The rear tires were showing even heavier wear of the shoulders.
Looking very closely at the tires, you can see the rear tire is rolling over a bit more on the shoulder than the front tire. This was not unexpected as these tires have more grip than the stock tires. For now, I’ll increase the negative camber a bit. I think this tire setup is a bit too much for the springs of the factory SPASM setup. Maybe I will have to go to a stiffer spring rate.
David’s dad, who I think is 76 years old, did a session behind the wheel too. He actually got the highest lateral G reading between the three of us, tagging 1.45G going through the corner Off-Ramp.
David has the S2000 and his dad drives the Z. Both found my car easy to get up to speed in quickly. Oh yeah, I found a use for the Individual setting of the Sport Chrono dial and that’s having the rear spoiler up all the time as my track mode. Before I installed the DSC controller, Individual mode was sport plus, but soft suspension. With the DSC controller, the Sport Chrono knob no longer controls the suspension setting, so I didn’t have a use for Individual mode on the street anymore.
At Buttonwillow on the Classic track, you have to use the curbs to go fast. The spherical bearing everything setup from E-Motion Engineering contributed to the car being very stable over the curbs.
The grills from the Radiator Grill Store collected lots of rubber over the two back-to-back track days.
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Looking at stuff, I would say you need more roll stiffness, more negative camber, and less front caster.
I got shims from E-Motion to adjust the caster and camber. I just need to find time to adjust the alignment before my next track day. For more roll stiffness… I’ve been thinking about it for a while already. Commonly used is the Tractive setup, but Nitron released their new setup compatible with PASM/DSC. Looking at spring rates in the GT4 territory to keep that balance of streetability.
Can you please expand on the less front caster comment as it pertains to the 718 chassis? Is there a reason you suggest he might have too much and what would be a good target caster for a mixed use street/track 718?
It seems that it is common to end with 9 or 9.5 degrees caster on these cars.
Has anyone gotten these plugs yet? Seem like a decent upgrade.
Ruthenium HX is available in two designs to best maximize the performance of your engine.
DFE (double fine electrode) maximizes ignitability, while reducing emissions for low-heat engines. This NGK-patented design is recommended for non-turbo applications.
PSPE® (projected square platinum electrode) provides the best ignitability and service life for high-heat engines. This NGK-patented design is recommended for turbo and supercharged engines.
https://ngksparkplugs.com/en/products/ignition-parts/spark-plugs/ruthenium-spark-plugs
Interesting. I haven’t kept tabs on spark plug tech. The boring part of sticking with OEM plugs is that they are pre-gapped, ha.