What Have You Done To Your 2nd Gen Tacoma Today?

OZ-T · Dec 4, 2014

Atomic47 said: ↑

No, Escape from LA was the worst! lol
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Pretty much true , haha

BeaverYota · Dec 4, 2014

Atomic47 said: ↑

No, Escape from LA was the worst! lol
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Oh man.. yeah I forgot about that one

Hunter.V.White · Dec 4, 2014

1rooster said: ↑

This is why it is a bad idea to bypass your throttle body coolant line:

First, we need to make some assumptions. The first set of these assumptions deals with the operating condition of the engine. Let’s assume that we are running the engine at full throttle at 4,000 RPM. We have a 3.0L engine that is efficient and has about an 85% volumetric efficiency. Our effective engine volume is 0.85*3.0L or 2.55L. Since we have a four stroke motor, we are pulling in 2.55L of air 2000 times a minute. Therefore we are ingesting 3.00 cubic feet of air per second, after unit conversions. Our throttle body’s inside diameter is 2.5 inches (D) and its total length is 2 inches (L).

The second set of assumptions deals with the air and coolant flowing through our throttle body. Let’s assume that we are pulling in air from outside the engine bay on a warm day. Our intake air is 80 degrees, Fahrenheit. At 80F and 1 atmosphere, air has the following properties:

Density (p): 0.0735 lbm/ft^3

Thermal conductivity (k): 0.01516 BTU/hr*ft*F

Kinematic Viscosity (v): 16.88*(10^-5) ft^2/s

Specific heat (Cp): 0.24 BTU/lbm*F

Prandtl Number (Pr): 0.708 Unitless

Let us also assume that our coolant is 280F and that our throttle body is not cooled significantly by the incoming air. That is, the surface temperature of the inside of the throttle body is always 280F.

Now we will figure out how much and how fast the air is entering the engine. Through simple calculations, knowing the throttle body dimensions and volumetric flow rate and the density of the air, we can find out the mass flow rate and velocity of the air entering the engine. These values are found to be 794 lbm/hr (m) and 88 ft/s (V).

We now need to know if the flow of the air is turbulent or laminar. This will allow us to determine what appropriate equations to use later. First, we need to find the Reynolds Number (a unitless number that allows one to know if the flow is turbulent or not). This is found by the equation:

Re = V*D/v

We find our Reynolds Number to be 110,000. This is definitely turbulent flow! (Anything over 10,000 is defined as fully turbulent flow)

We need to find our entry length, or the length of tubing needed for the flow to become fully turbulent. This value is defined as Lh = 10*D. This value is found to be 2.08 ft. This is acceptable, since there is, most likely, two feet of piping between the throttle body and the air filter.

Since our entry length is less than our actual piping length, we can use Dittus-Boulter equation to determine the Nusselt Number (Nu):. (Sorry about all of this name dropping)

Nu = 0.023*Re^.8*Pr^.4 = h*D/k

We find our Nusselt Number to be 214. The ‘h’ value above is the average heat transfer coefficient. Now, we can actually find the temperature of the air coming out of our throttle body. Solving for h in the above equation yields h equal to 15.58 BTU/hr*ft^2*F.

By using Newton’s law of cooling, where the rate of heat transfer (Q) is determined to be:

Q=h*(area of heat transfer)*(Surface temperature-Medium Temperature)

By using differential equations, natural logs and some other hocus pocus, we get the following equation:

Texit=Tsurface-(Tsurface-Tinlet)*exp(-h*A/m*Cp)

Finally, by using the above equation, the outlet temperature can be determined to be 81.3 degrees Fahrenheit.

Now, using the SAE J1349 correction factor, you lose ~1% of your total power for each 10 degree increase in inlet air temperature. With this 1.3 degree increase, due to the throttle body coolant, you are losing 0.13% of your power. Or, on a 200hp car, you are losing 0.26hp. By overriding the coolant flowing through your throttle body, you are risking having your throttle body freeze open in cold weather (the whole purpose of running coolant through the throttle body in the first place). Hope this clears up any confusion.

Sounds like someone did their homework. Even after reading this for some reason I still want to do mine! Maby I just like doing mods
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This is an excellent use of fluid mechanics. Well done. Some people just see the world differently.

coveylane · Dec 5, 2014

MTopp said: ↑

You're in nova Scotia, I'm guessing they use a great deal of salt and grit during the winter when it snows. You should be coating your frame and entire underbody with rust preventive stuff, like fluid film.
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It has been undercoated since new.

coveylane · Dec 5, 2014

nad said: ↑

I'm going to assume being in nova scotia is a culprit to all the corrosion and rust?
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I'm going to assume Nova Scotia is not the only province or state where it snows and they use salt on the roads. At present there is a recall for Tacomas for frame rust in 20 colder US states where they use salt. I just had frame inspected on my US truck and although they found no problem, there are still sections they had to scrape and recoat (according to recall instructions). This was less than a week after I had it undercoated by Toyota.

and for the other guy X2

MTopp · Dec 5, 2014

coveylane said: ↑

I'm going to assume Nova Scotia is not the only province or state where it snows and they use salt on the roads. At present there is a recall for Tacomas for frame rust in 20 colder US states where they use salt. I just had frame inspected on my US truck and although they found no problem, there are still sections they had to scrape and recoat (according to recall instructions). This was less than a week after I had it undercoated by Toyota.

and for the other guy X2
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Well, that just plain sucks. Are you the first owner? Maybe you got a "lemon" truck

nad · Dec 5, 2014

darkfader said: ↑

thanks for the reply nad, and the headsup JRGMann. i just finished reading the two huge threads on heated mirrors and i think i will just go with the highlander replacement heated glass with the switch in the center under the HVAC controls and timer relay. i don't need the puddle lights and didn't want to deal with color matching the covers. this morning i REALLY wanted heated mirrors.
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You could probably use the covers that you have on your mirrors right now, I think they are the same.

Oregon TRD · Dec 5, 2014

Fiend13 said: ↑

I haven't seen Airplane in a long ass time! It is funny though
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Go watch this classic

BeaverYota · Dec 5, 2014

Oregon TRD said: ↑

Go watch this classic

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Try the Beatles "HELP" also. That movie is great

Fiend13 · Dec 5, 2014

Oregon TRD said: ↑

Go watch this classic

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You kidding me? I've had this on DVD since I first found it a few years ago. It's one of my favorites! Use to watch it on TV and VHS with my dad as a kid.

Oregon TRD · Dec 5, 2014

Fiend13 said: ↑

You kidding me? I've had this on DVD since I first found it a few years ago. It's one of my favorites! Use to watch it on TV and VHS with my dad as a kid.
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My uncle let me watch it when I was 8. I laughed all fucking day after seeing a dinosaur get nailed in the balls!!!!

Fiend13 · Dec 5, 2014

Oregon TRD said: ↑

My uncle let me watch it when I was 8. I laughed all fucking day after seeing a dinosaur get nailed in the balls!!!!
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That and the farting scene got me as a kid.

Oregon TRD · Dec 5, 2014

Fiend13 said: ↑

That and the farting scene got me as a kid.
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farting scenes......getting to you as a kid?.....NO WAY!!!!

Yeah...I think we had to hit pause because we were laughing so much at that too!!!

JustinFro · Dec 5, 2014

Bolted on the N-Feb removable steps for my sliders. The kids are very appreciative.

33harman · Dec 5, 2014

What kind of light bar is that? looks great! love the flag sticker.

cgchambers93 · Dec 5, 2014

33harman said: ↑

What kind of light bar is that? looks great! love the flag sticker.
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N-fab light bar

http://www.tacomaworld.com/forum/2nd-gen-builds/353187-superman-build.html

I have a similar set up.

T4RFTMFW · Dec 5, 2014

What flag sticker?

floodedkiwi · Dec 5, 2014

PeeRunner said: ↑

What flag sticker?
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X2?

Idaholandho · Dec 5, 2014

PeeRunner said: ↑

What flag sticker?
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I too, can not find Waldo

AWF ROWD · Dec 5, 2014

Oregon TRD said: ↑

Go watch this classic

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Barbara Bach = CroMagnonCumKnuckle....

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Products Discussed in Entire Site Forum: 2nd Gen. Tacomas (2005-2015) Thread: What Have You Done To Your 2nd Gen Tacoma Today?

#55381
OZ-T I hate my neighbour

#55382
BeaverYota Oregon State Edition

#55383
Hunter.V.White Well-Known Member

#55384
coveylane Well-Known Member

#55385
coveylane Well-Known Member

#55386
MTopp Professional bear handler

#55387
nad mmmm tacos!

#55388
Oregon TRD "GO DUCKS" Edition

#55389
BeaverYota Oregon State Edition

#55390
Fiend13 Well-Known Member

#55391
Oregon TRD "GO DUCKS" Edition

#55392
Fiend13 Well-Known Member

#55393
Oregon TRD "GO DUCKS" Edition

#55394
JustinFro Well-Known Member

#55395
33harman Well-Known Member

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cgchambers93 Well-Known Member

#55397
T4RFTMFW Well-Known Member

#55398
floodedkiwi Well-Known Member

#55399
Idaholandho The other white meat

#55400
AWF ROWD ...eats at the " Y " often....

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