I'll even say it straight the GTP theory on spring rates and dampers being relative to each others slider is stolen from me. I originally explained this to Motor City Hammi and I was banned for the usual exposing ass and not kissing any now Motor City Hammi changed his tuning guide to use my theory. Fucking epic this guy talks so much shit, but ends up ripping off my ways. Love it
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This is an example of how GTP figures out tuning, a poll thread for how to tune springs has popped up in the aftermath of the thread that killed 332i. The FITT tuners have posted some formulas they use to calculate the spring rates.
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Pure Math Based Tuning
The problem is the math used is retarded. Its just nonsensical calculations whose focus is turning the weight at weight split into a value acceptable as a spring rate. overlooking the leverage factor of the suspension.... What this means is if they don't know or even attempt to factor in a leverage factor, any calculations they make even if based on real principles wont work. A leverage factor turn X into XY the problem is not knowing the leverage factor its closer to X? literally impossible to calculate a result with an incomplete calculation.
The info needed is the spring frequency. It takes the weight, weight split, sprung weight, spring rate, and suspension leverage factor with a few other details to calculate. We can actually do a lot of pre emptive tuning based solely on the springs frequency if we have the frequency or info needed to calculate it correctly. The problem is with the leverage factor missing its impossible to calculate the frequency or tune using math alone. Even if we had all the info we wanted, leverage factor and spring frequency, it will still require feeling out the car on the track.
This is why my tuning tools are assist type tools, because its literally impossible to input a bunch of car data into a tune generator and have the end result be anything other than a generic improperly tuned ass bag, no Tune Generator WILL EVER be able to put out a refined set up like one that's been felt out and tuned on the Track period.
Real World Aftermarket Specs Used in GT6
The problem with using real world performance parts specs is the cars do not use real spring rates relative to the cars in real life. For example any spring rate you find on the spec sheet for any given car in real life will not math the in game stock spring rates. (I have a theory as to WHY, but that's not important ATM) If an aftermarket company provides a spring 20% stiffer than stock, the in game 20% increase will not land at the same rate as in real life. Using the posted spring rates will have varied results. Some cars it will somewhat work, but most will require much accommodating tuning in other components to make seem right, IMO these are not ideal springs in the game for the most part. I have found a very few that relatively work.
Its possible (though untested) that aftermarket springs % of increase can possible yield similar result virtual to real, I will have to give that a try as it would work with my theory on why stock spring rates in the game don't match real world spring rates.
I think GT6 was reverse engineered.
To put it VERY Simple I think PD took GT5 in one hand, then KW Data, Yokohana Data and CFD aerodynamics in the other and smashed its hands together. KW data being sourced on the 7 post rig is highly spring frequency based & so the frequency became the main data vs the springs on the opposite side of the equation. I believe to accommodate/incorporate the KW data into the GT physics engine the spring rate and leverage factors were manipulated to achieve the desired frequency.