Posted: Sep 07 2007 at 6:43pm | IP Logged

as it turns out nissan decided to run a coolant line through the throttle body of the nissan frontier, this coolant is hotter then the outside air, so air actually gets heated as is passes through.

a guy on the titian forum adjusted the timing on my truck and he made me aware of it,

all you have to do is get an inline hose connector and join two of the coolant hoses in the throttle body together so that fluid passes by the throttle body and into the engine. this should lower engine temps. if you live in a colder climate you should not do this mod,

my frontier is running at 201.2 degrees, i'm going to do this mod and repost my new temp. should make a 5-6 degree difference.

again i have a picture of this but my pics are too big, i don't know how to down size them

Posted: Sep 08 2007 at 11:54am | IP Logged

now all ya gotta figure out is how much that 5-6 degree in air temp correlates into density increase in air charge to determine what kind of gains you will see :)

that'd be interesting to note

Posted: Sep 13 2007 at 6:55pm | IP Logged

its more like 10-12 degrees equals 1 hp over its ideal atomising temp... as far as the cold idle, as far as the cold idle valve... thats not correct that sensor is located off the plenum its self not the throttle body. ...

its a truck... not a super car, it will never run 9's and it most likely will not climb the steapest hill... if you want better gas milage just get an intake... the cat back will encurage the use of more air, which by default causes the motor to use more gas... no matter what your truck will need the same power to drive, weather thats more or less required throttle pressure... responicble driving habbits are realy the only way to get good mileage. But power =  lots of gas, lots of air, and the ability to breath it, and feed it.

Posted: Sep 13 2007 at 9:54pm | IP Logged

you've got it all twisted, with the addition of my exhaust i gained 1.6 mpg. thats according to my trucks digital display. and the air temp entering my engine was 164 deg f, the coolant (201 deg f) heats up the air entering my engine, so it is robbing power. its not as simple as 10 deg = 1hp, its not proportional like. its relative to quality of gas you use, low octane and high octane have different burn charteristics. besides if its good on gas its no fun.

unless you live somewhere where the ambient temperature is 164 deg then your arguement makes no sense, it basically eliminates the CAI.  i'll be doing this mod while i dyno my truck next month. i'll post the results.

colder air into the engine is more power out.

Posted: Sep 14 2007 at 8:31am | IP Logged

Hmm... let me see if I can explain more clearly. If I have 1 gallon of water at 90* (ambient air temp) and I have a hot line running through the water. It will take that water quite a while to warm up 10*... lets say 1 hour. Now lets make it more simalar to an intake, where the water is moving quickly. I cannot heat each gallon 10* in 1 hour if the water is constantly being cooled by fresh water.

Like the water, the moving air is constantly getting cooled by fresh air.

Also, if you can produce more power with an engine, and keep all other things equal (drag, driving habits, etc) then it should be more efficient as well. It will be able to handle things with a much lower load, which (to a point) = better efficiency.

Posted: Sep 14 2007 at 1:44pm | IP Logged

i agree with your comments, they make sense.

but its not gas milage i'm looking for. i'm trying to push my truck to get max power, i am sure i'm taking life away from the vehicle but these trucks are vary capable of handling it.

engine temperature is 201* in these trucks, i'm going to do what i can to get that number down, just by altering the coolant to water ratio in your radiator you can sinificantly lower your engine temp.

lower temp = more power

Posted: Sep 14 2007 at 3:34pm | IP Logged

A vehicle in good condition will operate well be low the thermostat controlled temperature with a 50 - 50 anti freeze mix.

With the American government giving car manufactures a hard time about fuel economy (CAFÉ) it would seem the manufactures would simply install 160 degree T-stats and larger radiators for more power per gallon I.e. better fuel mileage.

... I thought the Cold air intake was good because there is more oxygen in a cubic foot. The hot engine (200 + degree operating temperature) vaporizes the mixture for better efficiency. Also the modern multi-viscosity engine oils are designed to operate at these higher temperatures.

If something I’ve posted on the Internet offends you please ignore it.

If you don’t know how to ignore something on the Internet e-mail me … and I’ll demonstrate.