[Editor’s Note: This article originally appeared in the October 2015 issue of Grassroots Motorsports. Some information and prices may have changed.]
The Miata is again.
Okay, high-quality, Mazda insists on calling it the MX-5, however that authentic roadster spirit has returned. Don’t fear: Progress and expertise haven’t sullied this newest iteration of the two-seat basic.
Time for a Face-Off
What else did the engineers go away on the desk after they went again to the unique Miata’s weight class? Does a step again in spec imply much less efficiency? These are the varieties of questions we are likely to ask; to get the solutions, a shootout was so as.
The face-off would go down on Tire Rack’s personal check observe, situated mere ft away from their company headquarters in South Bend, Indiana.
For the benchmark, we admit that we barely stacked the deck. We might have discovered a pleasant, clear, inventory NC-chassis MX-5, however we went with a recognized, confirmed amount: Chris Harvey’s nationally aggressive automotive. As an added bonus, Chris serves as Tire Rack’s brakes and suspension model supervisor. To say he has a number of laps at that facility can be an understatement.
His MX-5 is a 2009 Touring mannequin with the optionally available Sport Suspension–and that suspension package deal consists of the all-important limited-slip differential. “The 2006-’08 automobiles have a decrease redline, which restricts your pace in second gear,” he explains. “All 2009 and 2010 fashions got the next redline, which make 58-58.5 mph doable in second gear on 225/45R17 tires.
“The 2009 Sport mannequin was solely out there with 6.5-inch wheels and no LSD choice, so the mid-level Touring mannequin grew to become the ‘go-to’ with its 7-inch-wide wheels and choice field for the Sport Suspension: Bilsteins plus limited-slip.” Going newer than 2009, Chris provides, simply provides value.
How aggressive is “aggressive”? Finally yr’s Tire Rack SCCA Solo Nationals, co-driver Chris Fenter completed second within the C Road class whereas the automotive proprietor took fourth. Since then the successful Nissan 370Z has been bumped up a gaggle, whereas Chris and Chris’s 2015 season has included wins on the SCCA Spring Nationals and Wilmington, Ohio, ProSolo.
SCCA Road guidelines don’t permit too many modifications, with the biggies restricted to only tires, exhaust and shock absorbers. Whereas these guidelines have been initially supposed to permit off-the-shelf replacements when O.E. items couldn’t be discovered, immediately’s prime Road-category autocrossers know to totally make the most of them.
The Harvey MX-5 runs Penske 8300-series double-adjustable, remote-reservoir, monotube dampers custom-valved by Chris Fenter. “Customized spring perches [are] matched to O.E. specs to fulfill SCCA rule necessities,” Chris Harvey explains.
“Being able to dial up the low-speed compression and rebound management is essential in transition with a automotive as softly sprung because the inventory MX-5,” Harvey continues. “Off the shelf Koni Sport shocks have been an enormous step ahead over O.E. dampers and possibly ship 90 p.c of the advance out there with the Penske setup.
“What the Penskes gave us was a bigger vary of adjustment for each observe and street driving–we drive the automotive to all of the occasions–in addition to extra flexibility of the interior shock valving that permits the automotive to soak up sharp-edged bumps extra readily on the restrict. On a easy observe, just like the Tire Rack check website, the efficiency benefit of the Penske is smaller. On a floor just like the SCCA Solo Nationals website in Lincoln, the place we’ve some reasonable floor top modifications to cope with, the benefit of the Penske probably will increase.”
How a lot wouldn’t it value to place the same setup in your MX-5, together with the SCCA-legal perches? Determine $4000 to $5000. Sure, severe enterprise.
To take full benefit of the principles, Chris additionally runs a 7-pound Goodwin Racing exhaust system, light-weight Kosei K1-TS wheels, and a minimal gasoline load.
The Challenger
Just like the earlier MX-5, the brand new one will are available a number of totally different flavors: base, sporty and comfortable. The zippiest variant, no less than initially, would be the Membership mannequin.
The MX-5 Membership doesn’t get any further horsepower, however Bilstein dampers and a limited-slip differential come customary–and that is the one approach to get these items on a brand new MX-5 from the manufacturing facility, we must always add. The Membership additionally will get a shock tower brace, air dam, trunk spoiler and 17-inch alloy wheels. If that’s not fairly sufficient for you, an optionally available package deal provides 17-inch solid BBS wheels and Brembo entrance brakes.
The Membership with the optionally available BBS package deal is the precise automotive we had lined up for our little check. What we acquired courtesy of a clerical error, nonetheless, was a Grand Touring mannequin: no restricted slip and no sporty dampers. As a substitute we had a nine-speaker Bose sound system, blind-spot monitoring system, leather-trimmed inside and computerized headlights. As a comfort, we nonetheless bought 17-inch wheels as a substitute of the 16s discovered on the bottom automotive. Our automotive additionally had the usual six-speed handbook transmission, not the optionally available computerized. Nonetheless, it was a fairly stacked deck for our check.
To take away maybe the most important variable, each automobiles have been handled to contemporary footwear: 225/45R17 BFGoodrich g-Pressure Rival S tires, a number of the prime rubber in immediately’s Road-category wars. As our personal testing has proven, the Rival S is a quick, constant tire.
On the ND, these tires have been wrapped round 17×7-inch TRMotorsports FF10 wheels. Their 38mm offset takes benefit of the Road-category allowances, whereas their 14.5-pound weight makes them solely a tenth of a pound lighter than the Koseis fitted to the NC.
We additionally handled the brand new MX-5 to a contest suspension alignment. Whereas our restricted time with the automotive didn’t permit us to develop the optimum suspension setup, Woody Rogers, Tire Rack’s product info specialist and a nationally aggressive autocrosser as nicely, had Veldman’s Service Heart comply with a confirmed method: zero toe throughout and most destructive entrance camber, which turned out to be about 1.2 levels . Rear destructive camber was set at 2.1 levels; Chris says that front-to-rear camber stagger has labored nicely on Miatas up to now.. (For comparability, Chris additionally runs zero toe, however can get extra destructive camber: 1.8 levels on the entrance tires and a couple of.5 on the rears.)
The Outcomes
Okay, sufficient speaking. Time to document some lap instances.
We used two drivers for this check, as Chris and Woody shared driving duties. Each have near a zillion laps at their facility. Woody additionally ran the entire information utilizing a Race Know-how DL1 information logger.
After a number of laps to take away any mould launch agent from the brand new tires, the timers have been began. Every driver would get two autocross-style runs in every automotive.
You’ll be able to analyze our information nonetheless you’d like, however the outcomes are fairly clear: The brand new MX-5 dominated. The ND persistently posted the higher numbers for sooner laps, greater g-loads, and faster instances almost in every single place on target. Chris averaged laps of 57.720 seconds within the new automotive versus a median of 57.855 seconds within the outgoing mannequin. Woody posted larger good points for the forthcoming automotive: 59.040 seconds within the NC and 58.78 seconds within the ND.
“One overriding takeaway from this was precisely what Mazda is saying of their new MX-5 business: driving issues,” Woody says. “And for anybody who agrees, this automotive helps personify that message, whether or not you’re a hairdresser that toddles to and from work, the fanboi who goes for a rip, or a extra hardcore competitor like Chris or a International MX-5 Cup racer.”
Chis additionally heaped a lot reward upon the brand new automotive. “The GT package deal with inventory dampers, open diff and no Road-class weight optimization–muffler eliminated, low gasoline/fluids, and so on.–outperformed my absolutely prepped NC for each drivers!” Chris exclaims. “That’s fairly superb given the restricted camber out there, brief second gear and low break-in mileage on the automotive.”
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