Video summary
Porsche 911 ST By Rennsport – Car #100, The Ultimate Porsche Build | Carfection 4K
Main summary
Key takeaways
Product reviewed
Porsche 911 ST “Car #100” by Rennsport Built from an early/mid-80s donor 911 and tailored to an individual buyer’s brief. This specific car was designated #100 for Japan.
Key features mentioned
Custom rebuild program
- Rennsport takes early 911s / mid-80s 911s (often late-80s donors).
- They work with the customer to define how the car will be used.
- The correct donor vehicle is then sourced to match that brief.
Road-focused interpretation of race heritage
- Inspired by club racing cars from the late 1970s to the mid-1980s.
- Purpose-built to be more powerful, comfortable, and stylish than a pure track/race conversion.
- Still carries “ST / race DNA,” but is designed to be enjoyable on the road.
Engine upgrade and electronics
- Donor: 1987 3.2 Carrera G50 (mentioned as the last “proper 911s” with torsion bars).
- Retains the original crank case to preserve engine number / identity tied to the chassis.
- Rebuilt 3.2 flat-six upgraded to 3.4L using forged components.
- Increased compression, including:
- cylinder/piston upgrades
- valve seat angle changes
- valve spring material/retainer updates
- Independent throttle body system with six trumpets.
- Independent butterflies + independent injectors, fully:
- computer-controlled
- programmable (mapping/tuning mentioned)
- Output: “300 horsepower plus”, compared to the original engine’s ~230 hp.
Semi-active suspension
- Uses a semi-active suspension system.
- Includes a G-force monitor in the center of the car.
- Monitors roll/pitch/squat to transform drivability.
Weight reduction + brakes
- Removes approximately 150–200 kg to improve braking and performance.
- Billet aluminum brake calipers, six-pot design (vs older two-part calipers).
Bespoke exterior/interior materials and “gentleman” styling
- Car #100 brief:
- coupe
- based on late 3.2 Carrera G50
- Theme: a unique but classy “English gentleman’s car” for use in Tokyo.
- Paint: deep maroon
- appears darker/near-black in low light
- shows visible red/maroon tones when compared to a black car
- Interior:
- Harris tweed
- described as made on old looms by hand (“900 wide by hand”)
- emphasis on using original materials and British craftsmanship/standards
- Mentions extensive detail work such as:
- over 1,500 hours (with significant prep time beforehand)
- soundproofing under carpets
- bespoke door handles
- “engine bay cosmetics” to match exterior quality
Milestone context
- Rennsport established in 2012.
- By 2021, they are building their 100th car.
- Car #100 is positioned as the “favorite parts” culmination of their approach.
Pros (as stated / strongly implied)
- Higher performance while remaining road usable (comfort + style emphasized alongside power).
- Significant engineering upgrades:
- 3.4L conversion
- programmable independent throttle/injection system
- semi-active suspension with active sensing
- weight reduction
- improved brakes
- High-end bespoke materials and finish (e.g., Harris tweed; strong emphasis on “perfect” body finish).
- Identity preservation by keeping the original crank cases for engine/chassis identity.
- Strong craftsmanship and personalization:
- bespoke door handles
- soundproofing
- carefully considered details (seen and unseen)
- A concept aimed to cover both:
- traffic/commuting
- mountain-road fun
- “evening ball” gentleman-car usage
Cons (none explicitly stated)
- No explicit downsides are mentioned: no reliability concerns, maintenance-cost issues, or negative user experiences are described.
- The only indirect “con” is the build scale/time:
- ~1,500 hours but it’s not framed as a customer disadvantage.
User experience / usability claims
- Car #100 is intended as an everyday car:
- can sit in traffic
- then deliver performance on scenic roads
- Semi-active suspension with the central G-force monitor is described as:
- “completely transforms the drive.”
- Overall experience is framed as:
- better than factory
- with “hand built” perfection you can feel and see
Comparisons mentioned
- Race-car conversions vs this build: race-inspired inspiration, but tuned for road comfort/style and more usable enjoyment.
- Original output vs upgraded engine: ~230 hp stock vs 300+ hp after changes.
- Older brake hardware vs this setup: six-pot billet aluminum vs earlier two-part calipers.
- Production-era precision vs now: claims it may be better than it was when manufactured on the production line.
Overall verdict (concise recommendation)
A top-tier, bespoke Porsche 911 ST build: a road-capable, gentleman-class coupe with major power/suspension/brake upgrades and high craftsmanship. Recommended for enthusiasts who want perfection-level custom engineering and finish, not a budget restoration or off-the-shelf tuning.
Unique points mentioned (all)
- Rennsport converts early/mid-80s 911s with customer-specific briefs.
- Often uses late-80s donor cars and builds around the chosen donor.
- Inspiration comes from club racing cars (late 1970s–mid 1980s).
- Designed for road enjoyment rather than strict race conversion.
- Rennsport established in 2012; car #100 built by 2021.
- Technology added without changing the car’s essence/simplicity.
- “Lego-like” interchangeability between years (new engines into old bodies).
- Car #100 allocated to a Japanese buyer for use in Tokyo.
- Requirements include a coupe, based on late 3.2 Carrera G50.
- Design direction: classy English gentleman.
- Restraint and elegance: solid colors; deep maroon selection.
- Maroon paint effect depends on lighting (can look black indoors).
- Interior uses Harris tweed, hand-made on old looms.
- The painted body shell is described as “new life of a car.”
- Target use: traffic comfort + performance on mountain roads.
- Build time: ~1,500 hours, with substantial prep before assembly.
- Donor car: 1987 3.2 Carrera G50 with torsion bars.
- Keep original crank cases to retain identity (engine number matches chassis).
- Rebuild from scratch; upgrade to 3.4L with forged components.
- Higher compression plus valve seat and valve spring/retainer changes.
- Independent throttle body system with six trumpets.
- Independent butterflies/injectors; fully computer-controlled and programmable/mappable.
- Output: 300+ hp vs original ~230 hp.
- Cosmetic engine bay work to match exterior quality.
- Semi-active suspension with G-force monitor (roll/pitch/squat).
- Suspension sensing described as transforming the drive.
- Weight reduction: 150–200 kg removed.
- Brakes: billet aluminum six-pot calipers vs older two-part calipers.
- Mix of race/rally-derived tech applied to a road car.
- Build process emphasizes craftsmanship at multiple levels.
- Personalization happens after mechanical fit; personalization targets what the client sees.
- Car #100 is described as the best culmination of previous builds.
- Emphasis that no detail is by chance (soundproofing, bespoke door handles).
- “Gentleman’s car” framing: evening ball + fun driving.
- Desire-driven buying: customers want perfection and can see/feel it.
- Anticipation to see it driven in Tokyo’s mountain roads.
Speakers / viewpoints (consolidated)
- Rennsport founder / lead speaker: explains the customer-driven model, philosophy (race inspiration + road refinement), and engineering approach (including identity retention and performance goals).
- Team designer / engineering contributor (family involvement): discusses design direction (“restrained elegance”), deep maroon selection, family collaboration, and materials (Harris tweed).
- Overall presenter / another voice: emphasizes craftsmanship outcomes, “perfection” experience, and intended use as a gentleman car that’s also everyday-capable.