Collector signal
930 3.3 Turbos have an established collector auction market
Vehicle facts
Built
—
Research in progress
Powertrain
B6
Technical profile in progress
Output
300 PS / 221 kW
Existing catalog value
Verified market value
CHF 139'021
pending
About this car
SCI Collector Score, the collector case, essentials, market & analysis.
SCI Collector Score
SCI-1.5.058/100
Cautious · Cautious
SCI scale
Tap a color to explore the scale.
6/10
Current · 6/10 · Balanced zone
58
Evidence Confidence
65%
Coverage
Indicative SCIRisk —
SCI 1.5
Collector score.
75%
Collector core
25%
Market
Factor breakdown
Open any factor to see what it means and which evidence supports it.
How SCI works
Collector quality and evidence are separate. Structural collector factors carry 75%; observable market factors carry 25%.
Methodology & score historyResearch notes
Publication gates
• No coherent sold-price benchmark is available.
• Needs at least 5 comparable sold observations inside the 36-month market window.
• Needs at least two independent source providers in the benchmark window.
• Needs at least two comparable sales in the last 24 months.
• Data Confidence must reach at least 68/100.
Rationale
• Collector Evidence G contributes source-backed structural evidence from 3 independent sources; it does not substitute for transaction evidence.
• SCI 1.5 separates structural collectibility from evidence confidence: scarcity, collector significance and future relevance carry 75% of SCI; observable market factors carry 25%. Thin public-market evidence primarily reduces Confidence rather than intrinsic collector quality.
• Uncovered factors retain conservative neutral priors in the score model while their missing support remains visible in factor coverage and Evidence Confidence; they are never presented as equally evidenced facts.
• SCI is indicative: the collector score clears the coverage gate, while Verified publication still requires the independent market-evidence gates.
Collector intelligence
Why it matters.
The collector case in a few signals first. Full editorial notes and source detail remain available below.
Significance
originality, matching drivetrain, mileage and especially the 1989 G50 configuration are repeatedly highlighted by RM Sotheby's.
Engineering
No manufacturer-confirmed 3.3-litre phase total was located in the reviewed Porsche sources
Rarity
no production count is asserted.
Key checksHigh: matching-number drivetrain, original paint/interior, factory documents, mileage and exact market/year…Do not mix 3.0 and 3.3 cars or early four-speed and 1989 G50 examples. Restoration quality, non-original…
Technical profile
The essentials.
Engine architecture
B6
Power
300 PS / 221 kW
Cylinders
6
View all specifications
Engine architectureB6
Cylinders6
Power300 PS / 221 kW
Kerb weight1,335 kg
Market
What the market tells us.
A quick read of the strongest published price evidence. Original source currencies stay preserved.
Verified market value
CHF 139'021
pending
Launch MSRP
DEM 74'000
Germany · 1978
Market confidence
58/100
Low
Evidence activity
3 sold
1 asking · 1 source
Market chart & benchmark
Price history, evidence modes, ranges and benchmark methodology · open by default
OpenClose
Market chart & benchmark
Price history, evidence modes, ranges and benchmark methodology · open by default
Collectible market terminal
Market benchmark researching
Porsche 911 930 Turbo 3.3 · model-level research benchmark, not an appraisal of a specific chassis.
Completed sales · 3 · chart-readyAsking market · 1
Raw sales + adaptive trend · historical FX display layer · SCI benchmark gates remain unchanged
3 Sales1 Ask0 GuidesFX normalized
Observed sold-price evidence. Original source currencies remain preserved.
3 trend-eligible sales · 3 historical-FX pointsMove across a sale point to inspect the observation
SaleAskMedian trendLaunch MSRP
Raw sales remain individual evidence points. The filled line is an adaptive median market story visually anchored to launch MSRP on MAX; launch is not included in the median, SCI score or benchmark eligibility.
SCI Research Tools
Analyze this car.
Choose the decision you want to make. The full calculator appears only after you select a tool.
Vehicle gallery
See more of this car.
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List this car.
Turn the SCC record into a research-backed listing for the next collector.
Market intelligence
At a glance.
How to read this
Only qualified SCC evidence is shown. Missing evidence stays blank.
1
Active asks
0
New · 30D
0d
Median duration
3
Verified sales
Price distribution · USD
Asks, guides & verified sales.
4 observations
AsksSales
SCC $168,930
$66,666$168,930
Value since MSRP
Launch · 1978
DEM 74,000
Current research
$168,930
Qualified change
—
SCI factor profile
Score & evidence.
SCI 58
65.0%
coverage
58
Confidence
1
Comparable sales
Scarcity50 · pending
Collector significance67 · covered
Future relevance64 · covered
Historical performance50 · pending
Demand & momentum49 · pending
Liquidity52 · covered
Price resilience55 · covered
Supply dynamics45 · covered
Methodology details
SCI and evidence confidence remain separate measures. Missing evidence is never presented as equal precision.
Market signals
Market Radar.
Evidence currently in scope
3 qualified completed sales · 0 qualified active asks · 1 source families · FX-normalized to USD
0/4 published
Mileage impact
Mileage & value.
Reference sale value
$121,000
3 qualified sales with exact mileage
Reference mileage
86,905 km
Exact sale evidence
Curve status
Research
More comparable sales needed
SourceMileageValueDate
Bring a Trailersale94,000 mi$66,6662016-08-22Bring a Trailersale53,396 mi$121,0002018-06-05Bring a Trailersale54,000 mi$168,9302026-05-19AutoScout24 Switzerlandask90,400 kmCHF 135,0002026-08-27Upper-bound mileage stays qualified; asking values do not enter the sale-based curve.
Global Registry
Publicly observed.
Source-backed historical observations, deduplicated into known identities where evidence is strong enough. This is provenance research, not live tracking.
1
Publicly observed
2
Public observations
May 2026
Latest evidence
—
Research coverage
Research coverage
—
observed
Public source geography
One map · filter registry, sightings and listings
Country-level market source links; availability may change · historical evidence, not live tracking
Historical evidence · not live
Loading evidence map
Listing sources
Switzerland · 1 source
Marketplace links and observed offers. Search result pages are country discovery sources, not a verified count of available cars.
- AutoScout24 Switzerland2026-08-27
listing countryno evidence in layer
Natural Earth basemap.Research depth
Sources & methodology.
Professional research stays complete, but it no longer competes with the first-read vehicle story.
Price evidence ledger
MSRP, sold, asking and guide evidence with original currencies
Price evidence ledger
MSRP, sold, asking and guide evidence with original currencies
Price evidence
Evidence ledger.
Launch MSRP, realized sales, public asking inventory, valuation guides and reported one-off commission estimates stay separate. Auction venue, mileage, model year and specification context are exposed where sources publish them. Source currencies are preserved and estimates are never relabelled as MSRP, transactions or current market value.
Manufacturer / launch MSRP
Original published launch pricing. Net/gross basis is preserved where the source states it.
Completed sales
Published realized transactions only. Auction, venue, mileage and specification context remain visible; unsold bids never enter this group.
2026-05-19
Bring a Trailer
1988 · United States · 54,000 mi · Bring a Trailer · Online Auction · AUCTION SOLD · HAMMER
US$ 168'930 ≈ CHF 139'021
2018-06-05
Bring a Trailer
1988 · United States · 53,396 mi · Bring a Trailer · Online Auction · AUCTION SOLD · HAMMER
US$ 121'000 ≈ CHF 99'577
2016-08-22
Bring a Trailer
1987 · United States · 94,000 mi · Bring a Trailer · Online Auction · AUCTION SOLD · HAMMER
US$ 66'666 ≈ CHF 54'863
Current asking inventory
Public dealer and marketplace asking evidence as last verified. An asking price is inventory evidence, not a completed transaction.
Collector research notes
Full narrative, value drivers and risk factors
Collector research notes
Full narrative, value drivers and risk factors
930 3.3 Turbos have an established collector auction market; originality, matching drivetrain, mileage and especially the 1989 G50 configuration are repeatedly highlighted by RM Sotheby's.
Potential value drivers
- • No manufacturer-confirmed 3.3-litre phase total was located in the reviewed Porsche sources
- • no production count is asserted.
- • Long-running series-production second phase of the 930 Turbo, not a documented fixed-number limited edition.
- • The 930 Turbo remained Porsche's top-of-range 911
- • the 3.3-litre/intercooled evolution strengthened its role as the marque's benchmark road supercar.
- • Displacement increased to 3.3 litres and an intercooler was added, raising performance to roughly 300 PS in Porsche's period-generation history.
- • Long-lived second 930 Turbo evolution that cemented the Turbo as Porsche's flagship 911 identity through the 1980s.
Risk factors
- • High: matching-number drivetrain, original paint/interior, factory documents, mileage and exact market/year specification are major catalogue differentiators.
- • Do not mix 3.0 and 3.3 cars or early four-speed and 1989 G50 examples. Restoration quality, non-original engine/gearbox, mileage uncertainty and period/non-period modifications materially impair comparability.
Research status & production source
Verification, research tier, methodology and factory source
Research status & production source
Verification, research tier, methodology and factory source
Research status
Static profile
Editorial review in progress
Production facts
Verification pending
SCI methodology
Research · confidence 58/100
Research tier: P1 · Core research
Last static verification: 2026-08-31T00:00:00+00:00
Production source
Researching
Exact production research remains open.
Continue research
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