Ok - so it's been a couple of months since I last updated this blog, and although I have spent most of that time focussing on my GT-R - mainly due to it now being a "
Speedhunters Project Car" - I HAVE been working on the Lexus as well. For example, these "dampers."
As I had had these installed on my GT-R, I know that they work, despite the loads of skepticism I've seen often on the forums - mostly if not all by people who haven't had these installed on their cars.
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http://www.trdparts.jp/english/lexus/isf_ccsp.html |
Made by Yamaha, when I fitted the Nismo versions on my GT-R,
I immediately noticed a difference -the entire car seemed to ride smoother and handling felt a bit sharper. But basically, all those micro vibrations (which I hadn't noticed before) were now absorbed by the dampers, making the entire ride seem smoother.
So while I knew that these work, I wasn't quite sure how they would on the Lexus, as it already has a relatively smooth ride. In fact, the reason I ended up installing these, instead of the retrofit of the 2013 ISF shock absorbers (made by Sachs, vs the Tokicos the earlier cars have), was due to the advice by Ishikawa-san at the local Lexus dealer - the TRD parts have a 1 year warranty while installing the Sachs would invalidate the warranty my car currently has (at least with respect to the shock absorbers). Whatever!
On the dedicated
TRD website for the ISF, they claim:
Rigidity is improved by coupling the left and right sides of the body to achieve a flat and high-quality ride. In addition to firming up the body, these dampers increase the feeling of the wheels on the ground to ensure the chassis performance that enables steering to react linearly.
Here is what TRD claims (from
http://lexusboutique.net) for the next generation IS cars:
Borrowed from TRD engineering the performance damper further improve the drivability of your 3IS. The Performance Damper is a chassis damping component that is set in the structural areas of both the front and rear of vehicles. It is a device that controls and absorbs minute distortions and vibrations. Mounted on the front and back of the vehicle, it rapidly absorbs the slight jolts and vibrations that road surfaces present. With this application, car body movements as a result of steering maneuvers are countered quickly, providing increased driving stability as well as a decrease in road noise.
In any case, I figured that I'd eventually install these TRD dampers at some point anyway, so might as well do it now, in the hopes that the ride quality would improve.
So when the car was getting the new front bumper cover installed, I had them also install these TRD dampers (installation requires removal of the front bumper cover anyway!).
My impressions - at low speeds, the car seems, for some reason, eerily more quiet. Was there some kind of low frequency vibration before? Not sure but for some reason the car is bank vault quiet.
Then at higher speeds yes the ride is marginally improved - maybe a subjective 10-15% better, but still not at the all around level of feel that the GSF had with its Sachs dampers.
In other words, I may still have to upgrade to the OEM Sachs at some point.
The biggest difference however was that indeed, the steering felt more direct and precise, with less on center numbness (the area of numbness seems reduced). However, after getting the
Ohlins DFVs on my GT-R rebuilt, and experiencing how good those coilovers are, I now realize how much refinement is lacking in the IS-F.... what to do...