Ti Automotive (Walbro) 274 vs 285 vs 295

[martymil]

I tested the bucketless setup and works fine at 630rwhp but it flows around 20 to 25 % more than a bucket system.

 

[KAIZZER]

Mine has already come in the mail along with the filter. I trying to find the corrugated hose now.

 

[NoGuru]

I tested the bucketless setup and works fine at 630rwhp but it flows around 20 to 25 % more than a bucket system.

Tested what, the 535?
So I could probably drop the port injection and second pump and still run full E85? That's if the HPFP can handle it but if I drop the other stuff I can get a Helix or Double barrel.

 

[martymil]

I run a double barrel and a bucketless 535 with no issues or fuel pressure drops

 

[fmorelli]

I'm working on a few of these setups right now for Z4s and 335i, along with active cooling. I believe this chart is correct. The overlays help I believe. @martymil are you running a 25A fuse for spike headroom on the pump amperage? Most datazap logs I've examine show values inside of this graph, but a request spike can be there. I also noted that a number of logs I examined had bizarre fuel pressure zig-zap spiking.

Filippo

 

[martymil]

Stock fuse dude, but i have no spikes and very steady fuel pressure

 

[curtisgjr]

I have been running ek3 stock fuse and 535 after martymill chimed in... might not need it but i figured if it gets hot and running hard cant hurt for 20.00 and little time.. I finally tapped into exhaust flapper valve red white wire + 12v when on after shut off stays on 15 seconds than shuts off..ran over to a startech copper heatsink with fan .took some ek thermal paste between zip tied tight. for bracket just bent piece of aluminum drilled a hole put 1 bolt to hold firm .. I also soldered a couple single pins to make easier to hook up incase need replace fan some point going to add a 3a inline fuse tommorow

 

[KAIZZER]

Managed to get my 535 pump installed recently, and thus far its been functioning flawlessly. Thanks again guys! @martymil

 

[NoGuru]

I should report that mine is working great, (535) after only a few weeks.

 

[martymil]

Best bang for buck fuel pump on our platform, 450's are just a waste of time and money.

 

[Neophyte]

Managed to get my 535 pump installed recently, and thus far its been functioning flawlessly. Thanks again guys! @martymil

I should report that mine is working great, (535) after only a few weeks.

Did you guys end up going bucketless?

Not sure if keeping the bucket with the 535 pump would be worthwhile? I'd still like to keep bucket though.

 

[KAIZZER]

I retained the factory setup. Used a new fuel filter, etc and added the 535 pump. Just keep it simple.

 

[NoGuru]

I am buckless, have been for a few years.

 

[fmorelli]

In a world of Alice in Wonderland, someone would figure out how to run @martymil's setup in a Z4 configuration. One can dream ...

Filippo

 

[doublespaces]

Put a few different fuel pumps on a flow bench. The shots are angled upward and the glass gives a parallax effect so the numbers are actually higher. Also the mineral spirits fluid has a different viscosity than fuel so you can only compare between them. The control was the walbro 450(274) it was brand new so flows less than broken in. ~73 psi @ 13.5v

 

[martymil]

would love to see a 295 in there for comparison.

 

[martymil]

Also this is testing the fuel pump itself which is not bad but this greatly changes in a bucket system, the only way you might see those flow rates is
in a bucket less setup.

 

[doublespaces]

Here is the 295, the picture is taken at the same poor angle just so it's comparable.

 

[martymil]

On e50 and around 680hp I started to see the 295 pump starting to waiver and dropping to around 68psi.

Not bad for a single bucket less setup.

 

[Chill]

On e50 and around 680hp I started to see the 295 pump starting to waiver and dropping to around 68psi.

Not bad for a single bucket less setup.

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I am buckless, have been for a few years.

any trackdays so far?