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AD&P; > November 2015 > NOTABLE 14 In addition to which, the spark timing can be advanced closer to the optimal value. The risk of knock is minimized. What's more, the cooler operation means there are reduced thermal stresses on components ranging from the pistons to the exhaust valves to the turbocharger to the catalytic converter. There are three water injectors used. Each injector supplies water to two cylinders. There is a 1.3-gallon water tank in the trunk. The water pump used supplies water to the injectors at approximately 145 psi, with the injection quantity based on load, engine speed, and temperature. There are sensors and actuators as part of this injection system and the control is provided by the engine management system. BMW engineers anticipate that the water tank wouldn't need reflling much more often than at every ffth refueling for everyday driving conditions—although they do point out that if the M4 GTS is running on a track (it ran a lap time of 7 minutes 28 seconds around the Nürburgring-Nordschleife), it might need to get reflled with water every time it is reflled with gasoline. If the tank runs dry? Boost pressure and spark timing are adjusted as necessary to protect the engine. Incidentally: BMW acknowledges this as a special- edition car. Only 700 are going to be manufactured, of which 300 are slated for the U.S. market. (Chances are by the time you read this, all 700 will be gone.) p In addition to its clever powertrain setup, the M4 GTS is a study in lightweighting through the extensive use of carbon fber reinforced plastic (CFRP). For example, the hood, roof (said to be 25% lighter than the aluminum roof on the standard M4), and decklid are CFRP. The CFRP spoiler is mounted on CNC-machined aluminum struts. Even the driveshaft is CFRP. KOMET engineers and manufactures tools in the U.S. Boring. Reaming. Threading. Milling. IT'S NOT ALL ABOUT THE WORKPIECE It's also about the tool. Our boring tools achieve outstanding performance, bore after bore, because they are made to handle the most challenging situations. THE CUTTING EDGE by KOMET – technology-driven performance. KOMET KUB Centron ® Powerline. Drilling depths up to 9xD. Diameter range 20 – 65 mm. Equipped with proven SOEX inserts. K O M E T e n g i n e e r s a n d m a n u f a c t u r e s t o o l s i n t h e U . S . B o r i n g . R e a m i n g . T h r e a d i n g . M i l l i n g . I T ' S N O T A L L A B O U T T H E W O R K P I E C E I t ' s a l s o a b o u t t h e t o o l . O u r b o r i n g t o o l s a c h i e v e o u t s t a n d i n g p e r f o r m a n c e , b o r e a f t e r b o r e , b e c a u s e t h e y a r e m a d e t o h a n d l e t h e m o s t c h a l l e n g i n g s i t u a t i o n s . T H E C U T T I N G E D G E b y K O M E T – t e c h n o l o g y - d r i v e n p e r f o r m a n c e . K O M E T K U B C e n t r o n ® P o w e r l i n e . D r i l l i n g d e p t h s u p t o 9 x D . D i a m e t e r r a n g e 2 0 – 6 5 m m . E q u i p p e d w i t h p r o v e n S O E X i n s e r t s .