Intake modification

gazz · 09-13-2007, 03:38 PM

I read about re-routing the air intake to pickup hot air off the exhaust. This is a bit extreme for me, has anybody made a more simple mod such as just removing the pipe from the air filter box so it picks up air from the engine bay which should be a bit warmer rather then a cold pickup from the front of the car.

Gary

gazz · 09-13-2007, 03:38 PM

I read about re-routing the air intake to pickup hot air off the exhaust. This is a bit extreme for me, has anybody made a more simple mod such as just removing the pipe from the air filter box so it picks up air from the engine bay which should be a bit warmer rather then a cold pickup from the front of the car.

Gary

subarutoo · 09-13-2007, 03:43 PM

Most people want to bring in cold air. There are all kind of kits for that for increasing vehicle performance (never seen a Prius kit). Why would you want to go against traditional wisdom, and bring in hot air?

subarutoo · 09-13-2007, 03:43 PM

Most people want to bring in cold air. There are all kind of kits for that for increasing vehicle performance (never seen a Prius kit). Why would you want to go against traditional wisdom, and bring in hot air?

patsparks · 09-13-2007, 04:17 PM

Faster warm up and better fuel atomisation. You may get a benefit, let us know how it goes if you try it.

patsparks · 09-13-2007, 04:17 PM

Faster warm up and better fuel atomisation. You may get a benefit, let us know how it goes if you try it.

David Beale · 09-13-2007, 04:29 PM

Most of this "mucking about with the intake" just upsets the car. The air intake is measured using a "hot wire" device. When you add a "cold air intake" you change the turbulence around the sensor, throwing it off calibration. Sure, you can get "more HP" at some engine speeds. You also get less at others.

You shouldn't need a warm air intake for a fuel injected engine. The main thing the hot air is for is to improve atomization, and secondly, to reduce icing. Usually the icing is caused by the fuel evaporation taking away heat. A fuel injected engine doesn't need this evaporation. The injector produces a fine spray right at the valve opening, so the fuel doesn't really evaporate or change much at all before it goes into the combustion chamber.

But go ahead and mess with it if you must.

David Beale · 09-13-2007, 04:29 PM

Most of this "mucking about with the intake" just upsets the car. The air intake is measured using a "hot wire" device. When you add a "cold air intake" you change the turbulence around the sensor, throwing it off calibration. Sure, you can get "more HP" at some engine speeds. You also get less at others.

You shouldn't need a warm air intake for a fuel injected engine. The main thing the hot air is for is to improve atomization, and secondly, to reduce icing. Usually the icing is caused by the fuel evaporation taking away heat. A fuel injected engine doesn't need this evaporation. The injector produces a fine spray right at the valve opening, so the fuel doesn't really evaporate or change much at all before it goes into the combustion chamber.

But go ahead and mess with it if you must.

bwilson4web · 09-13-2007, 04:32 PM

<div class='quotetop'>QUOTE(gazz @ Sep 13 2007, 02:38 PM) [snapback]512060[/snapback]</div>

Quote:

I read about re-routing the air intake to pickup hot air off the exhaust. This is a bit extreme for me, has anybody made a more simple mod such as just removing the pipe from the air filter box so it picks up air from the engine bay which should be a bit warmer rather then a cold pickup from the front of the car.[/b]

This one?

http://www.techno-fandom.org/~hobbit/cars/heatgames/

Bob Wilson

bwilson4web · 09-13-2007, 04:32 PM

<div class='quotetop'>QUOTE(gazz @ Sep 13 2007, 02:38 PM) [snapback]512060[/snapback]</div>

Quote:

I read about re-routing the air intake to pickup hot air off the exhaust. This is a bit extreme for me, has anybody made a more simple mod such as just removing the pipe from the air filter box so it picks up air from the engine bay which should be a bit warmer rather then a cold pickup from the front of the car.[/b]

This one?

http://www.techno-fandom.org/~hobbit/cars/heatgames/

Bob Wilson

09-13-2007, 04:29 PM	#7
David Beale Senior Member Join Date: Jul 2006 Location: Edmonton Alberta Posts: 2,105 My Car: 2007 Prius Model: Package: B Thanks: 3 Thanked 75 Times in 57 Posts Friends: 0	Most of this "mucking about with the intake" just upsets the car. The air intake is measured using a "hot wire" device. When you add a "cold air intake" you change the turbulence around the sensor, throwing it off calibration. Sure, you can get "more HP" at some engine speeds. You also get less at others. You shouldn't need a warm air intake for a fuel injected engine. The main thing the hot air is for is to improve atomization, and secondly, to reduce icing. Usually the icing is caused by the fuel evaporation taking away heat. A fuel injected engine doesn't need this evaporation. The injector produces a fine spray right at the valve opening, so the fuel doesn't really evaporate or change much at all before it goes into the combustion chamber. But go ahead and mess with it if you must. __________________ Edmonton Alberta "Pearl" is a 2007 Driftwood Pearl Prius.

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09-13-2007, 03:38 PM	#1
gazz Senior Member Join Date: Mar 2007 Location: Coventry, UK Posts: 202 My Car: 2010 Prius Model: N/A Package: T4 Thanks: 8 Thanked 2 Times in 2 Posts Friends: 0	I read about re-routing the air intake to pickup hot air off the exhaust. This is a bit extreme for me, has anybody made a more simple mod such as just removing the pipe from the air filter box so it picks up air from the engine bay which should be a bit warmer rather then a cold pickup from the front of the car. Gary

09-13-2007, 03:43 PM	#3
subarutoo Senior Member Join Date: Jan 2006 Location: Chatsworth, CA Posts: 1,176 My Car: 2006 Prius Model: Package: #6 Thanks: 0 Thanked 6 Times in 4 Posts Friends: 0	Most people want to bring in cold air. There are all kind of kits for that for increasing vehicle performance (never seen a Prius kit). Why would you want to go against traditional wisdom, and bring in hot air?

09-13-2007, 04:17 PM	#5
patsparks An Aussie perspective Join Date: Jul 2007 Location: Adelaide South Australia Posts: 9,035 My Car: 2004 Prius Model: N/A Package: Base Thanks: 108 Thanked 174 Times in 133 Posts Friends: 33	Faster warm up and better fuel atomisation. You may get a benefit, let us know how it goes if you try it.