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  1. J

    How to Drive a Viper

    Take it to an autocross.
  2. J

    OS Giken Differential in Viper

    Here's a really nice article on the guts and tuning of the OS Giken diff, most of the tech applies to any clutch-type diff. Though the car it's going into is an NSX, the same principles apply to the Viper. Project NSX Part 2, Tuning a Limited Slip Differential; Tricks of the Pros
  3. J

    ACR-X wheel sizes don't make sense???

    They use stock size wheels because that's what they have lying around, but clearly kept 18" compatibility in mind. Doesn't seem to matter much what tires are OEM, as people will have to change them out for their race series.
  4. J

    ACR-X at Laguna Seca...what tires did they use?

    R6 would be 1-1.5 seconds faster than the PSC on a track of Laguna's length, fresh vs. fresh. A full-on non-DOT slick would be 1-2 seconds faster than the R6. A6s somewhere between those two given cooperative weather. ACR-X was stated as being 160lb. lighter than regular ACR, that accounts...
  5. J

    Easy Way To Lower Weight

    Race seats are more of a pain for street driving ingress/egress but really shine when you start pushing the car hard. The best seat is the one you never think about while driving. The stock seats IMO are some of the best all-pupose factory seats ever put in a car, but they still aren't ideal...
  6. J

    DIY Alignment?

    Yes true, but you should also agree it does not affect camber, caster, or toe. I figure the audience should try to swallow that bit before introducing further confusion via RCH, FVSA lengths, etc.
  7. J

    Wide Open Parking Lot

    Camera and the software is from Chasecam - Solid State Digital Video Recording Systems and Cameras | ChaseCam Having the camera in the car makes the video a thousand times more useful to me for post-race analysis, you can see the inputs the car is getting. Some of the information displayed...
  8. J

    Request TSB for 2003-2006 Limited Slip Differential

    I don't think "comfortable" is the right word for it. The newer diff will make the car faster and more reliable, plain and simple. I don't care if the diff breaks while I'm autocrossing, it's safe there. Seems like some people have had diff failures out on the public streets where there...
  9. J

    DIY Alignment?

    If you have found repeated negative camber "gains" from shorer tires, it speaks only to an error in measurement technique. Think about it - how are you getting that camber change without a toe change? Or do the shorter tires also change toe somehow? Tire diameter does not affect suspension...
  10. J

    Wide Open Parking Lot

    Here's an in-car video from a recent autocross. You can see I spend about half of the time in first gear. Lots of big steering inputs to get around the tight-ish course, but the car is in great shape the whole time, and I can use full throttle in first gear on several occasions.
  11. J

    Request TSB for 2003-2006 Limited Slip Differential

    Autocross is a competitor-policed sport. Part of the reason I'm basically the only guy trying to campaign a stock Viper in the SCCA is that everyone else is afraid of the diff. With a bit of experimentation I've been able to get it to work okay but its behavior is still rather inconsistent...
  12. J

    Wide Open Parking Lot

    Autocross is a great way to get used to the way the car behaves with a lot of throttle in the lower gears. I find the Viper is actually quite tame, it puts power down well. Still, you can't forget you've got 5-600+ horsepower, so you have to remember to use the gas pedal like a rheostat and...
  13. J

    Why did youbuy a Viper ??

    Bought it to show the Viper can be a great autocross car even in Stock form, and that you don't have to have a Z06, GT3, or Elise to win the SCCA's Super Stock class.
  14. J

    What to do in Detriot

    Anybody have any more information about these Viper-specific autocrosses? Is it some sort of real series? Who's driving for SRT, Winkler?
  15. J

    DIY Alignment?

    Shorter tires will lower your CG but they aren't going to change suspension geometry, including camber.
  16. J

    OBDII and Tools

    Thought I'd bring this back up, I have basically the same question - what protocol does the 2003-2006 SRT-10 use for OBD2? I'm looking at purchasing a device to integrate the OBD data with my racing data acquisition system. The device is compatible with the following protocols: J1850VPW...
  17. J

    Request TSB for 2003-2006 Limited Slip Differential

    Hello, Hoping this catches the eyes or ears of individuals within Dodge. I would like to request a Technical Service Bulletin applicable to 2003-2006 Dodge Viper SRT-10s. This TSB would authorize replacment of the OEM Dana "Hydra-Lok" differential with the newer GKN "Visco-Lok" unit as...
  18. J

    J-Rho autocrosses an SRT-10 in SCCA SS class

    Here are some video links to my runs 1, 2, and 3 on the West course. On another note, since it looks like I'll be sticking around in Stock class, I have a few parts for sale somebody might be interested in. Fidanza aluminum flywheel for Gen 3- used Stock Gen 2 steel flywheel, used -...
  19. J

    Need wheel ideas

    Mark, which 18" 335 tire are you planning to run? Don't see that size in V710..?
  20. J

    J-Rho autocrosses an SRT-10 in SCCA SS class

    Got home last night from Lincoln Nebraska. The trip to Nationals this year had some ups and downs. The Pro Solo got off to a slow start. The course was a lot of fun, but due to it being largely speed-maintenance gave an edge to the Lotus Elise. The lead Elise driver had a killer weekend...
  21. J

    J-Rho autocrosses an SRT-10 in SCCA SS class

  22. J

    J-Rho autocrosses an SRT-10 in SCCA SS class

    I think it does, just hard to see with the angle, and so many spokes.
  23. J

    J-Rho autocrosses an SRT-10 in SCCA SS class

    With all this chatter about diffs, kinda neat to see one chattering in action. Watch the outside rear wheel from the :36 to :42 second mark in this cool high-speed-camera video: PCA OC AX This was from an OCR PCA event yesterday. Car worked great, loading it on the trailer tomorrow for the...
  24. J

    J-Rho autocrosses an SRT-10 in SCCA SS class

    Hi George, Yep, that's the case. A lot of time manufacturers will issue TSBs or otherwise revise a given part to fix different problems that show up over the life of a car. They might authorize a special repair procedure, or specify a different part altogether. I can only use the later diff...
  25. J

    J-Rho autocrosses an SRT-10 in SCCA SS class

    Seems like the spider gears really take a beating in these diffs. I bought a "put in the car but not really used" used diff recently for good money, and this is how the spider gear looked. I should've just bought a brand new Hydra-Lok but ran out of time. I expect the tooth at 7:30 on the...

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