jmortensen Posted October 7, 2008 Share #37 Posted October 7, 2008 Can anyone better at math and physics than me work backwards off of the wind tunnel data and figure out what the downforce would be at lower speeds? I'm sure that it is possible... Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-262653 Share on other sites More sharing options...
tube80z Posted October 8, 2008 Share #38 Posted October 8, 2008 Can anyone better at math and physics than me work backwards off of the wind tunnel data and figure out what the downforce would be at lower speeds? I'm sure that it is possible...Force@lowspeed = Force@highspeed x (lowspeed^2 / highspeed ^2)So for 55 MPH I get ~32 lbs. So Tom's measurement is pretty close. That said I can measure this on a stopwatch and so can a number of CSP miatas I run against (Jim Daniels/Ron Bauer).Cary Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-262788 Share on other sites More sharing options...
tholt29 Posted October 9, 2008 Share #39 Posted October 9, 2008 ...but my spoiler has roughly 2X the area of the wind tunnel test unit. I wonder if spoiler area has a linear relationship here. The wind tunnel test showed about 22 lbs downforce with the MSA spoiler, 50 lbs with the 5.25" spoiler... or 77 and 105 lbs total change. Also keep in mind my measurements were at the rear of the hatch versus at the road. We will probably never know the real answer, but thats the nature of bench racing! Tom Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-262816 Share on other sites More sharing options...
260DET Posted October 24, 2008 Share #40 Posted October 24, 2008 My first run on Thursday:http://www.vimeo.com/1803106.........................................................................................-RickLove that HD video, the picture quality makes incar much more interesting. Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-264267 Share on other sites More sharing options...
preith Posted October 24, 2008 Share #41 Posted October 24, 2008 Love that HD video, the picture quality makes incar much more interesting.Agreed, one of the higher quality ones I've seen lately. What was it taken with?Also, Rick what broke on the car?On a side note I must to say the first thing I immediately notice with many vid's is the bare skin. I wasn't too keen on the fire suit when I first started but feel naked without it now. Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-264323 Share on other sites More sharing options...
fp280z Posted October 25, 2008 Share #42 Posted October 25, 2008 Agreed, one of the higher quality ones I've seen lately. What was it taken with?Also, Rick what broke on the car?On a side note I must to say the first thing I immediately notice with many vid's is the bare skin. I wasn't too keen on the fire suit when I first started but feel naked without it now.Thanks. The video was taken with just my point-and-shoot Canon PowerShot SD450 on a rollbar mount.As for what broke, something wanted out of the tranny bellhousing and made its way out. My theory is that my clutch was not adjusted properly and the throwout bearing was dragging, finally giving up on my second run. With the stock hydraulics and stiff pressure plate it takes some time to get it adjusted just right. I adjusted it before Nats and still had plenty of freeplay at the actuator arm but I guess I was a little off and it started "pumping up", eventually enough to take up the slack I had adjusted in.Just a theory, I haven't pulled the trans yet.-Rick Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-264432 Share on other sites More sharing options...
fp280z Posted December 3, 2008 Share #43 Posted December 3, 2008 Looks like my throwout bearing theory was incorrect. My best guess is that the rivet on the pressure plate spring failed and vibrated everything else loose, eventually throwing two of the clutch cover bolts and two of the dowel pins out of the tranny.http://www.typeischeap.com/clutch2008.html-Rick Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-267957 Share on other sites More sharing options...
preith Posted December 4, 2008 Share #44 Posted December 4, 2008 (edited) Looks like my throwout bearing theory was incorrect. My best guess is that the rivet on the pressure plate spring failed and vibrated everything else loose, eventually throwing two of the clutch cover bolts and two of the dowel pins out of the tranny.http://www.typeischeap.com/clutch2008.html-RickThanks for the pics. It's a shame but perhaps you can still save the flywheel. Why not abandon the old mounting holes, rotate the pressure plate, drill and tap new ones?EDIT: One more thing to add. My coworker had ring gear issues with his Fidanza flywheel (DSM app) and sent it back to them. For $50 they rotated and tapped new ring gear mounting points, installed a new ring gear, and replaced the friction surface for free! Email their tech department: tech@fidanza.com. Their turn around is a bit slow, but they will respond eventually. Edited December 4, 2008 by preith Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-268066 Share on other sites More sharing options...
jmark Posted August 25, 2009 Author Share #45 Posted August 25, 2009 JT, Rick and Tom you headed back to the SCCA Nationals this year? Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-292831 Share on other sites More sharing options...
tholt29 Posted August 25, 2009 Share #46 Posted August 25, 2009 Of course! Wouldn't miss it! If I don't let John beat me at least once a year I start going through withdrawals!:classic:It should be a good year. We're back on concrete. The class has 18 registered and we have a few new cars amongst the regulars. 6 different Z's, an M3, an Evo, a 911, a 914-6, an S2000 and a Mini Cooper S. The BMW and Evo should both be major threats. Run order has just been posted and we are in the first heat on Tuesday and Wednesday... I just hope the weather cooperates.Tom Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-292833 Share on other sites More sharing options...
John Coffey Posted August 25, 2009 Share #47 Posted August 25, 2009 Go Toby! Sorry guys, Toby's one of my best customers. Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-292834 Share on other sites More sharing options...
fp280z Posted August 31, 2009 Share #48 Posted August 31, 2009 I'll be there too of course! As Tom said, on paper it's looking like a great year for FP. +1 on the weather cooperating!!! (Although my only National trophy in FP was helped out by first day drying conditions in 2007. Hmm.)Hey John, I may not be your best customer but I will be running the hood I bought from you this year! -Rick Link to comment https://www.classiczcars.com/topic/29285-good-luck-to-the-z-racers-at-the-solo-nationals/?page=4#findComment-293424 Share on other sites More sharing options...
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