03-29-2019, 07:29 AM
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#1 (permalink)
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EcoModding Lurker
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Cold Air Intakes
Are cold air intakes worth buying? Do they really improve a vehicle's fuel efficiency and horsepower?
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03-29-2019, 07:39 AM
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#2 (permalink)
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Master EcoWalker
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You can do a custom search (top left of the page) before you ask a question.
Almost anything efficiency related has long been discussed and tested over here, so searching it out first helps preventing tons of threads about the same thing.
No, cold air intakes are generally bad for efficiency. Instead we fabricate our own hot air intakes or use grill blocks, which tend to raise under hood temperatures which also increases air intake temperature.
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Last edited by RedDevil; 03-29-2019 at 07:48 AM..
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03-29-2019, 10:02 AM
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#3 (permalink)
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Corporate imperialist
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Only in a diesel.
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03-29-2019, 11:17 AM
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#4 (permalink)
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Somewhat crazed
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Only in a boosted diesel because boost equals heated intake. Not boosted diesel engines prefer warm also
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03-29-2019, 11:27 AM
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#5 (permalink)
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Corporate imperialist
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When my diesel was non turbo I found it got +2 to +3 mpg when I restored the cold air during warmer temps.
When it was well below freezing warm air was better for +1 to +2mpg.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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The Following User Says Thank You to oil pan 4 For This Useful Post:
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03-29-2019, 11:59 AM
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#6 (permalink)
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Somewhat crazed
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Yeah but it is a density thing not a vaporizing thing like on gasoline. Cold air gives more compression which increases efficiency. Warm air increases vaporizing efficiency. Warm engine, cold air is best of both for diesel. 250 is happiest AFTER it starts on winter day
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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03-29-2019, 02:25 PM
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#7 (permalink)
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Master EcoModder
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Quote:
Originally Posted by sneakerhead04
Are cold air intakes worth buying? Do they really improve a vehicle's fuel efficiency and horsepower?
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Yes on horsepower, no on efficiency. |
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05-21-2019, 02:03 AM
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#8 (permalink)
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EcoModding Lurker
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Others bought a CAI to improve the sound of their engines.
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