E89 Z4 dual lpfp in-tank?

[fmorelli]

Ok ... the E89 Z4 has a hanging LPFP in-tank, unlike every other BMW on the planet. This is yet another one of the BMW intern wonders of the Z4.

Anyone know of someone that has figured out how to actually run two LPFP's IN THE TANK (not an external second pump)?

@NoQuarter @BQTuning @Eracer76 @Tuningservice.no @InnovativeAuto @Crazy8 @jts1981 @Twisted Tuning @Keko

This is in context to supporting 600whp DI or possibly PI with E-mix.

For those curious... Z4 LPFP not same as every other BMW on planet. Hanger mounted from inside.

Filippo

 

[martymil]

could you fit a 535 lph pump in there as that can easily support 600+ using a single pump of the stock ekp3

 

[fmorelli]

could you fit a 535 lph pump in there as that can easily support 600+ using a single pump of the stock ekp3

I have seen that mentioned, @martymil , and @Crazy8 talked about it on another thread. I've not seen anyone do it. This is the pump with no check valve, I believe, and lower amperage draw. Know anyone running that setup (any N54) at those power levels?

Filippo

 

[martymil]

Yes me , pump is physically the same size as a 450

I'm running just over 600

 

[martymil]

I've been running it for a few months now

 

[fmorelli]

Well ... that makes life easy! Thanks!

Filippo

 

[martymil]

you don't really need to run a valve but its easy to make it work, just put one anywhere between the fuel pump and lpfp sensor

 

[fmorelli]

@martymil I've seen a few comments from you in threads. Write anything up anywhere by chance? 535lph Walbro and an inline check valve at external point (e.g. I have an external filter under the car). Z4 has no LPFP sensor. It runs on EPK but runs wide open.

Filippo

(@Seb335i)

 

[martymil]

If you have no sensor then you won't need a check valve, but if you do just piggy back it of the filter

 

[martymil]

I didn't do a write up but did talk about it and the hydra mat bucketless setup in the fuel pump thread

 

[Seb335i]

could you fit a 535 lph pump in there as that can easily support 600+ using a single pump of the stock ekp3

With what kind of fuel ? Can I consider running 100% e85 with one 535 pump ?

 

[martymil]

I'm running e20

 

[KAIZZER]

So in theory, it should be 100% plug and play then...

Walbro F90000295 535 LPH DCSS Twin Turbine Fuel Pump (E85 Compatible / No Check Valve)

Fuel: GAS & E85Horsepower: 900+ at 60PSI, naturally aspirated applicationsOver All Pump Length: 131mmMain Housing Diameter: 39mmLower Housing Diameter: 50mmFuel Inlet Diameter: 11mm ODFuel Outlet Diameter: 11mm ODFlow Rate: 535LPH at 40psiTest Voltage: 13.5 VoltsNote: Pump does NOT have a check...

www.lethalperformance.com

 

[fmorelli]

So in theory, it should be 100% plug and play then...

Well accepted a lot of people are running much more e-mix so that remains a significant question in my mind.

Filippo

 

[KAIZZER]

Point taken. Sub'd for more conclusive info.

I do recall @Crazy8 making mention of other Z's utilizing this setup. Hoping he could help by shedding some more light on the topic.

-Reef

 

[fmorelli]

We need @martymil to have a customer that wants a complete Oz z4 build

Filippo

 

[fmorelli]

Adding to this - Z4 LPFP as I understand too small to fit two pumps in the bucket.

Filippo

 

[martymil]

If the demon can do 900hp on e85 using the 525 it shouldn't be a problem to run the 535 at 600hp

I know it doesn't quite work like that but the pump is cheap and it's a matter of just swapping it out.

The 535 is basically plug and play and its the best pump for our cars in my books

 

[KAIZZER]

Factory HPFP and all? My reason for asking is because I'm upgrading my snails and I am a bit 50/50 about the factory pump. I'm down to try it and see what the conclusive results are.

 

[martymil]

VTT gc 2.0 running 26psi

Single 535 pump with inline flapper, flex sensor, external fuel reg with return line.

Car runs around 620 to 630 rwhp when converted from dyno dynamics to dyno jet.

Car runs back to back 128mph down the 1/4 mile.

Cant offer anything else as proof, but I am running only a max of e20