how do u calculate fuel rate for injectors on hp tumer. lx9 swap [Archive] - GrandAmGT.com Forum

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gsanche7
07-16-2012, 12:35 PM
So i have a 2001 pontiac grand am i did the lx9 3.5l swap . Am using the stock 3.4l injectors
The specific table i am looking at in hp tuners is (injecor fuel rate vs kpa) this table reads 21.31 in the stock tune . My question is what would be th?e best fuel rate for the 3.5l?

AleroB888
07-16-2012, 12:52 PM
So i have a 2001 pontiac grand am i did the lx9 3.5l swap . Am using the stock 3.4l injectors
The specific table i am looking at in hp tuners is (injecor fuel rate vs kpa) this table reads 21.31 in the stock tune . My question is what would be th?e best fuel rate for the 3.5l?

If your fuel pressure is the same as before, then don't change the IFR. You can change the IFR value slightly to adjust average fuel trims, but generally not recommended.

gsanche7
07-16-2012, 02:20 PM
Okay . Thanks are u running an Lx9?

AleroB888
07-16-2012, 02:54 PM
Okay . Thanks are u running an Lx9?

No, but if you are using a PCM that has 3400 V6 tuning and 3400 V6 injectors, that much is the same. There are other things that may need to change in the PCM, and the IFR may need to change slightly, too, but I would not start there.

gsanche7
07-16-2012, 03:15 PM
i downloaded a stock tune from hp tuners for a 3.5l lx9 and i did notice that timing on that one was silghtly higher i modified my tune to equal the same as the lx9 . So now am working on the correcting IFR but i couldnt find IFR on the LX9 tune thats why am asking what would be the proper IFR

AleroB888
07-16-2012, 03:36 PM
i downloaded a stock tune from hp tuners for a 3.5l lx9 and i did notice that timing on that one was silghtly higher i modified my tune to equal the same as the lx9 . So now am working on the correcting IFR but i couldnt find IFR on the LX9 tune thats why am asking what would be the proper IFR

It may be configured differently on the 3.5 LX9 program, on a different type table with other units of measurement. In that case, yes, you would have to find that table and convert the units. However, I don't expect there to be a big difference once that is done. IFR relates mostly to injector size and fuel pressure.

There may also be some fuel-related 3.5 tables that don't transfer directly to the 3400 PCM.