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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Dorch Stage 3 HPFP Kit
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      06-02-2021, 04:25 PM   #1
-Eidos
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For those that have seen my progress towards building a direct-injected only N55 car capable of 600+whp SAE on full E85 (Ethanol sensor reading at least 85% E) here: https://f87.bimmerpost.com/forums/sh...4&postcount=25

I just got the okay from Dorch to let everyone know that they will be starting production on the Stage 3 HPFP kit soon!

Some additional information from Chris at Dorch:

"As for the production kit, the final flow percentage gain number still may change, so that’s the only thing not set in stone. That call will be made in the next month here as we finalize more testing before ramping up production (finally!). The kit will come with a new flange and it will work with existing S1 and S2 kits, but depending on when the original HPFP kit was purchased, their pump may need to be sent in for an update service. This will most likely be free of charge with the purchase of the lift kit."
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      06-03-2021, 08:30 PM   #2
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Definitely interested and will be contacting them for more info.
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      06-03-2021, 09:01 PM   #3
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Quote:
Originally Posted by 5w20 View Post
Definitely interested and will be contacting them for more info.
you planning on running twin lpfp?
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      06-04-2021, 01:07 AM   #4
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Quote:
Originally Posted by Phantom10R View Post
you planning on running twin lpfp?
A single 525/hellcat pump should support 600+ whp.
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      06-04-2021, 01:12 AM   #5
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Originally Posted by Phantom10R View Post
you planning on running twin lpfp?
Iím not opposed to it. Iím looking into options I have for ~600whp. I would just prefer to run full E85 but would still consider a E85/meth mix.
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      06-04-2021, 12:00 PM   #6
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Quote:
Originally Posted by 5w20 View Post
I’m not opposed to it. I’m looking into options I have for ~600whp. I would just prefer to run full E85 but would still consider a E85/meth mix.
A single Walbro 525 should be sufficient for low 600's. However, it flows a lot and you run the risk of blowing a line in the LPFP assembly. I had to upgrade mine to a sturdier line. You will also need to run the EOS BPM4 EKP to support the single pump.
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      06-10-2021, 10:01 PM   #7
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this pump will outflow the fx180 correct? I'm looking for 600 on e85 with a flex fuel analyzer for simple fill and kill on one tune. MHD is coming out with all necessary components very soon as bm3 has is my understanding.
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      06-10-2021, 11:33 PM   #8
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Quote:
Originally Posted by 52172 View Post
this pump will outflow the fx180 correct? I'm looking for 600 on e85 with a flex fuel analyzer for simple fill and kill on one tune. MHD is coming out with all necessary components very soon as bm3 has is my understanding.
For sure lol.

None of the current pumps on the market come close to the stage 3. Should be between 115% to 125% increased flow over stock. We'll find out the specifics once Dorch finalizes their testing.
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      11-24-2021, 11:17 AM   #9
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Here is the official product page for the N55 lift kit that pairs with Dorch Stage 1 and 2 pumps that is coming soon with some more information:

https://dorchengineering.com/product...-hpfp-upgrade/

It will add an additional 49% flow on top of either the stage 1 hpfp or stage 2 hpfp.

The stage "2.5" setup (Stage 1 + Lift Kit) will yield 117% flow over stock.

The stage "3" setup (Stage 2 + Lift Kit) will yield 160% flow over stock. This is the setup that I'm currently testing for Dorch on my DI-only build.
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      11-24-2021, 01:09 PM   #10
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Thanks for the update, Eidos.
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      11-28-2021, 10:15 PM   #11
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It's unfortunate this isnt compatible with OEM HPFP, still waiting for a HPFP solution that does not require a tune.
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      11-28-2021, 11:41 PM   #12
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Quote:
Originally Posted by -Eidos View Post
Here is the official product page for the N55 lift kit that pairs with Dorch Stage 1 and 2 pumps that is coming soon with some more information:

https://dorchengineering.com/product...-hpfp-upgrade/

It will add an additional 49% flow on top of either the stage 1 hpfp or stage 2 hpfp.

The stage "2.5" setup (Stage 1 + Lift Kit) will yield 117% flow over stock.

The stage "3" setup (Stage 2 + Lift Kit) will yield 160% flow over stock. This is the setup that I'm currently testing for Dorch on my DI-only build.
Okay so based on the revised numbers on the Dorch website, the Lift Kit will essentially create these HPFP options from Dorch:

HPFP cc/rev %> List$

Stock 0.837 ——— ——-

Dorch1 1.221 +46% $1,100

Dorch2 1.465 +75% $1,600

D1+Lkit 1.818 +117% $1,900

D2+Lkit 2.181 +161% $2,400
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      11-29-2021, 02:42 AM   #13
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Quote:
Originally Posted by thejeremyman9 View Post
It's unfortunate this isnt compatible with OEM HPFP, still waiting for a HPFP solution that does not require a tune.
One can dream! Cali life

I'm assuming it's because you want to be able to smog on the stock tune while keeping the hardware the same (Or only having to swap out the downpipe)?
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      11-29-2021, 10:39 AM   #14
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      11-29-2021, 01:53 PM   #15
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Quote:
Originally Posted by -Eidos View Post
One can dream! Cali life

I'm assuming it's because you want to be able to smog on the stock tune while keeping the hardware the same (Or only having to swap out the downpipe)?
Correct, i want to be able to completely uninstall tune/software from DME to be able to smog and retain HPFP. I am on fabspeed DP and i am not worried about any of my other hardware for smog check. So as of right now i can still (in theory) pass smog just fine because everything i have installed is compatible with stock tune, and i don't expect them to notice or care about anything they might see like MST inlet or a CP.

There's no way i will be swapping a HPFP every 2 years to smog, so HPFP upgrade is basically a no go unless/until there is another option.
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      11-29-2021, 04:02 PM   #16
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Quote:
Originally Posted by thejeremyman9 View Post
Quote:
Originally Posted by -Eidos View Post
One can dream! Cali life

I'm assuming it's because you want to be able to smog on the stock tune while keeping the hardware the same (Or only having to swap out the downpipe)?
Correct, i want to be able to completely uninstall tune/software from DME to be able to smog and retain HPFP. I am on fabspeed DP and i am not worried about any of my other hardware for smog check. So as of right now i can still (in theory) pass smog just fine because everything i have installed is compatible with stock tune, and i don't expect them to notice or care about anything they might see like MST inlet or a CP.

There's no way i will be swapping a HPFP every 2 years to smog, so HPFP upgrade is basically a no go unless/until there is another option.
Yeah, the B58TU HPFP runs off the stock tune DME but then there's potential engine risk to take on with hardware incompatibility.
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      11-29-2021, 05:24 PM   #17
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Quote:
Originally Posted by thejeremyman9 View Post
Correct, i want to be able to completely uninstall tune/software from DME to be able to smog and retain HPFP. I am on fabspeed DP and i am not worried about any of my other hardware for smog check. So as of right now i can still (in theory) pass smog just fine because everything i have installed is compatible with stock tune, and i don't expect them to notice or care about anything they might see like MST inlet or a CP.

There's no way i will be swapping a HPFP every 2 years to smog, so HPFP upgrade is basically a no go unless/until there is another option.
WMI a no go?
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      11-29-2021, 06:04 PM   #18
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Quote:
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WMI a no go?
Its an option as you can install it stealthily enough to be undetected and just disable on stock tune but not something i personally want to do as i would rather keep everything DME controlled.
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