205 HP Turbo Charged EFI Triumph TR-6

Price: - Item location: Littleton, Colorado, United States
  • Condition: Used
  • Make: Triumph
  • Model: TR-6
  • Type: Convertible
  • Year: 1974
  • Mileage: 25,100
  • VIN: CF12681 U
  • Color: Blue
  • Engine size: 6 Cylinder
  • Number of cylinders: 6
  • Fuel: Gasoline
  • Transmission: Manual
  • Drive type: RWD
  • Interior color: Black
  • Drive side: Left-hand drive
  • Options: Convertible
  • Vehicle Title: Clear
  • Want to buy? Contact seller!

1974 Triumph TR-6

205 HP Turbo Charged EFI Triumph TR-6

You are bidding a 1974 Triumph TR-6 that I have owned since 1985. The vehicle is turbocharged with a Garnett T03/T04 turbo charger and equipped with a 18” Spearco intercooler

The vehicle has hit 205 HP at 10 pounds of boost using premium gas at 5000 feet of elevation as measured by a G-tech performance meter. Sea level atmospheric pressure is approximately 20 percent higher so there should be a commensurate increase in horse power.

A leak down test was performed last month after the engine had been sitting for 6 months – there was zero leak down in all cylinders (photos).

The fuel mixture ratio and spark advance is controlled by a Megasquirt V2.2 computer controller with a wide band oxygen sensor feedback. By using a laptop the Megasquirt engine parameters can be modified while you drive. For example; if you think the cold start idle is too low it can be changed with a click of a mouse. The included image shows the volumetric efficiency of the engine for various RPM and manifold settings – changeable with a click of a mouse.

The engine has approximately 25100 miles on a 1999 rebuild. Since everyone asks: the 12 inch long cylinder on top of the driver’s side wheel well is a Canton Racing Accusump – a pressurized pre-oiler and surge oil supply. Turn the key and the oil system is instantly pressurized.

The car has a Revington TR aftermarket fiberglass surrey top. The seats were replaced with those from a Subaru GL 10; originals are torn but can be recovered.

The car is equipped with a 1983 Toyota Celica 5 speed transmission with Herman van den Aker conversion kit. The differential ratio is 3.45 (obtained from a TVR) which is lower than the stock 3.71 - don't worry; the turbo more than makes up for the lower rear end (a spare 3.71 differential is available at an additional charge).

Suspension upgrades include 16X7 inch Panasport wheels with 205-55/16 General UHP tires. Goodparts front and rear sway bars and nylatron suspension bushings. Corvair rear axles with 3 inch studs from David Wingett and aluminum front hubs with 3 inch studs from Southwich Machine & Design. The front shock absorbers are Spax and the rear absorbers are KYB gas shocks riding on a Herman van den Aker shock conversion kit.

The braking system includes a set of Toyota vented front rotors and a set of 7/8 inch rear cylinders with Datsun 280Z finned brake drums.

The vehicle was appraised for $15,000 in 2002.

Included with the vehicle are 2 spare Megasquirt computers, a RS232 to USB cable, all vehicle computer data files, quart cans of touchup paint, a spare fuel pump, spare EDIS components, component documentation and the original seats which need recovering.

Most significant flaws are: a small crack in the windshield, 2 small dimples in the hood and a section of the carpet on the rear deck where a trouble light got too close and melted a couple areas. Photos are provided for all of these flaws so you can evaluate how important these issues are to you.

I have had a web site for my car since 2000 which documents most of the modifications (web page source code available on request).

An overview of the vehicle can be found at the following web site:


Details of the engine modifications can be found at the following web site:


The main web page can be found at the following web site:


Don’t be afraid to ask any questions!

Thanks for looking and happy bidding.