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Old 04-05-2012, 04:02 PM   #21 (permalink)
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It allows airflow from hot or cold or both and is controlled mechanically, but could be controlled by stepper motor or choke type cable.

But if you are going to control it, you'd want to know the temp in the box

I know the Scangauge type devices have that ability, but the only cheap way i can think of to get it is from a digital temp probe

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Old 04-05-2012, 08:33 PM   #22 (permalink)
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I have a similar set up on my 2000 SC1. I did not have to insulate the airbox. I monitor the IAT with a scangauge. I normally see temps around 165บ to 185บ. Those temps occur after 20~25 minutes of my normal commuting, 60%"city" driving.
PS: Thriftee - there is another person doing a blend door setup on another site. Search for "cheapybob" ;>)
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Old 04-06-2012, 01:46 PM   #23 (permalink)
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Does this also work on carbs?
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Old 04-06-2012, 02:17 PM   #24 (permalink)
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You would need to reduce the amount of fuel to match the reduced amount of oxygen in the warmer air, but make sure it doesn't get too lean.

Maybe the venturi effect would do that by itself because the air would be thinner?

Or maybe it would appear to be running rich?

Do carbs have to be adjusted to feed less fuel for higher altitudes? If they do, then the same thing might apply.

I've never tried it or seen it tried...
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Old 04-06-2012, 03:05 PM   #25 (permalink)
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According to this, at least these Weber carbs need to be rejetted for high altitude...

OER Carb. 1 818 764-1901

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