1998 BMW M Roadster vs. Chevrolet Corvette vs. Porsche Boxster

From the March 1998 problem of Automobile and Driver.

Previously 27 months, 5 new roadsters have been launched in the US. The sportiest of the 5 are the Porsche Boxster (which went on sale in January 1997), the BMW Z3 (which beat the Boxster to the showroom by a full yr), and the Chevrolet Corvette, which has been out there since final September. The 2 different roadsters, which aren’t included on this comparability check, are the Mercedes SLK230, launched in February 1996, and Mazda’s newest Miata, which needs to be broadly out there as you learn this. The soft-riding, automatic-only Benz is a luxurious cruiser first and is notably slower and fewer athletic than the three ruffians gathered right here, though they problem it almost greenback for greenback available in the market. The venerable Miata continues to be a pure roadster, however its skills are restricted by its reasonably powered motor, which contributes to its inexpensive $20,000 worth, half the value of these within the group we have gathered.

The Corvette, the Boxster, and the brand new more-powerful model of BMW’s Z3, known as the M roadster, are all-out, go-for-broke roadsters, the efficiency benchmarks. We voted the Corvette and the Boxster two of our 10Best Vehicles for 1998 (the M roadster was nonetheless within the field). On the newest Corvette, most of the particulars—lack of rattles, the clear gauges, and additional space for storing—are so effectively executed that you simply’d assume every of those roadsters was hand-built. Porsche’s Boxster shares the brand new 911’s entrance fenders and doorways and makes use of a 201-hp, 2.5-liter model of the watercooled flat-six engine within the new 296-hp, 3.4-liter 911 sequence. Can we like these automobiles? Does an owl hoot?

BMW will start promoting the M roadster in April. It is powered by the corporate’s strongest six-cylinder engine, additionally discovered within the M3 five-seat coupe and sedan. The engine swap required a completely retuned suspension and steering gear, transferring the battery from the proper aspect of the trunk to the middle to make room for a twin exhaust, filling the fenders with wider tires, and putting in 4 chunky tailpipes that exit in again.

All this further work takes place on the identical meeting line in Spartanburg, South Carolina, that builds your entire world’s provide of BMW roadsters. BMW’s famed M (for “motorsport”) division was answerable for the design and engineering and sends full 240-hp motors from Munich, Germany, to the upstate Carolinians for set up. The lower-powered Z3 fashions’ engines come from Austria.

The M roadster’s in-line six-cylinder is a rev-happy motor. It matches into the small chassis the way in which the Nice Scorching Rodder within the Sky meant, growing output from the Z3 2.8-liter’s 189 hp to 240 hp. These three roadsters value huge cash—$49,235 for the Corvette, $46,385 for the Boxster, and $43,245 for the M roadster as examined. Chevrolet predicts gross sales of upwards of 10,000 Corvette convertibles in 1998. Porsche hopes to promote 8000 Boxsters, and BMW figures 3500 of the 20,000 Z3s it makes for 1998 would be the M-roadster mannequin.

Publicity to the surroundings in our three check automobiles is as undiluted as in any convertible, however roadsters make no compromises for passengers behind the entrance seats. This egocentric seating association focuses the skills of the Corvette, the Boxster, and the M roadster on pleasing the driving force. Which one is the very best at it?

third Place: Chevrolet Corvette

We would drive the Corvette roadster about 40 p.c of the time with its high down. Chalk that as much as its inside spaciousness—there’s loads of room inside for wind to swirl round and provide you with a chill. Though the stereo quantity routinely rises with elevated pace, the driveline and the exhaust make sufficient noise that you simply typically must withdraw from driving on difficult roads and simply goal the automobile down a straight street, letting your senses quiet down.

The excellent news is the noises are good noises: Throaty, hot-rod-­model burbling and provocative “again pops” (simply quieter than a full-fledged backfire) from the exhaust make enjoying with the throttle enjoyable for the ears. Starting at about 2300 rpm below half throttle, the exhaust booms like a subwoofer.

HIGHS: Plentiful energy, balanced dealing with, and a trunk constructed for 3.
LOWS: You will need to get out of the automobile to decrease and lift the roof, and the automobile’s bulk makes it robust to maneuver in tiny private areas.
VERDICT: The fleetest of the pack, nevertheless it’s bigger and feels much less related to the street than the others.

Whining in regards to the racket is just not meant to subvert the Corvette’s expression of pace: Our check automobile acquired to 60 mph in simply over 5 seconds, which is a blink slower than the primary CS Corvette roadster we examined final October. It additionally climbed to 167 mph with the highest in place and 160 with the highest down. The Corvette roadster growls via the quarter-mile in 13.5 seconds at 107 mph. (Our final hardtop was simply two­-tenths of a second and a pair of mph faster.) That places the Vette a half-second forward of the BMW and 1.2 seconds in entrance of the Porsche.

The aluminum pushrod V-8 within the roadster makes 345 hp, however extra notable on this subject of roadsters is the engine’s 350 pound-feet of torque, which accelerates the automobile out of corners extremely rapidly, even at half throttle. You get a way there’s loads of energy in reserve right here. The six-speed guide transmission in our check automobile contains a sixth gear so tall that at 70 mph the engine turns over at a mere 1550 rpm. It additionally options the annoying fuel-saver skip-shift function that forces you to upshift from first to fourth gear when tooling alongside at half throttle at gradual metropolis speeds.

For our egocentric and fuel-consumptive back-road enterprise—performed on a few of the very tight 10Best Roads of the Southeast (C/D, January 1998)—we ignored the Corvette’s high three gears, saving them for freeway cruising. The Corvette launches rapidly from nook to nook on the roads which are essentially the most enjoyable to drive. It pulls so strongly you possibly can generally keep away from downshifting and nonetheless keep as a lot pace.

It feels balanced on the twisty roads and likewise in our dealing with and emergency-lane-change maneuvers. “The Corvette’s chassis deserves respect—it is totally predictable,” stated senior technical editor Don Schroeder. The Corvette has higher grip on the skidpad than the Porsche or BMW, and it out­runs each of them via the emergency-lane-change contest.

So why does the automobile that generates the very best numbers in so many classes end third? On this check, its bulk acquired in the way in which, detracting from the entire roadster driving expertise.

“The Corvette is simply too huge right here, in actuality or notion,” stated technical editor Larry Webster.

We held this comparability check in South Carolina and arrange a dealing with course on the quick and clean Laurens proving floor owned by Michelin North America. The quick monitor ought to have favored the {powerful} Corvette, however Mom Nature gave the very best time to the mid-­engined Porsche within the type of a traction­-limiting sprinkle of rain.

“On the monitor it feels huge and brutish, though quick, too,” stated Schroeder. “On the damp monitor, although, it might probably’t put energy down with out excessive oversteer—not just like the Porsche, which stays impartial. You discover, getting out of the opposite automobiles and into the Corvette, that it takes some time to get used to the majority.”

Some staffers could be inclined to buy the Corvette merely due to its sheer pace—no soft-top automobile that prices much less can run sooner. Others assume the Corvette’s roomy 14-cubic-foot trunk, spacious inside, and facilities make it your best option of the three for serving as each a weekday commuter and a weekend warrior.

However we felt that the Corvette was happier on a dry check monitor than it was on these very twisty again roads. Consequently, in the case of delivering the number of sensations that solely come from a topless automobile, the Corvette loses by a whisker to its smaller, tidier opponents.

1998 Chevrolet Corvette convertible
345-hp V-8, 6-speed guide, 3260 lb
Base/as-tested worth: $45,619/$49,235
C/D TEST RESULTS
60 mph: 5.1 sec
100 mph: 11.6 sec
1/4 mile: 13.5 sec @ 107 mph
120 mph: 16.8 sec
Braking, 70­–0 mph: 172 ft
Roadholding, 300-ft-dia skidpad: 0.90 g
C/D noticed gas economic system: 14 mpg

2nd Place: BMW M Roadster

We would drive the M roadster about 60 p.c of the time with its high down, for a number of compelling causes: The heated seats and the fairly draft-free cockpit imply you possibly can drive alfresco in winter, your view out of the BMW is huge and expansive, and the highest is electrically powered and lowers or rises in 10 seconds. Of the three automobiles on this group, that is the closest in really feel to a bike, and loads of that sensation is as a result of the doorways appear low. Your left shoulder is a number of inches above the beltline of the driving force’s door. The nook of your left eye picks up the feel of rapidly transferring pavement near the automobile, which brings house the sense of pace you get on this roadster.

HIGHS: Drivetrain-refinement perfection, fashionable upholstery wardrobe.
LOWS: The older-generation rear suspen­sion is not as flawless because the state-of-the-art M3 sedan’s, and also you want extra time to develop belief within the BMW roadster’s dealing with.
VERDICT: The traditional definition of a roadster.

And that sense of pace could be very actual. The M roadster bests its M3-sedan sibling to 60 mph by a tenth of a second, getting there in 5.4 seconds. That is approaching the acceleration of the Corvette, though the big-boy Chevy has 105 extra horsepower. The quarter-mile blows by in 14 seconds flat at 100 mph, 1 mph higher than the heavier M3 hardtop.

“This motor sings alongside at 7000 rpm with nary a vibration,” stated Webster. It is also a versatile powerplant. Within the conversion to the three.2-liter engine, BMW added a freer-breathing twin exhaust system that the M3 does not have but. Output stays at 240 hp and 236 pound-feet, however the torque curve is widened a bit. Add that to the lighter weight of the little roadster—3080 kilos in contrast with the M3’s 3248 kilos—and the general impact makes the M3 really feel slower. BMW admits the 4 exhaust pipes have been added principally for the macho look, however the subsequent technology of the M3 (due this summer season) will probably get the brand new exhaust system and an influence improve. The larger exhaust does not imply the automobile is noisier, nevertheless. At full throttle with the highest up, the M roadster is notably extra muffled than the 2 different roadsters. M roadsters destined for the U.S. have much less sound-deadening materials inside than do European-spec M roadsters, which have been on sale abroad for a yr.

The M roadster will get lower-profile entrance tires and wider rear tires than the Z3 2.8 we examined in our earlier roadster comparability in April 1997, nevertheless it retains the identical measurement fenders because the Z3 2.8. Tuning the suspension for these tires required totally different spring charges and stiffer shock settings, however the purpose of this tuning wasn’t to make the automobile faster on a racetrack, however extra civilized round city. It is really snug and straightforward to drive four-fifths of the way in which to its limits. Suspension bits begin transferring round an terrible lot when the going will get faster. In contrast with the 2 different roadsters, the BMW displays essentially the most physique roll, squat, and dive. On some tight corners, you possibly can carry the within entrance wheel off the bottom a number of inches.

“It’s a must to be completely exact and clean via the lane change, or this factor slides round and is gradual. Manner twitchier than the Porsche,” stated Webster. “It is the least composed of the three roadsters on the damp monitor,” stated Schroeder. “Steering requires frequent correction, and you could compensate for weight transfers.” What he means is that lovers of the older-generation Porsche 911 who favored driving sideways can reminisce on this BMW.

The BMW’s leather-based seating surfaces and fabric are superbly color-contrasted, and the gauges get chrome bezels. Inside, this automobile is essentially the most engaging of the three on this check. Outdoors, brake scoops change the fog lights in entrance, and the rear license plate strikes up from the bumper to the trunklid. We prefer it rather a lot. The Corvette prices $6000 extra as examined, and it boasts a string of kit unavailable on the BMW, equivalent to twin local weather controls, run-flat tires with integral pressure-sensor gauges, an influence antenna, further 12-volt retailers, a compact­-disc changer, reminiscence seats, and extra. Those that have come to count on all of this on a luxury-priced two-seater will miss it on the BMW.

1998 BMW M Roadster
240-hp inline-6, 5-speed guide, 3080 lb
Base/as-tested worth: $43,245/$43,245
C/D TEST RESULTS
60 mph: 5.4 sec
100 mph: 13.9 sec
1/4 mile: 14.0 sec @ 100 mph
120 mph: 22.2 sec
Braking, 70­–0 mph: 172 ft
Roadholding, 300-ft-dia skidpad: 0.88 g
C/D noticed gas economic system: 17 mpg

1st Place: Porsche Boxster

Not solely would we take this automobile to the ski mountains in January with the highest down, however we would need to drive ourselves to think about the draw back of the newest flu earlier than we would put the highest up, even when it rains in the summertime. Meaning we would need to drive this automobile topless about 80 p.c of the time we spent in it. Possibly we’re dreaming, however simply in case, we would pack one of many Boxster’ two spacious trunks with further jackets for the passenger. It is not uncomfortable in wintertime (at the least, a South Carolina winter) and we’re not exaggerating right here: The Boxster’s excessive beltline means your shoulders experience stage with the tops of the doorways, so when the aspect home windows are up, they block loads of wind. Perforated panels masking the insides of the roll hoops and a plexiglass barrier between the seats additionally preserve the air calm manner down into the footwells of the automobile. All of this aids the heater’s means with the highest off. The Boxster is essentially the most intimate-­feeling of those three roadsters.

HIGHS: The intuitive communication via the controls to the driving force creates the magic of true partnership.
LOWS: Weak motor means it is a dance accomplice not into full-tilt boogie.
VERDICT: Though many will purchase this new Porsche for present, its extra secret skills blossom in non-public on small, intimate roads.

Profitable top-down local weather administration is only one purpose the Porsche is an efficient roadster. Agility, involvement, suggestions, steadiness, sensitivity, consolation, and refined conduct in quite a lot of situations are the others.

At first, the Boxster feels much less {powerful} than the 2 different roadsters right here. It runs the quarter-mile greater than a second behind the Corvette (at 14.7 seconds). Its 7.3-second rolling-start acceleration from 5 to 60 mph feels positively sluggish after you have pushed the 2 different screamers, each of which handle the duty in lower than six seconds.

Prime pace is ungoverned at 146 mph—that is about as quick as a V-8 Mustang. At that pace, the Boxster feels secure and does not get blown round by sidewinds. In fact, the rocket Corvette goes 21 mph sooner.

When you’re indulging in different full­-throttle conduct, the Porsche feels quiet and assured. The 2 different roadsters appear to yell and shout. The Boxster is quieter than the others when cruising with the highest up, and relying on how excessive you maintain your head, it is an entire lot quieter when the highest is down.

Roadholding means is lower than the 2 different roadsters’ at 0.86 g, and the Porsche was at the least 3 mph slower than the others within the lane-change check. But the Boxster managed to run this check with out leaving a mark on the asphalt. The primary time via our cone-marked course, the BMW left lengthy, extensive, darkish tire smears of cooked rubber—4 of them. The Corvette, too, autographed the pavement and made screeching and wailing noises at its restrict. The Porsche remained unruffled and unprovoked.

Out on actual roads the Boxster proves its mettle. Whereas churning the steering wheels of all three automobiles back-to-back on no fewer than six of the roads we divulged in January because the 10Best Roads of the Southeast, the Porsche by no means fell behind, regardless of the large distinction in accel­eration occasions.

“All the pieces is so direct, fast, and quick on this automobile—the chassis, the steering response, the roll management. It appears like essentially the most nimble automobile right here, which makes up for the dearth of horsepower a bit,” justified Schroeder.

“I believe the M roadster is extra enjoyable, however the Boxster is fairly rattling enjoyable with out scaring you. It is a robust name which is best,” concluded Webster.

It might be a troublesome name, nevertheless it’s one we have made twice now. In our comparability check final April, the Boxster earned nearly precisely the identical rankings that it obtained throughout this check, regardless that the assessments occurred 2800 miles and 11 months aside. The scores for the early check’s Z3 2.8 and SLK230 have been decrease than these earned by this check’s Corvette and M roadster, which inform us these two newest roadsters are nearer to our excellent. And our conclusion, as soon as once more, is that this Porsche is much less handicapped by its reasonably powered engine than you’d assume. We won’t look forward to the arrival of the rumored 250-hp Boxster S mannequin this summer season, with energy sufficient for the really impatient.

1998 Porsche Boxster
201-hp flat-6, 5-speed guide, 2900 lbs
Base/as-tested worth: $40,077/$46,385
C/D TEST RESULTS
60 mph: 6.1 sec
100 mph: 16.8 sec
1/4 mile: 14.7 sec @ 94 mph
120 mph: 27.6 sec
Braking, 70­-0 mph: 164 ft
Roadholding, 300-ft-dia skidpad: 0.86 g
C/D noticed gas economic system: 17 mpg