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      08-01-2017, 07:50 PM   #1
dre99gsx
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Z4 3.0si/Z4M Fuel pump specification

Just replaced my Z4 fuel pump with a new OEM unit. While I was at it, did some snooping. Turns out the Z4 fuel pumps are made by TI Automotive. Same company used by Walbro. Peeked my interested since I bought a Walbro 450lph pump to replace my current pump (having fuel issues at full boost), and had to do a double take when I noticed the OEM pump looked just like a Walbro unit!

I was surprised when this pump was able to supply enough fuel for my 2JZ swap, around 500whp with 45% Duty cycle at 7krpm (72psi fuel pressure). That's actually quiet impressive for an OEM fuel pump, but it shows these vehicles have enough fuel delivery for forced induction.

The casing is almost identical to the Walbro 450lph F90000267 pump in diameter and length, albeit slightly shorter. The 450lph is an E85 compatible high flow high power usage pump, but also high current draw.

Part #s on the pump: BMW 1614 7165175 , DE 7 50049 01, 061520187 120

It seems like the WALBRO TI AUTOMOTIVE TIA400-2 F90000262 FUEL PUMP 400LPH HIGH PRESSURE (UNIVERSAL) is an exact match in dimensions. Pump is rated at 500hp+. Has same electrical connector as well.
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Last edited by dre99gsx; 08-01-2017 at 07:58 PM.
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      08-01-2017, 08:12 PM   #2
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The only thing that doesnt make them very suitable for boost applications is that they have an internal fuel pressure regulator (with internal I mean that it sits in the white assembly, not in the pump casing), and that fuel pressure regulator is not vacuum (or boost) regulated but a set value.
For the 3.0si/z4m thats maybe less of an issue as they run on a fairly high pressure (I estimate 5 bar or so) but the 3.0i pump is regulated at 3,5bar (as far as capacity goes its the same internal pump I believe), so if you have 0,5 bar boost, that leaves 3.0 bar fuelpressure to get proper atomazation in/from your injectors.
With boost and thus the large pressure difference between vacuum and full boost I think boost/vacuum dependant regulated pressure would be better with the proper tuning (different fuel pressure automatically means new tuning of course).

This is btw the fuelpump on the m54 (pre-fl) versions:

Can length is 82mm, overall lenght (without the barbs/connector) is 97mm.
Can thickness is 39/46mm
No fancy qr code yet on this version, too old (these are the only markings)

I'm not sure if its equivalent to the walbro 400 or 450. The 450 is e85 compatible and the 400 is the pump gas version of basically the same pump. I have no idea if a stock z4 is e85 compatible (we dont get that here afaik).
These bmw pumps are probably specifically made for bmw with non generic/bmw only electric connectors molded into the housing.
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Last edited by GuidoK; 08-01-2017 at 08:37 PM.
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      08-01-2017, 08:55 PM   #3
dre99gsx
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Quote:
Originally Posted by GuidoK View Post
The only thing that doesnt make them very suitable for boost applications is that they have an internal fuel pressure regulator (with internal I mean that it sits in the white assembly, not in the pump casing), and that fuel pressure regulator is not vacuum (or boost) regulated but a set value.
I don't agree 100%! I'm running the OEM setup just fine. The trick is to run a solid state fuel pump controller. I am running 25psi at idle, ramping up to 72psi at boost, with 1200cc injectors. Works very well, no need to use an external fuel pres. regulator (although I bought everything to do a return-fuel system incase I ran out of fuel, which to date is not an issue).

Quote:
Originally Posted by GuidoK View Post
For the 3.0si/z4m thats maybe less of an issue as they run on a fairly high pressure (I estimate 5 bar or so) but the 3.0i pump is regulated at 3,5bar (as far as capacity goes its the same internal pump I believe), so if you have 0,5 bar boost, that leaves 3.0 bar fuelpressure to get proper atomazation in/from your injectors.
With boost and thus the large pressure difference between vacuum and full boost I think boost/vacuum dependant regulated pressure would be better with the proper tuning (different fuel pressure automatically means new tuning of course).
I have a 3.0i and 2.5 pump here as well, and those pumps are different. Must be the 3.0si/Z4M which utilize a more powerful pump.

Quote:
Originally Posted by GuidoK View Post
This is btw the fuelpump on the m54 (pre-fl) versions:
Can length is 82mm, overall lenght (without the barbs/connector) is 97mm.
Can thickness is 39/46mm
No fancy qr code yet on this version, too old (these are the only markings)

I'm not sure if its equivalent to the walbro 400 or 450. The 450 is e85 compatible and the 400 is the pump gas version of basically the same pump. I have no idea if a stock z4 is e85 compatible (we dont get that here afaik).
These bmw pumps are probably specifically made for bmw with non generic/bmw only electric connectors molded into the housing.
The pump above is not the same as any of the TI Automotive/Walbro pumps. The lower fatter section is actually smaller diameter. Most likely a different vendor/pump model.

You are probably right - who knows exactly what the flow rate of the OEM pump really is, but the fact this pump is flowing enough with quite a bit of headroom, I suspect it is very close to the Walbro 400 in output. 1200cc, 6cyl, 72psi, 500whp (or ~600bhp if you incorporate 15% drivetrain), and 45% duty cycle, quite a bit more left in it...
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      08-01-2017, 09:00 PM   #4
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Quote:
I don't agree 100%! I'm running the OEM setup just fine. The trick is to run a solid state fuel pump controller. I am running 25psi at idle, ramping up to 72psi at boost,
But your fuel pump controller is regulated by your intake manifold pressure sensor? thats a bit the same as a vacuum controlled pressure regulator, only done electrically (and thus probably with a lot more tuning possibilities). But the stock z4 doesnt have that possibility, at least not with the m54 engine), because that engine doesnt have a manifold pressure sensor (I was looking at the problem from my situation)




Do you have a picture of the 3.0si/z4m pump? (preferably with the numbers)

Is the white assembly also different?
Whats the difference in diamater in the lower fatter part? (mine is 45.41mm to be exact )

Pump can also be an earlier style model (m54 is of course an older engine, ive seen that the ridge between the thick and thin can part is more straight on the one in my pic compared to the current TI/walbro design). Manufacturers usually stay very long with the same OEM, especially bmw.
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Last edited by GuidoK; 08-01-2017 at 09:14 PM.
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      08-01-2017, 09:39 PM   #5
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Yes, you're correct. Obviously, the AEM Infinity gives me the ability to control fuel pump pressure based on manifold pressures, thus a pseudo-pressure regulator if you will. The OEM system (N52 at least) does regulate the fuel pump as well, but it is based off of other things instead of manifold vacuum. I am not using the OEM fuel pump controller since I don't know the CAN messaging to control it.

I do have pics of the pump, let me find a way to host them! Diameter of the bottom section is 51.14mm, and it has another lip between it and the main body housing. The part number for the OEM fuel pump assembly from BMW is: 16117198099. Also, the bottom portion of the pump and the sock are identical to what I got from Walbro.

I mentioned all the numbers in the first post.

And one more thing - I read that there was a fuel pump recall a while back for Z4s. Wonder if this pump assy. was updated since then...

Quote:
Originally Posted by GuidoK View Post
But your fuel pump controller is regulated by your intake manifold pressure sensor? thats a bit the same as a vacuum controlled pressure regulator, only done electrically (and thus probably with a lot more tuning possibilities). But the stock z4 doesnt have that possibility, at least not with the m54 engine), because that engine doesnt have a manifold pressure sensor (I was looking at the problem from my situation)




Do you have a picture of the 3.0si/z4m pump? (preferably with the numbers)

Is the white assembly also different?
Whats the difference in diamater in the lower fatter part? (mine is 45.41mm to be exact )

Pump can also be an earlier style model (m54 is of course an older engine, ive seen that the ridge between the thick and thin can part is more straight on the one in my pic compared to the current TI/walbro design). Manufacturers usually stay very long with the same OEM, especially bmw.
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      08-01-2017, 10:16 PM   #6
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Quote:
Originally Posted by dre99gsx View Post
I do have pics of the pump, let me find a way to host them! Diameter of the bottom section is 51.14mm, and it has another lip between it and the main body housing.
Ok. Do you think a walbro 400 would fit the pre-facelift housing? (is that pre facelift assembly (the plastic part) different from the facelift one?)
I want to start monitoring fuel pressure continiously when driving to see if there are situations where it dives on places where you expect it to be high (so if the current pump can take the flow I need). (Im in the process of adding sensors (wideband o2, temps/pressures etc) and adding a monitoring computer/logger)
It would be nice to know if I could just swap it out with a walbro 400 if needed.
I have a spare pre fl fuel pump assembly so I can experiment a bit without demolising the one I'm using.
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      08-01-2017, 10:25 PM   #7
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I can slide the new Walbro into a spare housing I have here (actually the same one you have with the more narrower pump). The narrow pump has a black tube coming up from the pump, perhaps it is a relief valve? This isn't available on the newer units. The relief is just open with no tubing.

The inner plastic housing which locks in the pump is also different, but they are interchangeable.
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      08-01-2017, 10:41 PM   #8
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Yes, it looks like the small black tube goes to some kind of valve:

It goes to this:


The newer pumps probably have an internal relieve valve if its an open outlet (must have because if there was no valve it would pump into the tank )
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      08-04-2017, 06:08 PM   #9
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really interesting thread!!
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