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InterestsMotorsport and Red Wine (consumption). I have been testing the theory for the past 30 years that red wine consumption occurs in three differeing quantities: social, therapeutic and industrial strength ..... but have yet to draw any conslusions, other than "I like red wine".
My Z34 regularly tops out at 225-240 at PI on entry to T1 (5th not 6th) If it hits a wall then the engine is not breathing. The OEM headers are pretty good so a flat panel filter and CATS would be the first place to look for an engine which is being strangled, If they are OK, lok at air metering (AFM) Has the car received regular maintenance ?? Any maintenance been skipped that might affect the engines ability to breath OR cause increased drag (wheel bearings, brake drag etc)
I have seen Recaro's in a Z34 but they are expensive as they come with an airbag - around $3.5K plus fitting. If you fit a non-airbag equipped seat and drive on the road, you are at risk of a defect notice from Mr Plod.
Stillen shorties with HFC is one alternative. also Z1 MotorSport shorties plus HFC There is no doubt that Long Tube headers perform better but they lack cats and that can cost you a lot of money if caught by officialdom. If a pure race car, then yes, they are the ultimate. If you want bragging rights for the most expensive headers (remember, you still need the rest of the system) then be my guest .... but I would not pay $6-8K for headers and the rest of the exhaust system.
OP, you are playing with fire here ............ If you clearly have no idea about suspension and are intent on tracking it when an incorrectly set up suspension an cause significant car damage and or injury to the driver. Changing the front roll centre without changing the rear roll centre will affect the way the car rolls under lateral load and that cause cause snap over-steer which most track-day newbies simply cannot cope with - usually you spin into the fence and damage the car. Forums ARE NOT in the main a source of reliable information - yes, you can find gems but in the main what you get is personal assertion dressed up as incontrovertible fact. If you do not possess the knowledge, consult a suspension specialist to arrive at a setup that suits you. Starting with cr4p purchased off the web that is not well researched is about the worst place to start - all you will do is risk turning your car into a pig. The NISMO 370Z race cars in the US Grand Am series did not need to relocate suspension pickups and they were plenty fast. I've been tracking my Z34 since 2009 on standard pickup points (replacement FUCA for negative camber only) and am comfortably close to 1m50s at PI and mid 20's at Sandown. Can I ask what you feel in the car now that requires a lowered roll centre ??