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Old 12-01-2007, 10:39 PM   #1
roninsoldier83
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Default Drop of JDM Pink STI springs on '06 STI, as well as various other JDM Pink questions

Alright, after a good deal of searching, I've found several different different claims for the drop on JDM STI "pinks" on an STI. I've seen claims from 10mm, to 20mm to 25mm... just trying to figure out which is correct?

I'm not really looking for much of a drop, I would like to keep as much ground clearance as possible, yet swap over to rates that are more fitting of the STI's stock struts, as they seem to be a little undersprung from the factory. I believe the JDM Pinks have rates of 257/217 lb-in, which is a mild increase from the factory spring's 224/194 lb-in, without being too harsh or overworking the STI's stock struts.

Will the '06 STI on JDM Pinks have the same drop as the '04-05 STi? Any considerations to be taken? Should they leave enough suspension travel to avoid hitting the bump stops during hard cornering? Lastly, since the front spring rates are increased slightly more than the rears, will this change the suspension's understeer/oversteer bias?

Any information, and/or experience would be greatly appreciated! Thanks in advance
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Old 12-02-2007, 01:22 AM   #2
scottjua
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I'll revise this post tomorrow with some info: Just got back from the track today and I am wiped out, but here's a pic to tide you over:

JDM Pinks on stock struts w/RCE camber plates (lowering) 245/40/17 Advan Neova AD07s




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Old 12-02-2007, 11:33 AM   #3
roninsoldier83
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Wow, that looks really good, although it appears to be more than a 10mm drop. Nice overall setup! How did it perform at the track? Any problems hitting the bumpstops? Any rubbing with the 245's and pinks?
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Old 12-02-2007, 12:33 PM   #4
scottjua
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Bumpstops... I'm conflicted now as on the street only I used to think I would recommend cutting the front bump stops or getting the Prodrive ones. I was lazy and didn't bother, and although it doesn't bother me, on the street in one particular corner near my house I can feel hitting them under hard cornering load and the car wants to rebound off of them a little causing more understeer. This is MINOR mind you, but there. HOWEVER, in all other cases and on the track, there isn't enough of an abrupt bump to actually compress hard enough and suddenly enough to cause the same effect. They were super linear at the track yesterday and handled like a dream. I also have whiteline sways (Whiteline 27 Adj F sway, Whiteline 24 adj R sway) and the car was neutral and very very awesome! My instructor pointed out how great the car felt as well. So maybe now I'd say cutting the bump stops is not necessary at all after driving it more and in the conditions I really care about.

The lowering is nice in my opinion... not too low... not raised like stock... this is where it should have been stock I think. From what I remember reading it was a 20mm drop without the lowering RCE plates... with the plates lowering just a tad more.

The ride is stiffer for sure, but I wouldn't say its bad, and the bobble head is not an issue I ever had a problem with personally. I hate the stock seats with a passion though.

Also, NO rubbing ever in any circumstance with these tires.
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Old 12-02-2007, 12:48 PM   #5
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Wow, great insight, thanks for sharing! IMO, you have an ideal setup, glad to hear no bumpstop problems or rubbing when tracking the car

I hear you about the seats, why Subaru would release an apex carver like the STI and not add more bolstering is just beyond me, especially when they already have seats with extra bolstering (JDM STI), they wouldn't have had to even produce a new model seat, just re-use the JDM version... *sigh*

So overall, the 20mm (around 13/16 inch IIRC) drop was more accurate, good to know. Of the 3 major suspension mods you've done so far (JDM pinks, Whiteline sways & RCE plates) what would you say was the most noticeable/helpful at the track? I'm assuming tires obviously made the most significant difference, so out of just the 3 suspension mods.
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Old 12-02-2007, 03:28 PM   #6
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I really like my STi Pink/STi Red strut setup. It did well at the track and rides pretty decent on the street.
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Old 12-03-2007, 12:56 AM   #7
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Quote:
Originally Posted by roninsoldier83 View Post
So overall, the 20mm (around 13/16 inch IIRC) drop was more accurate, good to know. Of the 3 major suspension mods you've done so far (JDM pinks, Whiteline sways & RCE plates) what would you say was the most noticeable/helpful at the track? I'm assuming tires obviously made the most significant difference, so out of just the 3 suspension mods.
That's hard for me to quantify really. As I had the springs and RCE plates on at the same time. I can however speak to track experience in different phases;

1. All stock STi on track w 38F/36R cold psi in tires: A little understeer, a lot of body roll, brakes fading at the end of my first track day with it

2. All stock STi suspension, 38F/36R cold psi in tires, alignment= -1.0 F camber, factory camber in rear, 0 toe, SS brake lines, Cusco master cylinder stopper, ATE super Blue, Carbotech P+ pads: HUGE improvement in handling bias... car still pitches and rolls a lot, but the added camber in front was amazing in the way it seemed to hold grip in turns compared to an almost 0 or positive camber from the factory. New brake upgrades made more braking than I needed, but allowed me to dive DEEP into turns with no fade all 100% more confidence

3. All stock STi springs/struts, 38F/36R cold psi in 245/40 AD07 tires, alignment, brakes, added whiteline sways: Sways pretty much eliminated large body roll and brake dive, (although the harder setting in rear made the car rotate too easily for me) larger tires added more grip of course but sways and tires didn't feel as significant of a difference as the initial alignment did, but seemed to bring a more focused feel to everything.

4. JDM Pink Springs, RCE plates, new alignment (-1.7 F, -1.5 rear, 1/16th toe: EVEN tire wear on street), same tires as previous, rear sway in softest position: More camber and stiffer ride in conjunction with body roll quelled by the sways, plus awesome tires, and everything else made me feel like there was NO weak link in the machine any more. I was completely confident in the car's ability to translate my level of driving for the most part. Once I got faster and faster due to new confidence even in semi wet and full wet track conditions, I felt that short of actual race rubber, the car is not holding me back in any fashion. The only way to get faster was for my fear level to catch up with the abilities of the car.

So that long diatribe was an exploration in sorts for the answer to your question. I guess... the most significant mod for feel and exploitability would probably be the ability to add camber. So maybe the RCE plates would stand out. But honestly since I can't really separate them from a spring install as far as feel on the track I'd have to say they should go along with springs in making the a overall larger impact. Alignment and sways would come in close second as a tie.

But I would say a secret sauce to all of them (mods) is the ability to easily change everything and fine tune each mod you do by adjusting tire pressures. The best part is its free and takes seconds.

gosh... did I ramble or actually say anything of merit????
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Old 12-03-2007, 01:53 PM   #8
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my car (04 sti on stock struts & jdm pinks) looks about the same without the RCE lowering camber plates.

and from what i know, only the rear bumpstops need to be trimmed.
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Old 03-05-2008, 12:11 PM   #9
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bumping up an old post....would anybody recommend the jdm pinks for a daily driver because i want to lower my car and i dont want a really stiff ride or too much of a drop thanks
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Old 03-05-2008, 01:27 PM   #10
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If you don't want stiff springs and you don't want much of a drop, then no, you shouldn't get JDM Pinks
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Old 03-06-2008, 02:07 AM   #11
scottjua
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Yeah... its stiff on JDM Pinks, but I would say its great for daily driving. My wife doesn't mind at all... at least she never voiced a complaint. The seats are the killer for me... not the springs.
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Old 03-06-2008, 02:36 AM   #12
USCTrojan4JC
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Quote:
Originally Posted by bmak21 View Post
bumping up an old post....would anybody recommend the jdm pinks for a daily driver because i want to lower my car and i dont want a really stiff ride or too much of a drop thanks
JDM pinks are fine on my car with the Koni adjustable strut inserts set at nearly full soft. Otherwise, it really depends on the quality of the roads you're driving on.
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