Hey all, so I'm looking into buying yonaka coilovers (again). I really liked them the first time but was wondering if I could swap the rear and front springs with each other to help reduce understeer .

They come with 12kg/180mm up front at 6kg/200mm in the rear. It would appear that they would be able to be swapped over no problem. If I remember correctly having a stiffer rear end will help the car turn in more and help eliminate understeer. One of my concerns is that since it IS half of the stiffness that it will cause problems being under the extra weight of the engine.

The car is my daily but I wish to make it track oriented

I would like real information about how the car handles with a stiffer rear end from someone who preferably tracks or autocrosses. This is not a beginner I don't know what I am doing post I understand just about everything that goes on with cars so all the people who "think" they know best because they drive a slammed hatch on eBay sleeves and knockoff sw888 pls stay away. I simply want to hear about other people's experiences with that stiff of a rear in comparison to the front .

Thank you all

 

I'm running 560lb front and 340lb rear with Tein Street Flex Z coilovers. In Autocross it definitely understeered so I threw the ek9 rear sway bar and ASR subframe brace to help neutral it out. The EJ hatchbacks do not have sway bars to begin with so you can definitely feel the difference. I personally would not run that stiff in the rear, especially for a daily And in motorsport/track usage I would imagine that difference in front to rear stiffness would make it oversteer a lot more than you would like.

My end plan is to run wider or a different comp tire in the front compared to the rear along with my rear sway bar. That way, I get the rotation I'm after without making the car tough to live with.

Keeping it softer in the rear helps with day to day livability. Any stiffer in the rear and I would consider it being a weekend/track only car.

From what I've read most people who autocross stop at 500-600lb in the rear and ~500lb in the front.

There are brands that allow you to pick your own spring rates, I would go that route instead of buying and swapping the springs of cheaper coilovers. Probably just asking for trouble doing that.

 

are you running parkinglot or track based autocross??
what are your other suspension modes? (suspension like most other things are a complex balance, the parts have to work together)

my autocross civic is currently on 560lb (10k linear) front and rear, it's far from a nice ride for a daily.
12k in the rear would be very harsh, not to mention that the valving in the rear shocks will be VERY overwhelmed, so much so that bouncing will be likely.

the fronts, the springs will likely hold up the car, but the shocks will be stiff, again ride quality would go out the window.

as Ericjergs stated, if you like the ride quality you are at for the street but want a little more rotation, go with the rear sway option.
be sure to balance the rear sway with the front sway or you'll become unstable under braking or bad road conditions on the street.

 

Running 450/350 lb on my Progress CSII coilovers on my full weight EG, not uncomfortable on the street (IMO) and still offers plenty of stability for weekend warrior style driving. Have yet to attempt autocross or HPDE on them.