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Thanks for the pointers. I would really love to avoid pulling the engine, but I'll have to look at all the other refresh work I want to do and see if the net benefit for each task outweighs the hassle of pulling the engine. If I can get this addressed without needing to access the IACV and AAC, it would save me a lot of headaches.
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I think he meant Haltech meant that the Haltech PDM doesn't like driving loads with PWM. Not that the pumps don't like it. Think about the heatsinks that we strap onto SSRs for just handling a single PWM load. Then picture how much heatsinking is visible on a Haltech ECU or PDM. None, right? So it's no surprise that they don't want to run PWM loads directly.
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By Murray_Calavera · Posted
For example, the Walbro 525 (F90000285) is the factory fuel pump in the Hellcat which has PWM from factory. These pumps like PWM, it extends the life of the pump. -
I think the PDM outputs (the ones that can actually output big power) are not intended to be driven like that. They're either on or off, switched only at a low rate. To do PWM you need to use an ECU output that is PWM friendly (ie, able to be run at high frequency) and drive a separate SSR, instead of trying to thrash the (presumably) SSRs in the PDM.
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