DIY DIY EKPM3 Active Cooling for LPFP
- Thread starter fmorelli
- Start date
The fan looks nice.
Are there holes for the hot air to escape? I saw more of your posts on another forum that show the added heat sinks but if the air can't blow into the case and escape somewhere then I don't see how the air will flow and cool things.
I agree with ajm8127 The bottom aluminum is really the heat sink here. Adding the small one on the top side chip isn't likely to do much when there is a 50x bigger one already on case bottom.
Has anyone tried a fan that blows air thorough a finned heatsink added to the outside of the case like ajm8127 but also with a fan? That would likely be much more effective.
The the more metal the air flows through the better it will cool.
-Rich
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Yes, there are a bunch of holes drilled in the side for the hot air to escape.
I have a Walbro 535 and Walbro 450 on this setup and ran some races last year, no issues at all.
Just wanted to say Thx for this thread. Gave me the confidence to put the thermal tape layers on and use thermal adhesive to put a heat sink on the mosfet. I also stuck some old finned heat sinks I had lying around to the back of the mount. Coded with Protool and we are running. Will have to see if the 6393 code comes back...(crosses fingers)
So far so good. No codes, car is running fine.
Do you mean the Fan? I 3D printed the board the fan is mounted on. I don't know if I have any pics with the cover off as it has been a while.
I've been thinking about this 'problem' for a little while.
I'm not going to go back and read but I'm fairly confident I know why they overheat. Our low pressure sensor is at the HPFP line. That's (guestimated) 20 feet from the fuel pump. That is around 28psi of pressure drop. Or the pressure at the pump output line is actually 70psi + 28psi (or whatever the pressure drop is). Look up on the fuel pump chart how many amps 98psi is (and flow to also understand why you need 2 pumps at such a low power level). I believe it's right on that 20 Amp line, which I believe the EPDM is rated for.
But then there's the Filter/Regulator that is rumored to be set below that, IIRC. So the target really can't be held and is only really reached when the HPFP demand isn't at peak ... once you grab 4th pressure crashes.
It all comes back to line size and pressure drop because of. Fans and the like, aren't going to fix the root problem.
I'm not going to go back and read but I'm fairly confident I know why they overheat. Our low pressure sensor is at the HPFP line. That's (guestimated) 20 feet from the fuel pump. That is around 28psi of pressure drop. Or the pressure at the pump output line is actually 70psi + 28psi (or whatever the pressure drop is). Look up on the fuel pump chart how many amps 98psi is (and flow to also understand why you need 2 pumps at such a low power level). I believe it's right on that 20 Amp line, which I believe the EPDM is rated for.
But then there's the Filter/Regulator that is rumored to be set below that, IIRC. So the target really can't be held and is only really reached when the HPFP demand isn't at peak ... once you grab 4th pressure crashes.
It all comes back to line size and pressure drop because of. Fans and the like, aren't going to fix the root problem.
i just installed my upgraded line. I believe the sensor is no more than 10ft from the pump including the in tank lines.
Attached another / my solution:
I drilled holes in the holder bracket, added some longer screws (still a little bit short) and used thermal paste between the heatsink / EKPM3. (Besides this I exchanged the thermal pad in the module and added a mini heatsink on the motor bridge with thermal glue as already mentioned here).
The big heatsink dimension is 100mm x 100mm x 18mm. Clearance is not a problem. I did nothing with the cables behind the heatsink (not necessary, see pics). Car: E90
I drilled holes in the holder bracket, added some longer screws (still a little bit short) and used thermal paste between the heatsink / EKPM3. (Besides this I exchanged the thermal pad in the module and added a mini heatsink on the motor bridge with thermal glue as already mentioned here).
The big heatsink dimension is 100mm x 100mm x 18mm. Clearance is not a problem. I did nothing with the cables behind the heatsink (not necessary, see pics). Car: E90
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