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    Dinan Turbo #BMW #M6 #E24 ( turbo-engined #M635CSi #E24 #1988 ) The Annihilator. By Nicholas Bissoon-Dath.

    The needle races past 60 mph. The on-ramp ahead curves tightly away, but your right foot stays flat to the floor, the turbo-charged engine screaming with the hard- edged bass of a highly tuned six-cylinder in full cry. As the sign suggesting a ramp speed of 25 mph flashes past, you bend into the turn, and your passenger audibly pleads for divine protection. You feel the immense lateral loadings build as your speed rises, but the car clings to the road with no dramatics. As you merge onto the highway at more than 80 mph. you look over at the disbelieving face in the right seat. Welcome to the world of the Dinan Turbo BMW M6 E24.

    Company #AMG has the #Hammer , but #Dinan-Engineering has an equally formidable implement; think of it as the #E24-Annihilator . It blasts from 0 to 60 mph in 4.8 seconds, through the quarter-mile in 13.2 seconds at 107 mph, and on to a rev-limited top speed of 172. It offers race-car handling, #BMW quality and feel, and a shove in the back dial will get anyone’s attention.

    Steve Dinan is a 34-year-old mechanical engineer and the founder of Dinan Engineering (81 Pioneer Way, Mountain View, California 94041; 415-962-9417). He has spent the last nine years of his life servicing, racing, and tuning BMW's. The Turbo M6 is his star, and he has every reason to be proud of its brilliance.

    The source of the Dinan M6’s E24 prodigious performance is its modified turbo engine. Dinan Engineering retains the 24-valve M6 block and head, but that’s about all. It lowers the compression ratio from 9.8 to 7.7:1. A specially matched Garrett T04B turbocharger supplies the boost, which is limited by a Roto-Master waste gate to 13.0 psi. A huge HKS intercooler lowers the temperature of the intake charge; at 134 mph on a 70-degree day, according to Dinan, the reduction is a whopping 160 degrees. Dinan also installs a new airflow sensor and high-flow injectors and enlarges the stock air-cleaner inlet for better breathing. 4he final touch is a #Bosch-Motronic engine-control system, reprogrammed to Dinan’s specifications by Veloz Car Computers.

    The results are 390 horsepower at 6400 rpm —134 more hp than the standard M6 E24 — and a 7300 rpm redline. Not only is the power amazing, but it feeds in smoothly and progressively in response to the throttle. Press with your right foot and full boost is available just a moment later. The thrust builds at a furious pace, and before you know it you’re traveling at twice your previous speed. It’s easy to maintain high average speeds along remote secondary roads, picking off other cars as if multiple-jumping your way to victory in a game of checkers.

    Dinan has also seen to it that the M6’s superbly controllable brakes will haul you down from high speed as often as necessary. Metallic pads grab the stock rotors, and the front brakes are cooled by means of race-car-sized ducts feeding air from two gaping intakes in the front spoiler. The Turbo M6 #E24-Turbo stops from 70 mph in only 173 feet, ten feet shorter than the stock M6 can manage.

    Dinan’s racing experience is evident in his Stage 4 suspension. The $1938 package includes firmer shocks, stiffer springs, and adjustable anti-roll bars at both ends. Negative-camber plates in front and a special rear crossmember allow the normally fixed camber settings to be adjusted at all four wheels.

    The rolling stock consists of #Goodyear Eagle ZR S or #Yokohama A-008R tires on #BBS modular aluminum wheels. In front. 225/50ZR-16 rubber is mounted on 8.0- inch rims; the rear tires are 255/50ZR-16s on 9.0-inch wheels.

    Yes, #Steve-Dinan personally tunes the sus-pensions of his cars, and he achieves impressive results. We measured 0.91 g on our skidpad; that’s 0.04 g better than a #Z52 #Corvette with 275/40ZR-17 tires. In the real world, the #Dinan-Turbo-N16 will scythe through a series of switchbacks at an incredible pace. Charge into a comer at more than twice the posted limit and the car holds its line precisely. Once past your apex, the tail digs in as you press hard on the throttle and unwind the steering. You can blast through comer after corner in this fashion, in an unending stream of speed and tire squeal and fury, yet remain in complete control.

    At the limit the car understeers just enough to let you know that you’re about to run out of grip. The rear wheels can also be provoked loose by accelerating hard in a tight comer or by sharply backing off the throttle at the limit. When the rear does let go, however, it does so slowly and predictably.

    The price of this performance is a nice, round $20,000 — not including the $59,000 that an #M6-E24 will cost you. For your extra twenty grand you get the rocket engine, the Stage 4 suspension, the wheels and tires, the brake modifications, and a special Center forced clutch.

    You also get a few compromises. The #Dinan M6s ride is substantially stiffer than the production car’s, and the front tires tend to follow highway ruts. If you find such behaviour unacceptable, Dinan Engineering offers three other suspensions for 1970-and-later BMWs, each with its own level of control and complexity. It also sells turbo kits for both 5- and 6-series BMWs (means #E34 and #E24 ). Our test car didn’t have any smog controls, but Dinan builds emissions-certified turbo engines as well.

    We’ve driven Dinan BMWs equipped with both types and found that the cleansed car suffers little in feel. Dinan’s racetrack experience and development work have paid off. The Turbo #M6 s limits are so high, and its acceleration is so aggressive, that only the most exotic performance cars on the planet can compete with it. This is a civilized race car for the street. Drag racers, beware. And heaven help anybody w ho tries to keep up with the #Dinan-Turbo #BMW-M6-E24 on a winding road.

    Vehicle type: front-engine, rear-wheel-drive. 4-passenger 2-door sedan #BMW-E24 series

    1988 Price as tested: $80,000

    Engine type: turbocharged and intercooled 6-inline, iron Block and aluminium head, Veloz / ##Bosch-Motronlc electronic engine control system with port fuel injection.

    Displacement 211 cu in, 3453cc #S38 / #M88
    Power (SAE net) 390 bhp at 6400 rpm
    Transmission 5 speed
    Wheelbase 103.3 in
    Length 193.8 in
    Curb weight 3537 lb
    Zero to 60 mph 4.8 sec
    Zero to 100 mph 10.8 sec
    Standing ¼-mile 13.2 sec @ 107 mph
    Top speed 172 mph
    Braking 70-0 mph 173ft
    Road-holding, 300 ft dia skidpad 0.91g
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