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Old 01-22-2013, 07:36 PM   #1
Scooby Newbie
Member#: 315446
Join Date: Apr 2012
Location: Trinidad
2004 Impreza 2.5L

Default Can Stock Spring and Retainers work.

need some advice.
Is anyone using TWE stage 2 cams, for the 2.5 SOHC with stock valve springs and retainers, or do I need the TWE springs and retainers?
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Old 01-22-2013, 11:21 PM   #2
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: Central Floriderp

Quoted from TWE website

Impreza RS, TS, Outback, Legacy, Baja, Forester
These TechWorks designed cams provide a large increase in power throughout the entire power range by opening the cams faster and farther within essentially the same time (duration). The unaltered duration is necessary due the stock Subaru engine controller. This allows a performance increase to be realized without the necessity of upgrading or altering the stock engine controller. Shown with our Heavy Duty Valve Springs (strongly recommended) and with our titanium retainers.

Subaru RS 2.5 SOHC Specifications:


Stock Cam TWE
Intake Exhaust Intake Exhaust
Valve Lift (Inches) 0.376 0.314 0.437 0.367
Duration (Degrees) 181 182 211 206

Last edited by GrundleJuice; 01-22-2013 at 11:33 PM.
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Old 01-24-2013, 01:11 AM   #3
mod maniac
Scooby Specialist
Member#: 300551
Join Date: Nov 2011
Chapter/Region: SCIC
Location: mariposa ca.
2002 FOZ STI 2.34
Fullers Garage


yes stock springs and retainers can work but is it a good idea? NO
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