In GM LS applications GM used three relays to control your fans in series to enable the fans to work together. – Dave Emanuel, Digital EFI. We curently offer several types of PWM controlers E38-PWM-CAN. Besides sensor location, the number of bolts that hold the cam gear in place changed over the years. You see, while the Gen III, Gen IV, and even the Gen V engines may look similar when torn down to their base materials, there are some differences that you’ll need to know before you can make any computer work properly with them. Dave Emanuel helped us understand some of the differences between various production years and what to look for if shopping for an OEM computer for your LS swap. OEM and aftermarket ECUs both have provisions for driving electric fuel pumps. Entropy has a two speed controller that needs two fans. When they first came out in the new-at-the-time C5-generation Corvette, they were a totally new design, and not many folks outside of Chevrolet knew what to make of it. Some are self-contained, while others require separate modules to make everything work or to expand their capability. Chevy Hardcore NEWSLETTER - SIGN UP FREE! Want to run a carburetor? While the various offerings are great for enthusiasts, knowing which one is best for you requires some research. The power and fuel efficiency of the LS-based engines is a result of EFI and other techniques. Items like drive-by-wire throttle, Active Fuel Management (displacement-on-demand), and cam phasing on later offerings were all factory tricks to get the most power for the least amount of fuel and emissions. Your vintage car can also benefit from their design. Multiple temperatures can be used to control the PWM. While you can likely get away with a low-pressure fuel system if you’re using a carburetor, you’ll still need an electric fuel pump somewhere, and a means for operating the ignition. You will need a PWM signal, but both fans have the PWM controller built in. Another major player in the LS controller arena, Holley offers several EFI controllers for LS applications. Sure, it had 345 horsepower – more than its predecessors – but being drawn from a clean sheet of paper, there was little besides its bore centers and the term “small-block” that linked it to previous powerplants. This made perfect sense, since those ECUs were already designed to make use of new technologies used on the Gen III engines. While searching around for fans to cool the LS3 swap I came across two good possibilities. The PWM Fan Controller Module can control up to two fans, supporting up to a maximum of 65 amps. Comparing wire schematics between an LS-series engine and Vortec V-6 or Vortec V-8 engine reveals that the same IC circuit controlling ignition coil 1 on the LS-series engines is used to control the ignition control module (ICM) of the Vortec V-6 and Gen I small-block Vortec V-8 engines. Since the position of the camshaft dictates this timing, a camshaft position sensor is used to share this information with the ECU. A Fan Controller is a perfect accessory for enthusiasts looking to take charge of their whole system. That will require a program like EFILive, even if you’re not tuning for more power. Early LS1 intakes have the bosses but didn’t have the M6-1.0 threaded inserts necessary to bolt the throttle bracket to the intake. Product Description PWM FAN CONTROLER with AC PRESSURE MONITORING The module is a standalone option for controling a chrysler style PWM fan knows as a pentastar fan. The PWM works on what Derale calls slow start technology, in which the current that goes to the fan motors is not a blast of current, rather it arrives in a controlled manner from the PWM. Whereas the lack of a distributor and an Octuplet of coils mounted on the valve covers originally made many enthusiasts scratch their heads, time has shown that the early adopters were right, and there are benefits to be had in this new engine configuration. Early homemade fan controllers used a simple “volt mod” by choosing 5, 7 or 12V from a classic molex connector. If you’re looking for plug and play, EFI Source has a controller using their MicroSquirt ECU. The LS platform does not have provision for a mechanical fuel pump, so you’ll need a way to control the amount of fuel your engine receives from the tank.
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