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BIMMIN BIMMIN is offline
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Default 07-09-2019, 08:10 AM

How does that work with fuel bias. Not thread jacking, just asking for further information on the fuel bias and what it should be set at to fix the below 1k psi dips


2009 E92 335i AT
Engine
Rev9 Hybrid 16t twins, Injen cyborg intake, CP-e charge pipe with HKS SSqv BOV, RB external PCV catch can, BMS catch can, Cobb intercooler, HKS Legamax exhaust, RB inlets, VTT single barrel hpfp, fuel-it! stage 2 lpfp, MOTiV Flex fuel flash only w/ trans tune by Cedar Performance
558rwhp and 523rwtq on e60 110* ambient air
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Janforthewin Janforthewin is offline
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Default 07-09-2019, 10:04 AM

Hey dave, yeah LPFP seems maxed.. what do you recommend? Lower boost or lower E content?

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Hpfp is fine- no need to upgrade that- just need to bump up your fuel bias a bit towards redline...

Your LPFP looks maxed up top however..


2007 AT e92, VTT Stage 2+, Fuel it Port Injection kit, BMS PI Controller, Fuel it stg 2 LPFP, ER Charge Pipe w/ HKS BOV, Alpina Trans flash, VRSF **, MMP Relocated Inlets, RB PCV, n20 tmap, FMIC, BMW PE, MHD PI hybrid Backened flash
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(#28)
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Janforthewin Janforthewin is offline
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Default 07-09-2019, 10:05 AM

I'm not sure how it works for the single barrel but with port injection from my understand where your hpfp dips you adjust Fuel Bias by rpm to spray more fuel to help hpfp numbers.

Quote:
Originally Posted by BIMMIN
How does that work with fuel bias. Not thread jacking, just asking for further information on the fuel bias and what it should be set at to fix the below 1k psi dips


2007 AT e92, VTT Stage 2+, Fuel it Port Injection kit, BMS PI Controller, Fuel it stg 2 LPFP, ER Charge Pipe w/ HKS BOV, Alpina Trans flash, VRSF **, MMP Relocated Inlets, RB PCV, n20 tmap, FMIC, BMW PE, MHD PI hybrid Backened flash
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(#29)
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THE BEAST THE BEAST is offline
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Default 07-09-2019, 10:12 AM

Correct. Your LPFP has to be able to supply enough fuel for HPFP AND P.I.
Once you have the capability, you adjust your pi to spray an adequate amount of fuel where needed.
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THE BEAST THE BEAST is offline
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Default 07-09-2019, 10:13 AM

Quote:
Originally Posted by Janforthewin
I'm not sure how it works for the single barrel but with port injection from my understand where your hpfp dips you adjust Fuel Bias by rpm to spray more fuel to help hpfp numbers.
As I said, correct. Keep in mind trims also play a factor.
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(#31)
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BIMMIN BIMMIN is offline
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Default 07-09-2019, 10:17 AM

That makes sense now. Thank you!


2009 E92 335i AT
Engine
Rev9 Hybrid 16t twins, Injen cyborg intake, CP-e charge pipe with HKS SSqv BOV, RB external PCV catch can, BMS catch can, Cobb intercooler, HKS Legamax exhaust, RB inlets, VTT single barrel hpfp, fuel-it! stage 2 lpfp, MOTiV Flex fuel flash only w/ trans tune by Cedar Performance
558rwhp and 523rwtq on e60 110* ambient air
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(#32)
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Janforthewin Janforthewin is offline
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Default 07-09-2019, 10:31 AM

Thanks beast. So if my lpfp is maxed out no matter how much I adjust the FB my hpfp wont raise?

Quote:
Originally Posted by THE BEAST
As I said, correct. Keep in mind trims also play a factor.


2007 AT e92, VTT Stage 2+, Fuel it Port Injection kit, BMS PI Controller, Fuel it stg 2 LPFP, ER Charge Pipe w/ HKS BOV, Alpina Trans flash, VRSF **, MMP Relocated Inlets, RB PCV, n20 tmap, FMIC, BMW PE, MHD PI hybrid Backened flash
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THE BEAST THE BEAST is offline
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Default 07-09-2019, 08:34 PM

Quote:
Originally Posted by Janforthewin
Thanks beast. So if my lpfp is maxed out no matter how much I adjust the FB my hpfp wont raise?
Correct. If not enough fuel is supplied from tank to engine, it doesnt matter how its distributed. It still not enough fuel.
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Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Default 07-09-2019, 09:01 PM

Quote:
Originally Posted by Janforthewin
Hey dave, yeah LPFP seems maxed.. what do you recommend? Lower boost or lower E content?
Up to you...

Lower ethanol content is the quick fix for now.

But if you want to turn up a bit more / more ethanol- id upgrade your s2 to an s3



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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