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HS Bilstein / Öhlins Shocks

HethelSport 190308-01 HSDampersSA  webcover

for Evora • S • 4xx-Series • Evora GT cars

We are first going to acknowledge that the Lotus Evora is a wonderful car with phenomenal handling. That being said, we’re going to make a great car better.

Our system begins with the factory damper bodies but unlike other aftermarket alternatives, our solutions retain the original upper spring mounts, exactly as the Lotus engineers intended. We then gut the damper and rebuild it with the best internal hardware available. Our shocks can be ordered with either HethelSport’s proprietary fixed valving or an externally adjustable valve centered around our same proprietary valve specs.

The Challenge: We all know the Evora has great street manners, approaches it's handling limits with grace, and as a double duty street/track car, can tackle most road courses well. But there are flaws. Most annoyingly, in complex curves and transitions, the body will porpoise–meaning that the weight transfer will load one end or one side of the car during compression, and as it unloads, will add an overwhelming amount of energy to the rebound causing the car to "pogo" or load-up much more than ideal. This happens with side-to-side weight transfers but also equally important, in front-&-rear weight transfers such as throttle steering, left-foot braking, or brake modulation. This is less noticeable with constant radius, single apex turns found at “point-&-shoot” road courses like Laguna Seca but at complex, “rhythm” courses such as Sonoma Raceway, these transistions become a liability at 8/10ths driving and beyond. We have traced this characteristic, not to the valve settings or even the spring rate, but instead to the quality of the internal damper components and their ability to control rebound and the second & third+ oscillations.

Our two solutions:
Tier 1 | Enhanced is effectively an Öhlins damper in a Bilstein Lotus Evora shock body utilizing our proprietary custom valving and adjustable lower spring perches. 

Tier 2 | Performance takes our Tier 1 shock and adds adjustable valving through an external adjustment knob.

The Details:
Our Tier 1 | Enhanced shocks begins with a set of original Evora dampers.  The shock body gets disassembled, cleaned, inspected, and prepared. The damper is then rebuilt using an Öhlins internal piston, valve shimming, rod guides, and o-rings. The damper is then filled with Öhlins shock fluid and pressurized with the same nitrogen gas found in original Öhlins shocks.  (About Öhlins)

Our Tier 2 | Performance shocks take the Tier 1 design and shortens the damper body (the overall length of the shock remains similar to the stock originals), and adds Öhlins adjustable shafts & adjustment knobs, end eyes, adjustment needles, and bump rubbers.

Are Öhlins TTX shocks better than our HS Bilstein/Öhlins?
Read our F.A.Q. here and find out!

Both Tier 1 & 2 include adjustable lower spring perches that easily allow ride height adjustment without any shock or suspension disassembly. While these perches can be used to lower the car, the intended purpose is to corner balance the car.

Both Tier 1 & 2 dampers include HethelSport spec’d Eibach springs. The old-school philosophy of super stiff springs and a focus on the primary oscillation dampening is antiquated. Modern, sophisticated race and performance street suspensions are based on a strategy of a softer rate spring (which provides more grip, sooner) with high-quality primary and secondary damping, and that is exactly how our suspension partner has designed our solutions. The results are an impressively comfortable street ride with awesome control & predictability with high grip levels on the track.

Unlike other aftermarket Evora shocks, our dampers reuse the factory chassis spring retainer and shock mount. Other shock companies discard these and replace them with the common spring retainers they have habitually used for the past 40 years because that is what their parts department has. The weakness with this approach is that both the dampening and spring loads are all concentrated on two pinpoint spot locations of each upper mounting bracket. Our dampers utilize the factory mounts and spread the weight of the car and all the suspension loading onto the factory mounting bracket exactly as Lotus engineers originally intended.

Tier 1 or 2?  We believe Tier 1 is a fantastic upgrade to any Evora and for most people, it will be all they need. This solution provides vastly improved control, a comfortable ride, and is ready to go. For those that like to experiment, fine tune their suspension, or just want the added flexibility of an adjustable damper, Tier 2 will be the answer. Again, for most situations, we recommend Tier 1 as the best value while Tier 2 offers adjustability allowing the best track-specific performance.

Our Shocks are only available on an exchange basis and there are two ways to get them:

  1. Upon placing your order, we will ship our Tier 1 or Tier 2 dampers after receiving your used dampers, or
  2. You can leave a core-charge deposit and return your shocks after receiving our Tier 1 or Tier 2 dampers. When we receive your shocks, we will inspect them and, assuming the shocks are not damaged, we will refund the core-charge deposit in full.

In either case, your returned shocks must be in physically good condition, free of dents or damages, and in good working condition. We do not sell our shocks outright–the sale of our shocks require a set of stock Evora shocks in return.

Please note that internally, our shocks will be new but externally, there may be signs of use, weather, or aesthetic imperfections.

Our shocks are designed and rebuilt by a best-in-the-business suspension shop authorized & certified to sell and service Ohlins, Bilsteins, Penske, Koni, Moton, JRZ, Hyperco, Eibach, and more. HethelSport reached out to Öhlins in Sweden for a recommendation and the result confirmed that our suspension partner is one of the best in the country. We have been working with this partner since the beginning of 2017 and have the utmost trust and faith in their expertise and craftsmanship. This partner currently supports countless professional race teams, VSA racing Evoras, Singer Porsches, and high-performance restorers thoughout America.

We have tuned these shocks with Tony Colicchio of TC Design. Tony is a championship race car builder & driver, winning his class at the prestigious 2017 25 Hours of Thunderhill and is the 2016 NASA Western States ST3 Champion. Tony has been a trusted friend of us for nearly 20 years, working on both our Exige S and now, our Evora.

HS Bilstein / Öhlins Shocks, Exchange only

• Prior to ordering, please read About Us for detailed purchasing & shipping terms;
• Where indicated, reservation months are estimates only (although we try our best);
Shipping charges are for continental U.S. destinations only;
For International shipping & all other destinations, please email prior to ordering;
• Combined orders may qualify for reduced shipping; requests must be made prior to ordering;
• Refunds for orders canceled by customer may be subject to a 3% fee (4% for international).

• If Factory Bilstein Shocks Core Deposit (below) is not incldued, shocks will be sent out after
receiving 2 front & 2 rear factory orignal shocks in physically good condition, free of dents or
damages, and in good working condition; springs are not required.

Cancer and Reproductive Harm - www.p65warnings.ca.gov
Factory Bilstein Shocks Core Deposit

• Prior to ordering, please read About Us for purchasing & shipping terms;
• Applicable to the Tier 1 | Enhanced or Tier 2 | Performance HS Bilstein / Öhlins Shocks only;
• Cores shall include 2 front & 2 rear factory orignal shocks–; Cores must be in physically good
condition, free of dents or damages, and in good working condition; springs are not required;
• Return shipping & insurance shall be paid by and the responcibility of the customer;
• Cores shall be received by HethelSport within 31 days of delivery of Bilstein / Öhlins Shocks;
• Refund for cores received after 31 days may be pro-rated at the descretion of Hethelsport;
• Refund for cores wth damage shall be at the descretion of Hethelsport.

Cancer and Reproductive Harm - www.p65warnings.ca.gov

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