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Series II Technical and Trouble shooting Discuss technical details for the Series II RX-8 and any issues or problems you are facing

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Old Jan 18, 2019 | 08:27 PM
  #1  
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Part ID


Howdy what's this gizmo ? My S1 doesn't have it Cheers
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Old Jan 18, 2019 | 10:30 PM
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That's the cooling fan control kit from RX8Performance, or something similar to it.

Basically, it keeps the coolant temperature lower by telling the fan to come on earlier. IIRC it keeps the coolant temp below 90 C instead of the factory 98 C.
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Old Jan 18, 2019 | 10:32 PM
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Thanks mate. Previous owner also fitted silicone radiator hoses. He lived in an extremely hot area. Makes sense
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Old Jan 20, 2019 | 02:27 AM
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Originally Posted by UnknownJinX
That's the cooling fan control kit from RX8Performance, or something similar to it.

Basically, it keeps the coolant temperature lower by telling the fan to come on earlier. IIRC it keeps the coolant temp below 90 C instead of the factory 98 C.
I'm just wondering if it's working properly. My S1 fans are louder than the S2 fans after engine is switched off when hot. I was parked for 5 minutes today with engine running in 107f 42c heat and temp gauge went over half way
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Old Jan 20, 2019 | 02:35 AM
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....

Took these pics when coolant temp was 105c

Maybe I should disconnect it ?
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Old Jan 20, 2019 | 05:39 AM
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Also fan comes on with ignition when cold ?
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Old Jan 20, 2019 | 08:04 AM
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Originally Posted by Sydo
Also fan comes on with ignition when cold ?
You sure that's the radiator fan and not the secondary air injection pump?
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Old Jan 20, 2019 | 08:10 AM
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Originally Posted by NotAPreppie
You sure that's the radiator fan and not the secondary air injection pump?
just went and checked fan noise from front and can feel air near coolant overflow.
doesnt air pump only come on when engine is running ?
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Old Jan 20, 2019 | 10:09 AM
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Ok cooling fan comes on when cold and stays on all the time . Checked up to operating temp. Maybe whoever did the mod didn't do it right ? So maybe just one fan is working hence it went over half when idling today ?
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Old Jan 20, 2019 | 10:13 AM
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Unsure about relay wiring
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Old Jan 20, 2019 | 10:57 AM
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Sounds like they might have forced fan 1 to operate all the time. Hard to conclude without being near the car, but faced with such a situation, I'd disconnect any wiring associated with this mod and restore stock functionality. If you still have heating problems then we can diagnose from there.
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Old Jan 20, 2019 | 11:22 AM
  #12  
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Originally Posted by Sydo
just went and checked fan noise from front and can feel air near coolant overflow.
doesnt air pump only come on when engine is running ?
The air pump only runs for a short time when starting up the car after the engine has cooled. It dumps air into the exhaust to help light off the catalytic converter faster.

Originally Posted by Loki
Sounds like they might have forced fan 1 to operate all the time. Hard to conclude without being near the car, but faced with such a situation, I'd disconnect any wiring associated with this mod and restore stock functionality. If you still have heating problems then we can diagnose from there.
What he said.
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Old Jan 20, 2019 | 02:12 PM
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Loki so it's ok to just cut those wires off relays ?

Shouldnt really need this mod with S2

Last edited by Sydo; Jan 20, 2019 at 02:19 PM.
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Old Jan 20, 2019 | 02:15 PM
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Originally Posted by NotAPreppie
The air pump only runs for a short time when starting up the car after the engine has cooled. It dumps air into the exhaust to help light off the catalytic converter faste.
Yes I did say fan was on with ignition only
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Old Jan 20, 2019 | 03:20 PM
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Ok set up is back to factory but fan still comes on with ignition on which doesn't seem right
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Old Jan 20, 2019 | 04:40 PM
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This the correct stock setup. The extra relay in the green circle is for the optional seat heaters, and I wouldn't be surprised if Australian cars don't come with them.

The previous owner set it up wrong, BTW. The instructions say that you need to replace fan relay 1 and 2 with the provided units, except the kit is designed for S1, and while it works for S2, fan relay 2 in S1 is called fan relay 3 in S2 and vice versa, so you need to pull out fan relay 3 on an S2 and replace it with the relay in the kit. If you wish to use the kit, the two relays in the red circle are the ones you use.

I also included a picture of the relay for fan relay 2. It's a different unit compared to relay 1 and 3.
Attached Thumbnails Part ID-img_20190120_134830-1536x2048.jpg   Part ID-img20190120143851.jpg  
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Old Jan 20, 2019 | 04:55 PM
  #17  
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Yes I just replaced far right one with the correct blue one and no difference still
please do me a favour and see if your fan comes on with ignition and stays on when started

Last edited by Sydo; Jan 20, 2019 at 05:06 PM.
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Old Jan 22, 2019 | 11:47 AM
  #18  
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Originally Posted by Sydo
Yes I just replaced far right one with the correct blue one and no difference still
please do me a favour and see if your fan comes on with ignition and stays on when started
I have an S2. My fans do not come on with the ignition when cold.
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