Fuel Type

[psycho]

In promgrammer there are several tables and constants referring to Fuel Type and premium fuel settings. Are these valid settings that do anything? I couldn't find hardly anything about them in the P4 Doc. Any help would be appreciated.

 

[leroy]

The ecm can advance the timing until knock is detected to determine fuel type. If premium fuel is detected, additional timing can be added. However, the stock chip isn't set up to add any more timing. There are some additional parameters that can be adjusted for the fuel type test. At least that's my primitive concept of how it works.

Jim

 

[psycho]

Has it been determined that the ECM will actually run the fuel type check or are all the Tables and Constants for Fuel Type Determination just there for nothing like the Injector Flow Rate? I didn't see anything about the Fuel Type stuff in the P4 doc. I was thinking about implementing it into my next chip if it works as I sometimes mix different fuels and would like it to compensate when I am running "good" gas.

 

[leroy]

I assume it will work, but haven't tried it. I've thought about trying to use it also, but there's not much resolution for the premium fuel advance table, so decided to just use different chips for different fuels.

I believe the injector flow rate could be used for mpg calculations, even though it doesn't impact pulsewidth.

Jim

 

[psycho]

Well, I might do some playing with it and see if I can verify anything. Does anyone have a test bench they could try it on?