Recently had my car full of 5 adults. 4 H.S. age boys and me and have Koni Sport Yellow's in rear (adjusted to med-stiff, and STOCK springs all round) and at fairly small dips/bumps the car was pretty much rubbing the rear tires, and even have the rear fender rolled up.
Does anyone know what the 'stock' spring rate is for a '02 IS300 4dr?
I really don't want to lower more than an inch, but i DO want it a LOT stiffer than what it is now.
BTW, car is 3500# with only me, tank of gas in it.

Memphis area ISN'T known for excellent drivers and or well maintained roadways. So I don't want to be beating the car up. (I don't mind a good stiff suspension, but don't need 'full race')

I've read Eibachs and H&R sites but they seem to lower more than what I'd like.
I'd also like to have a staggered wheels at a later date, like 17's in front and 18's rear to get a little more dia to help the rear gear, since I mostly drive highway.

Does anyone make/sell springs that can do this?
I'd really not want progressives, since they pretty much stay at coil bind for the first 1/3rd, THEN start being stiff.

Thanks for any GOOD input.
E

 

Coilovers you can pick whatever spring rate (can change anytime) and adjust ride height to what you want (when you go to your staggered setup)

 

Had 'coil-overs' on Hondas since the early 80's.. NOT the best ride that I can remember.

I've always had a better ride and component reliability with a quality shock/strut and heavy(er) spring.
(although, when I was doing this back in the 80's, you had to swap springs from another model/car -mostly used- OR
pay outrages prices for springs that were RACE ONLY and would sag after a year or so, and ALL you're bushings would need replacing)

I'm scratching on 60yrs old and don't need to be beat up, killing the pleasure of 'spirited' driving.