Quantum T5-RS Coilovers w/ 12K/10K Swift Springs
For SaleSteering/Suspension
-
Price
$2,100
- Location Hampton, VA, 23663, USA
- Condition Used
- Compatibility
| Make | Model | Year |
|---|---|---|
| Mazda | RX-7 | 1993 - 2002 |
Description:
Quantum T5-RS Coilovers - $2100 + shipping
If you don't know, Quantum is one of the premier brands of coilovers out there. They are a supplier for many racing series such as F1, F3, DTM, JGTC, etc. If you want a testament to their performance, know that Quantum is the go-to brand of RE Amemiya. Not to mention, many of the other Super GT cars also run Quantum coilovers.
These are are all freshly rebuilt. That means all new o-rings, seals, bearing sleeves, re-chromed shafts, and fresh Motul oil. You are essentially getting a new set of coilovers. As far as rebuilding goes, I can do them for you or it seems like ANZE Suspension is probably a good place to go to as well. These come with 60mm ID Swift springs. The fronts are lightly used 12K and the rears are brand new 10K. I also included brand new Cusco upper spring perches so the top hats are fully floating. This reduces friction and bending loads as the shock compresses and thus improves reliability and minimizes hysteresis. Upper spring perches are not something you get from most coilovers--even the Ohlin DFVs lack them. These coilovers are also incredibly light. I haven't specifically measured this set, but a previous set in nearly the exact same configuration were 6.7 lbs and 7.8 lbs for the front and rear assemblies with springs.
From Quantum:
Are these more of a track oriented setup or also ok for the street?
Damping/rebound adjustable?
Can the 10k spring be used in the front and get 8k for the rears, or 8/6 for a more street friendly setup?
Last edited by neit_jnf; Feb 10, 2021 at 02:47 PM.
So my personal opinion? I believe Quantum Racing makes a much higher quality damper for the FD3S. Quantum meticulously hand crafts each and every piece with designs rooted in racing. They don't rely on large manufacturing assembly lines and don't compromise for lower quality "street dampers" like Ohlins does. After all, Ohlins is in it for large manufacturing quantities, lower costs, and increased profit. Again - just personal opinions here. Quantum is in it to literally make the best damper they can make. Don't get me wrong though, this doesn't apply to all Ohlins dampers -- their racing series like the TTX are top notch. I've known plenty of racing teams run these bad boys. But those shocks are probably built on a smaller scale, with higher tolerance manufacturing, more hands on, and more meticulous assembly like Quantum. I don't think the basic Ohlins DFV shocks get near what you get from Quantum until you start getting custom built ones like Sakebomb makes with their FP Spec. I wish the FD community would place a higher emphasis on quality dampers and make Quantum T5's like this or Sakebomb's FP Spec's 'thee' standard.
https://www.sakebombgarage.com/fpspe...dfv-fd3s-rx-7/
As far as Ohlins "DFV" technology - yeah its a good feature to have and it certainly makes it stand out from your standard coilover. It works well for the street, but you'll have compromises in other areas for this feature. You can accomplish the same concept using other shock designs like Quantum does. Quantum uses a second piston separator plate (you could pretty much say it is a Dual Flow Valve of sorts) that enables shocks to have the quick high-speed blowoff and maintain fast rebound response like the DFV accomplishes. However, Quantum features enable it to run low nitrogen pressures which increases stability, tire contact, and response. I don't know exactly what Ohlins pressures are at, but I'd estimate 175 psi? Only guessing. Quantum spec is 125 psi and that is a great advantage.
All that to be said, the Ohlin DFV is a highly praised damper and I could never fault anyone for purchasing it. People love it, it works great, and it's a good price.
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The damper is designed to work well on both the track and street for the reasons I've stated above. The dampening specific to what spring rates you're running is the more driving factor of is it a "track" or "street" damper. A shitty Tein Flex revalved for 18K springs can be considered a "track" damper - that doesn't mean its worth a damn on the track though. There are certainly other features that might show up on a "track" damper like upper spring perches to minimize hysteresis in damper curves. Or having aluminum vs steel shock bodies because shaving a few pounds on every corner is crucial when you are measuring 0.002 seconds shaved off every lap. Or having high quality internal shims that are consistent and don't change your dampening curves after running them for 6 months (i.e. they haven't worn out from all the flexing).
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A 10K/8K setup is good and what I'd consider a very street friendly setup. I think I sold mobash a 12K/10K setup that he's been very happy about on the street and that was even a non-adjustable set. The 8K/6K is probably a little too soft and we'd probably need to start looking at revalving for the 6K damper.
