Intake Air Temperature sensor add 20 bhp

rdk12

New Member
Joined
Aug 22, 2003
Messages
6
Location
bournemouth
Car
Sl 300-24 1993
If this has already been spoken about on the forum could you send the thread?
Came across a topic on the web, how to increase your bhp with out remapping or chipping the ECU. This little devise is a piggyback box containing a resistor; it connects to the Intake Air Temperature sensor. Basically adds resistance to the wire, which fools the ECU into thinking that the air temperature is colder than it really is. The ECU then changes the fuel air ratio and timing, which increases output by 10 - 20bhp. It all sounds very good and takes allegedly 10 mins to fit and costs less than £5 for the resistor.
Firstly where is the IAT sensor? (model r129) SL 300 – 24 1993.. Is it mounted on the air-duct between the grille and the air filter box just before the paper filter? It has two wires No 1 and No 3 these wires then appear to go to another sensor under the air filter box (inlet manifold) where there is another possible sensor with wires repeated No1 No 2 No3 And if I was to buy said resistor which wire should I interrupt (add extra resistance too) Most importantly what do you technical guys out there think about the idea ??
:cool:
 

Stratman

MB Enthusiast
Joined
Jun 15, 2003
Messages
5,054
Location
Sunbury
Car
W203 C200 CDI '04Estate
It's only a guess, but if you make the Microbrain think that the air is colder than it really is, it will increase the amount of fuel injected into the engine. Cold air is denser than warm air, and so needs more fuel to maintain the correct air/fuel ratio (lambda). However, you have 'fooled' the ECU so will be running a rich mixture. This will a) fail the MOT on emissions and b) knacker the catalytic convertor. Cats need a very precise lambda to work properly, and an excess of fuel will ruin them.

Sorry to put a damper on it
DD
 

jack-n-gill

New Member
Joined
Jul 31, 2003
Messages
16
Location
North Norfolk
Car
MB 190 2.0/ Suzuki Vitara
If it sounds too good to be true then it probably is!!!

MB spend millions on research and development to make their vehicles as good as possible, so five quid on a resistor sounds TGTBT-hence £5 resistor=£100's of pounds cat = £100's pounds out of pocket.
If you want the extra oomph just put your foot down harder. This will put more fuel into the engine as it was designed.
There are loads of "electronic" tweeks about but has there been the R&D to ensure longevity and compatability?
 

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