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All Journal Jurnal Bisnis, Logistik dan Supply Chain Jurnal Riset Rumpun Ilmu Teknik (JURRITEK)
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance

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Analisis Penggantian Exhaust System terhadap Performance Engine type 2NR-VE Ahmad Fahmi; Tatang Permana
JURAL RISET RUMPUN ILMU TEKNIK Vol. 5 No. 1 (2026): April: Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v5i1.7879

Abstract

Engine performance is a critical parameter in automotive engineering as it directly affects power output, torque characteristics, and overall vehicle efficiency. One of the components that significantly influences engine performance is the exhaust system, which regulates exhaust gas flow and back pressure. This study aims to experimentally analyze the effect of replacing a standard exhaust system with an aftermarket exhaust system on the performance of a 2NR-VE engine. The research employed an experimental method using a comparative design with two testing conditions: a factory-standard exhaust system and an aftermarket exhaust system. Engine performance testing was conducted using a dynamometer (dyno test) to measure horsepower and torque across various engine speed ranges (RPM). Each testing condition was performed repeatedly, and the resulting data were averaged to reduce measurement errors and minimize the influence of operational fluctuations. The experimental results indicate that the aftermarket exhaust system significantly improves engine performance. The maximum power increased from 82.5 HP to 91.6 HP, while the maximum torque rose from 131.2 Nm to 154.4 Nm. These improvements suggest that the aftermarket exhaust configuration effectively reduces exhaust back pressure and enhances exhaust gas flow efficiency. Therefore, replacing the exhaust system can be considered an effective approach to improving engine performance, provided that the modification is technically appropriate and complies with applicable emission and noise regulations.
USULAN PERENCANAAN PRODUKSI UNTUK MENGURANGI BULLWHIP EFFECT PADA PT. XYZ DENGAN MODEL HOLT-WINTERS Amelia Aura Ghania; Tatang Permana; Hanissa Okitasari
Jurnal Bisnis, Logistik dan Supply Chain (BLOGCHAIN) Vol. 5 No. 2 (2025): Jurnal Bisnis, Logistik dan Supply Chain
Publisher : Program Studi Administrasi Bisnis, Institut Bisnis dan Informatika (IBI) Kosgoro 1957

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55122/blogchain.v5i2.1888

Abstract

Fenomena bullwhip effect yang menyebabkan ketidakstabilan permintaan dalam rantai pasok sering menjadi tantangan bagi sebuah perusahaan, seperti yang terjadi pada PT. XYZ. Penelitian ini bertujuan untuk mengurangi bullwhip effect pada rantai pasok PT. XYZ melalui metode peramalan Holt-Winters. Data primer berupa volume produksi dan penjualan selama tahun 2023 dianalisis untuk mendeteksi bullwhip effect, yang ditunjukkan dengan nilai BE > 1,039 pada semua produk. Setelah penerapan peramalan Holt-Winters, nilai BE menurun secara signifikan di bawah ambang batas, menunjukkan peningkatan stabilitas rantai pasok. Hasil uji akurasi peramalan melalui MAPE, MSE, dan SDE menunjukkan nilai error yang memenuhi standar, sementara validasi menggunakan grafik moving range menunjukkan hasil peramalan yang valid. Dengan demikian, metode ini terbukti efektif untuk meningkatkan efisiensi perencanaan produksi dan profitabilitas PT. XYZ.
Co-Authors Ahmad Fahmi Amelia Aura Ghania Hanissa Okitasari