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About healthy Lambda probes actual value
- Thread starter kakluote
- Start date
Diggs24
Autocross Champion
- Location
- de plains! de plains!
- Car(s)
- 2015 GTI
If lambda is drifting from setpoint it means too much air and not enough fuel. Turn down boost or get better pumps or mpi for more fuel.
i am trying to set to 0.83, hpfp to 230bars
Diggs24
Autocross Champion
- Location
- de plains! de plains!
- Car(s)
- 2015 GTI
Is it hitting 230? HPFP is hard to control. MPI is a better choice.
let me log
Hoon
Autocross Champion
- Location
- Rhode Island
I'm not sure what tuning solution you're using, but increasing rail pressure is not a viable means of controlling lambda on these ECUs.
Hoon
Autocross Champion
- Location
- Rhode Island
okay, I was unclear by your post if you were trying to hit .83 lamda by increasing the HPFP to 230 bar
WHY?
Can you tell me why you want 230bar?
I think you need to understand what affect fuel pressure has on performance and timing.
rich target lambda to 0.83 and more faster fuel trim so we increase to 230 bar max high fuel pressure
right ?
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Hoon
Autocross Champion
- Location
- Rhode Island
Dan,
Quite common to run 220-230 bar on Cobb tuned cars with aftermarket HPFPs in the US.
AFR, pressure and injector MS all go hand in hand on these ecus
You can set AFR ie 0.83 in the maps, you can set the fuel pressure in the setpoint point maps and what you end up is with an injector MS which gives you the AFR and the fuel pressure you requested.
Issue is that the injector MS is as important if not more important than the pressure you run them at.
So why people set fuel pressure to a certain pressure is not the way to do it. you need to set the fuel pressure to give you the optimal MS for DI injectors. too low and the injectors don't spray properly and atomise , too high and you over heat the fuel and again doesn't atomise properly.
Setting the fuel pressure to the optimum is just as important as the AFR you set. It might be 207bar or 229bar but you need to find the good point where injector MS is correct
You can set AFR ie 0.83 in the maps, you can set the fuel pressure in the setpoint point maps and what you end up is with an injector MS which gives you the AFR and the fuel pressure you requested.
Issue is that the injector MS is as important if not more important than the pressure you run them at.
So why people set fuel pressure to a certain pressure is not the way to do it. you need to set the fuel pressure to give you the optimal MS for DI injectors. too low and the injectors don't spray properly and atomise , too high and you over heat the fuel and again doesn't atomise properly.
Setting the fuel pressure to the optimum is just as important as the AFR you set. It might be 207bar or 229bar but you need to find the good point where injector MS is correct
it is hard for them to find optimal pressure ,so tuners just simple increase it to 229 or 230 ,just my guess
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