Increase Bhp through Temperature Sensor?

[Kelpie]

Hi Bros,

 

Did you guys see those ebay advertisment where they sell a small little chip that plug to your temperature sensor or coolant sensor and claimed can increase Bhp by up to 20. I read that the technique used is simple, trick the car to think that temperature is cooler outside and enhance fuel mix ratio thus give rise to more torque and better pick-up. Anyone here tried? Is the result satisfactory?

 

Regards,

[Kelpie]

Anybody know about IAT sensor?

 

Thanks.

 

Regards,

[Hattee]

IAT sensor essentially is a thermistor. Its resistance changes from 3.5kohms at 20

[Kelpie]

Thank you for the information. Would the installation of such chip affect the car well being? May be game enough to try out for minor performance gain but is concern about the down side of such installation.

 

Regards,

[Genie47]

Don't try it. IAT hacks increase your fueling so it runs super super rich. The result is blackenened wet spark plugs among other things. Not worth the money. Performance gain is a lot actually but it runs rich all the time and there is no way to "turn it off" unless you remove the resistor.

[Kelpie]

1. Thank you for information sharing.

 

2. I thought ECU tunning also plays with IAT and other functions? This standalone IAT lacks the intelligence to self-adjust and do I take it that fuel consumption will increase alot?

 

Regards,

[Genie47]

IATs are self adjusting. but slot a resistor in-between to fool it for subzero intake temperatures and viola you get increased fueling. These hacks are nothing but resistor hacks.

[Maded]

The additional IAT resistor also causes the car to start super-rich... on my car manual, at -40C (the resisitor causes the car to think its starting at this temp), the cranking mixture is 1:1

 

For me that's 700cc of petrol just to crank the car.

[Anakin]

... the claimed improvement is "up to 20HP". in most cases, may be only a little bit ...

 

very common ploy by enterprising people in ebay, just buy a whole bunch of resistors & then selling for a few quids each, especially europe/UK. good profits!

[Hattee]

Again I won't pass sweeping statement that it definitely can't help in any car.

 

Out there some cars with electronics seem to suffer deteriorated performance in hot weather. Perhaps the ECU setting for IAT might not be exactly right, particularly those designed with little consideration for summer and humidity.

 

With a rheostat of 0-ohm, 250ohm, 500ohm and 750ohm, it unlikely will cause damage if the owner is familar enough with his FC and feel of his car performance. Worst case is potential fault code for minor pinging which the anti-knock picks up even before it happened.

 

Those got into problem usually went beyond 1000ohm.

[Genie47]

What the hell are you smoking? IAT hacks help? With this kind of weather you are going to screw the AFR bad. People in the US have tried it and it sucks. Wet blackened plugs. These things don't lean out, these things richen the mix. See below.

 

Most of these things have set the resistance to very high. That makes it run rich. You need a potentiometer to hack it run leaner by reducing the resistance. Air intake temperatures range from 35-45 deg C. eBay ones don't have any lower resistance. Then again fooling it to run too lean will have disastrous consquences and nobody can afford that because these cars are our daily rides.

 

If anyone wants to play, be warned. The second picture shows how I would hack it.

 

OK I will explain in more detail about this resistor hack. The IAT is a thermosistor. So hotter = lower resistance. So the best way is to use another resistor (higher resistance) to take some of the current to ground making it falsely read it higher.

 

To make it lean what you are going to need to do is find how to SLIGHTLY decrease resistance by that voltage into signal out. You will need a BIG resistor for this.

 

Forget these things. SAFC is better. It has maps.

Edited February 28, 2006 by Genie47

[Hattee]

We might disagree ... but for someone like you to speak like this

[Maded]

Second diagram is interesting... could rig it up to be controlled with the throttle... more throttle = richer, less or no throttle = stock.

 

But wouldn't the O2 sensor pick this up and adjust accordingly? Another idea would be to fool IAT, MAP and O2 sensor... but this is MAJOR hacking...

[Maded]

hmm i thought IAT hacks (aka chocolate chips) make the engine run rich, so no problems with pinging?

[Genie47]

The diagram courtesy of Erfinder@PrecisionBoost at Daewootech.com.

[Genie47]

I carry a big spiked club.

 

IAT hacks have been discussed ad nauseum for a long time because they are a staple of GMDAT automotive improvements.

 

Yes, the O2 sensor will detect these and you will get a CEL usually. There is no escaping the ECU.

Edited February 28, 2006 by Genie47

[Genie47]

You can reverse it to lower resistance for leaner mixes but there is a limit. Specifically called hole in your piston.

[Kelpie]

Aiya, he is like that one lah. I exchanged fire with him before. Usually, intelligent people are quite weird. Sometimes talk big but make sense one. Came to accept both sides of him here.

 

Regards,