Ti Automotive (Walbro) 274 vs 285 vs 295

NoGuru

Captain
Jan 9, 2018
1,204
589
0
Just North of Detroit
Ride
BMW 335is
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.
 

fmorelli

Lieutenant General
Staff member
Aug 11, 2017
3,748
3,592
0
57
Virginia
Ride
E89 Z4 35i, F10 535d
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

Walbro 535.png
 
Last edited:

curtisgjr

Lurker
Mar 27, 2020
18
-2
0
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
 

Attachments

  • thumbnail3.jpg
    thumbnail3.jpg
    55.4 KB · Views: 157
  • thumbnail4.jpg
    thumbnail4.jpg
    110 KB · Views: 148
  • thumbnail5.jpg
    thumbnail5.jpg
    130.3 KB · Views: 136
  • thumbnail1.jpg
    thumbnail1.jpg
    77.8 KB · Views: 153
  • Like
Reactions: martymil and NoGuru

TiAgAu

Corporal
Nov 18, 2018
139
56
0
Australia
Ride
08 335i
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.
 
  • Like
Reactions: martymil

fmorelli

Lieutenant General
Staff member
Aug 11, 2017
3,748
3,592
0
57
Virginia
Ride
E89 Z4 35i, F10 535d
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

Administrator
Oct 18, 2016
9,303
4,331
0
AZ
Ride
2009 E93 335i
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
 

Attachments

  • IMG_20200807_190107.png
    IMG_20200807_190107.png
    2 MB · Views: 114
  • IMG_20200807_185409.png
    IMG_20200807_185409.png
    2.1 MB · Views: 113
  • IMG_20200807_184136.png
    IMG_20200807_184136.png
    2.1 MB · Views: 109
  • IMG_20200807_184129.png
    IMG_20200807_184129.png
    2 MB · Views: 105
  • IMG_20200807_184119.png
    IMG_20200807_184119.png
    1.5 MB · Views: 123

martymil

Major General
Sep 6, 2017
3,331
1,906
0
Down Under
Ride
S65 1m
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.