Wrench, Weigh, Race... 2010 SCCA Dixie National Tour

By: Jake

It was 4:30am, I was covered in garage grime from head to toe, and had a meeting for work in less than four hours. I had never felt better! The car was reassembled and the off-season improvements were complete. As an "e-mechanic", this was the longest project in which I had ever entrenched myself. It was rewarding to say the least.

The ambitious goal for 2010 was to build my RX7 for Super Street Mod (SSM) class from it's current state as an ASP car. The rules are very flexible in SSM, but my imagination and innovation is limited. I ended up simply improving on what I had, not yet going for the pre-requisite upgraded turbos and/or motor swaps.

My off-season goal was three fold; 1) Lower under-hood tempertures to optimize the factory turbos, 2) Lower overall mass towards SSM minimum weight 2500lbs, 3) Make it grip.

To address the temperature issues the car got a new thermostat, larger intercooler, custom insulated intake & intercooler piping and ducting, heat-wrapped 3" downpipe & midpipe, and a new OE radiator fan.

The car diet started with the rear end. A used Greddy titanium catback exhaust, weighing only 7 lbs, replaced the heavier Racing Beat Dual tips, saving approximately 20 lbs. '93 RX7's twenty gallon fuel tanks have notoriously weak baffles and mine broke late last season. To fix this issue a '95+ spec fuel tank, which has reinforced and re-engineered baffling, was installed. This enables the car to be run below a quarter tank without fuel starvation issues. Net fuel weight savings of approximately 60 lbs. To counter all the rear end lightening - and make room for the aforementioned intercooler - the mini Deka battery was relocated from the engine bay to the hatch directly over the rear axles.

Next on the agenda, make it stick so hard that the asphalt rips out of the ground it was laid over. What better place to start than with the tires? Second hand rubber in the form of 295/35/17 Hoosier A6s were snagged up off a corvette owner for a song. These black donuts were shoe horned onto a set of 17x9" wheels that I had laying around. Final fitment was made possible by 0-60 Magazine, thanks to a borrowed fender-roller out of their project car garage, also know as "The Gayrage".

The final stages of the "grip" improvements came from a corner balancing compliments of my '09 National Championship co-driver, and fellow hamfist, Dave Corsaro. The night before leaving for the 2010 Dixie National Tour we put the car on scales at his workplace, Johnson Scale. Not famous for their automotive application, Johnson Scale handles general weighing, force measurement, material testing, and scale inspection, calibration, service and scale rentals. Perhaps they just found a new market niche. By midnight we had the car at a perfect 50:50 cross weight, however not without incident. We spent about 2 hours adjusting perches and deciphering nonsensical corresponding weight changes. It wasn't until Dave scratched his head and murmured with deep concern "I should have been taking better notes" that helping hand Elena discovered our major blunder. The left-rear and right-rear scales were placed at the right-rear and left-rear corners, respectively...

To be continued...

Jake - 59.XXX - Run 1 Day 2 Dixie National Tour (Spin)


Jake - 59.XXX - Run 3 Day 2 Dixie National Tour

1993 Mazda RX7 R1

Year: 1993
Make: Mazda
Model: RX-7 R1
Color: Vintage Red
Owner: Sandro
Sponsor: IRPerformance

Class Eligibility:
• SCCA SOLO - A Street Prepared
• SCCA Rallycross - She doesn't rally
• Redline Time Attack - Modified RWD
• NASA TT - TTS
• MotorsportsNE - Unlimited

Handling Modifications:
• 1" 1/4 ST Front Swaybar
• Mazdatrix adjustable Endlinks
• Widefoot front sway bar mounts
• Disconnected rear swaybar
• Tein SR Coilovers 14k Springs Front and Rear
• Mazdaspeed upgraded Suspension Bushings

Wheels & Tires:
• 15"x10" Diamond Racing
• 275/35/15 Hoosier A6

Braking Modifications:
• Hawk HP+ Pads
• Stainless Steel Brakelines

Power Modifications:
• Downpipe and Midpipe
• Apexi N1 dual exhaust
• Cheap Bastard Intake w/ Custom Insulation
• Custom I/C Fans
• Apexi PowerFC ECU
• Datalogit
• NKG Wideband O2 Sensor/meter
• RP Denso Fuel Pump
• Direct Power 12V Fuel Pump Wiring

Exterior Modifications:
• Baseball Bat Fender Roll
• Permanent Cone Marks

Interior Modifications:
• OMP Steering Wheel
• 4 Point Racing Harness
• Widefoot Pedal Extension
• Removed Radio and Speakers

Other Modifications & Maintenance:
• ATE Super Blue Racing Brakefluid
• Mazdaspeed Engine Mounts
• Mazdaspeed Aluminum Shifter Bushing
• Pettit Differential Bushings
• OS Giken LSD
• A/C Delete
• Air Pump Delete

Video: RX-7 Autox Shoot Off @ Raceway Park

Jake's run: 54.293 sec
Best Run: 52.939 sec (in Subaru STi)


Elena's run: 55.9XX sec
Best Run: 54.904 sec


Sandro's run: 56.294 sec
Best Run: 54.761 sec

Click here to view final results
Click here to view pax results

Note: Due to the fact that NNJR drivers power through courses so hard that the asphalt rips out of the ground, several midday course changes were made. The event results are therefore no longer being counted towards season points... Too bad considering I ran top pax in the Subaru on what I thought was the slower of the course designs for the day.

PREPARATION-H.amfist

By: Jake

SCCA DC ProSolo is in less than two weeks and Finger Lakes National Tour is this week. For many, Team Hamfist included, preparation is in full swing – preparation of equipment and preparation of drivers. Aside from making sure we get seat time every chance we get, including this weekend's NNJR SCCA autocross on the Raceway Park road course and last weekends 2-day Holbert Memorial, we have all begun working on some minor tweaks to get the cars closer to the maximum performance potential of each of our classes.

I am not about to let those STU boys get the best of me. For me personally, that meant spending a little time wrenching and a little time running erands. Neither of which was uneventful.

The STU Competition

A week or so ago myself and a couple other Hamfists decided to pull the trigger on new rubber. Between all of us we ended up buying twelve new tires; including, 4 Dunlop Direzza Z1 Star Specs, 4 Toyo R888s, and 4 Hoosier A6s… drool. The Hoosier A6’s are 275/35/15 and are set to be run on the La Rosa’s 1993 Mazda RX7 R1 – an ex-Super-Stock car now nicely prepared for ASP competition.

Awaiting fresh stickies (Top Right: La Rosa Rx-7; Top Left: Jake Rx-7; Bottom: Jake STi)

The R888 rubber, while sticky and technically and R compound tire, is more of a compromise between street and race. This rubber has been mounted to an A-Stock 2008 Honda S2000 Club Racing Edition owned by Hamfist co-founder, Dave Corsaro. (There will be much more on both of these autox beasts-drivers and cars-in future posts here so be sure to check back.)

Holbert Memorial Autox (Top Left: Jake STi; Top Right: Corsaro S2000)

Co-founder Dave performing the official Hamfist salute

The Dunlop’s are for the Subaru STi. Dunlop Direzzas are one of the fastest tires available for ST* competition in SCCA solo racing. Despite the Bridgestone RE11R being the tire of choice for most of my divisional and regional competition I decided to stick with a tried and true tire. This decision unfortunately eliminates me from contingency sponsor prize eligibility with Bridgestone, obviously. However, the upfront cost was a couple hundred dollars less buying the Dunlops than buying the Bridgestones.

Our Hamfist fieldtrip to Wal-Mart for a low buck race tire mount ($3.50/tire) yielded some funny pictures. One of which is the Bronco full of wheels and tires, sixteen to be exact.

And a business was born... Acme Tire Transport Co.

I guess that old hunk of steel serves a purpose after all. The other interesting thing to note was the car-nage that occurred right before our eyes upon pulling into the Wal-Mart parking lot. A Honda Accord came barreling out if its parking spot over a mulch median and plowed into the side of a shiny Civic parked 30 feet away. I thought that the throttle might have gotten stuck on the Accord, that was until the Accord backed up 10 feet and threw the car back in drive for another crunch session. Repeat. This guy was obviously nuts!

Wal-Mart carnage aftermath

We hamfisted the Bronco out of there in fear of being the next target on this guy’s rampage. Once the heat died down we check back with the scene of the crime and snapped pictures of some of the aftermath. Apparently the driver had a stroke and was clueless as to the carnage he was causing. He ended up in a telephone poll separating the parking lot from the major road. Lucky he didn’t cross over.

Back at Wal-Mart the tire mounting grease monkey decided to hook me up with a custom "polished lip" on one of my Rota DPT bronze wheels. What do you expect for $3.50 per tire? Team Hamfist is sitting on fresh rubber, now.

(Picture soon to come)

After the Holbert weekend and NNJR autox passed I started looking around at some parts I have accumulated over many months that I have yet to install due to a severe case of procrastination.

More Holbert Memorial Photo's by Perry @ Autox4u.com (2nd Place in class trophy: Bottom; Running: Top)

These parts include NGK iridium spark plugs, COBB shifter bushing, and a COBB post-MAF intake hose, and a custom Meineke axle-back-delete dump pipe.

Custom Meineke Dump Pipe

Additionally I have been piecing together some stock parts that have broken or fallen off, possibly as a result of rallyx, including a turbo heat shield bracket and a front passenger side fender liner. Most of this gear went in without a problem. However, while swapping the spark plugs I needed to remove the airbox; at which time I discovered that my K&N panel air filter was 95% caked in rally mud. When I say caked I mean CAKED. It looked like I baked a cake out of mud on the dirty side of the filter.

Source of the mud pie - Poughkeepsie Sports Car Club Rallycross '08 (Photo By: Robert Plafta)

They only part of the filter that looked to be allowing air to pass through must have been no bigger than a Ritz cracker. I have been autoxing like this all season! I proceeded to wack the panel against the ground ten or so times and it was all clean... relatively speaking. In my last effort to shave every tenth off my time and every ounce off my car I removed my rally armor mudflaps and rear aero-skirts. Not only does all this cosmetic hardware weight critical ounces but I imagine that they protruded off the car sufficient enough to clip unnecessary cones.

Next on the agenda is a stop at Sunoco for 5 gallons of my favorite automotive beverage, GT100 octane, and then I am off to Finger Lakes. Team Hamfist, I'll see you there. In the meantime don't forgot the secret Hamfist mantra... "Balls To The Wall."