![]() Since the pcm sends the higher of the 2 values the fan ends up going slower instead of faster so I ended up using only one input for ac pressure.įinally I ended up buying a junkyard c7 cooling fan with the 600 watt motor and swapped the motor+ blades into my aftermarket 500 watt (14") spal fan housing (fit perfectly) and now I run the fan from the ecu as any other GM fan would.ītw I have a camaro ss fan (850 watts) thats running as a standalone puller on the same vehicle using spals brushless fan sensor.For hundreds of years, scientists have been conscious of the effect of sound on the human body. The after market uses different logic, almost the inverse of GM logic so I ended up on other forums (computer chip) trying to figure out a way to reverse the signal as I am using the fan as a pusher and have 2 inputs from the ecu for ac pressure and ect. I thought no one would reply to this thread so I didnt follow up after a month but brent is right on the money. ![]() 063" 3003 sheet and mounting the C7 fan as if it were just another universal aftermarket unit. I picked up a 4.2L Trailblazer fan shroud ($22, new) and trimmed off anything that wasn't needed. so I cut away everything but the fan itself. I really, really needed the fan connector on the driver side which would have meant rotating the C7 shroud upside down which would have put the flappy-vent things upside down and therefore non-functional. The C7 aux distribution block is compact, fits in a easily adapted bracket, has a nice secure cover, offers a B+ IN post, a 225A fused ALT post, an 80A FAN post, and a 100A post, used in the C7 for the EPS, but could be used for any other suitable high current accessory if you ever needed it.Ĭ7 aux distribution block/bracket/cover: 23173653/23173654/23491757 I'm using an E40, haven't tested it yet, I have all the major parts on hand (still gathering the last wiring bits and pieces). The shrouds and blades are the same, only difference is the motors. Pull a '14-up Corvette tune from the repository for a look at the differences. Hopefully this helps, if not, call SPAL USA and ask for Brent.Ĭ6 brushed 400W fan with that big Siemens module uses 'PWM Electric' logic, C7 brushless SPAL uses 'PWM EV'. Typically SPAL will select a frequency range way outside of normal operating ranges for diagnostic purposes. There is no duty cycle that you can send the fan to enter a diagnostic mode. So constant 12V or constant ground on the signal wire doesn't make the fan run. The fan is "OFF" from 0% to 15% and 95% to 100% duty cycle. The ramp is linear between 15% - 90% Duty Cycle. The fan is accurate to 1% duty cycle, so it can tell the difference between 14% duty cycle and 15% duty cycle, so we are dealing with very precise control of the fan.įor SPAL Aftermarket brushless fans: (Not SPAL OEM brushless fans)ġ5% Duty Cycle = minimum speed = 25% of full speed RPM.ĩ0 - 95% duty cycle = full speed = 100% RPM. It also depends on how the fan "interprets" the signal you send it. So the duty cycle you send the fan doesn't necessarily correspond exactly to the requested % Speed of the fan. Keep in mind you're only controlling the signal request to the fan, the fan just responds to the signal you're sending it. The fans they sell to the aftermarket/hot rod guys have different software/hardware requirements to prevent plug and play on different vehicles. What is the part number off the fan you're using? The fans SPAL makes for OEM customers are often (read "always") different software or hardware to make the product custom/specific/proprietary to their OEM customers. I believe whats happening is that the fan is taking whatever signal is coming to it and reversing it or something.Īnyone have experience tuning such a fan? I used the same ECU to control an OEM spal brushless fan and I didnt have any issues calibrating it, 10% ECU meant 10% fan and 90% ECU meant 90% fan. Now I know that those aftermarket fans made by spal are different from the OEM ones, and they runs from 30% to 90% duty cycle where 30% is their lowest startup speed and 90% is the highest, above 90% is for diagnostic purposes.ġ0% duty cycle at ECU equals 90% at fan (max speed)ħ0% duty cycle at ECU equals 30% at fan (min startup speed)ĩ% or less duty cycle fan will start & go to high speed then off. My problem is when I command a High duty cycle the fan goes to low speed and when I command a Low Duty cycle it goes to high speed. I got the fan settings at PWM electric and frequency at 128 Hz. I am trying to control a SPAL brushless fan using an E67 ECU.
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