Strut travel: This is only an issue at the fronts. Front spring weights are typically softer for the SW20 for balance but I have ran anywhere from 250lb/in to 150lb/in. I go even softer as car weight decreases. Spring rates: Rear, I recommend 200lb/in as a good starting point for a 2500 pound car. The lack of front travel, excessive spring rates and stiff damping (even on the lowest settings) only aggravate the issue. I will say that aftermarket coilovers tend to be a step backwards in the traction department. Without throwing a power number or time slip at the issue. This is because the SW20 suspension has very low antisquat values and relies on weight transfer to get "on the back tire" and stay there. The factory suspension can work surprisingly well with its soft spring rates and typically worn dampers. Struts and Springs: There is so much to be unpacked here and times when one combo will work and when it won't. The minimum amount of coasting felt between a clutched shift is enough to feel like the car is rear steering. The rear weight heavy nature of the MR2 makes for a very uneasy feeling at anything less than "loaded" or acceleration conditions. Notes on slicks: I would not even suggest you attempt full slicks on an SW20 unless your goal was a record time for your combination. That being said, any of these tires can be overpowered and only you and your tuner can determine how much power you can apply at any point on the track. This is true of slicks as well but happens at a higher amount of shock as the soft side wall construction really soaks up a brutal amount of drivetrain shock. A drag radial will take more effort to make work as they are less tolerant of sudden application of power. If you are reading this and serious about straight line acceleration, I will already assume you have an all motor car with a 225 width or better drag radial, or a boosted car with a minimum 275/50 Drag radial or 26-10 slick. Tires: What better place to start than here. I personally have 1.4 goals when I get back to the track with my all motor build. All motor MR2s are seeing 1.5s on just weight reduction and manual clutch slipping. We have seen consistent 60 foot times in the 1.2s on boosted cars with the wizardry of modern electronics like what Fuel Tech brings to the table. The last couple of years has brought about the quickest and fastest MR2s in history whether all-motor or Turbo. This is, however, a path in the right direction and use this info as you will. This info is not written in stone and there are a myriad of combinations and, as yet, untested means to improve results. I want to first preface the information you see below.
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