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John Coffey

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Everything posted by John Coffey

  1. John Coffey
    The shocks don't hold the car up, the springs do. If one corner is lower then the others check to make sure the spring is properly seated and that you have the correct springs on each corner of the car.
  2. John Coffey
    3:54 R180s were stock in an automatic 240Z. Maybe the PO converted an automatic car to a manual. Doesn't really matter. You have what you have and it will be far more important from a performance standpoint to install a LSD then to try and source a 4:11 ring and pinion.
  3. John Coffey
    I've heard of 4 pinion/spider gear open differentials in the "K" R180s but I've never seen one. I assume it would have to be in a heavier duty non-sporting application then a S30 or the front of a 4x4 pickup (some Japanese market sedan?). The Nissan Comp diffs were all 4 pinion/spider. Nissan had an OEM CLSD that was installed in the R180 and R190 that had two pinion/spider gears. For the R190 it was referred to as a R192 and I've had two of those with a 3.90 gear. Parts for this unit are very hard to find.
  4. John Coffey
    A couple issues: 1. Unless you're a registered racer with Nissan you cannot order directly from Nissan Motorsports. You'll have to order the parts through a cooperative dealer. 2. New R180 ring and pinions have been NLA for at least 5 years. Maybe Nissan Motorsports has sourced a new stash of parts or is sourcing new from Hitachi/Subaru, but I doubt it. 3. You best source for a 3.90 R180 is from a 2004-2006 Subaru STi - plus you get a CLSD.
  5. John Coffey
    I suggest you contact Greg at Motorsports Auto in Orange, CA and ask him what NLA parts he gets the most calls for. MSA has by far the largest channel for Z related parts so supplying them would be critical to your business success.
  6. John Coffey
    Don't run the engine with the foil inside it. Its still a piece of metal no matter how thin it is. Take off the throttle body and put the shop vac on the intake manifold opening. Be sire to empty the shop vac before doing this so you can verify that you got the piece out of the engine.
  7. John Coffey
    If there is no performance benefit, how would increased tuneability help? And given that you can modify the SU needles and use an assortment of jets and damper springs to tune SUs any way you want, I argue that the difference in tunability is much less then you think.
  8. John Coffey
    The front springs are progressive and have a "working rate" of 140 lb. in. The range is from 90 lb.in. to 150 lb. in. Most people do not like that front spring because a lot of dump travel is lost.
  9. John Coffey
    Read through this thread with special emphasis on the cooling system bypasses. http://forums.hybridz.org/topic/59029-head-cooling-on-cylinder-5-solutions/
  10. John Coffey
    Great videos! Thanks!
  11. John Coffey
    I've never put stock springs on a Z suspension. Not that I don't like them, but my forte' is improving the handling of these cars. I can get the springs off in about one minute with a plasma cutter and an impact gun - unless the old shock shaft boot catches on fire... :-)
  12. John Coffey
    Removed springs quickly and easily.
  13. John Coffey
    This one: http://www.northerntool.com/shop/tools/product_200579824_200579824
  14. John Coffey
    I spray the inside of the strut tube with WD40, Kroil, Wurth HKS, or whatever I have and then wipe the shock body with grease. Mostly to make it really easy for the next guy to get the shock out. I'm a giver... :-) 'Course, if I'm in a bad mood, I fill the strut tube with 4 ounces of JB Weld and then stick the shock in... :-)
  15. John Coffey
    A prime example of Engineering Masturbation. :-)
  16. John Coffey
    I've had a couple N42 heads that were cast without the injector reliefs and were drilled only for carb manifolds. Don't know what Nissan application there were used on but both came on N42 blocks.
  17. John Coffey
    Power is generated during the combustion process.. That power is used to accelerate mass (pistons, rods, crank, flywheel, valve train, clutch, transmission, driveshaft, differential, axles, wheels, tires...) Reducing the mass and/or MOI in everything that is being acted upon by the combustion process increases the rate of acceleration. The measuring system (inertia dyno) directly measures rate of acceleration of ALL the mass being acted upon by the combustion process and uses a formula to calculate an artificial number called "horsepower." Reducing the mass anywhere in the range of measurement increases the rate of acceleration but has no effect on power produced in the combustion process. It does affect a proprietary calculation provided by inertia dyno manufacturers that generates an artificial number called "horsepower."
  18. John Coffey
    Supply and demand. Triumph made about 91,000 TR6s from 1969 to 1976. Nissan Made about 168,000 240Zs and about 220,000 260Z, 280Zs.
  19. John Coffey
    Ask to see the engine build documentation and receipts for oil changes, etc.
  20. John Coffey
    Send Dan a screen shot of the error you're getting: dan@hybridz.org The issue is with the additional security added since the big hack earlier this month. According to Dan its gone ape **** and is blocking people it shouldn't.
  21. John Coffey
    Security issues. I wasn't able to get into the site until this morning. Should be cleared up by now.
  22. John Coffey
    If the brake balance is right, the 4x4 front caliper upgrade helps a little with increased heat capacity, mostly due to increase fluid capacity in the caliper and increased caliper mass. If you go the vented rotor S12W caliper you'll get a significant increase in heat capacity.
  23. John Coffey
    Any of these exhausts will work on your car. #1 and #3 will give you better performance with #3 being the better choice because its significantly lighter.
  24. John Coffey
    My 350Z used progressive bump stops in front as part of the spring rate. They engaged after about 1.5" of bump travel. Its a common practice on new cars.
  25. John Coffey
    There are no bump stops on the 240Z control arms.
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