Ohlins Shock Length - SCCA Street - LotusTalk - The Lotus Cars Community

 
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post #1 of 5 (permalink) Old 03-14-2017, 01:45 PM Thread Starter
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Ohlins Shock Length - SCCA Street

I am trying to piece together a reasonably affordable aftermarket shock that is street class compliant, but no luck.

Extended length of the OEM shocks are ~14" front/16.5" rear.

The currently available Ohlins sets, LOV1/D-- are ~14.5"f/15"r. The LOV1/F-- are even shorter. Neither of these shock pass the (+/-) 1" allowance.

Going off pictures, the Lotus Sport Ohlins have really long shaft extensions, which would make it difficult to get the spring located correctly.

For those running these shocks and managed to make them compliant, what model are you using?
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post #2 of 5 (permalink) Old 03-20-2017, 12:58 PM
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Doesn't the Blackwatch Racing kit make Ohlins compliant?

https://www.blackwatchracing.com/Ohl...ter-p/1035.htm
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post #3 of 5 (permalink) Old 03-20-2017, 05:01 PM Thread Starter
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Quote:
Originally Posted by Alphadawg View Post
Doesn't the Blackwatch Racing kit make Ohlins compliant?

https://www.blackwatchracing.com/Ohl...ter-p/1035.htm
Yes, I and had hoped to purchase them, but they only relocate the spring so it is in the same location relative to the hub. This takes care of #3 of the shock rule (below).

There is another requisite that the length of the extended shock is within 1" of the standard part, #4. None of the currently available Ohlins shocks meet that rule as they are too short in the rear. This isn't unique to Ohlins, most of the aftermarket shocks are shorter than the standard shock by quite a bit. That is fine with stiff springs, lower ride height, if you have a clutch diff, or don't autocross. But losing droop can be potentially problematic for a stock car if you get any wheel lift.

From the rulebook:
3. Adjustable spring perches are allowed, but the spring loadbearing surface
must be in the same location relative to the hub as on the standard
part. Shims may be used to achieve compliance.
4. The fully extended length must be within 1” (25.4 mm) of the dimension
of the standard part.

Last edited by JRTritsch; 03-20-2017 at 05:09 PM.
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post #4 of 5 (permalink) Old 03-20-2017, 05:50 PM
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Try contacting Performance Shock, Inc in Sonoma, CA.
They're authorized Ohlins(and many others) service center, they have made upgrade kit specifically for your damper(and others), and are very familiar with Lotus.

This is for different damper body, but I'm thinking something like this can work. Nitron dampers can have different damper body lengths this way as somewhat related note.
Ohlins TTX36 Motorsport Racing Damper Body End Eyes [TTX 36] : Performance Shock, Inc

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post #5 of 5 (permalink) Old 03-20-2017, 06:24 PM Thread Starter
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Yes they can modify the Ohlins to meet the requirement by changing out the shock body. I'm looking into that option now. It looks like nitrons can be ordered to the correct length too. With either option I'll probably be stuck machining custom spring adapters similar to the Blackwatch adapters, because its is unlikely the dimensions will fully match. Certainly not an impossible task, but easy to waste a bunch of time and maybe money re-engineering a solution. That's why I'm curious to see what model of Ohlins have been used in the past. Perhaps Ohlins can just rebuild of that spec.

I'm not keen on spending a ton of coin developing a shock on a car that is at present not particularly well classed.
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