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This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-13-2026
This product was last offered at the strikethrough price on
06-13-2026
All vehicles will lose some degree of performance due to heat soak under the right operating conditions. Engine management systems constantly monitor operating conditions and modifying parameters based on sensor inputs. BMW integrated the intake air temp sensor in the MAF housing on models such as the E39 M5, and, being sandwiched behind a hot radiator and in some applications next to an even hotter valve cover, this is less than ideal for performance applications. Absorbing excess heat from its surroundings, the MAF can’t shed it fast enough, and the ECU reads an inaccurately high intake air temperature. Compensating for this false hot air measurement, the ECU pulls timing and runs a richer fuel mixture, resulting in a significant loss of torque.
What can you do? Locate an intake air temp sensor in a location where it can properly measure incoming air temps and where it's less prone to heat soak. Mounting the sensor further away from the heat source and isolating it from the MAF housing, it can both resist the effects of heat soak longer and respond to temperature changes more quickly. The result is you’ll experience reduced torque loss and more consistent power output when you’re pushing your engine hard.
The Turner engineering team was initially skeptical of the claimed performance benefits of this modification. They first set out validate the functionality and performance benefit of a temp sensor relocation. Replicating stop-and-go traffic heat soak in a 2001 540i was a simple task in a controlled environment - their dynometer. First the car was heat soaked to simulate being stuck in traffic or moving at low speeds by running the car four times on the dyno with the dyno's cooling fans disabled. The fans were then turned on for three more runs to observe the recovery rate once air flow was reintroduced. The test: following this procedure once with a stock IAT, and once with their relocation kit in place.
The result? Turner recovered 11lb-ft torque at 2500rpm through use of their relocation kit, with even greater recovery to be found for M5 owners. Here are the heat soak-related torque losses Turner experienced:
Stock IAT location:
18rwtq at 2500rpm
10rwtq at 3000rpm
9rwtq at 3700rpm
Turner IAT Relocation:
7rwtq at 2500rpm
5rwtq at 3000rpm
5rwtq at 3700rpm
**Click here for installation instructions**
The Turner engineering team designed a complete plug and play kit (unlike all other options on the market) that makes for quick, easy, and reversible installation. Weather-sealed connectors keep out the elements, while sheathed wiring offers a clean appearance underhood. With a harness nearly 3 feet long - the Turner IAT relocation kit offers flexibility in positioning, but not too long that you're left with unsightly excess wiring. Turner recommends positioning the sensor in a location away from engine heat, but still within the intake ducting to achieve accurate intake temp readings - such as the far side of the base of the airbox. Vehicles with cold air intakes with cone-style filters can even position the sensor in the end of the filter. Simply drill a hole in your (cool) location of choice and plug in the harness. More information including installation instructions and some good examples of sensor mounting locations can be found in our DIY PDF.
We include everything you need to relocate your IAT, just select your desired sensor brand below - Genuine BMW or original equipment Beru.
Also the perfect plug-n-play option for anyone looking to upgrade their intake to utilize an Alpha-N tune!
Note for vehicles with M62 engine: applicable to 1999 and up
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This product was last offered at the strikethrough price on
06-14-2026
This is an OEM INA Timing Chain Tensioner. Keeping pressure on the timing chain, this keeps the chain from slipping teeth and causing the timing to be off, potentially leading to engine damage.
OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GENIUS5 is an exceptional addition to our lineup boasting incredible power, top-notch performance, energy efficiency, and a compact design. The GENIUS5 is a versatile 6-volt and 12-volt charger, maintainer, and desulfator with a 5-amp rating. It's engineered for use with lead-acid batteries in automotive, marine, and deep-cycle applications, covering flooded, gel, AGM, maintenance-free variants, and even lithium-ion batteries.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GB40 is a compact lithium-ion battery jump starter pack capable of delivering 1,000 amps, allowing you to jump-start a dead battery within seconds. Equipped with patented safety technology, it ensures spark-proof connections and reverse polarity protection, making it user-friendly and safe for everyone. Not only does it serve as a powerful battery booster, but it also functions as a portable power source for charging USB devices such as smartphones and tablets. Designed to support vehicles like cars, boats, RVs, trucks, and more, it can handle gas engines up to 6 liters and diesel engines up to 3 liters.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
This is an OEM INA Idler Pulley, also known as the roller pulley or deflection pulley. The idler pulleys are known to be the primary sources for 'belt squealing'. The pulley is also encased in rubber which will crack over time. If left without service the rubber could fail completely, chucking the belt and leaving you stranded. Replacement is a very simple procedure and can be done anytime the fan is off the engine (belt replacement, water pump service, alternator replacement, etc). OEM replacement for BMW part # 11281720039 and 11281715630.
OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
ADJUSTING PULLEY 11281720039 OEM
This item fits the following BMWs:
BMW 7 Series - 750iL
BMW 8 Series - 850i/Ci/Csi
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The NOCO Boost X GBX75 is a portable lithium jump starter crafted for 12-volt batteries in vehicles with gasoline engines up to 8.5 liters and diesel engines up to 6.5 liters. This versatile tool is suitable for a wide array of vehicles, including cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, tractors, and more. Featuring an all-new design, the GBX75 offers extreme jump-starting power, ensuring robust engine starts with ease. With a rating of 2500 amps, this portable lithium car battery jump starter delivers maximum energy with each start. It's not just an upgrade; it's part of our new Extreme Series, delivering exceptional performance and reliability.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GENIUS10 is a powerhouse among our chargers known for its exceptional performance, energy efficiency, and compact design. The GENIUS10 is a versatile 6-volt and 12-volt charger, maintainer, and desulfator with a robust 10-amp rating. It's engineered to handle lead-acid batteries used in automotive, marine, and deep-cycle applications, covering flooded, gel, AGM, maintenance-free types, as well as lithium-ion batteries.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
This product was last offered at the strikethrough price on
05-02-2026
This product was last offered at the strikethrough price on
05-02-2026
This is an OEM INA Timing Chain Tensioner. Keeping pressure on the timing chain, this keeps the chain from slipping teeth and causing the timing to be off, potentially leading to engine damage.
OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The NOCO Boost X GBX45 is a portable lithium jump starter designed for 12-volt batteries in vehicles with gasoline engines up to 6.5 liters and diesel engines up to 4.0 liters. This versatile tool is compatible with a wide range of vehicles, including cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, tractors, and more. Featuring an all-new design, the GBX45 delivers extreme jump-starting power for robust engine starts. With a rating of 1250 amps, this portable lithium car battery jump starter releases maximum energy with every start. It's not just an upgrade; it's part of our new Extreme Series, offering exceptional performance and reliability.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GB150 is a compact and high-powered lithium-ion battery jump starter pack, capable of delivering an impressive 3,000 amps for jump-starting a dead battery in seconds. Equipped with patented safety technology, it ensures spark-proof connections and reverse polarity protection, making it safe and user-friendly for everyone. Not only does it serve as a potent battery booster, but it also functions as a portable power source for recharging USB devices like smartphones, tablets, and more, or for powering 12-volt devices such as tire inflators and power inverters. Designed to support a wide range of vehicles including cars, boats, RVs, trucks, and more, it's compatible with gas engines up to 9.0 liters and diesel engines up to 7.0 liters.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The NOCO Boost X GBX155 is a portable lithium jump starter designed for 12-volt batteries in vehicles with gasoline engines up to 10.0 liters and diesel engines up to 8.0 liters. This versatile device is suitable for cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, tractors, and more. Featuring an all-new design, the GBX155 delivers extreme jump-starting power, ensuring robust engine starts. With a rating of 4250 amps, this portable lithium car battery jump starter provides maximum energy with every start. It's not just an upgrade; it's part of the new Extreme Series, offering unparalleled performance and reliability.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GB50 is a highly portable, lightweight, and compact lithium-ion jump starter designed for 12-volt batteries. It allows you to safely jump-start a dead battery in seconds, offering up to 30 jump starts on a single charge. Featuring spark-proof technology and reverse polarity protection, the Boost XL is safe and easy for anyone to use.
In addition to its jump-starting capabilities, the GB50 lithium jump starter comes with a high-output 200 lumen LED flashlight with seven light modes. It can hold its charge for up to one year and includes a USB battery pack for recharging personal devices on the go, providing up to 6 smartphone recharges. The Hot and Cold LED indicators on the internal battery help determine when the Boost is outside operating temperatures, safeguarding your batteries and devices.
Rated at 1,500 Amps, the GB50 is suitable for use on gasoline engines up to 7 liters and diesel engines up to 4.5 liters, making it versatile for cars, vans, boats, SUVs, trucks, and more. The package includes the new HD Precision Boost Battery Clamps for easy connection to any 12V lead-acid battery, along with a USB charging cable, microfiber storage bag, a 1-year hassle-free limited warranty, and free lifetime customer support.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GENIUSPRO50 is an advanced 6-volt, 12-volt, and 24-volt fully-automatic professional smart charger, maintainer, power supply, and battery desulfator. With temperature compensation and a rating of 50 amps, it's suitable for all types of automotive, marine, and deep-cycle batteries.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The NOCO Boost X GBX55 is a portable lithium jump starter tailored for 12-volt batteries in vehicles with gasoline engines up to 7.5 liters and diesel engines up to 5.0 liters. This versatile tool is compatible with a wide range of vehicles, including cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, tractors, and more. Featuring an all-new design, the GBX55 boasts extreme jump-starting power, ensuring robust engine starts with ease. With a rating of 1750 amps, this portable lithium car battery jump starter delivers maximum energy with each start. It's not just an upgrade; it's part of our new Extreme Series, designed to offer exceptional performance and reliability.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GB70 is a compact and powerful lithium-ion battery jump starter pack capable of delivering 2,000 amps for jump-starting a dead battery within seconds. Equipped with patented safety technology, it ensures spark-proof connections and reverse polarity protection, making it safe and user-friendly for everyone. Not only does it serve as a robust battery booster, but it also functions as a portable power source for recharging USB devices like smartphones, tablets, and more, or for powering 12-volt devices such as tire inflators and power inverters. Designed to support a wide range of vehicles including cars, boats, RVs, trucks, and more, it's compatible with gas engines up to 8 liters and diesel engines up to 6 liters.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GEN5X3 is an upgraded version of NOCO's GENM3 with improved features. This model is 37% smaller yet delivers 43% more power, making it one of the most high-performing onboard marine battery chargers NOCO has ever produced. It's a three-bank onboard battery charger with a 15-amp rating (5 amps per bank) designed for 12-volt batteries, including marine, boat, starter, and deep-cycle batteries. You can independently charge and control each battery bank using selectable charging modes such as 12V, 12V AGM, 12V Lithium, and 12V Repair Mode, suitable for all types of lead-acid and lithium-ion batteries.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GB500+ is a powerful portable lithium jump starter delivering 6250 amps, designed to jump-start gasoline and diesel engines up to 45 liters. Its versatility extends to a wide range of vehicles and equipment, including semi-trucks up to class 8, motorhomes, coaches, buses, as well as mining, agricultural, construction, and vocational equipment with 6, 8, 12, and 16 cylinders, and beyond.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
This is the tensioner pulley assembly for the serpentine belts on E39 540i and E38 740u with M62 engine. This tensioner keeps the belt for the alternator, power steering and Air Conditioning taught to provide maximum performance of each system. OEM replacement for BMW part # 11281742858 and 11287503424.
OEM Schaeffler (INA, LuK, & FAG) is an engineering company that focuses on high-performance, precision manufacturing. With their individual brands INA, Luk, and FAG providing exceptionally high quality parts directly to BMW, as well as countless other automotive companies, their history of reliability and variety of offered parts makes Schaeffler a go-to replacement parts provider for all of us here at Turner Motorsport.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
This item fits the following BMWs:
4/1997-1998 E38 BMW 740i 740il
1998 E39 BMW 540i
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GENIUSPRO25 is a fully-automatic professional smart charger, maintainer, power supply, and battery desulfator designed for 6-volt, 12-volt, and 24-volt systems. With temperature compensation and a 25-amp rating, it's suitable for all types of automotive, marine, and deep-cycle batteries.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
The GENIUS2X2 represents a leap forward in power, performance, energy efficiency, and compactness. This advanced charger is a dual-bank system designed for both 6-volt and 12-volt batteries, serving as a charger, maintainer, trickle charger, and battery desulfator all in one. With a rating of 4 amps (2 amps per bank), it caters to all types of lead-acid and lithium-ion batteries, including flooded, gel, AGM, marine, and deep-cycle variants.
Features:
WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. See above warning label as well as http://www.p65warnings.ca.gov for further information on Proposition 65 warnings.
