Koni rear shocks installed One of my grouses with the Polo is that the rear suspension while very comfortable is a bit too soft. I always wanted to sort this out on my GT. With this in mind I placed an order for a pair of Koni yellows on carpowergrid.com. Well I ordered yellows but when the order arrived I found that they were a pair of Koni Specials instead. Carpowergrid gave me a refund as the specials are cheaper than the yellows.
The Koni part number for the shocks are 80-2815. Specials are not as aggressive as Koni yellows so I was not too disappointed that I did not get them yellows as it would be a gradual introduction to suspension changes. I was nervous that I would end up with a very hard suspension.
I will detail the installation procedure in a DIY post and will focus on the adjustments and my current experience with the shock over the past two weeks. According to the literature available online, the adjustment mechanism must be turned clockwise for firmer and counter clockwise for softer. Initial setting
I set it to one turn (360 degrees) below full firm and proceeded on a test drive. Here is where I realised that the advice to tune the suspension on bumps/bumpy roads and low speeds was spot on. On well paved and level grounds the car was flat and poised. However on bumpy B roads it was what I term "jiggly pop". You hit a bump and it would jiggle a bit a bit then come down with a sharp rebound. Not a very comfortable setting for a daiy driver. I quickly removed the shocks and made them - unknowingly - even firmer. The dang instructions on the package were the other way round and told me clockwise for soft and anticlockwise for firm.
Predictably this made the behavior even more pronounced and the car started the "jiggly-pop" behavior for every small depression or bumps even on good roads. But at the same time I did appreciate the firmness of the suspension. There was little of the rear end weight transfer on acceleration and braking. So much so, I tried it out for a week. But it's a difficult setting to live with on a daiy basis and you find yourself babying it on bumpy roads. Current Setting
Over the weekend I removed the shocks and readjusted them. The current setting is 1.5 turns (360 + 180 degress) below full firm and the bumpiness has been completely dialed out. The suspension seems firmer than the stock at the same time delivering as ride that is comfortable. However only a week will give me a full picture of how it really is as I take it through the rigours of a daiy drive. I think I may be able to get away with a quarter turn (90 degrees) towards firm as well. But thats for another day. Observations
Compared to the OEM shocks the Koni shocks are a bit heavier and a couple of milimetres larger in diameter.
The OEM bump rubber seems to be made of some mattress foam like material and the lower end has started disintegrating as seen in the shot below. Will have to get a repacement for this. Same condition on both sides. Perhaps I should try for those polyurethane ones.
The inner tube OEM shock when compressed and left starts pushing out immediately while the inner tube of the Koni shock does not. It has to be pulled out to extend.
Looking forward to one complaint sorted out.
Drive on,
Shibu.
Last edited by shibujp : 31st July 2016 at 10:03.
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