That corner mass sure seems low, even if you subtract the wheel, tire, hub, rotors, etc.
The front is definitely McPherson style 1:1 or maybe 90% considering the top hat location. The rear is more like a double-wish bone style (multi-link)I'm wondering about the motion ratio - I'm reading that Macpherson struts motion ratio is close to unity 1:1 - I chose 0.9 just from thinking that since the spring is inboard it's less than unity.
To save you cost, here is the magnitude spring website: Magnitude PerformanceGood point on un/sprung weight. I'm doing a big roadtrip soon and one fat family member asked me to give her a ride. So I'll feel better about my 350lbs springs being put to use. Yes, the ride is stiff, I have no idea why Flatout sent me 350lbs springs when I asked them to configure the coilovers for maximum comfort, I should've checked and know exactly what I'm ordering.
I'm tempted to order new Eibach springs, 225lb(4k) front and 250(4.5k) rear.
The calculation works with the weights you provided and motion ratios: 0.95 Front, 0.79 Rear.
The only factor we haven't changed in the calculation is frequency, stayed 1.5 for both.
I think this video explains it well and it's from WhitelineYeah, the question is, I haven't tried the sophisticated method Jim is describing and attached the links to the most natural position when the car was lifted. Is that how do mechanics install links? I assumed so. Otherwise they'd have to jack up the control arm each time.
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Amazing, they also have $5 per spring clearanceTo save you cost, here is the magnitude spring website: Magnitude Performance
They're about $94/pair
I'd recommend playing around with the springs rates, find your happy rate then get the eibach. Eibach runs double or more per pair unless $ is not a problem
There's a review on flatout Outback GR Lite with 225 and 250 rate springs with very positive remarks. That person might be a member on here.
I ran 6k springs originally from BC and it was harsh going through railroad tracks, pot holes or road imperfections.
Welcome to the club!I just wanted to chime in as someone else that has purchased and just received a set of GR Lites for a Gen3.
Overall quality is good, but I didn't receive what I thought I was ordering.
I ordered there overload springs, I thought those would be 375lb front and rear.
Sins I often tow a motorcycle on the rear (finished a 2300mile road trip this fall doing just that) and I have the slightly heaver h6 (uncommon for that gen).
What I received is 300lb front and 350lb rear.
I also didn't receive any helper springs, and as you can see here:
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That means I can't set any preload on the rear shocks without setting them to max height.
Communication before sale was terrible but as far as I can tell they are the only company that sells these to fit my Outback.
But all of that is fixable, here's hoping I can get better support now that I've given them a bunch of money.
UPS didn't drop them off until it was almost dark, but tomorrow I'll start installing them.
It's worth saying that the Gen 5 is 400lb heaver then a Gen3 and has a different type of rear suspension.It's funny, looks like the Flatout guy ships random springs (at least they come in pairs) because I have checked today and I have:
Technically, you can swap the 250 to front and 350 to rear. Thatll swap the freq front to 1.5 and rear 1.7 or 1.8 which is also perfect for the "flat ride" effect for frequency match up.Welcome to the club!
Please let us know how did the install go!
It's funny, looks like the Flatout guy ships random springs (at least they come in pairs) because I have checked today and I have:
I didn't know I had 250lbs rear until now. I don't understand why he sent me 350lbs fronts because I placed the order when I had an H4, I didn't know I would upgrade to H6 so soon back then. Maybe he just randomly picks what he has at hand and 6-8 weeks lead time doesn't help either. The order confirmation doesn't contain any details so I can imagine we can only rely on his internal system based on sticky notes which is good until he opens a window on a windy day
Interesting point to think about. Can you please post a link to the drivetribe calculator?Technically, you can swap the 250 to front and 350 to rear. Thatll swap the freq front to 1.5 and rear 1.7 or 1.8 which is also perfect for the "flat ride" effect for frequency match up.
Using the calculator sheet from drivetribe, the rear/front ratio shd be about 1.5 to give a "flat ride". The RSR lowering springs for gen5 OB are also dedigned that way (3k fromt and 4.5k rear). You might need at least 12" springs for the front if you go lower than 300lbs though or else youll get coil bind
Interesting point to think about. Can you please post a link to the drivetribe calculator?
The rears are 14" and would work then.
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How would the rear perform with 10" springs from the front? The rears are now under a lot of preload just to achieve a small lift, with shorter and stronger springs, wouldn't it make the ride harsher? The double wishbone optimal preload should be 1/8" (3mm).
You can request a shock dyno from flatout. They're supposed to have a dyno graph sent out with each shock but I did not receive mine. They do have 20 points rebound adjustment all 4 corners. I'm not sure what the compression damping is tuned for as middle ground but usually they should cover +/- 2kg/mm spring rate range (on their FAQ) which is pretty standard for aftermarket coils.The only question I have is about the flatout are damped, especially rebound. Is it adjustable? I like overdamped suspension so if I were able to customize my suspension I'm not sure I'd go for 1.5hz unless I knew for sure that my shocks would give sufficient damping - I might shoot for 1.25 with firmer than stock shocks.
In my experience, with our car weight, I'd shoot for no more than 300lbs springs for comfort unless you're constantly loaded with heavy cargo and people or like to ride STI-style😄.The only question I have is about the flatout are damped, especially rebound. Is it adjustable? I like overdamped suspension so if I were able to customize my suspension I'm not sure I'd go for 1.5hz unless I knew for sure that my shocks would give sufficient damping - I might shoot for 1.25 with firmer than stock shocks.