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Not too long ago, my fans stopped working. The fans just seized. Looked around for replacement, and they were too expensive going oem FD. And I did not want to go aftermarket electric because they wouldn't cool as good as stock. So, I bought myself rx8 fans, the whole setup with the shroud for $50 out of a 2009 rx8, and simply swapped them instead of the rx7 fans. All you have to do is take them out of the rx8 shroud and drop them into the rx7 shroud and wire them up. The colors are the same, but if anyone needs, I have wrote out what fan wires correspond with the harness wires.
They cool better then the stock white fd fans. These fans are actually the same fans (?) as the 99 spec fd's come with. You can get rx8 fans dirt cheap.
They cool better then the stock white fd fans. These fans are actually the same fans (?) as the 99 spec fd's come with. You can get rx8 fans dirt cheap.
that is correct, the 99+ FD fan blades are the same as the Rx8, and a couple of other Mazda's
$50 out of a 2009 rx8, and simply swapped them instead of the rx7 fans. The colors are the same, but if anyone needs, I have wrote out what fan wires correspond with the harness wires.
I got an earlier RX8 fan setup, and it only had two wires, not the four like the RX7.
How did you do the wiring ? I did the same color, and mine spun backwards, then the 60-amp fuse blew!
:-( neil
Last edited by M104-AMG; Oct 23, 2015 at 12:58 PM.
i'm sure it can be done , you have to look at an RX8 and see what each color does . which ones are positive or neg , Than you need to study how the FD system works and than its simple you just rewire it .
Attached are two cooling fan schematics for the 1993 RX7 and a 2008 RX8.
Assuming I want the full functionality of the 1993 RX7 fan relays (there are four of them), I think I need to do the following:
Fan#1 fed by connector B-05:
Bridge the positive (+) feeds from Connector B-05 (Y/W) and (R/W) to the Blue (L) wire of the the RX8 Fan motor #1. Ground will come from bridging (B) wire and (L/O) to Green (G) wire of the RX8 Fan motor#1.
Fan#2 fed by connector B-06:
Bridge the positive (+) feeds from Connector B-06 (Y/W) and (W) to the Red (R) wire of the the RX8 Fan motor #2. Ground will come from bridging (B) wire and (L/O) of connector B-06 to Black (B]) wire of the RX8 Fan motor#2.
However, the schematics show the RX7 fan-motors as 4-poles (two positive; two negative); and the RX8 fan-motors are 2-poles (single positive, and single negative).
Will this cause a problem ? Any back-feeding ? It doesn't seem like to me.
Moreover, before finalizing, I need to verify that adding +12VDC to either the Blue (L) or Red (R) wire of the RX8 fan-motors, will make them rotate in the the correct direction.
Man, nothing is SIMPLE about this car . . . .
:-) neil
PS: here's a mock-up of the wiring, any issues ?
Last edited by M104-AMG; Oct 23, 2015 at 02:09 PM.
So please correct me if I'm wrong (I did some research):
1. S1 ('04-'08) RX-8 fans have two different fan motors and are not the best solution for this mod, the motors have two wires coming out of them
2. S2 ('09-'12) RX-8 have two identical fan motors with 4 wires coming out of each motor, these are the ones you want, part number N3R1-15-150, motors can be found new and OEM for $55 per motor (for those that want brand new motors)
3. Fan blades are the same on S1 and S2 RX-8 (5 and 7 blades)
4. The fan blades from the RX-8 are the same as the upgraded '99 spec fan blades?
So the best solution for this "mod" is to either:
a) find a complete fan assembly (shroud, fan motors and blades) from a '09+ S2 RX-8 and remove the motors and blades and place them into your FD shroud (what R7rexy did)
or
b) Buy brand new S2 fan motors and acquire new or used S1 or S2 RX-8 fan blades
Does this seem right? I don't even want to get into the electrical stuff right now...that's way beyond me at this point.
So is this something worth doing? Where I live summers can get pretty hot so anything that helps cooling is appreciated.
After reading DaleClark's Cooling Fan Control lecture ( https://www.rx7club.com/3rd-generati...system-906142/ ) and reviewing the Cooling Fan Control System diagram along with the RX8 series II diagrams, the only way to get the multi-speed multi-inputs is to use the Series II RX8 fan motors or stock motors.
If I want FULL fan all the time, it looks like I need to wire just both Series I RX8 fan to Fan Relay #1.
For about $100, I'm going to get NEW RX8 Series II fan motors.
:-) neil
Last edited by M104-AMG; Oct 24, 2015 at 09:29 AM.
My set of RX8 fans just arrived, later series with 4 wires.
I will be replacing the stock rx7 fans and testing to see if coolant temps are any different back/back in same ambient temperatures / road temps
I have a fan controller as part of EWP unit. Plan was to wire both positive wires to a positive source off of a brand new high amp relay, then have both negatives connected to a constant ground. Have the relay triggered by the fan controller to flip on the juice. So this should be high speed or off, correct?
Or you could wire up the RX8 Fans the way GM does it with 3 relays. Low signal from Ecu switches the 3 relays to a series (6v each fan), high signal from the ECU converts the circuit to Parallel(12veach fan)
I've fitted the rx8 fans to my FD rad, but the motor spindles are smaller than the holes on the rx8 fan blades.
This could be easily fixed by cutting a thin strip of aluminium from a coke can and wrapping it around the FD motor spindles. The rx8 fan holes are only marginally larger than the FD ones, so making the FD spindles a little fatter will do the trick.
