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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Sep-05-2017, 06:06:23 PM   #51
Engrmikl
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Default Re: Koyo radiator experience?

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Originally Posted by Move_Over View Post
I'm not sure the CSF is as evil as people think, at least in my case. I took a hard drive yesterday after a bleed/rebleed/triplebleed at 97 degrees and my temps were rock solid at 168F (I have a water temp sensor at the block, not the oem water temp sensor). I am driving Sebring this weekend (if Irma leaves me alone) so I will have a better track experience with the CSF radiator.

I think the kicker is the bleeding. But, that's my .02.
Thanks for the info. Please let me know how it runs.
And no I don't think Irma is going to leave South Fl alone. My place is in Sunrise but I am up in SC for work so going to miss the party.
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Old Wed, Sep-06-2017, 12:53:00 AM   #52
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Default Koyo radiator experience?

I will probably order one as well, that's a good price. It says it comes with a 1/8" NPT fitting. I already have the 1/8" NPT radiator hose adapter so not a deal breaker.

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Old Wed, Sep-06-2017, 01:24:07 AM   #53
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Default Re: Koyo radiator experience?

The part number is the same as the one I have, so either that vendor added one or their ad is wrong. Mine does not have an NPT bung.
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Old Wed, Sep-06-2017, 03:17:49 AM   #54
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Default Re: Koyo radiator experience?

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Originally Posted by Engrmikl View Post
Thanks for the info. Please let me know how it runs.
And no I don't think Irma is going to leave South Fl alone. My place is in Sunrise but I am up in SC for work so going to miss the party.
No sebring for me this weekend. Event got cancelled. Hoping for the best.
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Old Wed, Sep-06-2017, 03:22:09 AM   #55
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Default Re: Koyo radiator experience?

No NPT bung on mine either
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Old Thu, Sep-14-2017, 03:47:44 AM   #56
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Default Re: Koyo radiator experience?

I installed the Koyo as well as doing a complete overhaul of the cooling system(hoses, fan switch, t-stat, water pump, fan clutch, expansion tank). I'm running 70/30 coolant mix plus NanoCool. Also, the a/c condenser and oil cooler was thoroughly cleaned out.

At the track, the temps were slowly starting to rise, and by the middle of third session, the needle was touching the red zone. The temperature returned to normal after I pitted, and it was absolutely fine on the way home.

There's no evidence of coolant in the oil, so I'm ruling out the head gasket. The temperatures are normal in day to day driving. Even in the hottest days with the ac on, there's no issue at all. But, in track conditions when the engine is under load, I'm suspecting that there isn't enough air flowing through the radiator, eventually causing heat soak. The Koyo is quite a bit thicker than stock.

At this point, I really don't know what else it could be. I'm thinking about putting an OEM radiator. Everything else has been replaced.

Also, the install was not as easy for me. My shop had to do some cutting to account for the extra thickness, and the bottom screw holes were mis-aligned and had a different pitch.
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Old Thu, Sep-14-2017, 12:03:21 PM   #57
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Default Re: Koyo radiator experience?

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Originally Posted by speeeding View Post
I installed the Koyo as well as doing a complete overhaul of the cooling system(hoses, fan switch, t-stat, water pump, fan clutch, expansion tank). I'm running 70/30 coolant mix plus NanoCool. Also, the a/c condenser and oil cooler was thoroughly cleaned out.

At the track, the temps were slowly starting to rise, and by the middle of third session, the needle was touching the red zone. The temperature returned to normal after I pitted, and it was absolutely fine on the way home.

There's no evidence of coolant in the oil, so I'm ruling out the head gasket. The temperatures are normal in day to day driving. Even in the hottest days with the ac on, there's no issue at all. But, in track conditions when the engine is under load, I'm suspecting that there isn't enough air flowing through the radiator, eventually causing heat soak. The Koyo is quite a bit thicker than stock.

At this point, I really don't know what else it could be. I'm thinking about putting an OEM radiator. Everything else has been replaced.

Also, the install was not as easy for me. My shop had to do some cutting to account for the extra thickness, and the bottom screw holes were mis-aligned and had a different pitch.
You could try deleting the Aux fan and mechanical fan and running a spal. I did that when I installed my koyo and my coolant temp was dead center all day long at the track. The Aux fan and shrouds block a lot of airflow.
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Old Mon, Sep-25-2017, 04:20:26 AM   #58
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Default Re: Koyo radiator experience?

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Price is now $562!
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Old Mon, Sep-25-2017, 12:15:15 PM   #59
Engrmikl
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Default Re: Koyo radiator experience?

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Price is now $562!
Redline still has them at $395 plus shipping to S Florida was $37
Just bought one last week.
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Old Mon, Sep-25-2017, 05:29:53 PM   #60
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Default Re: Koyo radiator experience?

Ok cool, thanks.
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Discussing Koyo radiator experience? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)