edit: so i took to long to post....destroyer has covered a few of my points.
ive had them both, and ae86 is far better.
i am a convert as i thought the s13 stuff was great at first, but as i explain i realised it wasnt so great.
ive had my ke70 for arond 4yrs now, put s13 gear straight in when i got it, it was cheap, brakes are awesome, but it never did quite feel right.
i tried 3 different pairs of coilovers to try and get decent damping and suspension droop. the last set of coilovers i had were the best of the lot, 8kg with kyb AGX inserts inside of bridgestone coilovers. it just never felt quite right, the steering feel is not linea from lock-lock, it tends to get "harder" to steer close to full lock.
before anyone sais "s13 gives to much track" this is EASILY fixed by BOLT IN R31 LCA's, brings the track back to about 10mm over stock (Same as the much loved xt130 arms). i have personally done it on my mates ae86, works great at bringing the wheels back into check.
so onto the ae86 gear:
at my whits end of the setup not feeling right, i bit the bullet and went for a complete ae86 JDM yo setup, jap 234x18mm brakes, with cheap sw20 rear kyb excel G shocks with 6gk springs, 40mm RCA's, weld on coilover kit, 6kg springs, brand new discs, calipers (reco'd), brake pads, tie rod ends, rack ends.
the entire front of my car was brand new stuff. and it is fantastic. i can feel the shocks arent the greatest (you can't expect much from under $100 each), but it is very good. feels like driving a "normal" car, the steering is normal, it gives great feedback. and it takes the bumps very nicely. while gripping like crazy to the road.
and it is sooooo much better than the s13 gear. just feels "normal" and gives you more confidence in the car (i find anyway).
the only downside of the ae86 gear is that the stock jdm brakes (vented 234mmx18) are certianly not as good as the nissan stuff (ca s13 brakes are 250x20?, and every nissan brake pretty much bolts on...) but i reckon you can get pretty close with some good pads and some good fluid (have a chat to GSL rally sport). these ke70/ae86's are pretty light so you don't neeed much to make them stop (I'm just a sucker for huge brakes!!)
i have hit up the mountain roads and had the brakes fade once or twice, but in general the 234x18mm's do a very good job. i reckon if you were to hit the track and intending to lean on the brakes ALOT (ie proper circuit racing, not really drift...) then you would definately need better brakes, go some wilwoods or the RX7 option. but for a street car the 234x18's are more than enough.
Edited by ke70dave, 15 March 2011 - 12:55 PM.
Everyone is entitled to their own opinion, but not to their own facts.