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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > B58 Log Review Thread
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      Today, 09:25 AM   #947
Colauk
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Quote:
Originally Posted by IMS-340MP View Post
Guys I don't get this, why is the fuel rail pressure of the upgraded higher pressure HPFP still the same as the original HPFP at around 2900 psi ?

Isn't that the reason people upgrade the HPFP to get higher fuel flow and be able to increase boost ?
2900psi is what the dme will be requesting, the problem with the stock hpfp is that at higher loads it wont be able to flow enough to hit the target pressure.

its not about the maximum volume the pump can flow but more its ability to maintain target pressure.
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      Today, 10:03 AM   #948
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So this means an M340i or a Supra will also have 2900 psi rail pressure in their logs ?

Anybody have access to an M340i log ? would really like to compare it our cars.

Quote:
Originally Posted by Colauk View Post
2900psi is what the dme will be requesting, the problem with the stock hpfp is that at higher loads it wont be able to flow enough to hit the target pressure.

its not about the maximum volume the pump can flow but more its ability to maintain target pressure.
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      Today, 10:08 AM   #949
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Going from E85 to E50 is like lowering the octane so it's normal to get some timing corrections.
Quote:
Originally Posted by SÁpreme View Post
We walked our ethanol % back to E50 because gas mileage on E85 was killing me, but I'm seeing timing corrections on some of the new logs.

Pure 800 E50 rev 1.0
https://datazap.me/u/tnilson/second-...og=0&data=4-24

Pure800 E50 rev 1.1
https://datazap.me/u/tnilson/e50-pur...og=0&data=4-24

Plugs are NGK 94201 gapped to 0.022", less than 5K miles on them.

Thoughts?
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