{"id":1845,"date":"2013-04-01T00:16:50","date_gmt":"2013-04-01T07:16:50","guid":{"rendered":"http:\/\/www.rhoadescamaro.com\/build\/?p=1845"},"modified":"2013-04-01T00:27:24","modified_gmt":"2013-04-01T07:27:24","slug":"2013-san-diego-national-tour-test-tune","status":"publish","type":"post","link":"http:\/\/www.rhoadescamaro.com\/build\/?p=1845","title":{"rendered":"2013 San Diego National Tour \/ Test &#038; Tune"},"content":{"rendered":"<p>An <a href=\"http:\/\/www.scca.com\/solo\/content.cfm?cid=44511&amp;tag=60\" target=\"_blank\">SCCA National Tour <\/a>is a big event, lots of people from all over come out, usually on fresh tires and stuff, bringing their best to see how they stack up against some of the competition they&#8217;re likely to see at the National Championships later that year.<\/p>\n<p>Tours\u00a0are a 2-day events, 3 runs per day.\u00a0 Not a place to get some extra runs in for practice.\u00a0 Generally not the best place to debut a car.<\/p>\n<p>So of course,\u00a0that&#8217;s what I did.\u00a0 They kindly have a sort of test-and-tune the Friday before, but I didn&#8217;t make that either, working on the car up until 4pm or so that Friday.<\/p>\n<p>Thankfully,\u00a0it held together.<\/p>\n<p><a href=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/IMG_7520.jpg\"><img loading=\"lazy\" class=\"alignnone size-large wp-image-1843\" alt=\"Jason Rhoades STX Camaro at 2013 SCCA San Diego National Tour\" src=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/IMG_7520-1024x682.jpg\" width=\"550\" height=\"366\" srcset=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/IMG_7520-1024x682.jpg 1024w, http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/IMG_7520-300x199.jpg 300w, http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/IMG_7520.jpg 1028w\" sizes=\"(max-width: 550px) 100vw, 550px\" \/><\/a><\/p>\n<p>At least, mostly&#8230;will get to that later&#8230;.<\/p>\n<p>First things last &#8211; results were terrible.\u00a0 Myself and the car were extremely slow&#8230;much slower than I thought.\u00a0 Averaged about 5 seconds per day off the pace.<\/p>\n<p>When I first built the 240sx for STS, ran it once stock, with just some used Falkens (then an ok tire) and was about 4 seconds off the pace.\u00a0 Granted, the 240sx was a rather well-balanced and neutral car from the factory, whereas the Camaro is awful, but in this case, I am an extra second back, and the car already has everything done to it!<\/p>\n<p>There are a few explanations (excuses, perhaps) that might help make the outlook appear less awful than it otherwise might-<\/p>\n<ul>\n<li>The car really only had about 20 miles on it going into the event.\u00a0 The engine had been broken in on the dyno but everything else &#8211; rear end, transmission, steering, brakes &#8211; were all either rebuilt or new.\u00a0 This had me being a\u00a0little more conservative than otherwise.<\/li>\n<li>The car was too loud for SD so sound meter shenanigan-erry impacted the times somewhat.<\/li>\n<li>I am on a previous-generation tire, the Yokohama AD08, the competition was on Dunlop Z2.\u00a0 Not sure how much difference that makes, possibly only a tenth or two, possibly more.<\/li>\n<li>I have not driven competitively on street tires in a long long time.\u00a0 Last year at the El Toro ProSolo I ran Michael Heinitz&#8217;s car on street tires, and ended up running about a second off his times (on a shorter ProSolo course) &#8211; which means\u00a0I was probably giving up 1.5-2 seconds just not driving well (more on that later too).\u00a0 I take a while to adapt to a car and get fast in it.\u00a0 Took me 3 years in the Viper!<\/li>\n<li>The initial setup was way off (let&#8217;s get to that now!)<\/li>\n<\/ul>\n<p>Almost every picture I&#8217;ve EVER seen of a first gen Camaro going around a corner, the outside front tire is unhappy at terminal roll.\u00a0\u00a0 Remember these?<\/p>\n<p><a href=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/6r4p2.jpg\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-1850\" alt=\"6r4p2\" src=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/6r4p2.jpg\" width=\"668\" height=\"410\" srcset=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/6r4p2.jpg 668w, http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/6r4p2-300x184.jpg 300w\" sizes=\"(max-width: 668px) 100vw, 668px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/history-1.jpg\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-1849\" alt=\"history-1\" src=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/history-1.jpg\" width=\"535\" height=\"283\" srcset=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/history-1.jpg 535w, http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/history-1-300x158.jpg 300w\" sizes=\"(max-width: 535px) 100vw, 535px\" \/><\/a><\/p>\n<p>I wasn&#8217;t going to let that be me!<\/p>\n<p>Taking it further, people think &#8220;wheel perpendicular to the surface&#8221; is an ideal, but in my experience it&#8217;s not, especially with street tires, due to carcass (and even wheel)\u00a0deformation under load.\u00a0 So I gave the car a lot of negative camber up front &#8211; minus six degrees.\u00a0 Now, the tables were turned, and instead of me thinking\u00a0everybody has\u00a0too little\u00a0negative camber,\u00a0now everybody\u00a0approached me to\u00a0remark on how much negative camber I had.\u00a0 They couldn&#8217;t believe minus 6!<\/p>\n<p>Another thing I&#8217;ve heard, is the cars always understeer.\u00a0 This makes sense too, because of how bad the geometry is, and how people tend to run so little front tire.\u00a0 Easy to fit a lot of rear tire, and while a leaf sprung live axle isn&#8217;t winning any engineering awards these days (or even in the 60&#8217;s), at least it doesn&#8217;t put the outside tire on its outer sidewall in a corner.\u00a0 Guys have to sell their souls to make the cars turn.<\/p>\n<p>Not gonna let that be me!<\/p>\n<p>Car got relatively stiff rear springs, and I&#8217;d set initial position of the watts link center pivot rather high.\u00a0\u00a0 The pivot point determines the rear roll center, and having a high rear roll center means the linkages are taking a lot of the roll moment instead of the springs, which makes it roll less, and shifts the balance towards oversteer.<\/p>\n<p>So, the good news is, I was able to put together a first-gen Camaro that doesn&#8217;t understeer!\u00a0 \ud83d\ude42\u00a0 The bad news is it was extremely &#8220;loose&#8221; as we say, wanting to kill me with just about every (admittedly not as smooth as they could be) steering input.<\/p>\n<p>It didn&#8217;t really occur to me while running, how loose the car was.\u00a0 It wasn&#8217;t until I saw my in-car video on Saturday that it became clear how bad it was.\u00a0 Between days I softened the rear shocks considerably (which were set where they were when shipped &#8211; full stiff on all 4 settings) &#8211; taking them from basically 30\/30 to 3\/30 on each of the adjustments.\u00a0 The reduced axle control did produce some axle tramp on Sunday so I&#8217;ll have to get some of it put back in, especially for the ProSolo launch.<\/p>\n<p>Below is a link to a Sunday run video &#8211; the file is rather large, but I don&#8217;t feel like giving Youtube the rights to it, so you&#8217;ll have to download from me (~183MB):<\/p>\n<h2><span style=\"color: #0000ff;\"><strong><span style=\"color: #000000;\">Video:<\/span> <a href=\"http:\/\/www.rhoadescamaro.com\/build\/wp-content\/uploads\/2013\/03\/sdTourDay2Run2.mp4\"><span style=\"color: #0000ff;\">Jason Rhoades STX Camaro sdTourDay2Run2<\/span><\/a><\/strong><\/span><\/h2>\n<p>The quality isn&#8217;t bad, but not perfect either &#8211; the camera is mounted to the passenger seat which shakes a little &#8211; ran the video through some stabilization software that makes it less dizzying, but also makes the video appear a bit foggy IMO.\u00a0 Will work on better securing that seat.<\/p>\n<p>Very happy with camera position though.\u00a0 I feel it is extremely important to be able to see the driver&#8217;s input in a\u00a0car video, and this spot picks up not just wheel (most crucial) but also pedals, which is neat.\u00a0 If the camera had been in one of the traditionally useless places like on the roof or the hood, it would be much less obvious from the video, how loose the car was.<\/p>\n<p>All this said, a good pile of excuses that adds up to three, maybe four seconds.\u00a0 Finding that fifth second is going to take some kind of real breakthrough, hope I can find it at some point.<\/p>\n<p>###<\/p>\n<p>Continuing the story of the weekend, the car made it through Saturday fine.\u00a0 Jonathan Lugod brought a\u00a0serious big nylock nut after first or second runs that day, saying someone thinks this fell off your car while on course\u00a0&#8211; it didn&#8217;t occur to me at the time but it did later, I had dropped that nut inside the front crossmember while fastening the rear bolts for the front lower control arms.\u00a0 I fell into an impossible chasm there (at which point I just went and got another one),\u00a0and the motions of autocross must have worked it loose!<\/p>\n<p>Saturday night I didn&#8217;t disconnect the battery, and something in the system drained it\u00a0down to 11 volts.\u00a0 This was bad, was barely able to get it started, then kept it running through first two runs Sunday.<\/p>\n<p>Coming in from my second run,\u00a0discovered the passenger side header bolts had worked their way loose.\u00a0 Apparently this is a common problem with new header installs. \u00a0I have some fancy &#8220;Stage 8&#8221; fasteners on there with locking tabs that keep the bolts from rotating, but unfortunately hadn&#8217;t had a chance to put the tabs in yet, so they were all quite loose.\u00a0 Shut the car off to tighten them&#8230;and then couldn&#8217;t get it restarted.\u00a0 Some of that is heat soak &#8211; especially with headers, these cars are notoriously hard to start once the starter solenoid gets hot.\u00a0 It was really disappointing, as I was starting to get a feel for the car, loose as it was (download the video above if you haven&#8217;t already).<\/p>\n<p>This is where I start thanking a long list of folks &#8211; several tried to help get it bump-started &#8211; Jeff Cawthorne, Steve O&#8217;Blenes, Charlie Davis, and probably a few others I didn&#8217;t see.\u00a0 It was fruitless, so Charlie let me run his BMW (huge thanks Charlie!!) as his co-driver Bryan Heitkotter couldn&#8217;t make it today.<\/p>\n<p>Hadn&#8217;t driven an STX 325 before, and this was a huge opportunity &#8211; to experience the car that the leader from day 1 was in, the same car that won Nationals the year before, and was my main competition.\u00a0 It was also a lot of fun!\u00a0 The car was very well balanced, power was &#8220;okay&#8221;, overall it didn&#8217;t have any faults.\u00a0 Made me realize even more, how badly the Camaro had been trying to kill me with ridiculous oversteer&#8230;<\/p>\n<p>Dropped almost three seconds with that one run in Charlie&#8217;s car.\u00a0 Still 1.5 seconds back from the day&#8217;s (and overall) leader Jeff Stuart&#8217;s time&#8230;which shows again how much I am leaving on the table as a driver at this point.\u00a0 Jeff was a ways back from Bryan on day 1 but felt day 2 would have been much closer.<\/p>\n<p>After the run group finished several people helped me work on diagnosing an ignition issue that seemed to develop somewhere that day &#8211; this just goes to show you how awesome and helpful the SCCA autocross community is!<\/p>\n<ul>\n<li>KJ Christopher, who lent me electrical tools and wires, not to mention many electrons charging up the car&#8217;s battery, and my now-depleted jump pack<\/li>\n<li>Eric Clements, who help the voltmeter on some potentially zappy things while I turned the engine over in troubleshooting<\/li>\n<li>Fred and his wife Alexandra Zust, who helped me push and ratchet the very heavy car up into the trailer on a warm day.\u00a0 Also to the other fellow helping whose name I didn&#8217;t catch.<\/li>\n<\/ul>\n<p>Thanks to all of you, you guys all rock!!<\/p>\n<p>Have a lot of planned changes in mind to implement for next weekend, the El Toro ProSolo.\u00a0 The increased grip provided by the surface there should make the car tend towards understeer a touch, but I&#8217;ll be lowering the rear roll center and increasing front swaybar stiffness anyway.\u00a0 Need to put some more rear shock damping in to tame the axle tramp, which you can hear in a couple places in the video.<\/p>\n<p>Last thought here is just on how much fun this thing is to drive.\u00a0 It is going to teach me throttle (and brake!) control like I haven&#8217;t needed since running Gary Thomason&#8217;s SM2 Corvette in 2005.\u00a0 There are some similarities &#8211; obviously this is a lot less powerful, but the power:grip ratios feel somewhat similar in that overaggressive application of throttle (the sort of move that would be perfectly fine in any other ST category car) zings the back tires in a way that makes you think you&#8217;re either out of gear or have a badly slipping clutch.\u00a0 If we ever get a good ProSolo launch surface the thing will be an ANIMAL!\u00a0 \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"<p>An SCCA National Tour is a big event, lots of people from all over come out, usually on fresh tires and stuff, bringing their best to see how they stack up against some of the competition they&#8217;re likely to see at the National Championships later that year. Tours\u00a0are a 2-day events, 3 runs per day.\u00a0 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21],"tags":[],"_links":{"self":[{"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=\/wp\/v2\/posts\/1845"}],"collection":[{"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1845"}],"version-history":[{"count":16,"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=\/wp\/v2\/posts\/1845\/revisions"}],"predecessor-version":[{"id":1863,"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=\/wp\/v2\/posts\/1845\/revisions\/1863"}],"wp:attachment":[{"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1845"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.rhoadescamaro.com\/build\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}