Monthly Archives: August 2010

Miller Lessons Learned

Some interesting takeaways from the Miller Race:

  • Shocks: Chris Billings at the Shock Shop worked on my shocks before the race. The end result is that the car is absolutely transformed. It soaks up the bumps, rides the curbs
    like they’re not even there, and the turn-in/corner-exit characteristics are much, much nicer. Additionally, the car is quite a lot more driveable. As it starts to slide and give way, it does so much more gradually. I can’t wait to return to HPR and see how it’s going to work there.
  • Weight: With the old body, but the new battery, wet sump, lighter driver and WRD diff, the car was approximately 40# lighter than last time, and it was definitely a difference that could be felt in the car. However, it is also true that I was still fighting for straightline speed versus the other DSR’s and FB’s, meaning that some sort of weight or drag issue is still in play here.
  • Tires:With pretty warm weather on Saturday, I ran a set of scrubbed Goodyears from the practice day on Friday. At the end of the qualifying session and the race, the RR was missing its inner three wear bars, and the LF was missing the inner two. The tires remained consistent throughout the whole race, but they’d have been questionable to use for Sunday after such heavy wear. Perhaps this is a temp-coupled-with-driver
    issue? Chris loaned me a set of Hoosiers to use on Sunday, which I did all day. We spent Saturday evening getting the car reconfigured for the Hoosiers, which basically amounted to resetting the ride heights, and verifying that toe and camber were where they wanted to be. The only significant change was reducing front camber to a bit under 1*, rather than the 1.5ish I’d been running previously. For sure, it also pointed out that having a true, level repeatable setup pad is really a must-have for the future. No more of this damn guessing game stuff!
  • Temperatures:Ambient temperature was around 90* both days, making it warm, but not unbearable. I did notice in particular that the car was running much hotter oil temperature with the wet sump than it had previously with the dry sump. During the hottest parts of the race, oil T was about 270* measured in the main oil gallery, versus the 245* or so that it had run at PPIR during similar ambient temps with the dry sump. So, definitely score one for the dry sump in that regard.

Weight, Wait

A bit more from the weight-and-scales bucket, as I’m pulling parts off the car and comparing:

  • Dauntless wing + support: 16.8#
  • Stohr Wings + support: 20.4# (3.4# heavier)
  • Misc Brackets removed from the car: (body support, duct, etc): 19#

 

Humble Pie


Saturday Race Highlights


Sunday Race Highlights

It’s always great to be the big fish in a small pond…until you head over to a bigger pond and see just how big the big fish are!

Eager to run again after a six-week layoff, we made the (very easy) tow out to Miller Motorsports Park for the “Great Salt Race” R/R/N/N weekend.

In short, Miller is awesome. Go. The facility is beautiful, and despite the mid-August date, the weather was outstanding – mid/high 80’s the whole weekend, no wind at all. The facility is of course super-modern and very comfortable.

The schedule for this weekend had us running the “East Course” at Miller, which is the tighter, more technical half. On the West course was a motorcycle club, making for a very busy paddock – the whole place just felt alive with activity the whole weekend, as there was also a kart race going on on the north side of the facility as well.

From watching on TV, the track appears flat and relatively uninteresting, but from up close on track, every corner has some amount of camber change, radius change, or even a bit of elevation change to add some flavor. Some have curbs you can hit really hard, some have some pretty fearsome curbing you must try pretty hard to avoid. There’s at least one corner (Tooele Turn) that I never did even remotely to my satisfaction. Nice and complex, so really a fun driver’s track, and very difficult to master. This is definitely a track where the driver can make a big difference.

The DSR field was two WF-1’s (Chris Farrell, Sam Souval) and me, plus a gaggle of F1000’s for flavor. Needless to say I was nowhere near Chris on his home track – somewhere between 2 and 4 seconds a lap slower than he was, depending on tires etc. I wasn’t on pace with Sam and his WF-1 either, though Sam was sporting a nice healthy built motor that was impressively quick.

Friday we showed up to learn the track, and see how the car was going to go. Since June Sprints, a host of updates had been made to the car, including brand new valving in the
Penske 2000 shocks from Chris Billings at the Shock Shop. Chris reported that all four shocks had been valved differently, and that there was different weight oil in all four when he got them! In short, they were a disaster. He sent them back after working his magic, and the car is transformed. Floats over the curbs, incredible turn-in and power-down characteristics, no more porpoising over the bumps.

Also among the changes was a Williams differential to replace the factory Torsen, and a removal of the BRD dry sump system, in the name of weight reduction.

My only excitement Friday was getting a pair of donuts on the car from an inattentive FB, who moved over straight into me near a corner entry, painting my left sidepod with his right
front wheel. No real harm, just a scratch or two.

Saturday

Saturday’s race was good fun, though confusing. Sam Souval and I started next to eachother. I thought I might be able to sneak on his inside at the start, but of course Sam had too much experience here at Miller to allow that to happen. Chris had started from the back after having to change a blown engine, which I helped him change while he was heading back to SLC to get his spare motor. He passed me on about lap 4 or thereabouts. Sheesh.

About midrace, a pair of F1000’s passed me in the midst of a big battle. I thought initially that I must have been sleeping, with nobody around to run with, but the data shows that I was running more-or-less the same pace, so they must have been really thrashing it trying to get by eachother. It took me the rest of the race to catch them up, nearly passing David Palmer in his Stohr at the flag – coming just about 5′ short at the checkers. From the video, it’s certainly true that I missed some opportunities to pass him on the last lap that a better or more experienced driver would have been able to take. The end result was 2nd in DSR and 3rd overall, behind Chris and David in the FB. Sammy had a confusing race,
coming through the pits in response to a sound-board, and ending up third.

My analysis from watching the FB’s and Chris in the DSR is that I still seem to be down on straightaway speed to all the DSR/FB’s out there, despite having taken about 40# out of the car. All of my passes are either on the brakes or have to be of the “timed slingshot” variety that relies on cornerspeed, since all the motorcycle-engine cars are at least even or
better in a straight line. Hmm.

My big oopsie for the weekend was a pass under yellow into T1. In my defense (hah), the yellow had been kept out when there was no longer anything to worry about, so I guess it
had sorta been disregarded in my head, and I’d finally chased down the first of those FB’s. Not my proudest moment. I received a talking-to by the stewards, deservedly so. However,
since Sam had been DQ’d due to sound, confusingly, my finishing position ended up unchanged.

After the race, I took a look at my Goodyears, which were pretty well 100% toast. Right rear had no wear markers left on the inner 3 bars, and the LF was missing the inner two as well.
Chris let me borrow a set of new Hoosiers he had in the trailer, and we spent the next few hours re-aligning/weighting the car to work with the Hoosiers.

As compared to the Goodyears, the Hoosiers (R35) definitely don’t come up as fast – the first 1-2 laps are more sketchy than on the Goodyears. The Hoosier combo has relatively less
front-end grip than does the 20×9.5/22×10 Goodyear combo, which in my case was a benefit, since I’ve been continuously softening the back of the car and adding rear wing in the hunt
for rear-end grip since the 20×9.5’s went on . Ultimately, the more stable car was quite a bit faster for the driver – I cut about 1.5 seconds off of my previous best in Sunday’s qualifying.

Sunday

Sunday’s race was also exciting, with me starting 4th behind an FA, Chris, and JR Osborne in a Stohr F1000. Russ Werner, 5th on the grid in his Phoenix got an, uh, “unusually good start”, and was inside me by the time the green flew. He came into T1 a bit too hot, had some understeer and pushed me out into the gravel on the exit of T1, some of which was my decision just to make sure we didn’t tangle. I kept my foot mostly in it, and only dropped two spots. I spent the next few laps chasing down the F1000’s, passed them both, and then put my head down, trying to see if I could catch JRO, but he slowed early on with some sort of problem.

About half race, somebody spun into the gravel at T1, just after Sam had passed me from his start at the back, causing a full-course yellow, so we gathered up for a restart.
On the restart, an optimistic FE centerpunched Sam in his DSR, who collected another formula car of some kind as he spun, and I snuck through the gap. I made up enough time that Sam couldn’t catch me back up by the finish, though he made it to within about 100 yards. Chris won the race after the leading FA tangled with a backmarker and broke his RR toe link on the last lap. I ended up 3rd OA again, behind Chris and the FA, and 2nd in DSR.

Other misc from the weekend, I ran the car wet-sumped for the first time in about a year. Oil pressures remained high and stable, though oil temperature was approximately 30-40* higher for the same ambient temperature. Earlier in the year at PPIR, in 95* temps, the dry sump kept oil T to about 245 or so, and this weekend I was flirting with 270 for most of the race both days. (measured in main crank gallery). So, be it known that the dry sump absolutely does help with oil cooling. My hope is that the WF-1 bodywork and its more effective cooling will make that a nonissue.

As mentioned, the new shock setup from the Shock Shop was absolutely stellar, and the VoltPhreaks battery is a total nonissue (plenty of juice!), easy weight reduction there.

Next up, new bodywork and another 40# or so out of the car, so I’m hoping to really take a chunk out of the ol’ track record at HPR in a few weeks over labor day. ’tis always fun!


Sunday Best Qualy Lap

Thrash

Naturally, everything is getting a little bit exciting, now that we’re less than a week from leaving for Miller Motorsports Park, and I still haven’t set the car on the ground!

Here’s the latest:

  • Shocks: These are still at the Shock Shop, in the capable hands of Chris Billings. Not having done a set of Penske 2000’s before, it’s taking him longer than usual, but he’s
    really putting in the time and effort to get them really right. Very grateful for that. We’re scheduled to have those in my hands Tuesday afternoon, and I’ll reinstall them then. Initial discovery is that all four shocks were not even valved the same (gee, great). We’ve removed half of the internal spacer in the rear shock, to get the extended length back to the 14.5″ of a standard WF-1 rear shock, which will help with setting the car back up with standard rear droop travel. Finally, Hyperco perches will be going in (one at each corner) to help the shocks do their job. The net effect of all this should be substantial!
  • Bodywork:It’s here, it’s here, it’s here! A giant crate arrived at SCR Performance Wednesday, and I set about getting everything trimed and ground down as well as I was able to get it ready for Pat to work his magic on the paint. As I had hoped, the new bodywork is much, much lighter than my old stuff. Even after a verrrryyyy thin coat of paint, it seems that hardly any extra weight was added – at least not within the error of my scales, it would seem:
    Before After Paint
    Fenders: 11.2# 10.4#(?)
    Center: 15.6# 14.4#(?)
    Sidepods: 13.0# 13.0#
    Rear: 15.2# 18.4#
    TOTAL: 55.0# 56.2#

    That is now a bit lower as we trimmed a bit off of each piece, but also adding in are the louvers, which I didn’t weigh. We’ll see what everything comes out to after paint, and of course, I have to add the mirrors onto the centerbody.

    Also of note in the weight reduction category is that when the 1g body comes off, some decent bits like the rear fenders, large rear body support, and oil cooler duct will come off with it, which add up to another few pounds of weight. So, this way work out to a genuine 40# savings off of the car.

    Yet to be weighed is the Stohr rear wing assembly versus the Dauntless wing assembly, which I anticipate is substantially lighter than the Stohr pieces, unfortunately.

  • WRD Diff: Through a lucky circumstance, I found a used WRD differential for a good price. Lee Williams checked it over, and sent it off. It is now happily in the car, Lee
    having told me about the nifty suggestion of freezing the diff and heating the sideplates to allow them to be simply dropped in place – very cool. The only remaining tricks now are to find some circlips for the axle cups, a socket to tighten the “Big Nut”, and a solution for the speed sensor pickup. As it turns out, the diff is no lighter than the Torsen – maybe 2# or so.
  • Dry Sump: The BRD Dry sump and tank is off the car, and as well as it worked, is now for sale. The entire weight of the dry sump system (pan, pot, lines, etc) was 18.6#, not counting the approximately 2 extra quarts of oil that the dry sump takes. By contrast the wet sump pan is 3.8#, so plus a bit for the two lines, and you have approximately a 15# weight savings out of the car.