ETENWOLF EV3 Tire Inflator Pressure Accuracy Test Report — Mountain Bike 4# (0–45 PSI, 10 Sequences)

Document Overview

Key Findings The ETENWOLF EV3 tire inflator completed 10 sequential inflation accuracy tests on a mountain bike tire across the 0–45 PSI range, with all stop-pressure readings within ±0.7 PSI of preset targets and all 10-second hold readings within ±0.5 PSI, confirming consistent pressure accuracy…

Document type
Test Report
Prepared by
Daniel Wright
Published
Last reviewed
Topics
Motor Performance

Key Findings

The ETENWOLF EV3 tire inflator completed 10 sequential inflation accuracy tests on a mountain bike tire across the 0–45 PSI range, with all stop-pressure readings within ±0.7 PSI of preset targets and all 10-second hold readings within ±0.5 PSI, confirming consistent pressure accuracy and valve retention performance.

  • Product: EV3-4# Tire Inflator
  • Test Date: 2025-04-08
  • Tire Type: Mountain Bike (山地自行车)
  • Pressure Range Tested: 0–45 PSI across 10 incremental sequences
  • Maximum Stop-Pressure Deviation: +0.7 PSI (Row 3, preset 20 PSI)
  • Maximum Accuracy Deviation (vs. preset): 0.4 PSI (Row 3)
  • Maximum Pressure Drop at 10 s Hold: −0.4 PSI (Row 2)
  • Operator Organization: BTK
  • Result: All sequences within acceptable accuracy tolerance

Test Overview

Item Detail
Test Type Pressure Accuracy / Motor Performance
Report / Sheet EV3-山地车-4 (Sheet 5 of 8)
Source File EV3充气泵-精度测试-2025.4.26.xlsx
Test Date 2025-04-08
Product Model EV3-4#
Product Line Inflation Tools
Category Air Pump / Compressor Products (气泵类项目)
Tire Type Under Test Mountain Bike (山地自行车)
Operating Organization BTK
Total Sibling Sheets 8 (EV3-4#, EV3-5#, EV3-6#, EV3-山地车-4, EV3-山地车-5, EV3-山地车-6, EV3-公路自行车-8, EV3-公路自行车-9)
Total Data Rows 10 test sequences

Test Equipment & Setup

Parameter Value / Description
Unit Under Test ETENWOLF EV3 Tire Inflator, Model EV3-4#
Tire Type Mountain Bike (山地自行车)
Pressure Unit PSI
Preset Pressure Range 15 PSI – 45 PSI (target stop values)
Inflation Start Range 0 PSI, 15 PSI, 20 PSI, 25 PSI, 30 PSI, 35 PSI (lower bounds per sequence)
Hold Duration for Post-Stop Reading 10 seconds
Measured Parameters Stop Pressure (PSI), Pressure at 10 s hold (PSI), Retention Difference (差值·保压), Accuracy Difference (差值·精度)
Difference — Retention (差值·保压) Pressure at 10 s minus Stop Pressure (negative = pressure drop)
Difference — Accuracy (差值·精度) Absolute deviation of 10 s pressure from preset target

Test Procedure

  1. Pre-Test: Confirm the EV3-4# unit is fully charged and the pressure sensor is zeroed. Mount the inflation nozzle onto the mountain bike tire valve.
  2. Set Preset Pressure: Enter the target preset pressure (PSI) into the EV3 unit via the control interface.
  3. Inflate: Begin inflation from the stated starting pressure (打气值 lower bound) toward the preset target. The unit auto-stops when the internal sensor reaches the preset value.
  4. Record Stop Pressure: Immediately read and record the displayed pressure at the moment the unit stops (停止气压).
  5. 10-Second Hold: Keep the nozzle connected. After 10 seconds, read and record the displayed pressure (停止10s气压).
  6. Calculate Retention Difference (差值·保压): Subtract Stop Pressure from the 10 s Pressure. A negative value indicates pressure loss after auto-stop.
  7. Calculate Accuracy Difference (差值·精度): Compute the absolute deviation of the 10 s pressure from the preset target value.
  8. Post-Test: Disconnect nozzle, allow tire to return to ambient conditions, and repeat for the next sequence.
  9. Acceptance Criteria: All accuracy differences (差值·精度) must remain within the product specification tolerance. All retention differences must indicate stable valve seating with no abnormal pressure loss.

Test Data & Results

No. Tire Type Inflation Range (PSI) Preset Pressure (PSI) Stop Pressure (PSI) Pressure at 10 s (PSI) Retention Diff (PSI) Accuracy Diff (PSI) Remarks
1 Mountain Bike 0–15 15 15.6 15.3 −0.30 0.30
2 Mountain Bike 15–45 45 45.5 45.1 −0.40 0.10
3 Mountain Bike 0–20 20 20.7 20.4 −0.30 0.40
4 Mountain Bike 20–45 45 45.3 45.1 −0.20 0.10
5 Mountain Bike 0–25 25 25.5 25.2 −0.30 0.20
6 Mountain Bike 25–45 45 45.5 45.2 −0.30 0.20
7 Mountain Bike 0–30 30 30.4 30.1 −0.30 0.10
8 Mountain Bike 30–45 45 45.3 45.0 −0.30 0.00
9 Mountain Bike 0–35 35 35.6 35.3 −0.30 0.30
10 Mountain Bike 35–45 45 45.3 45.1 −0.20 0.10

Observations: Across all 10 sequences the EV3 consistently over-inflated slightly before auto-stop (stop pressure 0.3–0.7 PSI above preset), which is typical of sensor-triggered cut-off latency. The 10-second hold readings show a uniform pressure drop of approximately 0.20–0.40 PSI, indicating minor but stable post-stop bleed-back through the valve rather than a leak. The largest accuracy deviation of 0.40 PSI occurred in Row 3 (preset 20 PSI); the smallest was 0.00 PSI in Row 8 (preset 45 PSI, starting from 30 PSI). All sequences targeting 45 PSI from a mid-range start showed tighter accuracy (≤0.20 PSI), suggesting the auto-stop algorithm performs best in the upper half of the mountain bike pressure range.

Conclusion

Item Detail
Product ETENWOLF EV3-4# Tire Inflator
Test Scope Pressure accuracy across 10 sequential inflation runs, mountain bike tire, 0–45 PSI
Standard / Criteria Internal product accuracy specification (BTK); accuracy difference and retention difference within tolerance
Samples Tested 1 unit (EV3-4#)
Max Accuracy Deviation Observed 0.40 PSI (Row 3, preset 20 PSI)
Max Retention Deviation Observed −0.40 PSI (Row 2, preset 45 PSI from 15 PSI start)
Verdict PASS — All 10 sequences within acceptable accuracy and retention tolerances

Document Information

Role Name Detail
Operating Organization BTK Recorded on test sheet header
Test Date — 2025-04-08
Source File — EV3充气泵-精度测试-2025.4.26.xlsx
Sheet Name — EV3-山地车-4 (Sheet index 4, total 8 sheets)
Article Author Daniel Wright daniel.wright

Frequently Asked Questions

What pressure accuracy can I expect from the ETENWOLF EV3 tire inflator on a mountain bike tire?

In testing across 10 sequential inflation runs from 0–45 PSI, the EV3 achieved a maximum accuracy deviation of 0.40 PSI from the preset target, measured 10 seconds after auto-stop. Most runs came in at 0.10–0.30 PSI deviation, which is within the normal tolerance for consumer-grade digital tire inflators.

Why does the EV3 stop slightly above the preset pressure?

The auto-stop mechanism relies on an internal pressure sensor that triggers a motor cut-off. A small amount of air continues to flow through the hose after the motor stops, causing the displayed pressure to peak 0.3–0.7 PSI above the preset before settling. This overshoot is a known characteristic of sensor-triggered cut-off and is accounted for in the accuracy specification.

How much pressure does the EV3 lose in the 10 seconds after it stops inflating?

Across all 10 test sequences, the EV3 showed a post-stop pressure drop of 0.20–0.40 PSI within 10 seconds. This is consistent with minor valve bleed-back when the nozzle is still connected and does not indicate a leak in the tire or the inflator.

Is the EV3 suitable for mountain bike tires across the full 0–45 PSI range?

Yes. The test covered a full matrix of starting and ending pressures from 0 PSI to 45 PSI across 10 sequences. All results passed the internal BTK accuracy criteria, confirming the EV3-4# is suitable for mountain bike tire inflation across this entire range.

Related Products

The following test reports are from the same EV3 accuracy test file and cover additional valve types and pressure ranges: