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Description
034 Motorsport Supertech Valve Spring & Titanium Retainer Set, Audi EA837 3.0T & EA839 2.9T/3.0T EnginesThe Supertech Performance Valve Spring & Retainer Set is designed for those looking to improve the powerband of their 3. 0T Supercharged EA837 or 2. 9T 3. 0T Turbocharged EA839 engine past 7,200 7,600 RPM, safely. This kit takes a two pronged approach by increasing the spring rates meanwhile reducing the mass of the retainer, by using titanium. The use of titanium provides an adequate fatigue life to be acceptable for all but the highest mileage
The Supertech Performance Valve Spring & Retainer Set is designed for those looking to improve the powerband of their 3.0T Supercharged EA837 or 2.9T/3.0T Turbocharged EA839 engine past 7,200 - 7,600 RPM, safely. This kit takes a two pronged approach by increasing the spring rates meanwhile reducing the mass of the retainer, by using titanium. The use of titanium provides an adequate fatigue life to be acceptable for all but the highest mileage street use. In addition, the retainer allows a longer spring to further prevent coil bind and allow camshafts with higher lift than factory.
These will allow usage up to 8,000 RPM although we have used them for occasional use to 8,500 RPM on hydraulic lifters. More RPM is possible by converting to solid lifter buckets as there is plenty of spring rate, upgraded rods should be considered when revving over 8000 RPM as well.
FEATURES:
- Performance Valve Springs Made with Premium Superclean Chrome Silicon Vanadium Steel Alloy for Higher Performance and Durability
- Increased Spring Rate to Stretch the Powerband of the 3.0T/2.9T Engine Out Past 7,600 RPM, Safely.
- NOTE: Above 7600RPM, Factory Rods Should Be Updated Unless Specified by the Tuner to be OK.
- 6AL4V Grade Titanium Retainers for Reduced Mass, Helping to Prevent Valve Float
- Allows up to 8,000 RPM (Occasional Use to 8,500 RPM on Hydraulic Lifters)
- More RPM is Possible by Converting to Solid Lifter Buckets
- Complete Set of 24 Springs and Retainers
SPRING DATA:
- Seat Pressure - 73lbs @ 38.60mm (Intake), 85lbs @ 37.20mm (Exhaust)
- Open (Lift) Pressure - 178lbs @ 10mm (Intake), 190lbs @ 10mm (Exhaust)
- Max lift - 12.50mm (Intake), 11.00mm (Exhaust)
- Spring Coil Bind - 24.90mm
- Rate - 10.50lbs/mm
- Spring Outer Diameter - 24.00mm
- Spring Inner Diameter - 16.50mm
WHAT’S INCLUDED:
- Single Springs - 24pcs
- Titanium Retainers - 24pcs
Shipping Notes
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4.7 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 4
Enjoyable, entertaining, engrossing
Format: Kindle
The Three Women, their JMT trail name, is a delightful read. You experience the beauty of nature and the wonders seen in the trail. You also experience the fear and anxiety that come with making such a trek. The bonds of friendship and support between the three and also all the other through hikers. An amazing read, the perfect balance of nature, friendship, compassion, struggle, and determination. Immerse yourself in this well written book.
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Reviewed in the United States on April 23, 2024
★★★★★ 5
An epic adventure, page after page!
Format: Paperback
Many women dream of making this hike (I once did) but few lace up their boots and get on the trail. And even a tiny fraction of those who DO realize their goal, could capture the experience like Joan Griffin. I read several chapters a night and always looked forward to getting back on the trail with her from my rocking chair.
The grandeur of the sights, the wonder of seeing the world well above 8,000 feet ~ for 27 days ~ reads like a personal diary. Every perspective, high and low, is captured: the practical issues of carrying on even with a twisted ankle on Day 1, then blisters, surviving sudden weather changes, confronting inner doubts, securing essential food and water, and losing the camera enrich the book in an authentic style.
In between all this, the reader remembers that it all took place with 40 pound backpacks on their backs!
It's a magical but real-life journey with the inevitable personality differences of the Three Women, as well as their uniquely personal reasons to hike. As the brave heroes arrive to the finish line, one is aware of the power of grace that accompanied them all along.
Yes, this experience changed the hikers but it also changes the reader. Being aware of those who live curiously and courageously provides a kind of encouragement for us to do the same, even after age 50.
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Reviewed in the United States on October 12, 2024
★★★★★ 5
Inspirational Read
Format: Paperback, Format: Paperback
Griffin, J. M. (2023). Force of nature: Three women tackle the John Muir Trail. Black Rose Writing.
Joan Griffin loves exploring and lives in the Northern California foothills of the Sierra Nevada.
Five legs, 27 days, 195.9 miles, this is a memoir of three 50+ women hiking the John Muir Trail located in the Sierra Nevada Mountain range. Each day receives its own chapter providing a vivid description of the trail, challenges, and beauty. Walking created an "unpredictable reality," that was "bigger in every conceivable way than [her] imagination could have conjured." As you read through the story, you are transported to the trail, so vivid her recollections and descriptions of their experiences. She wore a necklace with the words strength, courage, and spirit; a mantra that served her well along the journey. Griffin found: "I found my very soul had acclimated to the natural world, and I was completely in tune with the Earth and the sky and the water surrounding me." Such an inspiring memoir!
This would be a good read for 50+ women who need a good dose of inspiration, those who like travel memoirs, and those interested in long-haul walking.
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Reviewed in the United States on October 23, 2024
★★★★★ 5
Arm chair traveling on a cold winter retreat
Format: Paperback
This was the perfect book to get me back into reading! I’ve happily filled my evenings, transported to the John Muir Trail traveled by The Three Women. Your descriptions of such an immense beauty and reflections of your personal journey were at times like being on the trail with you all!
An inspirational read!
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Reviewed in the United States on December 29, 2025
★★★★★ 4
A great tale of women trekking together
Format: Kindle
This is well -written, enjoyable to read, and like the three women on the trail as a reader you don't want it to end as they near the end of the JMT. Filled with beautiful descriptions of scenery, humorous retelling of some difficult days, and interesting encounters with other people. Even for the non-hiker this book is a fun read.
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Reviewed in the United States on January 18, 2024
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