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  1. S

    Used PWC tires for track days?

    I'm with Terry, on this... Sort of. I didn't do the 305's, I ran a couple sets of CTSCC 275/645-18 slicks on my Enduro car, and while they were stickers, they "felt" like a slightly dead Hoosier R6 (which was my prime rubber) in the same size. What the CTSCC tires did, though, was wear like...
  2. S

    Seat belt question

    WAYYYYY above the iliac crest... That buckle is above your navel, and is supported not by bone, but by internal organs. In a 15mph crash, that'll hurt, and may cause internal injury. In a 100mph crash, that will kill. This is also EXACTLY the point that I was making about fitment. When you...
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    Seat belt question

    Guys, think about safety gear as part of a comprehensive package, and a lot of this will make sense. The OEM 3-point belt will stretch due to the lengths of the legs involved, and that will decelerate your torso and head. This *RELATIVELY* gentle deceleration is complemented by those soft...
  4. S

    Torque arm and Watts Link added...

    First off: I do NOT have a Watts on my race car. However, I have driven (and raced, as in competition license raced) a LOT of S197s, with Watts links and Panhard bars on track, so I think I have a decent perspective on this. 1) I personally don't "feel" enough difference on a full-sized...
  5. S

    Torque arm and Watts Link added...

    Two words: brake tramp. Or, "axle hop" if you prefer.
  6. S

    Steering rack mods

    To add to what Kerry said, IN GENERAL toe-in helps with stability, but toe-out helps with turn-in... The drag guys usually go zero toe strictly to minimize rolling resistance. I run factory toe-in on my daily driver, but the race car? 1/8" toe-out with -2.75* camber. Turns in nicely, with...
  7. S

    Seats and Oil

    Oil level is simple... Standard fill, then add 1/2 quart, done. For the seats, PARTICULARLY for your first HPDE, I wouldn't bother. You're going to have enough on your plate without having to worry about airbag sensors, dash lights, alteration from your "normal" driving position, etc. With...
  8. S

    2007 V6 S197 vs a SN95 GT (02-04) for HPDE

    To me the biggest thing to focus on in HPDE (besides the general fun factor, of course!) is pure driver development. A Miata is easier on consumables: a set of slicks runs about 1/3 of what it costs to put new shoes on a Mustang, and don't even get me started on brake pads and rotors! It's...
  9. S

    2007 V6 S197 vs a SN95 GT (02-04) for HPDE

    Miata.
  10. S

    Sky Render's Build Thread

    Yes, they do. Pull the center nut that holds the strut to the plate; nothing on the plate should shift, or it's a crap design. This trick will require spring compressors if you're running stock-height springs, but with most "lowering springs," the free length is short enough that there's no...
  11. S

    Sky Render's Build Thread

    There is no magic measuring equipment needed, just patience. It's actually easier and faster to do the bump-steer with bare struts (no springs) installed. 1) Install the springs/struts/plates (take all slack out of the strut/knuckle interface towards negative camber), settle the suspension...
  12. S

    Sky Render's Build Thread

    The stock Hydro bushings are bonded to the control arms at manufacture, so there's no "simple" way to pull 'em off the old arms and slap them on the new ones. The 302S arms come with a bare stub at the rear end, and are intended for the end-user to add their own poly or delrin bushings. The OE...
  13. S

    Sky Render's Build Thread

    Simple answer is that if you've lowered the car, the roll center up front has dropped. Period. IF you feel that is an issue, then then solution is to lengthen the ball joint stud or raise the attachement points on the inboard end of the LCA. Either one will create a bump-steer issue that then...
  14. S

    How much is too much?

    I don't know off the top of my head what the "P" rear spring rates are, but I'll bet they're at (or under) 200lb/in. With 3/4" static clearance between the frame rails and the bump-stops, that would allow you less than 150lbs of load transfer to that spring before you're on the bump-stop and go...
  15. S

    BMR K-Member and A-Arms on Road Courses?

    Very well said, Kelly, and I applaud your honesty and candor.
  16. S

    Sky Render's Build Thread

    Raising the front roll center will help if the nose is falling over in the turns. Adding wheel rate will do the same, as well. If you're in a testing mood, try going full-stiff on the bar up front. It might just surprise you!
  17. S

    First full track day - front end push!

    I'll admit, I couldn't find the rate specs on the Sportlines, including on Eibach's website... If they are typical of the (lowering spring) genre, they'll be in the high-180's to low 200's and progressive in front, and with the rears running between 20 and 40 lb/in lower than the fronts. For...
  18. S

    First full track day - front end push!

    I have to disagree. How do you alter the "handling balance" of the car if the grip at each end remains the same? Max potential grip is absolutely only affected by the tires. Max achievable grip, however, depends strictly on maintaining the "best" contact patch. Correct, as far as it goes...
  19. S

    First full track day - front end push!

    Kerry is absolutely correct so far as it goes, and if you read books like "Tune To Win" by Carrol Smith, it all makes sense. However. The fly in the ointment here is that all of the above assumes proper contact-patch management. Remember that every control input to the car translates...
  20. S

    Rake

    Sounds like our Matrix races. It's fun stuff, actually. Hell, in any event, RACING is fun!
  21. S

    Rake

    LOL!! Yes, we use the term "sandbagging" as well, for holding back pace to gain an advantage when there are handicaps involved... FWIW, during the Matrix and Pursuit races, while there was no outright "ban" on lap timers, use was discouraged... Made it more fun that way. The race formats...
  22. S

    Rake

    I figured it had to be something from the supercars; beautiful engineering on that whole kit, particularly in the pillow-block retention, which is the key to everything. I still don't see how an in-car adjuster (electric motor, maybe? with a gear-reduction for the needed torque?) could possibly...
  23. S

    Rake

    Kerry: driver-adjustable Watts RCH??? I'm assuming it's set up with some sort of jack-screw, and has the pivot joint in a captive cage? Any chance you would have a pic or two? I can't get my head around the amount of leverage needed for the cockpit control. I COMPLETELY hear what you're...
  24. S

    Rake

    Absolutely agree, HOWEVER, the spec you gave was from ground to fender arch, and tire OD will affect that number. The FR500C manual lists two places to take measurements from to determine "proper" ride height, and they are tire-independent. I'm not certain where it was up front, but I believe...
  25. S

    Rake

    Kerry, I just want to check this... What size tires? You still have the FR500C extended-length ball joints on it, right? Only reason that I want to bring this up is to make the point that "everything depends on everything else." (Not aimed at Kerry, as I know he knows this) Ride-height does...

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