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Showing results for tags 's13 understeer'.
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Made changes, didn't go any faster. Track related. Same Coilovers and tyres both times BC BR (8kg/6kg) and Federal RS-R 235s all round (4-5yrs old easily). Ran basically the exact same lap time give or take a couple tenths. Tried different lines and camber settings etc. Car has been tuned on a different ECU but max power was roughly the same (190-195rwkw) and max speed on straight is almost identical as is corner exit speed onto the straight. Old setup: Front: Whiteline swaybar, -2.5 camber from strut tops, approx 1mm toe out each side. Rear: 32R swaybar, standard diff, -1.3 camber, approx 1mm toe in each side. New setup: Front: Whiteline swaybar, cusco castor rods on 8.5deg, -3 camber from strut tops/whiteline bolts (mainly bolts as can use strut tops for more or less now), approx 1mm toe out each side. Roll centre adjusters (25mm), high misalignment tie rod ends, solid engine and box mounts. 15mm bolt on spacers to match rear increase in track from subframe swap, solid steering coupling. Rear: s14 standard swaybar, s15 diff centre and solid bushes, s14 reinforced subframe and solid mounts (angled down at the front for better squat geometry), -1.3 camber, approx 1mm TOTAL toe in each side, aligner got it wrong and gave me .5 each side. Issues: Car felt more planted in the rear and more forgiving in general, and less bounce mid corner, but still wanted to understeer. Tried different camber settings in smallish increments and 1 small damper setting with basically no change in lap time. Pic of tyres below, after 5yrs, are they just cactus and have no more grip? Front runs out of grip before the rear. Too much swaybar? too stiff coilovers? Car was a handful under heavy brakes, locking 1 or both tyres and squirming everywhere. Camber has the most impact on this. Will check ride heights to check corner weighting isn't throwing it out, any other way to stop the lock ups? Tyre pressures were about 21-22psi hot (14deg ambient temp). Pads (TRW) seemed OK (R33 brakes all round), but not a fast track and I have brake ducts on all corners. Given I'm locking up, tyres seem to be the limit? Old laps. New laps. Fastest about lap 6-7. Need to skip in a few mins to lap 3 or so to see brake lock up on main straight. There were many worse examples of this. Pic of front tyres after a day on the new setup.
