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Forget main spring length, it's got nothing to do with this and therefore won't solve your problem.
Given that you have ruled out all of the other options (higher ride height, BC-style damper with separate height adjustment, softer main spring) the only way to solve this is a helper spring with...
Did you ever work out if 20 or 35 was lb/inch or N/mm?
35 N/mm is genuinely about the right ballpark for a non-sport main spring lol.
If 35 is N/mm and the helper has say 70mm travel then that’s 35*70/9.81=250kg (of sprung mass) to compress the helper fully. So basically as soon as you get any...
Metric helper springs are really difficult to find. You might have more luck searching for a "tender spring" instead. In theory they have two completely different purposes but between brands there's no consistency on what rates/lengths helpers finish and tenders start.
If I were you I'd also...
Just noticed you said B16 (PMS?) not B14.
I’m guessing they have pretty serious spring rates which, with a relatively low sprung mass, would mean very little precompression of the main spring when the car is on the ground. In this case the reduced total spring rate in rebound that I’m banging...
Assuming you’re ruling out just raising the ride height a bit, a helper spring with a longer free length is 100% the “correct” answer as this is exactly what they are designed for.
Longer helpers won’t loose you any rebound travel. You’ll need to lower the spring seat a bit to maintain your...
Download MSI afterburner, absolutely invaluable for this sort of stuff. Log CPU & GPU temps/utilisation/clock frequency/memory usage, FPS, GPU power/voltage limit. First check for obvious albeit unlikely issues (temps, VRAM leak) then make sure that the 1% lows don't correspond with the GPU core...
Yes, all cars need/have spacers.
Sometimes they stick to the back of the disc when it's removed, so it's all too common/easy to accidentally throw them out with the old discs.
You can buy reproduction spacers from KAM Racing, for example.
Can’t remember what it’s for on the standard car, but somewhere in the passenger footwell, up high towards the base of the windscreen and outboard there’s an open grommet that is traditionally used for aftermarket amps.
However, battery in boot, bulkhead adapter, or walking everywhere are all...