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mikeyoooooo mikeyoooooo is offline
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Default Port Injection or HPFP Overdrive - 09-04-2021, 04:13 PM

My turbos are starting to go and was looking to upgrade to RB Two Plus turbos and would like to run full e85. Which is the better method nowadays for full e85? PI or HPFP overdrive?
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Payam @ BMS Payam @ BMS is offline
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Default 09-04-2021, 10:56 PM

Port injection 100%. You don't want to put all that stress on the DI system when it was not designed to handle those kind of pressures.

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Default 09-05-2021, 12:24 AM

Port Injection

Do anything you can to get away from direct injection only.

Its easy and works.
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zach1328 zach1328 is offline
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Default 09-05-2021, 05:05 AM

I personally really like DI only apart from the carbon build-up issues. Regardless, I went with PI partly because I don't trust the HPFP overdrives but mostly because PI is proven. Port injection isn't only proven on the N54 platform but also many many other platforms with high HP builds.

IMO it will always remain the ultimate fueling solution. You also get the benefit of minimal carbon build-up on valves assuming you're getting into power/boost often enough for PI to kick in.

That said, if there were a highly proven aftermarket HPFP upgrade to support ~600whp on 100% E85 then I would have done it. I just don't love the idea of an OEM HPFP with overdrive. I'd want to see an actual upgraded pump with years and years and years of highly proven results on multiple platforms (as is the case with port injection).

2007 335i - JB4 + MHD BEF, RB Twos Plus, PI + Stage 3 LPFP, 100% E85, BMS DCI, VRSF **, VRSF 7.5" FMIC, VRSF CP w/ TiAL BOV, MMP inlets, VRSF aluminum outlets, XHP Stage 3, TC Kline SA, M3 F/R control arms
2008 535i

Last edited by zach1328; 09-05-2021 at 05:14 AM..
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mikeyoooooo mikeyoooooo is offline
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Default 09-05-2021, 09:38 AM

Looks like port injection it is! Thank you for the replies
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