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They do not give more power. They are more likely to loose it, but something like the Viper will not loose horsepower as it is very nicely shielded and may improve throttle response marginally.
You do NOT need a re-map after fitting an induction kit. If the car is getting more air, the ECU simply moves to a higher load site and adds the proportional amount of fuel.
Dust: If you kept stalling then you probably did something wrong. You can drive a car without any filter at all.
I understand that the lambda sensor in the exhaust reads the emissions and the ecu then alters the fueling to compensate for the extra volume of air....but only up til 3K revs. After that the ecu relys on static maps already programmed in...so hence the remap.
After I fitted mine and the K-tec, it rollered at 158bhp!!!! fueling was way out...20mpg!!! remap not only sorted the fueling and Co2 but it now has 180bhp!
Chris 172 i am hoping to really develop the motor and take it in stages little at a time, I want to get over the 200bhp with a series of mods and the chip and the head work. I know it is a bit expensive through LAD but from past experience with dodgy back alley garages quoting big figures and then my engine blowing up i would rather spend the extra and get a decent job. Once i have the smaller mods in place i will start to think about the TBs
throttle bodies will give you straightoff larger increase than playing with the head and supposed cam timing like LAD do. The std throttle body size is tiny and wont really allkow you to comfortably push 200bhp.
A set of quad items helped us to 215BHP on std cams and head.
My point is that the car has an airflow sensor. This sends a signal to the ECU to tell it how much air is being introduced, and the ECU in turn looks up the relevant load site at the current RPM and applies the fuel and ignition setting. Simple!
If the car is getting more air, the ECU will simply look to the relevant air-intake point, and apply the correct fuel settings.
The image below is a map for a Lotus Elise. You can see that the engine speed sites go across the screen and the load (airflow) sites go down the page. In the image the airflow is very small (as throttle is fully closed) and the engine is at idle.
If the car was getting loads of air, but still at 1000rpm, the load site position would be down somewhere like 10 or 12.
I hope you can now all see how the ECU is compatible with an induction kit that flows more air. Any questions?
Oh and when you sober up , could you explain "the difference between theory and practice" with regards to the running lean business and what I have stated as my knowledge on engine management goes only a little further than that book does.