Bills IAT sensor mod, reduce temp to 16* for $ 2.89 [Archive] - Cherokee SRT8 Forum

: Bills IAT sensor mod, reduce temp to 16* for $ 2.89


BuilderBill
03-11-2007, 03:02 PM
On the advice of my buddy (and new Hemi driver) Brad, I took apart the variable resistor we tested on the track Thursday that brought the IAT temperature down to a minimum of 43*. I tested the resistance of the unit and then purchased from Radio Shack ($2.89) a 50 ohm variable resistor (2711716) to replace the 10 ohm variable resistor. Hey if a 10 ohm resistor half ass works then a 50 ohm variable resistor should be the ticket. Results:

BEFORE
IAT = 106*
Ambient = 88*
Coolant = 210*

AFTER
IAT = 16*
Ambient = 88*
Coolant = 212*

Maybe someone can test it on the track before I do. Ok, I can see another track rental in the future.http://www.cherokeesrt8.com/forums/images/icons/icon12.gif
Bill

SRT8
03-11-2007, 03:16 PM
This looks good. I can't wait to see the track results.

GotStroke?
03-11-2007, 03:28 PM
That's what I'm talking about. Any SOTP difference?

BuilderBill
03-11-2007, 03:35 PM
That's what I'm talking about. Any SOTP difference?
Sorry...I don't understand SOTP (its not construction lingo)!

Black_SRT8
03-11-2007, 03:38 PM
Sorry...I don't understand SOTP (its not construction lingo)!



Seat of the pants?

Sex offender treatment program?

Split Option Training Platoon?

BuilderBill
03-11-2007, 03:57 PM
Seat of the pants?

Sex offender treatment program?

Split Option Training Platoon?
Funny, think I got it. I have not driven it yet, these were garage readings. I would not expect to feel the difference. On the track it is hard to tell the difference between a 12.85 and a 12.95 without looking at the time slip.

I believe that is is only the beginning of "lying" to the PCM through sensors.
Bill

GotStroke?
03-11-2007, 04:28 PM
LOL, the ass-o-meter, make sure you register with your local Sheriff's dept before testing;)

SRedrockT8
03-11-2007, 04:42 PM
what will a cooler air temperature reading compared to a hot reading make the engine computer do?

FastSRT8GC
03-11-2007, 05:32 PM
Should false the PCM to bump Fuel and Timing

gculver
03-11-2007, 05:44 PM
Should false the PCM to bump Fuel and Timing
The OEM ECM is already pig rich!

FastSRT8GC
03-11-2007, 05:53 PM
Should false the PCM to bump Fuel and Timing

I should say depending on the resistance value you use you could lean it out or richen it up.

BuilderBill
03-11-2007, 05:55 PM
The OEM ECM is already pig rich!
GC,
Using this software, how can I get the A/F readings?
http://www.autoenginuity.com/products.html

Bill

gculver
03-11-2007, 06:23 PM
GC,
Using this software, how can I get the A/F readings?
http://www.autoenginuity.com/products.html

Bill
Unless you have a wideband, You have to look at Long term fuel trim and short term fuel trim #'s. Ideally, they should be the same # value, but opposite signs(+/-). The IAT might change the short term fuel trim a little, but after open loop warm up, then it goes to closed loop operation(were the sensors come into play: O2's, IAT,MAPS,Coolant temp,etc. You are only going to get modest results from the resitor, it's best used when ambient temps are high( heat soak) and it starts to pull timing.

HoustonSRT-8
03-11-2007, 06:31 PM
In hot Texas weather, I'd worry about leaning out the mixture.

generalconfusion
03-12-2007, 08:54 PM
GC,
Using this software, how can I get the A/F readings?
http://www.autoenginuity.com/products.html

Bill

Here is a dyno sheet that speaks for itself how rich the A/F really is. Also the coolant temp effects. Hit the full size symbol up on the left corner to enlarge....makes it easier to read. Also on the upper right you will see the dyno difference between the Corsa exhaust vs stock. This was a back to back test I did last year. This should help dispell the B&B.....Corsa or brand Z rumors.

http://s77.photobucket.com/albums/j66/sgtstanko/?action=view&current=5.jpg

BuilderBill
03-12-2007, 09:33 PM
Here is a dyno sheet that speaks for itself how rich the A/F really is. Also the coolant temp effects. Hit the full size symbol up on the left corner to enlarge....makes it easier to read. Also on the upper right you will see the dyno difference between the Corsa exhaust vs stock. This was a back to back test I did last year. This should help dispell the B&B.....Corsa or brand Z rumors.

http://s77.photobucket.com/albums/j66/sgtstanko/?action=view&current=5.jpg
Great info General!

generalconfusion
03-12-2007, 09:41 PM
Great info General!

Your welcome.......I dont know if you could see the other files but I did several dyno pulls testing different X pipes and exhaust cores and thermostat temps.....open filters vs cai or no filter.......and i came to the conclusion that until we crack the ECU codes the potential of this motor is hidden.

GRNENVY
03-15-2007, 05:49 AM
This is an old idea that we tried back in 89-90 on the 5.0 mustang.There was really nothing out that helped these car except turning up the timing and lowering the fuel pressure with an adjustible regulator. So my My Brother in law being a computer nut and electronic wizard back then. We ran an adjustible resistor inline with the coolant and air charge temp sensor's. We made real nice kits that he actually sold and was tested by M/M magazine. It was called the STINGER. We did see a gain when adjusting/changing the coolant sensor resistance. The only problem he had was at that time Superchips and a couple other chip companys tried to sue him so he backed off. Also to get a pat. was almost impossible at that time when emission laws were crazy in PA. To sum it all up all it did was trick the computer into thinking it was colder out or hotter out then the computer would give it more or less fuel. Also on Fords it would change the timing + or - a couple degress.
Good luck

kpw70445
02-15-2010, 05:03 PM
where is the iat sensor on a 2006 Jeep Commander 5.7 ltr hemi?

SrtJake
02-15-2010, 06:02 PM
Holy ancient thread Batman!