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Q: De Tuned on 2003 Mercedes-Benz SL55 AMG

when my car gets hot the engine performance is retarded ? not overheating
engine management retards, or super charger not switched on ? about 50% of the normal power ?
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You said that this only occurs when the car is hot? If so, it could very well be a problem with the intercooler pump. If the car senses that things are getting a bit warm, it will retard the power. It would be worth checking out at least.
$ 1200.00 For an IC pump ? Thats a total rip off. Get a Johnson CM30 Pump on E-bay. Installed $ 250.00.
This marine pump exceeds the benz pump flow and works great
Yup - Johnson CM30 pump and if you really wanna keep things cool - a Heat exchanger should do the trick - no more supercharger kill or power drop :)
The first thing to do is to have the engine management system scanned. There is probably a defective sensor that is confusing the computer so it is reducing the power. Any check engine lights? Does it feel like your exhaust is possibly plugged up from an over heated/defective catalytic converter?

Yes, in fact it is the computer that controls all the power, after it receives input from the driver, but if the input is skewed,( bad senors etc) then the computer will not control the engine properly, it is the old 'garbage in, garbage out' scenario. City driving alone would not hurt a Catalytic Converter. Do you have a Check Engine or Service Engine Soon light on? If so, the first thing to do is to get the codes scanned and addressed ASAP.
Can the computer vary the ammount of power ? or is there only all go or limp ? The exhaust was a sugestion that another person sugested, I suspect the car was just dribbled arround until I got my hands on driving stop start and short trips I suspect. There are no engine warning lights on and it logs no malfunctions on the dash screen.
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