Need another reason for a snorkle?

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How about an average of 30 deg F reduction in intake air temp? That's what I found when comparing my truck (w/snorkle) to a friends truck (w/o snorkle). The data on the air temp was taken using the intake air temperature (IAT) data from the OBD2 port. Hwy speeds were 55-70 and city was 0-45.

Ambient temp: 95-97 deg F

My truck 95 w/snorkle
Hwy IAT: 106-111 deg F
City: 115-126

Friends truck 97-no snorkle (factory air intake)
Hwy IAT: 127-140 deg F
City: 147-156

Highest temps for both trucks were when we were stopped in traffic. The only difference in the 2 rigs is that his coolant temp (as measured by the OBD2) is about 5 deg higher than mine, which could result in some increase in the IAT.

Bob
 

Biff

 
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Hey thats a real good reason, I'll have to save it just in case the wife wants to know why I'm installing a snorkle. Now I don't feel so bad dropping $250 for my safari snorkle.
 

turbocruiser

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Great info, I'd love to see a before and after temp comparison when a snorkel supplies an intercooler's air. Not only would there be the slight "ram effect" of the snorkel (at speed) but there would be the slightly lower temp level to start with. Currently my rig breaths from the stock location and I would love to do two things to make the intake charge cooler. First is meter the heat to the throttle body via valves within the bypass coolant lines and second is add the snorkel. Thanks also for the link to the obd-2, I'm gonna havta get one of those things. If I do, I'll do a before and after with pre-snorkel, then snorkel, then the stock fully heated throttle body, then the modified and metered cold throttle body for summer and heated throttle body for winter. Again, great info, thanks. :cheers:
 

turbocruiser

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EDPA said:
So whats the benefit of lower the temp. ? Will It increase my gas mileage?

A few benefits from the top of the old head here (other experts please expound)...

The colder the air, the denser the air...

The denser the air, the more oxygen within the air ("air" being a mix of gasses including oxygen as well as nitrogen as well as other things)...

The more air, the more fuel to go with it...

The more air & fuel, the more power!!!


HTH, :cheers:
 
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EDPA said:
So whats the benefit of lower the temp. ? Will It increase my gas mileage?
Good question. I don't know that anyone has determined the answer to that. In theory, at least in hot weather, there should be some improvement. I do know that these 2 rigs get almost the same fuel mileage in mixed city/hwy use and the 95 is probably 500-600 lbs heavier and is running MT tires, vs. ATs on the 97.

Bob
 

cruiserdan

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Lower air temp is very desirable, think intercooler. Of course a snorkel is not an intercooler but 30 degrees is 30 degrees. When you are force-feeding air via a blower or turbo every little bit matters.
 
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cruiserdan said:
I told ya so.............:flipoff2: two years ago. Of course I did not have the hard numbers.....:whoops:
Yessir, that you did. I found that post while I was searching to see if anyone had done this analysis before.

Bob
 
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Turbocruiser, go out to yourrig and use a coolant bypass hose to bypass the throttle body, no sense and preheating the air with the throttle body heater. No scientific data like Dan said but I did it anyway just thinking that evey little bit matters.
 

turbocruiser

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Rainy Day FZJ said:
Turbocruiser, go out to yourrig and use a coolant bypass hose to bypass the throttle body, no sense and preheating the air with the throttle body heater. No scientific data like Dan said but I did it anyway just thinking that evey little bit matters.

I cannot simply bypass, I live in Colorado, I have to have a way to meter the flow from completely bypassed in the summer to at least some flow for winter. I've been imagining using the rear heater controls from the 1st Gen 4Runners inserted into the line somehow so that I simply select the amount (from none to some) as appropriate. Thanks though. :cheers:
 
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30F, That is a lot, there has to be a way to improve the intake temp without cutting a big hole for a plastic pipe in my fender.

Colder air will not notably improve gas milage and very well may decrease it, but colder intake air will increase available power and help with detontaion/pinging/knock.
 

Gumby

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Rainy Day FZJ said:
Turbocruiser, go out to yourrig and use a coolant bypass hose to bypass the throttle body, no sense and preheating the air with the throttle body heater. No scientific data like Dan said but I did it anyway just thinking that evey little bit matters.
There is a lot of reason to heat the air with a throttle body heater. Cold fuel does not atomize as it should. It works in the cold weather. It doesn't make any difference one way or the other in the hot when the intake is going to heat the air above coolant temps anyway.

that's my thoughts anyway.
 
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In the average production gasoline engine every 11 degree drop in intake temperature is worth approx 1 hp. this is the equation that most manufacturers use to come up with intercooler sizing for forced induction vehicle (super or turbocharged)
 
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