Business Details
48 Years
experience
Trusted Car Restoration & Performance Specialists in Aylesbury
Established in 1978, J J Performance has built a reputation as a leader in automotive restoration, performance engineering, and technical innovation. Our expertise spans over four decades, rooted in John's early career as an RAF aircraft technician, which honed precision engineering skills later applied to motorsport. We specialise in restoring modern classics and vintage vehicles while delivering race-winning performance upgrades for track and rally applications. Our technical capabilities extend to hydrogen engine cleaning technology, combining environmental responsibility with enhanced performance.With a heritage of building championship-winning race cars, including the groundbreaking Alfa 147 Super 1600 Rally Car, we maintain rigorous quality standards using OE-approved parts and advanced diagnostic equipment. Our team's extensive experience in the 750 Motor Club Clio 182 Championship demonstrates our ongoing commitment to motorsport excellence. As a family-run business, we prioritise transparent communication, technical integrity, and customer satisfaction across all servicing, repair, and restoration projects.
Services
Servicing
Repairs
Race Preparation
Restorations
Hydrogen Cleaning
Details
- Year established: 1978
Highlights and features
- 40 years of motorsport engineering expertise
- Former RAF aircraft technician technical background
- Championship-winning race car development experience
- Pioneers in chemical-free hydrogen engine cleaning
- Use of OE-approved parts for all servicing
Services
Servicing
Comprehensive servicing for all vehicle types using OE-approved parts to maintain manufacturer warranties. Our technicians combine traditional engineering skills with modern diagnostic equipment for petrol and diesel engines. Regular servicing intervals ensure optimal performance while preserving vehicle longevity through meticulous attention to mechanical components.
Race Preparation
Specialist race car development with proven championship-winning expertise. We implement performance upgrades including engine modifications, suspension tuning, and aerodynamic enhancements. Our motorsport heritage informs every build, from historic rally cars to contemporary track machines, ensuring competitive reliability and performance gains through precision engineering.
Restorations
Full and partial restorations for modern classics and vintage vehicles combining technical precision with historical accuracy. Our team preserves original character while incorporating performance improvements where appropriate. From bodywork to mechanical systems, each restoration meets exacting standards for both road and show use.
Hydrogen Cleaning
Chemical-free hydrogen-based engine cleaning system that removes carbon deposits without disassembly. This environmentally friendly process improves combustion efficiency, reduces emissions, and restores engine performance. The treatment benefits both modern and classic engines by enhancing fuel economy and extending component lifespan through thorough internal cleaning.
Repairs
Comprehensive repair services covering braking systems, suspension components, and engine diagnostics. We utilise advanced laser alignment technology alongside traditional engineering methods. Our repair solutions address both routine maintenance and complex mechanical issues, supported by hydrogen cleaning technology for improved system longevity and performance outcomes.
People
John
Owner
With 40 years of motorsport engineering experience, John established J J Performance after serving as an RAF aircraft technician. His expertise spans race car development, classic restoration, and innovative engine technology, having built championship-winning vehicles for major rally competitions while maintaining technical excellence in all projects.
Questions
What types of vehicles do you work on?
We specialise in modern classic and vintage cars, including race and rally vehicles, with expertise in Lancia Delta Integrale, Alfa Romeo, and Clio 182 models.
Do you offer MOT testing services?
Yes, we provide full and interim servicing including MOT testing for all petrol and diesel vehicles using OE-approved parts.
What is hydrogen engine cleaning?
Our chemical-free hydrogen cleaning process removes carbon deposits from engines, improving performance and efficiency while reducing emissions without disassembly.
Can you restore classic cars?
We offer complete and partial restorations for modern classics and vintage vehicles, preserving original character while incorporating performance enhancements where appropriate.
Do you support motorsport teams?
Yes, we actively support the Clio 182 Championship with race preparation services and have built championship-winning rally cars for major competitions.
What are your opening hours?
We are open Monday to Friday from 8:00am to 5:30pm for all servicing, repair, and consultation requirements.
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Reviews (4)
Emily Louise Blake
Apr 15, 2020
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What a friendly helpful garage. They fitted me in immediately as needed my car fixed for working at the hospital, will definitely use them in the future!
Julien FitzGerald
Nov 23, 2019
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Wouldn't go anywhere else to get my car serviced and cared for. John and his team are always professional and highly skilled. They can practically take a 20 year old car and make it run like new.
5*
5*
Jakob James Sharman
Feb 22, 2018
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JJ did a Hydrogen engine clean on my van. I instantly noticed more power but more importantly my MPG rocketed up by around 15-20%. Excellent value for money and with the amount of fuel I’m saving it paid for itself in just a few weeks. I would definitely recommend this, great allround service by JJ.
Adrian Thompson
Jul 09, 2016
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J J Performance have carried out work on 2 of my cars on a number of occasions. Some of the work has been on an old Italian car, prone to being a bit difficult! I've always been very happy with the result and the bill! I would not hesitate to recommend them. A friendly, trustworthy and helpful garage which in my opinion is rare these days.
