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  1. J

    What about Kumho XS Tires?

    Bruce, the XS is a great street tire, but it is not going to be as fast as a Michelin PSC on track. Its peers are tires like the Bridgestone RE01R, Yokohama Advan Neova AD07, Toyo T1R. It's in the top tier of street tires, which are still a half-step below something like the PSC or Victoracer...
  2. J

    315 front tire and wheel question

    Would certainly be better on a 2" wider wheel, but still in the realm of OK for us wheel-width-limited folks.
  3. J

    Finally a real member!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    Cool stuff man, and since I forgot to say it earlier, congrats! :)
  4. J

    Finally a real member!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    Why the gears Mark? Might make a decent ASP car without 'em.
  5. J

    315 front tire and wheel question

    I'm pretty sure John can make the SP16 in 18x12. What he doesn't offer is the "Classics" in 19" diameter, which is too bad, that's my favorite CCW. I don't know about the Kumho XS, but in my experience, for cornering, tires almost always perform their best when given a wheel a little bit...
  6. J

    315 front tire and wheel question

    The 315's are pinched a little bit on the 10" wheels. Unfortunately the class I race in (SCCA Solo's Super Stock) limits me to stock width wheels, so I'll have to use them with the 335's also. The wear pattern is actually pretty good though with a big front swaybar and max'd out camber...
  7. J

    315 front tire and wheel question

    Bruce, I run a 315/30-18 Hoosier up front on stock width wheels, which have 1/4" less offset than stock. Sort of the opposite direction you're thinking of going. They fit fine, though my car is a non-ACR at stock ride height. I'll be going to 335's next. If you're on stock-width wheels...
  8. J

    Wheel Hop

    Bruce, for the last several years, Pro Solo had done 4 runs back-to-back-to-back, so it's really only an issue on the first of those 4 runs. You can do a burnout too if you wish. Wheelhop sucks, and breaks stuff if you let it - I always back out of the gas when it starts. For those with...
  9. J

    Comp coupe anti-roll bar Qs

    Sorry, didn't mean to imply you were - I attempted to address that paragraph to Dan (Viper X). I don't think stiffer front springs are a proper prescription to remedy understeer unless you already knew said understeer was the result of a bottoming condition. Even then, stiffer springs usually...
  10. J

    Comp coupe anti-roll bar Qs

    Grant, you can probably have the center be solid, or hollow with a wall thickness of your choice. You can check out the components to build one yourself here: Genesis Technologies Cockpit Adjustable Race Car Sway Bar Kits Race Car Cockpit Adjustable Swaybars and Components Note, you...
  11. J

    Comp coupe anti-roll bar Qs

    I think the car gets a lot better with more front tire, and you'll be quite happy with it. My suggestion to have a bit more front bar/spring standing by is in case you start to have diff issues out of low-speed corners. Increased front grip without an increase in front % of roll resistance...
  12. J

    Comp coupe anti-roll bar Qs

    Grant, I did a bit of digging, but never picked up the phone to talk to Dodge Racing, who will probably be the only ones able to credibly answer your questions. That aside - I believe there are two flavors of CC bars out there. One set are a stock-style, but stiffer than stock, set...
  13. J

    Track day Videos (Please add yours)

    http://www.jrho.com/ElToro_SunRight.wmv Autocross video from early last year, hope to get some more this season. Sorry for shaky cam, will work on that!:)
  14. J

    A cars weight doesnt affect its top speed...right?

    You're totally right, I tried to acknowledge I was largely reiterating your post. I really suck at being succint. It just seemed like it hadn't sunk in for some folks. Bob, your post #2 is a good example. The heavier car will not need more power to reach the same speed in this...
  15. J

    A cars weight doesnt affect its top speed...right?

    Variables...there are many at play. Part of the reason I suggest people keep from getting outside of reasonable ranges (in this case weight) is because it tends to make important, variables that wouldn't normally be a factor in reasonable ranges. At 50,000 pounds, a Viper would not move very...
  16. J

    A cars weight doesnt affect its top speed...right?

    Energy is the application of horsepower over a period of time. PAVenom, using your formula for kinetic energy, the 50000lb Viper will have a lot more energy when it reaches its top speed. What you're missing is the engine is adding energy to the equation the entire time the car is moving...
  17. J

    A cars weight doesnt affect its top speed...right?

    If you put a 50k pound trailer behind a Viper, and that trailer contributed no change to the overall aerodynamic or mechanical drag profiles of that Viper, it would have no affect on the vehicle's top speed. It will take 14-15 times as long to reach that speed, but it would still do it. Not...
  18. J

    A cars weight doesnt affect its top speed...right?

    Guys, let's not get crazy here. If you put 46,500 pounds into a Viper you'd crush it into scrap. Yay grandma on a bigwheel has a higher top speed. So what? The distinction many have trouble making is how slower acceleration does not necessary mean a lower potential top speed. Sure, it...
  19. J

    A cars weight doesnt affect its top speed...right?

    Cars at Bonneville add a ton of weight to increase stability on the salt flats. Sure, there will be increases in rolling resistance, but assuming you put the car together to operate properly at whatever weight you're running it (rake, ride height, tire size/inflation pressures, etc.) the...
  20. J

    HUGE hp number with 5 into 1 headers!

    I think it would be fun to do the 5-1 header, with whatever oiling/valvetrain mods needed to rev to 6500-7k rpm reliably. Then, instead of changing the rear gear, leave it and first gear alone, but tighten up the transmission internal gear ratio gaps from 2nd-6th. A stock Viper is geared to go...
  21. J

    New Tire Choice - Kumho ECSTA XS

    The scoop I got on these tires from a Kumho-sponsored autocrosser, who tests cars for a living, is these tires are on par with the other current ST tires Grant mentioned (Yokohama Advan Neova, Bridgestone Potenza RE01R, Dunlop Direzza, Toyo T1R), with better-than-average heat handling...
  22. J

    Viper Loading on a Trailer "How Too"??

    The Viper is close to 50/50 weight distribution so the old load-it-forward-for-tongue-weight adage doesn't really apply in an enclosed trailer. Do whichever makes it easiest to load/unload and ingress/egress, and regardless of which way you go, make sure the load is well positioned for safe and...
  23. J

    Wanted: your old 335/30-18 or 345/35-18 Hoosier A6 in So Cal

    I am looking for an old worn out 335/30-18 and 345/35-18 Hoosier A6 tire (R6 would probably work too) to use for test fitment on my SRT-10. Hoping to find something in So Cal (San Diego preferably) that I can pick up. Thanks for your help, moderators please move if this is an inappropriate...
  24. J

    For those interested in KW Shocks

    Does anybody have shock dynos of the Viper-application KW V2 and V3, as well as the ACR shocks at max and min settings? Does anybody know the fully compressed and extended free lengths of the ACR and non-ACR shocks? Thanks,
  25. J

    ACR wing adjustment?

    I didn't forget it, just figured we didn't want to get into stuff in the fourth position right of the decimal point. :) There are plenty of second-order factors we could take into account (loss of front DF through rake change for instance) but if the largest factor is insignificant, so shall...

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