JDM FWD /// platform file
Honda Civic / Integra (B18) build guide
B18C · 1.8 NA VTEC I4. What the stock hardware reliably supports, where it breaks first, and the fastest safe path to more.
The Honda Civic / Integra (B18) makes 195 hp stock at roughly 2,600 lb (13.3 lb/hp). Its stock internals are good for about 400 hp, the fuel system for around 250 hp, and its naturally aspirated setup tops out around 240 hp without forced induction. Below is the limit sheet carbuildcheck analyzes against, plus the platform's documented weak points.
01 Factory card
Stock power195 hp
Curb weight2,600 lb · 13.3 lb/hp
LayoutFWD
InductionNaturally aspirated
02 What stock parts support
Engine internals~400 hp
Fuel system~250 hp
Induction ceiling~240 hp
Clutch (manual)~230 hp
Transmission (auto/DCT)~260 hp
Cooling (sustained)~300 hp
Community-documented crank-hp planning figures, conservative by design. How these are used in the score →
03 Where it breaks first
The original budget-boost classic — stock-internals B-series live happily around 300 hp with a proper tune and honest boost control.
It’s a 90s chassis: bushings, hubs, axles and rust checks before power. The chassis refresh is the real stage 1.
04 The typical path
Intake → headers → tune → cams or forced induction. NA gains are honest but small; the big unlock is boost, and boost starts at the fuel system.
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