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  • G8 at Sonoma Raceway!

    Posted on February 10th, 2013 tcorzett No comments

    Last April I had the chance to take the G8 out on-track at Laguna Seca Raceway. While it was lots of fun, the event ended early on a sour note when my engine started making disturbing noises. Shortly after the rebuild I headed-out on my 2012 GONE Road Trip, so have not had a chance to return to the race track in nearly a year!

    Determined to return to the track, I’ve spent the winter trying to organize a group of G8 and GTO owners who want to participate in track day events. My goal is to help facilitate the process for those who have never done it before, so have spent many hours checking calendars and putting together guides/checklists. After careful deliberation I decided that I would attend a two day track day event with the Northern California region of the National Auto Sport Association (NASA) at Sonoma Raceway (aka. Sears Point).

    In Northern California NASA is one of the largest groups of driving/racing enthusiasts and typically have a weekend event every month at the various tracks. Most event include both High Performance Driver Education (HPDE) events as well as full-out racers. The HPDE drivers are broken down into four groups based on experience:

    • HPDE-1: Novice – Instructor assigned, passing on main straights only
    • HPDE-2: Solo – Runs with HPDE-1, passing on main straights only
    • HPDE-3: Intermediate – Passing areas more liberal and increasing as day progresses
    • HPDE-4: Advanced – Open passing

    Sonoma Raceway (previously known as Infineon Raceway and Sears Point Raceway) is a tricky track. While there isn’t anything as extreme as “The Corkscrew”, the track is not a bunch of individual corners connected by straights… rather every corner flows into another. Making a mistake on the entry to one corner results in a cascade of problems through half the track. When you do things right you can really feel the rhythm of the track, and that’s extremely addicting!

    Having never driven with NASA, or at Sonoma Raceway, I decided to take things slow and run in HPDE-2. I’m sure I would qualify for HPDE-3, but didn’t want to overstep my abilities and make a bad first impression. It also gave me a chance to help the new HPDE-1 drivers who had never been to a track day event before.

    The week before the event I took the G8 into Synergy Motorsports for routine service (oil change, etc.) and a thorough once-over to make sure everything was ready for the track. After a year (and ~15k miles) I also had the brake fluid replaced (with more Castrol SRF)… the brake pads still had 50% of the material remaining. I also had replacement OEM front LCAs installed (I had reinstalled the original ones after reports of failures with the aftermarket ones).

    Given the event was both Saturday and Sunday, I decided to get a hotel close to the track so I could avoid the hour-long drive to/from the track each day… with the gates opening at 6am I figured the little extra sleep would be nice. It was also fun sleeping in a room with posters of Ferrari’s on the wall and a track map above the bed!

    I took Friday off so I could prepare for the weekend event. I took advantage of a gorgeous “winter” day in California to wash the G8 before heading-up to the hotel. Most of the day I had a nervous feeling in my stomach, but I knew it was just anticipation.

    Day #1
    Compared to my previous track day, NASA was definitely “strict” when it came to the rules. This isn’t a bad thing, especially since there were quite a few people who had never driven on-track before. After taking some time discuss basic information they went over flags then broke-down into the various HPDE groups for more in-depth discussions before getting out on-track.

    During the first 20 minute session of the day I started near the back of the HPDE-2 drivers, but in front of the HPDE-1 group. One of the nice parts of NASA events is that while HPDE-1 and 2 are limited to passing on the main straights, no point-bys are required. While this resulted in some sketchy passes by impatient drivers, I found it nice to feel like I wasn’t ever holding-up people.

    After letting one person by I had nearly the entire session to work on learning the driving line. I’d spent quite some time reading track guides and practicing in video games, but there is nothing that can replace the experience of driving around a corner. While I’m sure my line was far from ideal, I felt I was starting to develop a good sense for where I needed to be.

    Towards the end of the first session the flag stations started to display a black flag (“Black Flag All”) meaning we were to proceed (with caution) around the track and return to the pit lane. As I rounded Turn 7 I spotted a standing yellow flag and a white flag (slow moving vehicle on-track). As I entered Turn 8 I could see a vehicle sitting off-track at the apex of Turn 8a, but it appeared to have damage on the driver’s side door. I kept thinking to myself, “How did you do that there? There’s nothing to hit…”. Then I spotted a Porsche with front-end damage hiding behind a safety truck.

    After each HPDE session on-track NASA has a group “download” session where we discuss things. Needless to say there was quite a lot of discussion about the car-to-car incident (which is nearly unheard of). It was obvious to me that people were driving too fast/close for their ability, especially for the first session (of the first event of the year). It was a bit surprising to hear the instructors comments about who was “at fault” in the incident… and that as a driver you are responsible for being able to control/stop your car if/when the vehicle ahead of you has an issue (like a spin).

    There wasn’t much time after the debrief before we were back out on track for the second session of the day. I again tried to position myself towards the end of the HPDE-2 group, giving myself lots of room to work on learning the track.

    Like I did in the driving schools I decided to keep in 4th gear and just focus on the line. I found that I was picking-up things fairly quickly, but knew I wasn’t pushing too hard. While I started going WOT on the straights, I tried to be consistent with my braking/turning points. Just when I was getting in the groove the session came to an end.

    At lunch NASA runs a session called a “Hyperdrive”. This is designed to give people a taste of track driving without all the requirements of a full HPDE-1 run group. Many people would consider a 45 minute track session at a maximum speed of 35mph torture, but with no previous experience/instruction at Sonoma Raceway I took this as the perfect time to really learn the driving line with one-on-one instruction. Unfortunately the debrief from the second session ran long, so I missed half of the Hyperdrive, but I came away from it with a much better understanding of the track. I would highly recommend it for anyone really looking to learn to drive a new track.

    Before the third session I needed to fill-up my tank with fuel. With the G8 tuned to run on 91 octane pump gas there isn’t a need for race gas, but during long sessions engine/intake temperatures can get high. Running higher octane fuel is cheap insurance to protect against detonation (or the ECM pulling timing due to knock). After 12.424 gallons of 96 octane (at $7.999 per gallon) the final “blend” in the tank was 94.8 octane… perfect for an afternoon of track driving!

    In the third session I planned to apply what I’d learned during the Hyperdrive and really work on driving the proper line. I came up-to-speed more quickly and soon found myself starting to push things harder down the straights and through the corners.

    Just when I was starting to get a feel for the track I entered Turn 10 something went wrong…

    As I looked into my rear-view mirror to check on the car I was going to let pass me I noticed a bunch of smoke coming out the rear of my car. At first I thought I might have lost traction somehow, but I wasn’t on the gas. Fortunately the entrance to pit lane was just to the left, so I quickly exited the track.

    In the paddock I checked the G8’s vitals. Oil pressure and temperatures both looked good, oil level was good. Unlike last time I had issues on-track there were no strange noises. The engine seemed to be OK, but I wanted to find a cause for the smoke. I remembered that I hadn’t checked my catch can prior to the event… and sure enough there was quite a bit of oil in there. At that point I figured I’d found the problem (some oil had been picked-up from the catch can and been sent into the intake, resulting in smoke). In hindsight I really should have crawled under the rear of the G8, as I would have noticed that hadn’t been the case.

    Despite thinking I’d fixed the reason for the smoke, I didn’t want to push things and drive in the fourth session for the day. I took a trip out on the ring road to see if I could see any more smoke and to double-check that everything was behaving. I wasn’t experiencing any issues, so after watching the Group C race I headed back to the hotel for the night.

    Day #2
    Yesterday was an exciting day, but after the mechanical issues from Session 3 I was apprehensive about how the day would go. I’d driven to/from the hotel without issue, but I wanted to take things slow on-track so arranged to be one of the last cars out for the first session.

    I started out of the pits and everything seemed to be OK. I made my way around the track on the opening warm-up lap slowly increasing the speeds, but just as I started around Turn 10 I knew something in the drive-line was not right.

    As I tried to accelerate out of the corner I could hear the engine RPMs increasing, but there was zero power going to the rear wheels. I had another car on my bumper, so quickly dove into the pit lane while I tried to find a gear that would work. After trying a few different gears with no luck, I knew my weekend was over. I coasted into the paddock and quickly located an empty area to park. I pulled-off my helmet and crawled under the back of the G8 to figure out what had happened.

    At this point I could clearly see it was something major that caused the smoke yesterday, not just a little excess oil from the catch can. Fortunately one of the steps I’ve taken in preparation for track driving is upgrading to a Platinum AAA membership which includes up to 200 miles of towing per incident.

    It didn’t take long for the tow truck to arrive and get the G8 loaded-up. After swinging by my spot in the paddock to pick-up all my stuff (tools, bags, spare tire, etc.) we headed-off towards my mechanic’s shop.

    Getting the G8 up on a lift, it’s was obvious there is something wrong with the rear differential.

    The driver’s side axle had separated from the differential and that allowed fluid to drip onto the exhaust (causing the smoke observed on-track). Fortunately it appears there was no damage caused to the axles or the differential and after flushing the fluid everything went back together and seems to be driving fine.

    Overall it was a fun weekend. It was great to drive at Sonoma Raceway with NASA and I was glad I could help some friends get out on track for the first time. While I would love to get back out on-track soon, finishing on a tow truck wasn’t how I imagined it ending. I said after my previous track day, I really think I need to look into a dedicated track car!