PWM recommendations
PWM recommendations I had a 30 amp fuse melt down issue with my duel relayed Winstar fans in my 68 Chevelle. The car (non AC) seems to cool pretty well on its own while driving but I guess at some point both fans must have come on and caused a massive surge on the system. Everything is new in the cooling system Superior Dual pass radiator, 165 thermostat with front and rear head steam vents.
Anyway I've been reading a bit here on the forum about PWM for both the fans and fuel pumps so this is a good time for me to look further into these units and see what I can come up with and get some recommendations from you guys.
Two questions : Which brands to look at ? and Are the same units for fans & fuel pumps ? 07 tbss ls2 4l70 trans.
Thanks, Tony
Anyway I've been reading a bit here on the forum about PWM for both the fans and fuel pumps so this is a good time for me to look further into these units and see what I can come up with and get some recommendations from you guys.
Two questions : Which brands to look at ? and Are the same units for fans & fuel pumps ? 07 tbss ls2 4l70 trans.
Thanks, Tony
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From: Central Cal.
I had a 30 amp fuse melt down issue with my duel relayed Winstar fans in my 68 Chevelle. The car (non AC) seems to cool pretty well on its own while driving but I guess at some point both fans must have come on and caused a massive surge on the system. Everything is new in the cooling system Superior Dual pass radiator, 165 thermostat with front and rear head steam vents.
Anyway I've been reading a bit here on the forum about PWM for both the fans and fuel pumps so this is a good time for me to look further into these units and see what I can come up with and get some recommendations from you guys.
Two questions : Which brands to look at ? and Are the same units for fans & fuel pumps ? 07 tbss ls2 4l70 trans.
Thanks, Tony
Anyway I've been reading a bit here on the forum about PWM for both the fans and fuel pumps so this is a good time for me to look further into these units and see what I can come up with and get some recommendations from you guys.
Two questions : Which brands to look at ? and Are the same units for fans & fuel pumps ? 07 tbss ls2 4l70 trans.
Thanks, Tony
For the fuel pump look up Vaporworx. They have very good fuel system controls. He (Carl Casanova) also has a fan PWM controller ( co-designed by Brian Baskin) sold thru Northern Radiator. Both are excellent units.
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From: Montgomery (Lake Conroe,) TX north of Houston
I've been using the DCC unit to control my Lincoln MKVIII electric fan in my Fox Body Mustang since about 2008. It's been flawless! This fan and controller are going to be installed in my Fox coupe project that you can see in my signature.
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From: Central Cal.
TECH Senior Member
Joined: Jun 2016
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Likes: 3,625
From: Central Cal.
Did you go with the FK45 or FK75? I'm on the fence between those. I know the Mk 8 fan is a real amp-sponge, and if you have the FK45, that is what I will go with too.
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As for the Vaporworx fuel pump PWM at 429 plus tax & shipping they like it a lot more than I do.
Thanks again.
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Good PWM isn't cheap, because of all the development that goes into it. If the fan unit you have has 2 fans, use them both. Otherwise the one fan will suck air across the back of the radiator from the other fan hole instead of thru the radiator. Your cooling and fuel systems are not places to cut corners.
Good PWM isn't cheap, because of all the development that goes into it. If the fan unit you have has 2 fans, use them both. Otherwise the one fan will suck air across the back of the radiator from the other fan hole instead of thru the radiator. Your cooling and fuel systems are not places to cut corners.
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From: Montgomery (Lake Conroe,) TX north of Houston
It's been so long ago that I'm not sure, but I think that it was the FK45. I just went out and looked at the DCC unit and there is a sticker on it but it's completely faded out. I'm 99% sure that I have the 45.
It's been great all of these years and I highly recommend DCC. I'll buy another one for my next project!
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From: Central Cal.
TECH Senior Member
Joined: Jun 2016
Posts: 22,301
Likes: 3,625
From: Central Cal.
It's been so long ago that I'm not sure, but I think that it was the FK45. I just went out and looked at the DCC unit and there is a sticker on it but it's completely faded out. I'm 99% sure that I have the 45.
It's been great all of these years and I highly recommend DCC. I'll buy another one for my next project!
It's been great all of these years and I highly recommend DCC. I'll buy another one for my next project!
Last edited by G Atsma; Jun 3, 2022 at 04:58 PM.
I run this dual relay setup in mine...
These are 70 amp relays...I'd have to look, but I think I run 30 amp fuses for each fan...never had a problem running both or just one. (I trigger mine with the factory ECM)
I know this is probably a mute point if your going PWM.
Not all fuses are created equally. A 30a ATM fuse is going to blow a lot sooner than a 30a Maxi fuse for example. The fuse can take a certain number of short duration high current events and eventually will fail; that behavior will be different depending on the fuse design. The rated ampacity of a fuse only tells you where it will blow given enough time - the time-based performance of a fuse will vary by manufacture, form factor and design objectives, but generally speaking larger package fuses like maxis will sustain longer durations of high currents than smaller ones like ATMs or ATCs.
Fans have high inrush currents which is why a lot of OEs used fusible links instead of fuses. With PWM control it's a lot easier to limit current draws but there are still inrush currents to deal with at startup.
What kind of fuse are you using now?
Fans have high inrush currents which is why a lot of OEs used fusible links instead of fuses. With PWM control it's a lot easier to limit current draws but there are still inrush currents to deal with at startup.
What kind of fuse are you using now?
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