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Brakes & Suspension Forum sponsored by The Tire Rack |
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06-17-2014, 02:45 PM | #1 |
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2015 WRX and STI suspension TECH thread.
Wanted to start a FIFTEEN suspension tech thread to keep all of the misinformation to a minimum.
I will start with some basics and write a review impression piece later. ( had the privilege to do a back to back and I mean back to back comparison a few months ago and I found it very interesting. STOCK SHOCK DYNO COMPARISON 15 WRX and 15 STI are same for rear. motion ratio rear 0.78 STI fronts are mono tube WRX front is twin tube BOTH REARS are TWIN TUBE. --------------------------- measurements below are for WRX bump front 48.1 mm (1.89 inch) droop front 88.9 mm (3.5 inch) 44.5 mm front bumpstop bump rear 51mm (2 inch) droop rear 66 mm (2.6 inch) 55 mm rear bumpstop _____________________________________ STI front spring rates 5.8K STI rear spring rates 5.3k WRX front spring rates 5.8K WRX rear spring ratees 5.2K STI front sway bar 24mm STI rear sway bar 20mm WRX front bar 24mm (23mm measured on press car FEB 2014) WRX rear bar 20mm
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Last edited by RaceComp Engineering; 12-19-2017 at 06:42 PM. |
06-17-2014, 02:46 PM | #2 |
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UPDATE : 2016 WRX LIMITED AND PREMIUM CONFIRMED!!!
2016 WRX LIMITED AND PREMIUM MODELS ARE COMPATIBLE WITH RCE YELLOWS. Last edited by RaceComp Engineering; 09-16-2015 at 10:58 AM. |
06-17-2014, 02:46 PM | #3 |
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reserved.
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06-17-2014, 03:51 PM | #4 |
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can you confirm that the WRX and STi are also the same fitment as far as the knuckles go?
as in: the 2015 STi front shocks will now fit on the 2015 WRX the 2008+ STi front shocks will now fit on the 2015 STi the 2008+ STi front shocks will now fit on the 2015 WRX i know the WRX is now the 5x114.3 bolth pattern, and wasnt sure if that translated to the knuckles and bearing sizes too. |
06-17-2014, 07:57 PM | #5 |
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Subscribed for the RCE Yellow drop springs !
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06-17-2014, 07:57 PM | #6 | |
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Quote:
Myles |
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06-18-2014, 08:52 AM | #7 |
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A couple of thoughts from Andy @ RCE:
1. The shocks are pretty good. Lots of damping available and it's a quality curve, especially STI. 2. Spring rates are the highest ever for STI and WRX in the USA. And both cars still ride relatively well. See note 1. 3. I'm not convinced all coilovers will be an "upgrade." See note 1 and 2. 4. Less than 5mm of travel before engaging the bumpstops up front (on the WRX). I'm not convinced all lowering springs will be an "upgrade" either. 5. Softer rear spring rate is interesting with the lower motion ratio in the rear. You'd expect more understeer from that (and there is some) but it's not as bad as you'd think. 6. Swaybars are BIG. Those are serious bars from the factory. All in all, damn good job Subaru! Yes there is room for improvement for those looking to get a little more serious but you can tell Subaru has been focusing on handling the past few years and it's paying off. - Andy |
06-18-2014, 09:35 AM | #8 |
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point 4.
are the bump stops that long? is subaru moving to a setup where the bumpstop is supplementing the spring rate, and not just for shock protection? dont some other car manufacturers do somthing like this? i thought i recalled some german/european cars did this pretty often. |
06-18-2014, 09:57 AM | #9 | |
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Quote:
I have other theories as to why they've moved in this direction but would love to talk to one of their engineers. Subarus over the last decade have been bumpstop active but generally don't run such high main spring rates, so in that sense it's new. The BRZ relies on the bumpstops but is sprung super soft. It does make the valving of the dampers a little more interesting for both cars. - Andy |
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06-18-2014, 10:02 AM | #10 | |
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06-18-2014, 10:15 AM | #11 |
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Yeah, and a solid alignment will get you far on it's own too!
But a solid alignment + some good MILD drop springs with a little more rate... Really though, these dampers can support a lot more spring rate easily. Not a ton of headroom in the rear, but tons up front. - Andy |
06-18-2014, 12:38 PM | #12 |
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Have you guys thought about (or tried) throwing on your STi yellows (5mm drop IIRC) on the 2015 WRX/STi? they should fit right?
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06-18-2014, 01:29 PM | #13 |
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Previous gen springs may physically fit, but I don't think that you would get the ride heights you'd expect. I'm not entirely sure...Myles might have a better idea of this.
- Andy |
06-18-2014, 02:01 PM | #14 |
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I have had BOTH GR STI shocks next to 2015 STI shocks and if you put 15 shocks on your 2008 + you would be lowered by about 25mm ! We haven't tried it, but with the new dampers being significantly better than the previous generation, if the lowering was even front to rear you would have a SOLID set up.
EDIT: 2015 SHOCKS are a FULL INCH SHORTER assembled on the bench than 2008-2014 STI. With that said it goes without saying that putting 08+ on the 2015 would result in raising the front at least and possibly the rear. I found that from an "all around " stand point the 2015 WRX shocks felt the best. A decent amount of damping WITHOUT the overly active mono tube feeling that some might not like about the STI at speeds below 30mph. So yes you could actually install WRX shocks on your STI ( both 2015's) and our soon to be released "Functional Lowering springs" and have a solid performer without the typical low speed feeling the STi has. Let me be clear, I dont mind this feeling but some have already complained about the STI feeling super stiff at low speeds( mph). THe other thing we will test next week is installing our GTWORX BILSTEIN rear shocks ( mono tube with cir clips for height adjustment) on the rear of a 2015 and testing it with our new springs. Could be a way to REALLY bump up the stock 2015's with some SOLID spring rates and for not too much money. The GTWORX BILSTEINS have +10 up or down range of adjustment on height so this could work. We are working on this already. I too and super excited about the "New Twins". Subaru REALLY did us a solid on the shocks and spring rates. Just adding T2's to my WRX and I have 6.9 caster ! Myles |
06-18-2014, 02:45 PM | #15 |
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And here is a comparison we did a while back between the REARS ONLY on the WRX and the PREVIOUS WRX models. MASSIVE difference.
You can't tell me Subaru project engineers weren't following the aftermarket on rates and what needed to be done chassis wise. |
06-18-2014, 05:11 PM | #16 |
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Some good data gathered here! Subaru have definitely stepped up their suspension game for this model year. I think from a performance road car standpoint, the stock stuff is looking pretty damn impressive.
A bit more rear bar maybe to help with rotation in slower turns, but other then that, damn fine. What sort of alignment specs are we seeing with the factory stuff for this MY? You would think Subaru would run a bit more aggressive specs, given all the other improvements. My Fiat Abarth stock runs -1.5* up front from the factory haha. You'd think on the STi at least they might run a bit more aggressive. Especially considering the difference it makes in feel -Anthony Last edited by Vaughn Performance; 06-18-2014 at 05:17 PM. |
06-19-2014, 12:04 AM | #17 |
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I Was able to get -1.8 front camber ..BUT…thats lowered only .50".
Thats also with 6.9 caster too. So that feels REALLY good. Myles |
06-25-2014, 02:15 PM | #18 |
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The 2015 STI struts with all that front low speed rebound are going to be AWESOME in transitions/slaloms for auto-x.
- Andy |
06-29-2014, 08:53 AM | #19 |
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Great information!
Question, would the 15 sti springs lower the 15 wrx a little while maintaining an (almost) stock spring rate? I ask since it seems the sti body sits a tiny bit lower to the ground than the wrx yet with a slightly taller tire from the factory and also less wheel gap. Lower spring being negated by a taller tire? A small drop like 0.5" seems to cosmetically make quite a nice difference if this is the case. Interested to find out more about your "functional lowering springs" though. Thanks for the shock dynos, they look great! |
06-30-2014, 02:41 PM | #20 | |
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07-03-2014, 02:52 AM | #21 |
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When are you guys planning on releasing lowering springs (yellow and black) for 15 WRX? Late Summer?
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07-03-2014, 03:35 PM | #22 |
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07-03-2014, 04:04 PM | #23 |
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07-03-2014, 04:21 PM | #24 |
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07-03-2014, 05:32 PM | #25 |
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Bone stock. I haven't done anything to the car yet, but I probably look into that option you suggest. I try to fit 18x9.5 +38 in there, but that's probably a lot of work vs +45. If camber is more adjustable than out going model, that's a good thing.
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