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Personal intro
Intro technics

Exhaust systems
Exhaust overview
XJ Saloon S1,2,3
XJ40 (AJ6&V12)/X300
TT exhaust explained

The Jaguar V12
V12 Performance
Stretching the V12
E-type EFI conversion
D Jetronic
Lucas EFI
Vacuum advance
Ignition systems
V12 throttle linkage
Article: V12 Engine
V12 Archives

The Jaguar AJ6
AJ6 Performance
3.6 Richness
AJ6 fault codes
AJ6 Archives

The Jaguar XK
XK Performance
Article: XK Engine
Article: 4.2 EFI

The Jaguar V8
V8 Performance

AJ6 Superchargers
Supercharging article

Suspension & Brakes
ECU repairs
Miscellaneous bits
Prices & ordering

Updated August 2016
Visitors: 25826280


Please note: New website at

This is the website of AJ6 Engineering, bringing an exceptionally high standard of technical expertise to the supply of Performance Parts, Electronic Control Units, our unique TT Tuned Exhaust Systems and associated items.

Revised edition for 2014!

Engine technology
for the modern world

A new book that bridges the gap between the enthusiastic layman and the expert. Full of explanations about how engine technology has evolved, especially in recent years, to deliver amazing levels of performance and economy, whilst reducing harmful exhaust emissions almost to zero. By Roger Bywater.

Full info here and reviews as well!

DFV 1967 to Toyota 2009 - a remarkable tale of progress

When Keith Duckworth's DFV engine burst onto the Grand Prix scene in 1967 it represented the cutting edge of racing engine technology as it was at that time, and all the current V8 engines in F1 owe something to the DFV in their design. What has changed in 42 years? Article by Roger Bywater.

Full article here!

Most of our products are of a bolt-on nature and are aimed at improving responsiveness and flexibility without destroying the essential refinement originally defined by the manufacturer. To put this another way - most people buy a car like a Jaguar because of its unique qualities so it is important not to turn such a car into a completely different animal. Improvement is the aim rather than radical change - although we can do that too if asked.

We produce induction systems, exhaust systems and we re-program electronic control units but we also supply appropriate suspension enhancements. We also offer similar products for racing with the emphasis shifted more towards top-end power rather than the mid-range torque that is more useful for a road car.

Test, repair and upgrading of fuel injection control units is another important part of our business and we also manufacture several products to help with fault diagnosis.

Uniquely available from this site is an unrivalled library of technical information including detailed histories of the Jaguar V12 and XK engines (published originally in Jaguar World magazine), and explanations of important topics such as modern supercharging and fuel injection systems. A comprehensive glossary is also included to explain some of the mysterious jargon of Electronic Fuel Injection, Exhaust Emissions and Engine Technology.

AJ6 Engineering, 60, Henshall Road, Bollington, Macclesfield, Cheshire SK10 5DN, England
Email, Tel/Fax:- 0044 (0)1625 573556