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All Journal VANOS Journal of Mechanical Engineering Education MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering
Toto Sugiarto
Department of Automotive Engineering, Faculty of Engineering, Universitas Negeri Padang
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Industrial & Manufacturing Engineering

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Self-Efficacy as a Mediator between Practical Skills, Social Environment, and Vocational Students' Industrial Work Practice Readiness Muhammad Zakky Putra; Wagino Wagino; Toto Sugiarto; Milana Milana; Suhendar Suhendar; Edi Setiyo
VANOS Journal of Mechanical Engineering Education Vol 11, No 2 (2026)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/vanos.v11i2.38946

Abstract

Vocational graduates face a significant employment gap, with an Open Unemployment Rate of 8.63%, indicating a mismatch between graduate competencies and industrial demands. This study examines Self-Efficacy as a mediator between Practical Skills, Social Environmental Factors, Academic Activities, and Industrial Work Practice (Prakerin) readiness among vocational students. Using a quantitative explanatory approach, data were collected from 96 Grade XI Automotive Light Vehicle Engineering students at SMK Negeri 2 Lubuk Basung and analyzed via PLS-SEM with SmartPLS 4. Results revealed that Practical Skills exerted the strongest influence on Self-Efficacy (β=0.407; p
Mode-Dependent Effects of a Piggyback Throttle Controller on Torque and Power in a 1500 cc EFI Engine Farhat Ramadhan Ilza; Nuzul Hidayat; Toto Sugiarto; Iffarial Nanda; Jackly Muriban
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 8 No 1 (2026): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46574/motivection.v8i1.531

Abstract

The rising adoption of aftermarket devices in the car modification industry has heightened interest in the piggyback throttle controller as an effective means of modifying throttle response without substituting the original ECU. Nonetheless, its impact on torque and power remains inadequately substantiated through controlled experimentation. This study experimentally assessed the impact of a 9-Drive piggyback throttle controller on the performance parameters of a 2011 Toyota Yaris 1500 cc EFI engine utilizing a chassis dynamometer. The car underwent testing under four conditions: no treatment, Standard mode, F1 mode, and ECO mode, with each condition replicated three times. The findings indicated that F1 mode generated the maximum average torque, attaining 177.13 Nm, which was 15.03 Nm greater than the untreated condition. Conversely, ECO mode yielded the highest average power at 98.60 HP, whereas Standard mode exhibited just negligible variations in both metrics. The data demonstrate that the controller did not produce a consistent performance enhancement across all modes, but instead altered the engine's output characteristics in a mode-dependent fashion. Under the current testing conditions, F1 mode exhibited a more pronounced torque-oriented response, while ECO mode demonstrated marginally greater power output. The findings indicate that a piggyback throttle controller can alter engine response characteristics, however its impact must be assessed in relation to the chosen mode and the particular performance metric under evaluation.
Co-Authors Edi Setiyo Farhat Ramadhan Ilza Iffarial Nanda Jackly Muriban Milana Milana Muhammad Zakky Putra Nuzul Hidayat Suhendar Suhendar Wagino Wagino