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Old 02-13-2018, 09:26 AM   #1
aldecam
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Default 2007 STI: Looking for great set of Coilovers. AST 5100 or FEAL 441

Hello,

I have an older 07 STI.

The car was a daily driver with the occasional track day, now itll be relegated to the occasional around town driver with more dedicated track time.

Iíd like some input from the community.

Iím looking for a good versatile coilover package. Something thatís composed on the street but can be properly tuned for a twisty trackday.

Iíve heard good things from the AST vendors and customers, they seem like a great, high quality package. Iíve heard similar accounts from the FEAL 441 crowd.

The biggest difference I see is price point.
Youíre saving almost $1k with the FEAL Set.

I understand that both are monotube, inverted systems. Where is the real difference between both sets and are there other brands that are competitive to these purveyors ?

Thanks.
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Old 02-13-2018, 10:35 AM   #2
T-37
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I would lean heavily towards AST. They also list a dual digressive piston option. You can also look at RCE Tarmac 2s, 1s or 0s or KW V3s, V2s or V1s in that same pricerange

Something to take into consideration is that the ASTs, and RCE/KWs do not include tophats/camber plates, so you will have to either reuse the stock ones or purchase them.
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Old 02-13-2018, 11:47 AM   #3
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The Feal are not inverted which means you do not have to worry about the extra maintenance of greasing the housing in between services. the 441 also include front camber plates, rear top hats, and an available rear camber plate with spherical bearings at all corners. The valving on the standard 441 has a slight digressive curve since that seems to be a concern. Typically you would not want a road car to be extra digressive as it will be very firm at slower speeds and can be harsh on the streets. Couple that all with Swift springs standard at a much lower price it's one of the best "bang for your buck" option available.

I suggest looking into some reviews of the Feal's to see what NASIOC thinks about them. There are a ton of thorough reviews and most are overwhelmingly positive.
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Old 02-13-2018, 01:21 PM   #4
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I would say you are comparing two different levels of suspension. The 4100 AST set would probably be more apples-to-apples and frankly, you couldn't go wrong with either set.

Two benefits that Feal suspension will have is a company that is highly responsive to communication from the customers and easier access to rebuilds.

The quality is also there with AST, but all your communication/rebuilds will essentially be going through a dealer rather than direct.

I believe rebuild costs are comparable. If you can find a lightly used set of either one at a killer price, that would be an easy way to decide.
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Old 02-13-2018, 02:03 PM   #5
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Feal rebuilds are $100 per corner and turnaround is 5 business days, we also rebuild AST for $175 per corner. I am not sure what the AST are through AST directly or through other dealers to be honest. Most rebuild places like PSI are quite a bit more expensive than us and we have been finding ourselves with more outside brand rebuilds than ever before.
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Old 02-13-2018, 03:17 PM   #6
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Might as well consider it $350 a pair for AST - last time I had mine rebuilt they wouldn't do only one corner even though I only had a single corner with a seized adjuster.
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Old 02-13-2018, 04:09 PM   #7
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I would strongly consider the Racecomp Engineering Tarmac 2. They have those pretty dialed in for these cars.

Quote:
Originally Posted by mrsaturn7085 View Post
I would say you are comparing two different levels of suspension. The 4100 AST set would probably be more apples-to-apples and frankly, you couldn't go wrong with either set.
AST doesn't make the 4100 anymore but did lower the price a bit on the 5000 series.
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Old 02-13-2018, 07:50 PM   #8
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Quote:
Originally Posted by mrsaturn7085 View Post
Might as well consider it $350 a pair for AST - last time I had mine rebuilt they wouldn't do only one corner even though I only had a single corner with a seized adjuster.
We can do a single corner but strongly recommend sending in pairs. You don't want one side with broken down oil and one side like brand new, it won't feel right when driving.
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Old 02-14-2018, 12:03 AM   #9
aldecam
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Default 2007 STI: Looking for great set of Coilovers. AST 5100 or FEAL 441

Great stuff.

Thanks for all the info.

@ Mike_Feal , thank you for chiming in and offering great pricing on rebuilds, even for the AST sets.

I was doing some research on the AST 5100 with the DPP option, Iím not entirely sure on its benefits for my needs as I was also looking into the 441 with either the road race or max travel options.

As someone mentioned above concerning the 4100. Theyíre not made anymore. I remember the TiC tuned SST 4100 Which were basically the best coilovers for the GD chassis in those days. Iíve also great things about the Tarmac 2s and free rebuilds are hard to ignore.

But technical write ups are hard to put up against real world experiences.

Thanks.
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Old 04-17-2018, 12:38 PM   #10
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Did you end up pulling the trigger on something? I'm researching into the Fortune 500 with the Swift spring and reading a lot of positive reviews with an upgraded radial bearing. Even spoke with a local shop and it's a pretty popular setup. Just was interested in what you decided to go with.
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Old 04-19-2018, 12:43 PM   #11
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Quote:
Originally Posted by BoostinChick View Post
Did you end up pulling the trigger on something? I'm researching into the Fortune 500 with the Swift spring and reading a lot of positive reviews with an upgraded radial bearing. Even spoke with a local shop and it's a pretty popular setup. Just was interested in what you decided to go with.
Just curious, what are the 500's with the Swift upgrades going for now?
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Old 04-19-2018, 06:03 PM   #12
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Quote:
Originally Posted by Mike_Feal View Post
Just curious, what are the 500's with the Swift upgrades going for now?
From most of the vendors I looked into ~$1,500 with the Swift or Hyperco springs. That's not applying any forum or local club discounts. They are very modular in all the upgrades and options you can add onto the shock body (like air-bagless lift) and an electronic damper controller.
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Old 04-20-2018, 09:23 AM   #13
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FWIW, I've had a set of AST 4100 on my 07 STI for a very long time now. It's a street car and I live in a rural area that puts a lot of stress on the suspension. Looking back I'd say the ASTs really aren't meant for that kind of duty and they are considerably past needing a rebuild. Before you buy the FA coilovers I'd try to find someone who has had them on the car for 3+ years to see how they hold up. I'm taking off my ASTs and going with a set of Feal Max Travels very soon. I'll have the ASTs rebuilt and sell them and hope the Feal reputation for service and quality holds up - I think it will.
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Old 04-20-2018, 06:47 PM   #14
Mike_Feal
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$1500 to add on Swift? We are over here killin 'em for $1350 with Swift standard
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Old 04-20-2018, 09:03 PM   #15
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Right...I'm sure you get the same information we do from competing vendor websites and the Google

Last edited by BoostinChick; 04-20-2018 at 09:15 PM.
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Old 04-24-2018, 08:34 PM   #16
Mike_Feal
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To be honest I haven't looked into it but became curious when you brought it up. I've heard rumors that a few companies have changed up their pricing scales and I think Odi might be doing the same here pretty soon.
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Old 04-25-2018, 11:03 PM   #17
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Hi guys. I havenít purchased yet but honestly. I Should be doing so soon.

I was strongly leaning ast until I read the review further up. Itís hard to justify that extra cost and I wish I could get more insight fro. People whom have had them on their cars for prolonged periods.

Honestly, Iím still very undecided and I need to choose soon cause Iím on original stock shocks with 100k+ miles that are getting a bit ďbumpy.Ē
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Old 04-25-2018, 11:34 PM   #18
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Quote:
Originally Posted by Mike_Feal View Post
To be honest I haven't looked into it but became curious when you brought it up. I've heard rumors that a few companies have changed up their pricing scales and I think Odi might be doing the same here pretty soon.
Im looking strongly at fealís options.

Im in FL. Car would only see road and track. Prob never loose surface, probably.

Definitely into the spherical bushings all around and the extenders for the rear.

Would Road Race be overkill for street point A to point B use and what are the pros/cons to not having an inverted setup ?

Whatís the cost of rebuild on all four corners , when the time comes ?

Thanks.
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Old 04-26-2018, 10:02 AM   #19
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Wouldn't the feal 442 be a little more of an even comparison, at least price wise?
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Old 04-26-2018, 10:27 AM   #20
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I'd like to preface my comment by saying that it is tricky when it comes to suspension because what one finds good for their comfort might be totally terrible for another, even if both parties have the same preference such as daily driver but occasional track goal.

I also have the AST 4100s that were tuned by TIC. 7 years since the insane group buy. I've had them rebuilt after 4 years/45-50K miles. Only other suspension I've had is stock.

I also would consider them a little too much for DD eventhough I loved how they handled on the street and track. While the stiffness never bothered me, it was too much for most passengers. I did have them at close to the stiffest setting.

I also had to send the rear dampers in for repair, each at separate times, due to apparent "puking" of fluid. While I didn't mind and knew the expectations with coilovers, it was a pain to have to have downtime on the vehicle while waiting on getting them fixed. Once was 2 months after the rebuild and the other was roughly last year. The problem was that a small pit developed on the shaft of each damper, right at where it rubs against the seals. I feel like the dust boots get snagged at the top near the perch which exposes the top cap area. Road grime would most definitely find it's way to that area. Maybe this is the case with all coilovers, I don't know.
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Old 04-26-2018, 12:16 PM   #21
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Quote:
Originally Posted by aldecam View Post
Im looking strongly at fealís options.

Im in FL. Car would only see road and track. Prob never loose surface, probably.

Definitely into the spherical bushings all around and the extenders for the rear.

Would Road Race be overkill for street point A to point B use and what are the pros/cons to not having an inverted setup ?

Whatís the cost of rebuild on all four corners , when the time comes ?

Thanks.
How serious are you about your track time? That's the real question. The standard 441 kit will handle light track duty just fine and is a more comfortable option than a RR kit. If the car is more dedicated to those track days then I would consider the RR kit but it doesn't sound like it will be necessary.

Pro's: NO "CLUNKING", EVER. NO GREASING. Less friction and stiction overall. No housing bushings to replace. A lot of lower end brands also do not have follow up support for their inverted shocks, i.e. no housing bushings available to buy separately and same for inserts if your chrome wears off. IMHO inverted is not necessary for a purely street driven car, but there are some on here that would say otherwise.

Con's: Inverted setups have much higher strength against sideways forces and are generally beefier. When I say sideways forces I mean coming into a rut sideways at speed or something similar, the shaft or cartridge will bend. If you ever plan on Rallycross/Stage Rally then these are not for you. Light offroading is fine.

Rebuilds are $100 per corner for Feal products.
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Old 04-26-2018, 12:25 PM   #22
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Quote:
Originally Posted by kenliu84 View Post
I've had them rebuilt after 4 years/45-50K miles.

I also had to send the rear dampers in for repair, each at separate times, due to apparent "puking" of fluid. While I didn't mind and knew the expectations with coilovers, it was a pain to have to have downtime on the vehicle while waiting on getting them fixed. Once was 2 months after the rebuild and the other was roughly last year. The problem was that a small pit developed on the shaft of each damper, right at where it rubs against the seals. I feel like the dust boots get snagged at the top near the perch which exposes the top cap area. Road grime would most definitely find it's way to that area. Maybe this is the case with all coilovers, I don't know.
So essentially the fronts have been rebuilt twice and the rears 4 times over your lifespan? I am really surprised they didn't notice the shaft wear when they were in for rebuilds. Shaft wear is totally normal and unavoidable but it's pretty noticeable, same with pitting.

Gotta keep that stock suspension guys, at least whenever possible. All coilovers need to be rebuilt at certain intervals and this way you won't be out of a car for weeks at a time.
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Old 04-26-2018, 01:32 PM   #23
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Fronts rebuilt once, and rears rebuilt a total of 2 times. Once something starts going bad now, I'm definitely going to look into a spring-strut setup. Few good options out there but it's the best route at this stage of my life.
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Old 04-26-2018, 04:17 PM   #24
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I spent the last two seasons on the Feal 460's and have been very happy with them. Sent them in this winter for a re-fresh and looking forward to using them again! My OE struts have been re-valved twice with them as well so I have no down time.
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Old 04-28-2018, 10:54 PM   #25
aldecam
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Quote:
Originally Posted by Mike_Feal View Post
How serious are you about your track time? That's the real question. The standard 441 kit will handle light track duty just fine and is a more comfortable option than a RR kit. If the car is more dedicated to those track days then I would consider the RR kit but it doesn't sound like it will be necessary.



Pro's: NO "CLUNKING", EVER. NO GREASING. Less friction and stiction overall. No housing bushings to replace. A lot of lower end brands also do not have follow up support for their inverted shocks, i.e. no housing bushings available to buy separately and same for inserts if your chrome wears off. IMHO inverted is not necessary for a purely street driven car, but there are some on here that would say otherwise.



Con's: Inverted setups have much higher strength against sideways forces and are generally beefier. When I say sideways forces I mean coming into a rut sideways at speed or something similar, the shaft or cartridge will bend. If you ever plan on Rallycross/Stage Rally then these are not for you. Light offroading is fine.



Rebuilds are $100 per corner for Feal products.


Damn, thank you for all this info.

Iím seriously considering FEAL , Iím prob waiting till after the World Cup cause Iíll be out of town. The track duty for this car will sparse. Iím happy just to have some track days again. Really just looking for great performance, durability and to enjoy the out of spirited driving.
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