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daffydak
GenIII
 
5/02/2004
12:32:31
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 Subject: iat sensor ?s
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Message:
I have heard about relocating your iat sensor, to your air intake tube. I just wanted to know, what are the benifits of this? my dak runs awesome when I first start it (snappy throttle, spins the tires without trying etc) But when it warms up, it runs like a dog (better than stock though) Would relocating the iat help, or does the colder engine have more to do with this?
I know colder fuel is more dense, maybe thats why it runs so good.
Thanks for the help :-)
Dan
mopar=mopower
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TOMZ
Dodge Dakota
JOIN HERE
5/02/2004
16:04:53
|  RE: iat sensor ?s
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Message:
Hi,
When you reloctate the IAT you LET the computer get a more accurate reading of the intake air temperature. When the sensor is in the manifold it works more like a heat sink and reads the temperature of the manifold, not the incoming air.
If you look up a few of the posts on this you'll find one where Larry made up a simple adjustable device for tricking the computer into reading various air temperatures. It even had an on-off switch wired into it! This thing works great! Just don't get too carried away with it or you'll really drop your gas mileage. (personal experience) Just play with it a little and you'll have great power all the time and good mileage.
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daffydak
GenIII
5/03/2004
00:46:05
| RE: iat sensor ?s
IP: Logged
Message:
thanks, I will look into that on my next day off. hopefully, it will make my dak run as good as she does when shes cold!!!
Dan
MOPAR=More Power!!
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daffydak
GenIII
5/03/2004
11:54:48
|  RE: iat sensor ?s
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Message:
I think I have an idea!! Just go out in the morning, and measure the iat sensor's resistance. Then drive to radio shack and buy a resistor with the same value :-) that way, it will always tell the pcm its cold...
Just an idea, feedback will be appreciated!
thanks.
Dan
MOPAR=More Power!!
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wadak1234
Dodge Dakota
JOIN HERE
5/03/2004
12:45:13
| RE: iat sensor ?s
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Message:
Daffy, Here is a list of temp vs resistance from the 97 factory manual.
32deg. 29,000 to 35,000
50deg. 17,990 to 21,810
68deg. 11,370 to 13,610
77deg. 9,120 to 10,880
86deg. 7,370 to 8,750
104deg. 4,900 to 5,750
These thermistor used to read temperature have a negative temperature coefficient. As you can see as it gets hotter the resistance drops in value. Like you, I went to Radio Shack and bought a package of resistors and experimented with them to find the best value for me. Where I live in Washington State, in the Puget Sound the temp. generally varies 30 to 45 degrees. I found mine ran best at about 32 degrees. I ended up using a 33,000 ohm resistor. I just disconnected the plug from the IAT, bent the resistor leads in half plugged it in and covered the connector with electrical tape to prevent it from shorting out.
I am now running a Jet stage 2 chip which drops the temp to the ECU about 30 to 50 degrees.
I have another idea that might work the same as the Jet chip: Wire two IAT sensors together in series, it would in effect double the resistance for each temperature sent to the ECU.
For example if your sensor was seeing a temperature of 68 degrees the resistance value would be approx. 12,000 ohms. Add a second IAT in series and that resistance value doubles to 24,000 ohms, which would equal about 40 degrees. According to Larry in an earlier post this is how the Jet chip is making extra power by dropping IAT temp. values 30 to 50 degrees, so the computer is advancing the timing and giving extra fuel. I would pick up an extra IAT at a salvage yard and try it. Some Dakota's run fine with the IAT relocate some don't. Anyway these are more own thought's, try it if you like and see if it works for you.
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xmr
GenIII
5/03/2004
13:26:36
| RE: iat sensor ?s
IP: Logged
Message:
My iat solution was some what simpler. I bought and extra iat sensor from AZ and mounted it in the air hat. I did not have to do any rewiring and i can change back and forth from stock to the relocated one. When I run my relocated iat I get better city mileage and loose about 1 mpg on highway mileage. most Dakotas seem to react differently to this mod.
'98 cc auto /Home brew cold air with K&N,Dynomax, Superchip Tuner, 1.7 RR,, F&B tb. NAPA cap and rotor, 3923 plugs,tps mod,relocated iat, 180 t'stat, Crankshaft sensor mod.,PVI
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daffydak
GenIII
5/03/2004
14:03:26
| RE: iat sensor ?s
IP: Logged
Message:
thanks!! i was aiming for about 40-50 degrees. thats what I figured the sensor read, from the cold intake. also, maybe insulating my fuel rails and intake tube might have a positive effect.... as ong as i dont lose too much mileage :-) i have a jet stage 2 and it dosent seem to do anything for me.
ah well, in a perfect world my 3.9 would run 12s!!!!! LOL LOL
thanks!!!
btw, XMR. Is that an old school clear fuel filter inline with your pcv valve?? i thought of something like that, but i never thought it would work. does it really work to cut down on the oil going to the intake?? (not really a prob on my dak, but every bit helps)
thanks again!!!
Dan
MOPAR=More Power!!
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xmr
GenIII
5/03/2004
17:09:38
| RE: iat sensor ?s
IP: Logged
Message:
Dan:
Yes it is just a clear glass fuel filter from AZ I put it in to see if I was getting any oil from my valve cover to the intake. I was not but it does catch some gunk so I left it. I read about it on some other board. My dak started using a quart of Mobil 1 every 700 to 900 miles after I installed my crower 1.7 roller rockers. I have come to the conclusion that it must be my valve seals since I have not found any other explanation. The truck runs real good so I hate to mess with it.
'98 cc auto /Home brew cold air with K&N,Dynomax, Superchip Tuner, 1.7 RR,, F&B tb. NAPA cap and rotor, 3923 plugs,tps mod,relocated iat, 180 t'stat, Crankshaft sensor mod.,PVI
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daffydak
GenIII
5/04/2004
10:59:12
| RE: iat sensor ?s
IP: Logged
Message:
ok thanks, I will mess around with it. its not like I can hurt anything (except mpg and my tires lol)
I like the idea of screwing it into the airhat, I think I will try the resistor project first. Maybe a rheostat, to vary resistance (make my own iat adjuster) and stuff it into the glove box...
many thanks!!
Dan
MOPAR=More Power!!
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daffydak
GenIII
5/07/2004
11:38:51
|  RE: iat sensor ?s
IP: Logged
Message:
update;
i bought a pack of 33k rsisitors to try. i put them in, and drove until it warmed up. it ran much better, now to see what it does to my milage lol...
my next off days (weather permitting) i'm going to rig up a way to insulate my fuel rails. with what, i dont know. sounds like a trip to lowes is in order! also i'm going to insulate my air intake tube. (ideas on material to buy??)
thanks for all the info you all have given me!!
Dan
MOPAR=More Power!!
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J and J Auto
GenII
5/07/2004
17:23:15
| RE: iat sensor ?s
IP: Logged
Message:
Nordask Air/Fuel guage and a IAT adjuster and you
can tweek your fuel ratio for conditions
$99 at summit racing and it will work on exsisting
4 wire o2 sensor
reading a colder temp will advance timing and dump
more fuel
14.7 for crusing good gas mileage
13.0 power ratio
This is how I do it on my stroker motors
Jet 2 will lower reading aprox 30 to 50, a
relocate to air tube about a foot from TB will
read around 90 degrees
50k pot
1k ohm resistor
dpdt rocker switch
and a project box
Do a search I have all the radio shack part #s
listed somewhere, you need to run 4 wires out
2 to comp side and 2 IAT than you can either run
the adjuster or orig IAT
Larry
J&J Auto
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daffydak
GenIII
5/08/2004
02:01:29
| RE: iat sensor ?s
IP: Logged
Message:
back from vacation eh?? hope you had a blast!!!
thanks for the help, i'm going to look into building my own adjuster. stuff it into the glove compartment, to keep it from getting bumped...
thanks again
Dan
MOPAR=More Power!!
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davin
Dodge Dakota
JOIN HERE
10/20/2008
17:59:07
| RE: iat sensor ?s
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Message:
where exactly is the iat sensor? please!
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trev1
Dodge Dakota
JOIN HERE
10/21/2008
17:20:35
| RE: iat sensor ?s
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Message:
Ive got to try this out. Sounds like it should work. GREAT IDEAS.
Trevor in SWMO
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J and J Auto
GenII
10/23/2008
00:23:10
| RE: iat sensor ?s
IP: Logged
Message:
one thing to watch out for is when it reads under
50 degrees it will trip a code IAT sensor voltage
to high
The IAT adjuster works great a relocate in cold
cimits don't get to far away from the motor or
it will read to cold and trip the code
reading around 75 is good mine with the hood scoop
below 0 I have to switch to the stock location
done with a switch in the cab
I got a project box from radio schack and put
4 rocker switches in
IAT stock or relocated one
fan relay manual on
fan thermo switch ground on off
Lockup off
so I can run my trans in 4 setups
3 speed
3 speed lockup
3 speed o/d
or normal
great for racing
the o/d off switch you already have but it will
still lockup around 45mph having the ability to
shut down lockup is nice
It pays to experiment with these things every
truck is a little diff
Larry
J&J Auto
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Sheila Suydam
Dodge Dakota
JOIN HERE
6/04/2011
17:20:05
| RE: iat sensor ?s
IP: Logged
Message:
where is it located on my 2004 V-6 dodge dakota?
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WiseOne
Dodge Dakota
JOIN HERE
6/07/2011
18:38:58
| RE: iat sensor ?s
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Message:
A buddy of mine is a certified Dodge mechanic.
He said it is not wise to do this.
All computer calcalations are done based on the IAC being in the manifold. They put it there for a reason.
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daddio
Dodge Dakota
JOIN HERE
6/08/2011
08:47:00
| RE: iat sensor ?s
IP: Logged
Message:
"They put it there for a reason."
Yes, and the reason is driveability and reliability for the masses. It may work better when it is relocated on a truck by truck basis. Anythiing that is mass produced are not exact copies of each other. There will be subtle differences in performance in every single vehicle. Even if they are equipped identically.
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