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  1. sierra4000

    asymmetry of the wheel alignment problems

    Thank You, I'm will trying to be more specific, toe setting recommendation is +1mm per left wheel, +1mm per right wheel (+2mm total) If is +2mm left and 0mm right wheel I know about steering wheel position change, but exist difference in tire wear and car stability?
  2. sierra4000

    asymmetry of the wheel alignment problems

    Hello , How way the asymmetry of the toe alignment (thrust angle) affects tire wear and car stability? Thank you Radek
  3. sierra4000

    Porsche 718 Cayman GTS bumpsteer on a factory SPASM setup problem..any idea where to look ?

    I noticed something similar with a series of offroad vehicles with oversized wheels (low ET big width,big diameter,big unsprung) Radek
  4. sierra4000

    Porsche 718 Cayman GTS bumpsteer on a factory SPASM setup problem..any idea where to look ?

    I usually find an asymmetric bumpsteer on steering rack inclination, different KPI or with different caster. Radek
  5. sierra4000

    Porsche 718 Cayman GTS bumpsteer on a factory SPASM setup problem..any idea where to look ?

    According by wikipedia, Taycan have different weight distribution, can be reason? Interesting asymmetric values,but is really under 2Dg/m difference too much? I love real cars K&C data !!! it would also be interesting to know the compliance data of both cars Some workshops measure damping on...
  6. sierra4000

    Porsche 718 Cayman GTS bumpsteer on a factory SPASM setup problem..any idea where to look ?

    Go to damping test , of course your problem also can comes from rear axle
  7. sierra4000

    Porsche 718 Cayman GTS bumpsteer on a factory SPASM setup problem..any idea where to look ?

    Are very similar bumpsteer values for both cars, after alignment your problem still remains? then it really seems that "only" damping problem when different damping from left to right creates different instant ride height this mean different toe angle for opposite wheels or also different...
  8. sierra4000

    Porsche 718 Cayman GTS bumpsteer on a factory SPASM setup problem..any idea where to look ?

    Bumpsteer appears to be symmetrical, I would lean towards Cibachrome for some asymmetry in the system I assume that the car was not crashed and that there are no idiots in the workshop to use different parts for the two opposite sides the only thing that is not visually apparent could be little...
  9. sierra4000

    Slick tire behavior

    Hello all, What is racing tire vertical load dependency (spring rate sensitivity) on wheel instant inclination angle? During cornering (body roll) Exist difference between radial and crossply tires? Exist generally difference between radial and crossply tires load dependency behavior? Thank...
  10. sierra4000

    Effects of gas pressure on automotive dampers

    Yes, but during cornering friction increase again, exist some study McPherson friction during cornering?
  11. sierra4000

    Effects of gas pressure on automotive dampers

    Thanks, I am limited with McPherson [bigglasses]
  12. sierra4000

    Effects of gas pressure on automotive dampers

    OK, thanks seal friction depends on: a)seal construction b)piston rod diameter (friction area) ?
  13. sierra4000

    Effects of gas pressure on automotive dampers

    So why is ride much harder when more pressure is use? Is ONLY due to extra seal friction?
  14. sierra4000

    V8 LS1 flywheel racing weight

    Thank you gentlemen! I will try to summarize a new original OEM balancer will be good for my RPM range, for flywheel+clutch inertia is important required car driveability and idle
  15. sierra4000

    V8 LS1 flywheel racing weight

    OK, Thanks ATI seems like good idea, but tell me please, what hapen there, why is need balancer? i want understand this car go only short runs under full load.........is european hill climb racing.............one run lenght between 2-10 km
  16. sierra4000

    V8 LS1 flywheel racing weight

    For clarification: LS1 V8 engine OEM crankshaft,OEM conrods,OEM pistons...........RPM max around 6800 with lightened pulley, flywheel,clutch can easy improve engine (car) acceleration abilities driveability on slow speeds is secondary,important is road course laptime gain i worries about...
  17. sierra4000

    V8 LS1 flywheel racing weight

    OK, Because we still use OEM internals, we expect RPM range up to 6800 so OEM harmonic balancer could be more or less good for our application. With flywheel in the past experience always had acceleration gains with minimize inertia(Our V6 flywheel is 3,5 kg only) and again with low inertia...
  18. sierra4000

    V8 LS1 flywheel racing weight

    Hello, exist recommendation for minimum flywheel weight? how way is harmony ballancer improtant? we build racing engine and try minimize engine inertia thank for all comments, Radek
  19. sierra4000

    Negative Caster Question

    Check the steering system friction, extremely tightened the steering gear create strong wandering feel.
  20. sierra4000

    Tire lateral properties

    Good notice, indicator is better hold strictly horizontally to exclude mistake

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