Take a ristor that has about a .2k ohm resistance and plug it in to the plug that goes to the IAT sensor. the car will use less fuel. and still read a temperature that is in spec and wont throw a code. it worked for me. but since it leans out the fuel dont drive very hard it could be hard on the engine.

This post has been edited by TannerEsser: May 25, 2012 - 9:45 AM

it does work. Think about what the IAT is and what it is there for. The IAT is basicaly a resistor that changes resistance as the temperature changes (which it shouldnt change too much once the car is warmed up, for me normally the air is about 87 ferenheit) the car takes this reading from the IAT and changes the fuel mixture based on the temp. Cold air is more dense and needs more fuel to burn more completely, hot air is less dence and uses less fuel. if you trick the reading of that IAT sensor and say make it run as if the IAT is 120F (still an acceptable reading) the car will use less fuel and will get beter mpg. when i messed with mine i used a potenciometer , or a variable resistor, and a scan tool to find the exact temp i wanted my car to read. This does work. ive driven around all week on a quarter tank of gas.

Yeah I would never do that. Rather not risk the chance of blowing up my engine.

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you dont pick a random tempature you go on all data and pick a temp from the aceptable temp reading chart. pretty simple you wont blow up. just saying


http://library.alldatapro.com/alldata/LIB~...857031/34857037

look at the chart. idk if you have acess to all data but if you stay within the exceptable range you will have no problems. you have had 5 cars for parts? ive been running like this for a while with no problems at all and i have one car. i never needed a parts car, idont **** my **** up.




This post has been edited by TannerEsser: May 25, 2012 - 10:57 AM

you actually want to reduce the resistance (not increase it) to fool the ecu that it's getting hotter air and make it run leaner.




running leaner will just reduce your power output but unless you change the way you drive (ie. driver demand on engine power) you're actually gonna use more fuel. it can also cause the engine to run hotter and possibly scorch the internals.

there are much better and safer ways than this to improve the fuel economy, imo.

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well .2k ohms is reduced. thats what i said. but if you drive like a normal person you will get better mpg. but like i said there is specifications that need to be taken into acount. but after i put the POT in i hooked up my scan tool everything remained normal, no irregular readings from the O2 sensors the engine has been running fine. ive just noticed i dont have to fill up as much and less fuel gets me further. so ya i dont know where you guys heard the stuff you heard but this is probably the easiest cheepest, and still safe way to get better mpg. a more drastic change and way more harmful way of changing how much fuel goes to the engine is doing the same thing as i did to the IATsensor to the engine coolant temp sensor. doing it that way is pretty bad.


ALSO i never said have more resistance to have less fuel. and nice chart. i posted the same one in a link in the post before you.

This post has been edited by TannerEsser: May 25, 2012 - 11:12 AM

I'd like to see the numbers, how many miles and how many gallons for before and after. Simply saying "it seems like less fuel takes me farther" won't win many people over. I check my mileage every single tank and I ran a resistor for a few months. It made 0.000000% difference with my car, but every car and every driver are different.

Our engines run lean to meet emmisions already. You want it richer not leaner

I'll stick to coasting whenever I can to improve mpg.

In before the "Where to buy a 5s" Thread.

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I dont know which was funnier, reading that or reading your signature immediately afterwards
XD

with no change in the engine or electronics my mpgs has ranged from 21mpg to 34mpg.

mainly how hard i drive, ac usage, ambient temp, traffic, average speed, etc.

how to get better mpg...
drive slower.
replace your o2 sensor
get a free flowing intake/exhaust
do a full tune up
lower your car, sideskirts, etc
skinnier or less grippy tire (negligible)


do those and i cam almost promise you will gain 5-10 mpg, depending on where you started

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If you run the resistor in parallel with the IAT sensor it will reduce the resistance, depending on the IAT resistance range and what resistor you pick. 1/(Resistance Total) = 1/(R1 IAT variable)+1/(R2 resistor you pick)



That said, i'd be shocked if it made any noticeable difference. Do what Stephen_lee said you'd be better off.

This post has been edited by czwalga: May 30, 2012 - 8:06 AM

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but all that cost a lot of money....... but a potentiometer is like 3 bucks haha i have noticed a difference in mpg on low resistance and a difference in power at a higher resistance. it reads 55degrees F for higher resistance and 120 for lower resistance(122 to be exact haha). but i don't care to much i just thought it was a fun little trick to try out. my tech instructor has one on his stock eliminator car. he uses it so he gets better mpg when pitting and not racing and docking around idk but he uses one lol.

I started at 24 and am up to 29 with AC on, and it didn't cost me anything additional either...I just fixed a bunch of the broken stuff on the car. I needed struts, so I lowered it on Teins and KYBs. I needed tires, so instead of 205/55, I went 195/65 and aired them up to 42. I needed a tune-up, so I went to Toyota and bought the right parts. When I do my exhaust, I will go 2.5" with as little restriction as possible, only enough so I don't kill the car.

I used a resistor before I got e-manage...but it was for more fueling with my mods. Those 294s sing when you rev.up to 7200rpm on a modded ECU haha.

I should also mention that I drive no less than 90 unless my daughter is in the car, then it's 65. My speedo is als 5% off now, so my 29 is probably closer to 31. Oh well, it's all good.

I thought the gas-pedal, and general maint was the key to good MPG?

the biggest thing you can change to improve gas milage other than getting another engine/car is how you drive it. and thats free:)

checkout ecomodder. gives good ideas if youre really that into it.

Fail thread. O2 corrects mix to its "optimum". I've been on an uberquest to get moar mpgees. Driving 55 everywhere. Just went on a 700+ mile trip and got nearly the same mileage at 70-80 as I did going 55.
I just finished an Auto-RX regiment and am now on Mobil1. I'll post results later. Tires (195/70/14) at 42psi. Front and rear smooth underpanels. I've got 350 miles to drive tomorrow, so we'll see what the mileage is.
Do go to ecomodder. Its neat stuff WITH tests/results.

quick edit: http://www.fuelly.com/driver/robbmeex/celica

This post has been edited by RobbMeeX: Jun 1, 2012 - 10:09 PM

Reminds me of those ebay "power chips" from back in the day...

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^^^Exactly what i was thinking.

or just take the sensor out and zip tie it to the coolant elbow lol

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unless its in spec. the scan tool said it was fine from the start up..