** Click here for installation instructions** Here are the heat soak-related torque losses Turner experienced: 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. The test: following this procedure once with a stock IAT, and once with their relocation kit in place. The fans were then turned on for three more runs to observe the recovery rate once air flow was reintroduced. 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. Replicating stop-and-go traffic heat soak in a 2001 540i was a simple task in a controlled environment - their dynometer.
They first set out validate the functionality and performance benefit of a temp sensor relocation. The Turner engineering team was initially skeptical of the claimed performance benefits of this modification. The result is you’ll experience reduced torque loss and more consistent power output when you’re pushing your engine hard. 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. 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. Compensating for this false hot air measurement, the ECU pulls timing and runs a richer fuel mixture, resulting in a significant loss of torque. Absorbing excess heat from its surroundings, the MAF can’t shed it fast enough, and the ECU reads an inaccurately high intake air temperature. 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. Engine management systems constantly monitor operating conditions and modifying parameters based on sensor inputs. All vehicles will lose some degree of performance due to heat soak under the right operating conditions.
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