john samsung Posted March 30, 2013 Report Share Posted March 30, 2013 Hi guys Quick question, when mapping RB25 DET with Link G4, What input would you base the fuel table on, MGP, MAP,TP etc etc ? Reason i ask i had the car tuned and pulled the pcl file off to have a look myself to try play with the PC link software a little on the laptop, and notice the fuel table is based on throttle position yet i see a lot of threads on here talking about mgp, the ignition table is mapped by mgp Quote Link to comment Share on other sites More sharing options...
john samsung Posted March 30, 2013 Author Report Share Posted March 30, 2013 ignition is not mgo, map i meant, ignition is mapped by MAP kPa. Fuel is on TP (main)% Quote Link to comment Share on other sites More sharing options...
john samsung Posted March 30, 2013 Author Report Share Posted March 30, 2013 how do you edit posts on this forum, Quote Link to comment Share on other sites More sharing options...
Scott Posted April 2, 2013 Report Share Posted April 2, 2013 Hi John, Here is some general fuel table load axis setup advice depending on engine setup: Naturally aspirated engines with stable intake manifold pressures. Fuel Equation - Load = MAP Fuel table load axis - MGP Naturally aspirated engine with unstable intake manifold pressures. Fuel Equation - Load = BAP Fuel table load axis - TP(Main) Turbo/super charged engines with stable intake manifold pressures. Fuel Equation - Load = MAP Fuel table load axis - MGP Turbo/super charged engine with unstable intake manifold pressures below atmospheric pressure. Fuel Equation - Load = BAP/MAP Xover Fuel table 1 load axis - TP(Main) 4D fuel table load axis - MGP The RB engines with individual throttle bodies often have trouble maintaining a stable intake pressure, which is why they often have the main fuel table on TP(Main). Scott Quote Link to comment Share on other sites More sharing options...
Scott Posted May 26, 2013 Report Share Posted May 26, 2013 Hi John, Yes, for an RB25DET I would agree that MGP is the best choice. Ideally MGP would be used for the fuel table axis on all setups, however the problem is that some engines have very unstable manifold vacuum. Quite often this occurs on vehicles where each cylinder has an individual throttle body (like the RB26DETT). For these engines they are better off using TPS as the system is then more stable. Once the engine comes up on boost the manifold pressure is more stable, and therefore we recommend using MGP on a 4D table above atmospheric pressure. Cheers, Scott Quote Link to comment Share on other sites More sharing options...
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