JDM gear ratios visualized

[docjohn]

From my observations the bigger power guys are fine with the US gears and RP.

 

[RYU]

An open ended question but I have all the parts for the JDM gears from Motormouths thread, however since I am twin turbo, is there still the value in installing them?

It's not an easy question to answer because there are a lot of "it depends". I've literally tried all 6 or so gear sets. Except anything shorter than a 4.4 final drive.

Turbo itself is it's own animal as well. It also depends on the characteristics of your turbo.

So many variables for you to consider. Try it w/o the gear swap first?

fwiw: for anything with instant torque (e.g. NA or SC, and some turbos, but not really) I like the short gears for my driving conditions. For wide open roads like Texas or the Midwest... i'm not so sure. USDM sounds more appropriate.

 

[RYU]

For example, this road is literally my backyard. It's a 5 min drive to the start of this hwy. For these types of roads I like the 4.4 but we also have longer higher speed roads like the famous Angeles Crest Hwy which is 35 mins drive for me. This is why I settled on short gears, high torque, and the middle ground 4.23 final (not the stock 4.06.

You have to consider what kinds of roads you drive the most IMHO.