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Old 05-02-2007, 10:11 AM   #1
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Default Good Read: underhood temps, airflow, etc.

I have some fairly massive heat issues when sitting in traffic after making boost runs. When my bigass fan cuts on, the hot air blasts around the edges of my headlights. Popping them up helps dramatically. So I was doing some research on google and came across this thread. Nice when somebody else does the work.
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Old 05-02-2007, 11:17 AM   #2
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Has anybody in the Miata community done all the pressure testing and definitively come up with the best way to get air in the front and out the bottom.

I haven't had a single overheating issue, but it's about the start of the Virginia summer... so I'll be on the lookout for melting **** and knock.

My current applicable mods are:
Standard Prestone green stuff.
Dual Fan Mod
Stock plastic undertray and stock plastic front radiator funneler tunnel thing removed.
No AC condensor.
27x6x2.5" FMIC about 1" in front of radiator.
Custom sheetmetal brace for IC.
Circular hole cut in cowl near brake master cylinder (Randall style).
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Old 05-02-2007, 11:18 AM   #3
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Nice read. Thanks.
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Old 05-02-2007, 11:33 AM   #4
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Good read. That pressure tool sounds pretty damn useful.

I know people love their TSI and NACA ducts (I have one now...thanks brain), but I remember someone did test the pressures and found that without an extraction hood (a la FM) that TSI and NACA ducts that were not sealed off from the engine bay (a la Begi's cold air box) increased underhood pressure and decreased radiator airflow, but it was quickly shot down by the people who owned one of these items. Nice thing is that data = fact vs. opinions of "my engine bay felt cooler."
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Old 05-02-2007, 11:34 AM   #5
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Cool stuff. I need an undertray.
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Old 05-02-2007, 11:53 AM   #6
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hmmm.
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Old 05-02-2007, 11:55 AM   #7
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Great info. Bookmarked!
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Old 05-02-2007, 12:00 PM   #8
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I look forward to reading this article. Maybe I can offer some additional insight afterwards since this is basically what my group does at work. I myself am more focused on external aerodynamics, but I'll see what I can potentially add.
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Old 05-02-2007, 12:04 PM   #9
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Quote:
Originally Posted by Braineack View Post
hmmm.
Yes we know you have an undertray and promote keeping them for cooling.
My car doesn't have one no idea where it is.
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Old 05-02-2007, 12:11 PM   #10
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glad I bought the air scooper in the bell kit.
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Old 05-02-2007, 12:49 PM   #11
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Good read, thanks for the link.

This info will help with the placement of the oil-cooler, as well as any venting I will be doing.

Needless to say it has been bookmarked.

(I to have the Bell scoop..... maybe a good place for a small oil-cooler ???)
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Old 05-02-2007, 12:55 PM   #12
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the NA undertray can fit the NB with just a little bit of snipping.

I'd be very surprised if the undertray helped cooling when the vehicle is stopped. I have absolutely no coolant overheating issues when the car is moving. I made something like ten consecutive ~14psi boosted runs from 2k to redline and the coolant never rose beyond 90c... but the car was always moving.
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Old 05-02-2007, 02:19 PM   #13
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Quote:
Originally Posted by hustler View Post
glad I bought the air scooper in the bell kit.
Hold the ******* phone.....you bought a turbo kit!!!!!!
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Old 05-02-2007, 03:06 PM   #14
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Quote:
Originally Posted by neogenesis2004 View Post
Hold the ******* phone.....you bought a turbo kit!!!!!!
good catch!
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Old 05-02-2007, 03:57 PM   #15
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Quote:
Originally Posted by neogenesis2004 View Post
Hold the ******* phone.....you bought a turbo kit!!!!!!
yes, and I'm trying to get the MSPNP deal lined up right now. I still need a rear end and a junk 1.8 to rebuild. I bought the s3 with all the bells and whistles...and the big intercooler with a gt2860rs.
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Old 05-02-2007, 04:19 PM   #16
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sweet!
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Old 05-02-2007, 04:22 PM   #17
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Quote:
Originally Posted by neogenesis2004 View Post
sweet!
I just hope the motor I build stays together. I'm paranoid.
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Old 05-02-2007, 04:24 PM   #18
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hmmm... are you sure that's the right setup for your car? :gay:
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Old 05-02-2007, 04:31 PM   #19
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Quote:
Originally Posted by m2cupcar View Post
hmmm... are you sure that's the right setup for your car? :gay:
considering my car is currently a 1.6...its not the right one, yet.
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Old 05-02-2007, 04:46 PM   #20
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Quote:
Originally Posted by m2cupcar View Post
hmmm... are you sure that's the right setup for your car? :gay:
haha

who's a bastard?

you are that's who!
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