LTS Damper Dynos - LotusTalk - The Lotus Cars Community
 
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post #1 of 13 (permalink) Old 05-25-2015, 08:54 PM Thread Starter
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LTS Damper Dynos

Sine wave input
1.5" stroke

LTS front damper


LTS rear damper

2006 Lotus Elise
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post #2 of 13 (permalink) Old 05-26-2015, 06:00 AM
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Cool! Those are pretty heavily valved. May explain why they don't feel that great for daily driving.
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post #3 of 13 (permalink) Old 05-26-2015, 07:00 PM
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How many inches per second is the valve/piston moving during, say, a slalom? I've never had a feel for that.

Sharp bump, probably pretty quickly. Big input? Any ideas?


Iain
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post #4 of 13 (permalink) Old 05-26-2015, 07:17 PM
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I would try to put more of a "Nose" on the shock and try more of a digressive rate for the rest. This should give you better control for Auto-X and not make the street ride so harsh. Also, most velocities that you are going to be interested in tuning is in the 1-2 in/sec range. Anything above that are bumps in the road.

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post #5 of 13 (permalink) Old 05-26-2015, 08:47 PM Thread Starter
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Agreed - they could use a lot of tweaking to make them useful for auto-x. BWR has me covered, as far as shocks go.

Maybe I should have explained better... the plots are just for reference. I wanted some surrogate shocks to test my dyno setup before dynoing a set of LOV Ohlins. If my setup was configured incorrectly, I'd rather break a set of my Bilsteins than someone else's Ohlins.
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post #6 of 13 (permalink) Old 05-27-2015, 12:21 PM Thread Starter
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Quote:
Originally Posted by mannix View Post
How many inches per second is the valve/piston moving during, say, a slalom? I've never had a feel for that.

Sharp bump, probably pretty quickly. Big input? Any ideas?


Iain
Iain, I haven't collected data... so, everything I've read is second hand (at best). Dennis Grant has some data for 3 auto-x sites. He doesn't break it down into slaloms, sweepers or other features.

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post #7 of 13 (permalink) Old 05-27-2015, 01:02 PM
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So what kind of set up do you have that you're able to dyno your own shocks? That's pretty cool.
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post #8 of 13 (permalink) Old 05-27-2015, 01:05 PM
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Thanks, will check DG's stuff out. Dyno graphs are neat, but I guess it depends on what one is after, and do I care about 9"/sec? Does it ever move that fast, outside the context of the Fast and the Furious?

I just don't know. Seems to me that 2-4"/sec is the important range, but that's sheer speculation.


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post #9 of 13 (permalink) Old 05-27-2015, 02:18 PM Thread Starter
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Originally Posted by glagola1 View Post
So what kind of set up do you have that you're able to dyno your own shocks?
6" stroke servo hydraulic actuator, MTS controller, 1000 lb strain gage load cell, 6" stroke LVDT, home-grown data acquisition system, MATLAB (or octave) for data processing.

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post #10 of 13 (permalink) Old 05-27-2015, 09:11 PM Thread Starter
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More shock dyno plots in the following thread in the Suspension subforum.

https://www.lotustalk.com/forums/f91/...9/#post4099577

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post #11 of 13 (permalink) Old 05-27-2015, 11:23 PM
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I take it this is s LSS Bilstein non-adjustable 'sport' dampers, not the Bilstien single adjustable 'track pack' dampers?

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post #12 of 13 (permalink) Old 05-28-2015, 04:51 AM
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Quote:
Originally Posted by forkmeupscotty View Post
I take it this is s LSS Bilstein non-adjustable 'sport' dampers, not the Bilstien single adjustable 'track pack' dampers?
Correct. I think Jake used LTS because the factory manual calls the track pack the Super Sport suspension.

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post #13 of 13 (permalink) Old 05-28-2015, 07:02 AM Thread Starter
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Quote:
Originally Posted by forkmeupscotty View Post
I take it this is s LSS Bilstein non-adjustable 'sport' dampers, not the Bilstien single adjustable 'track pack' dampers?
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Originally Posted by ABQautoxer View Post
Correct. I think Jake used LTS because the factory manual calls the track pack the Super Sport suspension.
Actually, these are the base dampers that come with cars that have the 5.5" wide front wheels.

As Tom mentioned, the wording in the Lotus service documentation is a bit contradictory to the nomenclature used on LT.

For this discussion:
LTS = base, 5.5" wheels
LSS = sport, 6.5" wheels
Track = track pack, single-adjustable Bilsteins

I'll likely have a set of LSS dampers to test this summer. My car was a base model, hence the LTS damper plots.

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