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Kelford camshafts, Subaru EJ25 STI, intake AVCS and slot trigger (2004-2007)
1 262,00 €
Kelford camshafts for the Subaru EJ25 STI, intake AVCS and slot trigger engine. Choose a profile to suit your engine parts and intended use. Profile specifications and required modifications are detailed below.
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Kelford is a New Zealand camshaft manufacturer with roots in Christchurch dating back to 1968. Its profiles range from upgrades for street-driven cars to fully built race engines. Choose the cam around the rest of the engine and its intended use, rather than simply picking the longest duration.
This selection is for the Subaru EJ25 STI, intake AVCS and slot trigger engine. Profile differences, spring recommendations and required modifications are detailed below.
Technical specifications – available profiles for this engine
Profile R-199-A
Torque and throttle-response profile for a near-stock engine. Suits rally classes using a 36 mm intake restrictor and a 46–54 mm turbo. Recommended springs: KVS109-STI. The intake cam has a rear slot/key-type sensor drive. AVCS operates on the intake side only.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 9.75mm | 9.75mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 9.55mm | 9.50mm |
| Advertised duration @ 0.25mm | 256° | 260° |
| Duration @ 1.00mm valve lift | 218° | 222° |
| Timing IVO @ 1.00mm valve lift | 21 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 59 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 44 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 2 BTDC |
| Suggested centre lines | 130° | 113° |
| Valve lift at TDC | – | 0.83 mm |
Manufacturer profile information
Profile R-199-B
Higher-lift circuit and rally profile for a 54–60 mm turbo, focused on throttle response and mid-range pull. Requires shimless buckets. Recommended springs: KVS1847-BT. The intake cam has a rear slot/key-type sensor drive, with intake-only AVCS.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 10.90mm | 10.45mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 10.70mm | 10.20mm |
| Advertised duration @ 0.10mm | 264° | 260° |
| Duration @ 1.00mm valve lift | 230° | 226° |
| Timing IVO @ 1.00mm valve lift | 15 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 65 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 46 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 0 TDC |
| Suggested centre lines | 130° | 113° |
| Valve lift at TDC | 0.15mm | 0.99 mm |
Manufacturer profile information
Profile R-199-C
Race profile for a built engine with a 58–66 mm turbo and fuel such as E85. Requires head machining for cam clearance and shimless buckets. Recommended springs: KVS1847-BT. Uses a slot/key-type intake sensor drive and intake-only AVCS.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 11.50mm | 10.75mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.30mm | 10.50mm |
| Advertised duration @ 0.10mm | 272° | 268° |
| Duration @ 1.00mm valve lift | 236° | 232° |
| Timing IVO @ 1.00mm valve lift | 12 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 68 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 49 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 3 ATDC |
| Suggested centre lines | 130° | 113° |
| Valve lift at TDC | 0.25mm | 1.29 mm |
Manufacturer profile information
Profile R-199-D
Top-end-focused race profile for a 64–72 mm turbo, a larger intake manifold and E85. Requires head machining for the high-lift lobes and shimless buckets. Recommended springs: KVS1847-BT. Uses a slot/key-type intake sensor drive and intake-only AVCS.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 11.70mm | 11.25mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.50mm | 11.00mm |
| Advertised duration @ 0.10mm | 282° | 278° |
| Duration @ 1.00mm valve lift | 244° | 242° |
| Timing IVO @ 1.00mm valve lift | 8 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 72 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 54 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 8 ATDC |
| Suggested centre lines | 130° | 113° |
| Valve lift at TDC | 0.47mm | 1.74 mm |
Manufacturer profile information
Profile R-199-E
Drag profile for high rpm and boost. Intended for a ported head, 1 mm oversize valves and a turbo of at least 67 mm. For E85 or methanol. Requires fixed cam timing and AVCS removal. Recommended springs: KVS1847-BT. The intake cam has a rear slot/key-type sensor drive.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 11.20mm | 11.25mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.00mm | 11.00mm |
| Advertised duration @ 0.25mm | 292° | 294° |
| Duration @ 1.00mm valve lift | 250° | 252° |
| Timing IVO @ 1.00mm valve lift | 13 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 57 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 64 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 8 ATDC |
| Suggested centre lines | 112° | 118° |
| Valve lift at TDC | 2.42mm | 1.85 mm |
Manufacturer profile information
Checking heights are shown with the duration figures. Net lift is the net valve movement specified by the manufacturer, while cam lift is listed separately. IVO/IVC denote intake valve opening/closing and EVO/EVC exhaust valve opening/closing. BTDC/ATDC mean before/after top dead centre, and BBDC/ABDC before/after bottom dead centre.
Installation and profile selection
Confirm the exact engine version, valvetrain design and the modifications required by the profile. Check cam timing and valve-to-piston clearance during installation. Springs, lifters and other supporting parts mentioned with a profile are not included unless the profile explicitly states that they come with the kit.
Examples of related vehicle applications
- Subaru Impreza WRX STI GD/GG EJ257 (2004–2007), USDM ura-/kiilatriggeri
The list covers versions with the specified engines only. Exact fitment and required modifications depend on the selected profile, cylinder head, lifters and timing system.
| Weight | 10 kg |
|---|---|
| Brand |
