Description
Forged Turbo Pistons
Forged aluminium pistons built for boost — Wilson rates this 4G15/4G15T set to 650 hp.
ForgedPiston construction
9.0:1Turbo comp. ratio
650 hpRated capacity
18 mmWrist pin dia.
Overview
A set of forged aluminium performance pistons for the Mitsubishi 4G15/4G15T. They replace the cast OEM pistons to withstand the higher cylinder pressures and heat of a turbocharged, high-boost build.
Aimed at Colt CZT/Ralliart turbo builds chasing more boost and power. The low-compression (9.0:1) turbo spec suits forced induction, while forged construction adds detonation and thermal safety margin over cast pistons.
Specifications
ConstructionForged aluminium alloy (exact grade not published — confirm)
Compression ratio9.0:1 low-compression turbo variant (confirm ratio of stocked set)
Wrist pin diameter18 mm
Bore sizes offeredStandard 75.5 mm plus 76 / 77 / 78 mm oversizes (confirm size of stocked set)
Power ratingUp to ~650 hp at ~2.0-2.3 bar, manufacturer-rated
Engine applicationMitsubishi 4G15 / 4G15T, 1,468 cc, 75.5 x 82 mm
Pistons per set4 (one per cylinder) — confirm
Part number— confirm —
What's in the box
- confirm — pistons, wrist pins and circlips
- verify piston ring set is included
Fitment
ApplicationMitsubishi 4G15T (turbo)
InstallMachine-shop fitment required: bore/hone to piston size, set ring gaps and piston-to-wall clearance, and rebalance the assembly.
Confirm bore size, compression ratio and head/valve-relief type (SOHC 12v vs DOHC 16v MIVEC) against your exact 4G15T before ordering — Wilson lists several variants.
Best suited for
Turbo builds
High-boost engines
Engine rebuilds
Manufacturer data is limited; the ~650 hp figure is Wilson's own rating, not an independent test. Forged pistons can run slightly noisier (piston slap) when cold.
Fast dispatchShips in 24–48h
Genuine productAuthentic Wilson Engineering
Easy returns10-day returns, unused items
Fitment helpWe'll confirm before you buy
Returns
Return within 7 days of purchase, provided the item is unused and in its original condition and packaging. Taxes are non-refundable.
We can’t take back parts that have been fitted or modified, unsealed electrical components, ECUs and sensors, opened gaskets, seals and o-rings, or clearance items. Parts we order in specifically for you can’t be returned for change of mind — we’ll tell you before you order if yours is a special order.
If a part is faulty, damaged in transit or isn’t what you ordered, we’ll put it right and cover the return shipping.
Please contact us before returning anything. Full terms are in our Refund policy.
Customer Reviews
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