Z4m40i
Well-Known Member
- First Name
- Justin
- Joined
- Nov 30, 2023
- Threads
- 9
- Messages
- 156
- Reaction score
- 175
- Location
- Salt Lake City
- Car(s)
- 2020 BMW z4 m40i, 2020 BMW X7 40i
- Thread starter
- #1
Finally got around to doing some proper testing on the ZTK pump at The Circuit at Button Willow to compare it against my old plastic adjusting ring pump. I haven’t seen any real data showing the ZTK pump having higher output, so this was a good chance to find out for myself.
Shout-out to @speedlogic for turning these pumparound in a single day.
Background: Oil Pressure Issues on Track
As a 2020 MY car, I’ve consistently run into oil pressure drops on track once oil temps climb above ~260 °F using 5W-40. After adding the Verus Engineering Oil Cooler Kit, the pressure drop began a bit earlier—around 255 °F—but the cooler did help stabilize temps overall and delay how quickly I’d hit that critical threshold.
Low oil pressure isn’t just a durability concern; it directly affects VANOS exhaust cam timing. Excessive cam walk can trigger limp mode, and when running a larger HPFP, additional load on the exhaust cam compounds the issue. One common strategy for DI cars is increasing oil pressure to help keep cam timing in check. Unfortunately, even after my tuner raised the pressure target, the plastic pump struggled to hit or maintain it. Switching to 5W-50 bought me a bit more headroom—up to around 275 °F—before pressure started to taper off again.
ZTK Pump Overview
The ZTK pump was originally used in G20 track package cars equipped with an external cooler. It became standard across all BMW and Supra applications starting with the 2022 model year (PN 11-41-8-646-453).
Unlike some early plastic adjusting ring pumps, I didn’t experience the typical failure symptoms with my unit—no oil level reading issues, no stuck-high pressure triggering emergency mode, and no low-pressure faults. That said, its inability to maintain pressure under high-temperature track conditions was still a limiting factor.
Data Log Comparison
**data logs are in PSIG. Please add ~14.7psi for PSIA conversion**
Data log 5w40 old pump
Here’s a screen shot with the old pump. Notice oil temperature is at ~255F, and oil pressure off target by nearly 14 PSI. Actually, for the entirety of the straight, you can see in the highlighted section that the pump fails to hit target.
Additionally, we can see our cam walk. You’ll notice highlighted in red that cam falls off target by 17% towards redline. The red arrows notate where cam timing deviates.
Data log 5w40 new pump
Here’s a screenshot of the new pump. Oil temp is even higher at 267F. We can see oil pressure highlighted, and both actual and target values are completely superimposed over each other. VANOS Exhaust actual and target are also both completely superimposed throughout the pull.
Based on the results, it’s clear to me the ZTK pump is confirmed to have higher output than the older pumps.
Shout-out to @speedlogic for turning these pumparound in a single day.
Background: Oil Pressure Issues on Track
As a 2020 MY car, I’ve consistently run into oil pressure drops on track once oil temps climb above ~260 °F using 5W-40. After adding the Verus Engineering Oil Cooler Kit, the pressure drop began a bit earlier—around 255 °F—but the cooler did help stabilize temps overall and delay how quickly I’d hit that critical threshold.
Low oil pressure isn’t just a durability concern; it directly affects VANOS exhaust cam timing. Excessive cam walk can trigger limp mode, and when running a larger HPFP, additional load on the exhaust cam compounds the issue. One common strategy for DI cars is increasing oil pressure to help keep cam timing in check. Unfortunately, even after my tuner raised the pressure target, the plastic pump struggled to hit or maintain it. Switching to 5W-50 bought me a bit more headroom—up to around 275 °F—before pressure started to taper off again.
ZTK Pump Overview
The ZTK pump was originally used in G20 track package cars equipped with an external cooler. It became standard across all BMW and Supra applications starting with the 2022 model year (PN 11-41-8-646-453).
Unlike some early plastic adjusting ring pumps, I didn’t experience the typical failure symptoms with my unit—no oil level reading issues, no stuck-high pressure triggering emergency mode, and no low-pressure faults. That said, its inability to maintain pressure under high-temperature track conditions was still a limiting factor.
Data Log Comparison
**data logs are in PSIG. Please add ~14.7psi for PSIA conversion**
Data log 5w40 old pump
Here’s a screen shot with the old pump. Notice oil temperature is at ~255F, and oil pressure off target by nearly 14 PSI. Actually, for the entirety of the straight, you can see in the highlighted section that the pump fails to hit target.
Additionally, we can see our cam walk. You’ll notice highlighted in red that cam falls off target by 17% towards redline. The red arrows notate where cam timing deviates.
Data log 5w40 new pump
Here’s a screenshot of the new pump. Oil temp is even higher at 267F. We can see oil pressure highlighted, and both actual and target values are completely superimposed over each other. VANOS Exhaust actual and target are also both completely superimposed throughout the pull.
Based on the results, it’s clear to me the ZTK pump is confirmed to have higher output than the older pumps.
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