Will a 23mm make a big difference over the 22mm?
Will the 23mm work properly with the BSQ reinforcement kit?

 

forgot the exact mathematical formula, but yes there should be a noticeable difference with the 23mm up from 22mm

 

I swapped out my 22mm for the JDM 23mm. This was on my ITR so I did not need a BSQ kit... but everything is working fine. You will probably need new bracket bushings, but you can re-use the endlink bushings.

As for performance, I believe the increase in diameter of the sway bar results in an EXPONENTIAL growth of what it can do(?? my wording sounds off). There is a formula out there, can't recall how it worked again.

As for personal experience, the tail did seem a BIT more tail happy.

 

When you guys say "tail happy" what do you mean exactly?

 

im thinking it has a higher tendency to go out.

 

exactly!
the initial turn in feels a bit more responsive as well.

 

stupid question - are the JDM and USDM front strut tower bar the same exact mm?

 

We're talking about the REAR LOWER SWAY BAR. Not front/rear upper strut bars.

 

JDM ITR and USDM- front strut tower bar is the same bar.

JDM 96spec ITR and USDM ITR- front sway bar is the same. 24mm
JDM 98spec ITR- 25mm

JDM 96spec ITR and USDM ITR- rear sway bar is the same. 22mm
JDM 98spec ITR- 23mm

 

I don't have the formula w/ me now, but it's about a 20% increase in stiffness. That's a fair amount from 1mm of increase in diameter.

 

i know that SMART GUY i just wanted to ask instead of start a whole new topic for a stupid question. THANKS

 

got it!

torsional stiffness = (swaybar diameter)^4

so to find how much a bar will increase the stiffness, it's

increase in stiffness = (new diameter / old diameter)^4

ex. (23mm/22mm)^4 = 1.2 so it's a 20% increase

just for kicks:
(22mm/14mm)^4 = 6.1

so the ITR bar is about 6 times stiffer than the stock GSR swaybar