Sykotic336

iTrader: (1)

I've been researching far and wide and can't seem to figure out which spring rates to get in terms with the bc racing extreme low coilovers with my wheel setup. I've heard of 14/12 16/10 16/12 but which would be good in terms of tucking on 20x9 20x10 225/35/20 245/35/20 nexen without rubbing considering shaving and clearing the front a arms. Don't mind it being stiff as long as I can clear without having any rubbing issues but I don't want it too stiff lol does that make sense? Any help would be greatly appreciated thanx

CAKETOWN

iTrader: (7)

I have the bc racing coils with 12/10 swift springs and it's very comfortable, not bouncey at all... that said i know guys go higher on the spring rates and it really depends what your goals are. If you''re planning on tucking you're gonna need to drill holes for the upper balljoint to clear.

Sykotic336

iTrader: (1)

thank you for you input yeah was planning on tucking and making holes for the upper ball joint with 12/10 being comfortable still (which is what I was trying to gauge) I think I might go a little higher in rates thank you for your input greatly appreciated

JM Auto Racing

iTrader: (1)

14/12 is a decent rate for the car as well. It won't be overkill.

PM me if you are interested!

getindavan

Im also interested in BC racing extreme lows for my gs300. I want to be able to slam the car on 20s for show but be able to also drive the car on 17s and 18s at a higher stance while i drive the car as a daily. What spring rates would i choose to make the car handle the best? Mountain driving, highway, and street. And would these rates work for being slammed on 20s? Also i drove my sister's stock IS200T F sport and i really like the way the car feels. Could a GS300 on BC racing extreme lows feel similar to my sisters is200T?

2JZS161

18/16 on swift springs is a good spring rate for driving low while still retaining a smooth ride quality

JasGS350

iTrader: (7)

I suggest 14/12. I have 12/8 and front is too soft. I'm barely tucking 19's and it bottoms out every so often.

ArtME

Yea 14 12 sounds right I had 8 10 on bc but too soft so I got stance 18 19 but they are more track oriented lol

Neil64

BC Racing coilovers come with 10K/8K off the self for GS400/430s. Has anyone tried them with those springs or possibly even 8K/6K which is still higher than the stock coilspring rate based on Tanabe's NF and DF 5-15% increased rates?

For that matter, does any know what the actual Lexus coilspring rates are and if they are linear or progressive?

I am trying to lower the car about 1.5" while maintain the OEM ride quality.

JM Auto Racing

iTrader: (1)

Most people on this platform go with either the 10/8 or 12/10. I don't think i've ever seen anyone order them with 8/6

firelizard

iTrader: (1)

If you want 1.5"ish and soft ride just get the Tanabe NF210 or DF210, that's exactly what they are designed for.

10k/8k is still pretty soft though, if you wanted to go lower than the Tanabe springs offer but still not be super low, the BC coils in that stiffness would be a good setup.

Neil64

I am strongly considering NF210s with Bilstein B8s or possibly DF210. I am concerned about the Bilsteins being noticeably firmer than OEM and magnifying/adding to the increased spring rates of any lowering spring. KYBs seems to be the only other option and not many are happy with their performance and longevity. They aren't designed for reduced travel (lowering springs).

It also comes down to price. With springs, shocks, mounts I am about $150 away from the BCs. If I can get the BCs to drop about 1.5" and ride and sound like OEM, last 100k mile I'd be happy. But various shop owners/tuners have told me that coilovers not named KW or Ohliens never ride as good as OEM or a soft lowering spring. I called BC who says their off the shelf spring rates are 150% of OEM spring rates. He recommended 8k/6k springs to get close to OEM ride quality. But everyone here seems to go higher rather than lower on their spring rates. I am left believing this is because they are lower than 2" from OEM or they want improved handling. I don't want to get 8k/6k only find out that I am under sprung and bottom out.

Also considering the Bilstein coilover system but they are pretty expensive.
The Tein Street Basis Z sound like a nice option but many non Lexus users think they are under sprung. I still am considering them though.

I think I have read every thread about this topic on this forum and I still can't pull the trigger in any direction.

Thoughts?

firelizard

iTrader: (1)

A Bilstein Tanabe combo will be noticeably stiffer than stock but still far less than even 8/6 BC coils. Their dampers are made to handle spring rates from 10/8 upwards. Tanabe springs are like, 6/5 or something. Much softer (it's on their site if you need the exact specs)
Stiffer than stock is definitely a good thing because one of the biggest shortcomings this platform has is that everything is soft. Way too much compliance in every part of the stock suspension makes handling pretty uninspiring.

Regarding KYB struts, I'm having no issues so far. I have been on DF210 and Excel-G for three years, daily driven, year-round and they have held up. They don't bottom out and the springs are not too stiff for the struts. Lifespan might be reduced over the long term, but so far everything is working well with that setup.

Neil64

FireLizard,

Did you notice a fair amount of settlement with your DF210s?

firelizard

iTrader: (1)

No. If there was any, it's not noticeable without measuring. The stance is the same as when I first installed them.