James Wingfield Posted July 9, 2012 Report Share Posted July 9, 2012 How does the barometric correction get applied to a TPS based load axis? I'm thinking of reverting to a TPS based load axis but I would like to understand how this standard correction is applied before I make the change. I was planning to introduce a MAP based correction by means of a MGP based 4D map, but I don't want to inadvertantly add in the same correction twice if its already in there. Does the Baro correction apply a 1% change to the value in the base fuel map for each kPa above/below standard atmospheric condition?  On a similar note, is it possible to obtain an electronic model that shows how the ECU works and calculates all of its parameters?  Thanks,  James Quote Link to comment Share on other sites More sharing options...
Scott Posted July 10, 2012 Report Share Posted July 10, 2012 Hi James, Have a read of this PCLink Help > G4 ECU Tuning Functions > Fuel > Fuel Setup > Â Fuel Equation It explains which setup options use barometric compensation and which do not. I think you would be best to have your Fuel Equation set to Load = BAP, set the load axis of your main fuel table to TPS and then set your 4D load axis to MAP. We do not have an electronic model of the ECU. Cheers, Scott. Quote Link to comment Share on other sites More sharing options...
James Wingfield Posted July 10, 2012 Author Report Share Posted July 10, 2012 Thanks Scott,  I've had a look at that but it would appear to be based on the G4 ECU and I don't think the G3 is the same. Is that correct? The way I read it, the G3 options for a TPS-based Y-axis are equivalent to Load = MAP or Load = BAP/MAP/X-over in G4 terminology. If I set my G3 to "Throttle position - BAP correction" and then tune the car, will I get a map that is correct for ambient pressure but not referenced to manifold pressure at any point? If so then it seems OK and I can add my manifold pressure adjustment via a 4D table. That adjustment will then be from 0-3 bar Absolute. I'm still slightly concerned however that the values I tune into my fuel table will already allow for changing manifold pressures. Can you confirm if that is the case?  James  Quote Link to comment Share on other sites More sharing options...
Scott Posted July 11, 2012 Report Share Posted July 11, 2012 Hi again James, Apologies, I missed that it was a G3 ECU you have. I have loaded up the PCLink 3.4 and looked at the options and help, and also spoken to the engineer who did some work on that version. The consensus is that you would want to set your load axis to Throttle Position - BAP Correction and your 4D table to MAP. This should give you your barometric compensation only once. Regards, Scott Quote Link to comment Share on other sites More sharing options...
James Wingfield Posted July 18, 2012 Author Report Share Posted July 18, 2012 OK thanks, I'll give it a go.  James Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.