{tag:53} 1991 BMW 8-Series 850i
BMW 8-Series
Twin Turbocharged

Dinan 8 Twin Turbo V12 | 1 of 50

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General Vehicle Information

Year: 1991
Manufacturer: BMW
Model: 8-Series
Trim: 850i
Exterior Color: Gletscherblau (280)
Interior Color: Silbergrau Hell Nappa (0353)
Current Mileage: 
174,900 Miles
Not Available
Owner: @JRW - Flemington, NJ, United States

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vehicle specifications


Motor: Twin Turbocharged 5.0L M70 V12
Boost: 10 PSI
Intercooling: Air-to-Air
Transmission: HP24 4-Speed Automatic
Drive Configuration: RWD

Performance Data

Horsepower: 525 HP
Torque: 589 ft-lbs TQ
* Power data was provided by the manufacturer.
Test Results
0-60 mph (s) 4.6
1/4 Mile Time (s) 12.8
Top Seed (mph) 190
* Performance data was provided by the manufacturer.

Vehicle or Project Description

This BMW 850i received Dinan's Stage II Twin Turbo system, Stage III Suspension system and Wheel/Tire package. It is 1 of 50 ever built and makes 525hp and 589 ft-lb torque. It was commissioned by PGA Pro Mark Calcavecchia at a cost of over $25,000.

Chassis CB73392 is a Glacier Blue 850iA originally owned by former PGA Pro Mark Calcavecchia. He commissioned the Dinan conversion which consisted of the Stage II twin-turbo package, Stage III performance suspension package and wheel and tire package at a cost of over $25,000 in the early 90’s. The car was later sold through a broker in South Carolina and shipped up to New Jersey where it has resided for the last 10+ years.

While it has racked up fewer than 1,000 miles in that time, it has been driven in excess of 135mph on Pocono6 Raceway (in the rain unfortunately) and featured in multiple events including the Greenwich Concours D’Elegance (Best in class), East Coast Concours, Bimmerfest East (1st in class), Import Nationals (2nd in class), Patroon Concours (1st in class), Scarsdale Concours and many other local shows and meets.

engine specification header

Engine Specs

The Dinan 8 is a twin turbo, dual inter-cooled system that continues to utilize the 850i’s twin engine management systems. The engine management system consists of high flow injectors, Dinan’s Turbotronics 5 (digital manifold pressure sensor) and new software to optimize fuel delivery and spark advance. It allows the stock 9.0 to 1 compression M70 V12 to run up to 10psi of boost.

The Stage II package adds a Dinan designed exhaust system to reduce back pressure, extrude honed intake manifolds and various drivetrain component including high stall torque converter and shift kit for cars equipped with automatic transmissions.

Twin turbochargers (10psi), dual air-to-air intercoolers and associated piping, valves and wiring
HP free flow exhaust system
Extrude honed intake manifolds w/ supplemental manifold gaskets
Engine electronics (Turbotronics 7 w/ top-speed delimiter)
Bored throttle bodies w/ larger mass air sensors
Strong-Strut tower brace

transmission and drivetrain specification header

Transmission & Drivetrain Specs

Transmission cooler
Transmission chip and shift kit
High stall torque converter
3.64:1 Limited slip differential (LSD)

Suspension Specifications

Transmission cooler
Transmission chip and shift kit
High stall torque converter
3.64:1 Limited slip differential (LSD)

Brake Specifications

Stage III Brakes:

345 x 32 mm (F) and 328 x 20 mm (R) floating rotors
BMW Motorsports 4-pot (F) and mono-pot (R) calipers

Exterior and Body Details

This BMW's exterior is finished in Glacier Blue (Gletscherblau - 280). Only 265 were sold with this color worldwide with only 67 of them coming to North America.

Dinan 8 rear badge

Coming Soon: CSi front and rear fascias along with euro CSi mirrors

Interior Details

This BMW's interior is finished off in two tone light silver / gray leather (Silbergrau Hell Nappa - 0353). A total of 3,960 8-series BMW's left the factory with this interior combination.

Safety Equipment

  • 3 Point Belts
  • Air Bag(s)

Stereo System & Electronics

This car came with an aftermarket stereo but has been returned to stock with an in-dash tape placer and trunk mounted 6-disk CD changer.

Wheel & Tire Specifications

Wheels: Powder Coated Dinan 3-Piece Performance Pkg
Front: 17" x 9.5"
Rear: 17" x 9.5"
Tires: Yokohama AVS Intermediate
Front: 275/40ZR17
Rear: 275/40ZR17

Build & Ownership Details

Coming Soon

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William Johnson
2 months ago

Wow, this grand tourer has the same amount of power as my 911! Beautiful car.

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