3 bar fuel pressure regulator
11-10-2008, 09:35 PM
#21
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Dropped the fuel pressure to somewhere around 43-44 psi. The pitch of the pump increased quite a bit. My 96# injectors were rated 96 lb/hr at 3 bar, so I had them in the tune as about 110 lb/hr to match the 4 bar fuel pressure. I just turned the pressure down, changed the IFR table back to 96 lb/hr, and everything worked fine without having to tweak any of the airflow tables at all. Very simple 
At 5600 RPM and 10psi I'm still only seeing 51% IDC max, lol.
At 5600 RPM and 10psi I'm still only seeing 51% IDC max, lol.
11-10-2008, 09:40 PM
#22
At the identical boost level, RPM, and AFR my max before was 41%. Looks like it added about 10% to the duty cycle.
Question for those who have studied this....if I drop my fuel pressure by 25% but it only raises my IDC by 10%, does that mean I gained a significant amount of efficiency?
Question for those who have studied this....if I drop my fuel pressure by 25% but it only raises my IDC by 10%, does that mean I gained a significant amount of efficiency?
11-10-2008, 09:46 PM
#23
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I think that would depend on how much fuel the injector can deliver at each pressure. The fuel delivery curve of the injector might not be linear.
11-10-2008, 09:52 PM
#24
Then I'm likely in a more efficient part of the curve right? Or something like that?
If the curve is not linear, but my calculated IFR at 4 bar was linear, then this should also remove a lot of "noise" from my tuning. Sounds like it's a good deal all around.
If the curve is not linear, but my calculated IFR at 4 bar was linear, then this should also remove a lot of "noise" from my tuning. Sounds like it's a good deal all around.
11-11-2008, 12:26 PM
#29
I am quiet surprised thunder you hadn't locked onto this much earlier. I have always contemplated doing it just see if the moto 60's were any easier to idle tune.