| Re: tuning and MAP questions |
Subject: Re: tuning and MAP questions by tjpreul on 2012/7/11 4:18:53 I bought the Procharger and unit off of ebay, it had the piggyback and software with it. This was a never installed unit that had been purchased in '06. However the Split Second p/n is FTC1-075. Which I don't think is available anymore due to the lack of sales. It is a fuel and spark management system. It has a vacuum hose that runs to the box, then sends the voltage to the factory ECU for the MAP reading. You set the output voltage by changing the value in the table to match the factory MAP at atmospheric pressure. By doing this it will compensate for having a forced induction engine. After that you have a table that you adjust the fuel levels with. According to them it is to trick the factory ECU to thinking it is at a different part of the set table. Then you are to readjust the fuel at that certain MAP point to even it out. Here is a link. http://www.splitsec.com/technotes/Fue ... sing_2-bar_Map_Sensor.pdf It is to add or remove fuel when and where it is needed. Then this table is an "overlay" of the factory table. My confusion is when I called Split Second they say to tune without the O2's. When I first start my car the AFR is reading high 13's to 14's. Then it drops to 10, which I think is when it goes to closed loop. Yes, the signal wire from the MAP sensor is cut. The new signal is sent to the factory ECU from the piggyback. At 0 psi, I have them matched at 4.7v. When at idle (although not connected) the factory MAP has an output of 1.9v, and the piggyback has a 1.2v. This makes the factory ECU think it is running at a lower rpm, so then you can use the fuel table to adjust to the correct level. |
