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Old 05-28-2007, 10:49 AM   #1
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Default airflow in the NB

driving to north carolina with the AC on in hot weather .... the faster I go, the hotter she gets. cruising at 55-65 the temps are right around 210F. every 10 mph over means 10degF higher coolant temp.

Ambient was 87F...

note I haven't done anything about cold air intake or MUCH with airflow... I've got work to do there but I'm curious why faster = hotter.

I mean aside from the engine making more power to go faster... it's not like I was in boost or even approaching it. it was like... 15 inHg vac.
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Old 05-28-2007, 11:19 AM   #2
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that is strange..... Everything I know would tell me that the faster you go the better the airflow.... Do you have a lower engine sheild on???
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Old 05-28-2007, 11:19 AM   #3
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Same thing was happening tomy NA last summer with no turbo. Adding back in the undertray and front shroud thing helped a lot, as did removing the stupid grill that the previous owner had put on. I mentioned this to a colleague of mine in wind engineering, and he said that, in relation to wind on buildings, a screen acts more and more like a solid wall at faster wind speeds. So, in regards to a radiator, the same would hold true. The higher the speed, the more critical it is that air has no other way to go, other than through the radiator.
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Old 05-28-2007, 11:35 AM   #4
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I have the same problem. I also have sky high IAT's, because my filter is right above the radiator fan, like a old school fm kit..

I put the under tray back on, and that helped some, put a much lighter mix of anti-freeze in.. with water wetter, and a 160* t-stat.. we'll see how that does..

I still have no A/C, relay will be here this week so i can make that go.
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Old 05-28-2007, 11:41 AM   #5
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Hi cruising EGT?
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Old 05-28-2007, 11:42 AM   #6
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this is why FMIC's are evil
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Old 05-28-2007, 12:08 PM   #7
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Quote:
Originally Posted by magnamx-5 View Post
this is why FMIC's are evil
blah blah blah.
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Old 05-28-2007, 12:09 PM   #8
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Quote:
Originally Posted by jayc72 View Post
Hi cruising EGT?
12-1300 F max. runs well.

It's probably the gaps around the IC at high speed passing all the air. I tried to foam it in so air couldn't go around but I checked later and the foam was missing... air wanted by bad.

I have a makeshift undertray but it doesn't enclose the sides like the stock one. That's probably an issue too.

Ducting it is.
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Old 05-28-2007, 12:25 PM   #9
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yay for fun projects....
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Old 06-04-2007, 10:43 PM   #10
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Have you made any progress on this, y8s?

My f'in temp gauge started creeping up up up today.. running the heat got it back down to normal, but it's annoying for sure.

Edit: damn, you even have the Koyo.. I'm still stock.
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Old 06-05-2007, 11:15 AM   #11
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I've sorta made progress...

I ordered a 90° 4" tube and connector to mount the filter more behind the headlight.

I picked up some 3" shiny silver dryer hose. Gonna try to route this to a high pressure spot in a fender or something to get fresh air to the hole behind the headlight.

I picked up some rolls of PSA backed insulating foam weatherstripping. This will be sealing holes around the IC/AC/radiator.

I have not done anything with any of that... and I need to get some better sheet materials to make shrouds with. The stuff I got is flimsy and comes in roll form--oops. Next round will be thicker to get some rigidity. I may also form up a sweet filter box.

IDEALLY I will have a bunch of dividers/diverters that point the air only through some cooling device and not around any of them.
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Old 06-05-2007, 11:24 AM   #12
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I need to get some real thin gauge stainless or aluminum and cut some shields.. I have a CNC cutting table, but no sheet metal brake (break?) to bend the stuff.. I could make some kick *** air diversion panels with a brake.
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Old 06-05-2007, 11:38 AM   #13
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Quote:
Originally Posted by nester View Post
I need to get some real thin gauge stainless or aluminum and cut some shields.. I have a CNC cutting table, but no sheet metal brake (break?) to bend the stuff.. I could make some kick *** air diversion panels with a brake.
I have a vise brake...

http://www.amazon.com/Grizzly-H3243-.../dp/B0000DD4UU

But if you use thin AL and it's pretty big, just bend it over the side of your work bench...
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Old 06-05-2007, 11:40 AM   #14
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that's pretty neat.

We actually refer to our vise as the Amish Brake. We actually renamed the fabrication area from "Amish" to Mennonite, because we remembered that we have electric.
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Old 06-05-2007, 12:21 PM   #15
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This stuff is made for fab'ing shrouds/spoilers etc.
I've used it on numerous race cars, and on my street Miata.
Attached Thumbnails
airflow in the NB-shroud1.jpg  
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Old 06-05-2007, 02:23 PM   #16
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ooh sweeet. what's it come like? roll or flat? does it curl up when flat?
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Old 06-05-2007, 02:41 PM   #17
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it'll have a curl to it (manufactured as a roll) - but lay it out in the sun and it'll flatten right out
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Old 06-05-2007, 03:25 PM   #18
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that sounds pretty close to what I have actually.

by the way... 5.15 a foot or <$50 for 25 feet? wtf.
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Old 06-05-2007, 03:34 PM   #19
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found my front lip splitter material....

http://www.bsrproducts.com/product_i...roducts_id=518
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Old 06-09-2007, 12:10 AM   #20
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I bought a Koyo today.. be here next week.
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