I installed the water injection setup to help with knock mitigation and reduce the intake air temperature a bit. I went with the new wheel and tire package to increase grip. The best place to determine the impacts of these changes is at the track. Before heading back out to the track, I did a spark plug change and fixed a couple issues to make my water injection setup and tire package track ready.
Heeding the advice of the team at RaggDoll Motorsports, I went with the factory plugs for the bigger 2.5L 4-cylinder engine that came in the higher-power 718 GTS from 2017-2019. You need a thin-wall, 12-point, 14mm spark plug socket with a wobble joint. You’ll want some dielectric grease to put on the plugs which make the coil packs go on easier and seal. Porsche uses some neon green snot looking dielectric grease.
To get to the front two plugs, you’ll need an array of extensions and wobble joints. There was about 8700 miles on this set of plugs over two and a half years. Porsche recommends changing the plugs every four years regardless of mileage; it seems the plugs can seize to the head if left in too long.
I used my 90-degree T30 Torx wrench to get to this one coil pack screw on the passenger side. There is a heat shield on the passenger side you have to move out of the way by bending it; the screws for the heat shield are external torx. The torque spec for the spark plugs is 23 Nm, +/- 3 Nm. With the wobble joints and extensions, it can make it a bit funky to get a proper torque. The first spark plug I did was the driver’s side front which required the long extensions and wobble joints. I ended up torquing that one by feel because I was using the torque wrench and it just kept on going; I was scared I was going to over-torque and damage the threads in the head. So, I unscrewed that plug a bit to make sure all the threads were still good and torqued by feel. The other three plugs, I was able to get a good click with the torque wrench.
If you recall, I had a leak from the plastic water reservoir that came with the Snow Performance water injection kit. I thought I had patched it up well enough. A half-gallon of water dumped into my trunk later; I found out a crack had formed further up the molding split line of the plastic reservoir. It took three days of soaking up water with towels and drying with a blow dryer to get everything dry again. Anyway, I decided to get a 1-gallon aluminum tank from Boyd Welding. I appreciated the good packaging from Boyd Welding.
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Looking at stuff, I would say you need more roll stiffness, more negative camber, and less front caster.