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long response, what are you modifying?
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Posted by Dean (more from Dean) on Thu, 17 Oct 2002 11:00:28 Share Post by Email
In Reply to: adding a resistor to Pressure transducer?, Andrew [Profile/Gallery] , Wed, 16 Oct 2002 23:43:10
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You have not posted what you are driving?

With the T5, the internal resistance to ground measured at 960 ohms, perhaps it is nominally 1K.

With the T5, the resistor goes in in the gray wire, not anywhere else. So the 50 ohms will be added to the variable resistance of the map sensor. So the voltage drop across the 50 ohms will reduce the voltage drop across the internal 1K in the ECU.

It was posted in responses to my orignal thread that 80 ohms will shift the pressure map by about 5 PSI, and it was stated that fuel mods were required for that.

What paralleled resistor are you talking about?

I went back to 50 ohmns on my 95SET. That works much better than 100 ohms. I have not modified my fuel pressure and do not intend to. My boost is under MBC control. I seek to increase the fuel cut with the resistor map mod, not my boost pressure. This AM, 40F, damp weather, I got 17 PSI of boost with no fuel cut. That seems decent. I have not had a chance to do some runs and dial in my boost to a bit lower than that.

I tried 100 ohms, that was strong for the first drive, but did not perform well after adaption the next day. Higher values of resistance do require modification of the fuel system pressure. That is entering dangerous territory.

My objectives are to shift up the fuel cut to provide headroom for MBC pressure overshoots, to allow the MBC to be pressurised for the TB. The desired end result is an inexpensive MBC config, without fuel cuts in cold weather and without the boost taper that basic MBC installation suffer. My target boost pressures are around 15-16 PSI.

My T5 work is experimental. Follow at you own peril. In time it may prove to be decent minor control system hack. (I don't consider a MBC alone to be a control system hack, as the ECU and its sensors are stock, and the ECU is working within the limits of its factory fuel mapping.)

Are you confusing C900 APC electical mods with T5 MAP sensor hacks?

posted by 208.24.179...
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