hey guys so i got a suspesion technique sway bar that my friend gave me for free its for the rear my question what would the advantages be of only having the rear sway bar thicker than the front any info will help thanks

ps i already got da sway bars front and back cuz they are stiffer than the si's car doesnt get much body roll

 

Quicker turn-in. Less body-roll.

 

well thats obvious but why do ppl run a thicker sway bar in the back

 

Better rotation.

Umm, no. Not really.

 

they are a bit thicker

 

Did you get your question answered?

 

not really other than the obvious less body roll i know that i mean why do ppl run thicker swaybars in the back

 

I already answered that for you. There is no easier way to say it.

And the only DA rear swaybar that is thicker than the Si rear sway is the 4-door DA, and that's 15.7mm vs 15mm. So the difference is hardly noticable. I do believe only certain 4-door DA's got that though.

 

you use swaybars to tune the suspension. they add to the spring rate in a lateral change of motion (turning, or one side going over a bump). thus the less body roll. a secondary affect to this is actually reducing the "independent"-ness of independent suspension because youre linking both sides. so you get a point where you LOSE overall grip. however, this isnt always a BAD thing.

understeer means the front has less grip than the rear. oversteer is the opposite. this is a DYNAMIC situation. a car can be both oversteer at turn in, neutral at apex, and understeer at exit, as just one example.

cars typically understeer all around tho. to help reduce this understeer, you oversize the rear swaybar. this reduces grip in the rear but gains you better rotation to attack the turn.

for an EF, you really just want to add stiffness in the rear. this is also why spring rates are typically higher in the rear on a COMPETITIVE RACING car. and again, you use the swaybar as another tuning option to get better rotation. it acts differently than springs so it will do different things than springs.

and the DA integra rear swaybar (14.7mm) is smaller than the CRX Si (15mm). (they really dont fit the same either) the front DA bar is hollow and bigger but ive found it to be similar to the 19mm solid EF sedan bar. Si is 18mm.
https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/sway-bar-sizes-1894834/