Being a pessimist, how many K's has the car done? From memory the GTi was 10/15 mm lower than the TSi and common spring settling is around 3 to 5 mm in the first 5,000 k's then 1 mm or so for each 10,000 k's after that, depending on load of course. That happens up to around 60,000 k's at which time the original shocks are commonly past it and can no longer control the spring oscillations. This commonly results in spring fatigue which can often accelerate the settling. So, if you put, say, a new pair of GTi springs in a TSi that has done say 60,000 k's then it is quite likely that they won't lower it much at all. Plus of course the shocks will be past it, keeping in mind that they weren't valved for the slightly higher GTi spring rates in the first place. Of course the higher spring rates will accelerate the shocks' deterioration.
Again from memory the GTi springs only have about a 10% increase in their rate, so I'm not even sure that, ignoring the above, it's even worth the effort to swap them if improving the handling is a consideration. I'd be far more likely to recommend a rear swaybar, that would make far more of a difference.
Having swapped wheels & tyres from a TSi to a GTi Golf I can answer the second question with a most likely yes, the lower profile tyres make more difference to the ride comfort than the slight difference in spring rates.
Cheers
Gary
Last edited by Sydneykid; 15-09-2016 at 11:47 AM.
Golf Mk7.5 R, Volvo S60 Polestar, Skyline R32GTST
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