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Old 04-01-2014, 05:05 PM   #21
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Yes undertray.

I thought that turbo Miata should be able to cool itself at highway speeds with undertray but no fans? I have heard it said that fans are for parking lot speeds.

Am I wrong?

Radiator was cake install btw. Hardest part was installing the new hoses. Wiring was cut and spliced to make a pretty install as well.
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Old 04-01-2014, 05:07 PM   #22
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Quote:
Originally Posted by Chiburbian View Post
Yes undertray.

I thought that turbo Miata should be able to cool itself at highway speeds with undertray but no fans? I have heard it said that fans are for parking lot speeds.

Am I wrong?

Radiator was cake install btw. Hardest part was installing the new hoses. Wiring was cut and spliced to make a pretty install as well.

In talking with FM last time i was out there, they said that their airflow testing showed that the fan was pretty much necessary at highway speeds as well due to poor flow design of the bumper. Adding an intercooler in front makes things worse.
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Old 04-01-2014, 07:36 PM   #23
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At cruising speeds I never saw temps rise above 195, so you are running pretty hot I would say. Did you try to burp air out?
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Old 04-01-2014, 07:38 PM   #24
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At cruising speeds I never saw temps rise above 195, so you are running pretty hot I would say. Did you try to burp air out?
With or without fans?
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Old 04-01-2014, 07:51 PM   #25
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1st fan turns on at 206, so no.
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Old 04-01-2014, 07:53 PM   #26
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The only Miata i've been in that would exhibit that behaviour is our current 95. And that's only because garbage Begi Racer Re-route.
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Old 04-01-2014, 07:56 PM   #27
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Failed to mention the car is still on stock power.
Though I have a friend with FFS and his temps are similar (no intercooler though).
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Old 04-01-2014, 07:59 PM   #28
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So..... not relevant, correct?
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Old 04-01-2014, 10:31 PM   #29
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I am going to change my fan temps to 200;210 with a 5 degree hysterisis and I will report back when I have driven a bit more. I know it's my thread but I don't want to divert the intent too much longer.
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Old 04-02-2014, 08:35 AM   #30
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Intercooler needs to be back away from the bumper mouth enough so that most of the air goes around it and not through it. If you have the intercooler blocking the airflow into the bumper mouth you are creating a large obstruction and the car will overheat. BTDT. After I moved my intercooler back toward the radiator cooling improved substantially.
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Old 04-02-2014, 09:02 AM   #31
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In talking with FM last time i was out there, they said that their airflow testing showed that the fan was pretty much necessary at highway speeds as well due to poor flow design of the bumper.
rofl.

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Old 04-02-2014, 09:51 AM   #32
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rofl.

Yeah, I saw that too.

For the record, guys, fans should never be needed when cruising at highway speeds. If they are needed then your factory ducting is missing, your homemade ducting is bad, your bumper mouth is clogged with a poorly positioned intercooler, or you have some other problem.
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Old 04-02-2014, 10:02 AM   #33
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Quote:
Originally Posted by Chiburbian View Post
Yes undertray.

I thought that turbo Miata should be able to cool itself at highway speeds with undertray but no fans? I have heard it said that fans are for parking lot speeds.

Am I wrong?

Radiator was cake install btw. Hardest part was installing the new hoses. Wiring was cut and spliced to make a pretty install as well.
A miata should have no problem at speed keeping the car at temp without having the fans on. This has been true on my 92 with 330k with a stock radiator and stock ducting, my 94 turbo car in various configurations of turbos and ducting setups. Stock fans on a stock ecu are set to come on at about 207 degrees. In my MS I have fans set to come on at 207 degrees, then turn off below 195, tps 100% or speed is above 35mph.
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Old 04-02-2014, 10:20 AM   #34
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Quote:
Originally Posted by Braineack View Post
rofl.

Quote:
Originally Posted by sixshooter View Post
Yeah, I saw that too.

For the record, guys, fans should never be needed when cruising at highway speeds. If they are needed then your factory ducting is missing, your homemade ducting is bad, your bumper mouth is clogged with a poorly positioned intercooler, or you have some other problem.

Hey, all i know is what i was told. And that my **** couldn't keep up on the highway with the Mishi fans, but was fine around town. Was fine everywhere after the SPAL fan upgrade.

Anecdotes FTW!
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Old 04-02-2014, 10:44 AM   #35
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did you know that driving creates one big fan in front of your car?
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Old 04-02-2014, 10:46 AM   #36
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ZOMG!!! No waiii!!!!!!
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Old 04-02-2014, 10:47 AM   #37
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yeah; amazing stuff.
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Old 04-02-2014, 11:19 AM   #38
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Old 04-02-2014, 11:19 AM   #39
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