HPT F2 6870 vs. F3 6870 – Which Turbo is Right for You?

The HPT F2 6870 and F3 6870 turbos are often compared, and with good reason. Both models are designed for high-performance builds, but they offer subtle differences that can influence which one is the best fit for your setup. Below is a breakdown to help you choose the right turbo.

Comparison of the HPT F2 6870 and the HPT F3 6870 Billet Dual Ball Bearing Turbochargers

Model	HPT F2 6870	HPT F3 6870
Horsepower Rating	1150 HP	1150 HP
Compressor Housing	4" Ported Inlet, 2.5" Outlet	4" Ported Inlet, 3" Outlet
Turbo Weight with T4 Housing	19 lbs	20.5 lbs
Turbo Weight with V-Band	15 lbs	21 lbs
Turbine Housing Options	T3 Inlet, V-Band Discharge 1.10 A/R	T4 Inlet, V-Band Discharge 0.82 & 0.96 A/R
	T4 Divided 0.84 A/R	T4 Divided 1.00 A/R
	V-Band Inlet 1.07 A/R (2.25" Inlet)	V-Band Inlet 0.96 A/R (3" Inlet)
Outlet Connection	3.625” OD, Flanges for 3” & 3.5”	4.28” OD, Flanges for 3.5” & 4”

Shared Core Features

Both models feature dual ball bearing center sections, 68mm compressor wheels, 70mm turbine wheels, and are capable of 1150 HP. These similarities ensure durability and performance across various builds.

Key Differences

Compressor Housing & Outlet Size

F2 6870: 2.5" outlet—better for setups with smaller charge piping.
F3 6870: 3" outlet—ideal for larger piping and better high-RPM airflow.

Pro tip: If your build uses 2.5” piping, the F2 is a simpler fit. For 3” piping or future-proofing, the F3 is a better option.

Weight Comparison

F2 6870: Lighter (15 lbs with V-band).
F3 6870: Heavier (21 lbs with V-band), adding robustness for high-boost applications.

Tip: Choose the F2 for lightweight builds. The F3 suits higher-boost setups where strength is key.

Turbine Housing Options

F2 6870: Offers both T3 and T4 options, with quicker spooling for smaller engines.
F3 6870: Only T4 and V-band inlets, optimized for larger engines and higher power builds.

Pro Tip: Use the F2 if you need a T3 housing. The F3 excels with T4 setups, delivering more flow for high-performance applications.

Outlet Flanges

F2 6870: 3.625” OD, supports 3” and 3.5” exhaust setups.
F3 6870: 4.28” OD, designed for 3.5” and 4” flanges.

Which Turbo is Right for You?

Choose the F2 6870 if:
- You need lightweight performance with quick spool.
- Your build uses T3 housings or 2.5” charge piping.

Choose the F3 6870 if:
- You need quick spool and more airflow for maximum power.
- Your setup already uses T4 housings or 3” piping.

Both the F2 6870 and F3 6870 deliver HPT’s fast spooling power. Their shared features—dual ball bearings, 68mm compressor wheels, 70mm turbine wheels, and 1150 HP capability—make them suitable for many builds. If you still need some advice, contact our team, and we’ll help you find the perfect HPT turbocharger for your build!