher ratio and not changing gear #2 on the shaft, gear #1 has to be bigger, more teeth.
How does that fit?

Mirakle workers.. those people at AJ's