Build Services

The JEMS approach is to assess a car as a whole package. More horse power isn't necessarily the right way or the most cost effective way to gain extra seconds on the track.

‘I wish I new you first’ is a phrase often heard at JEMS. Understanding the clients requirements and the whole-package approach means a job is done properly and only needs doing once.

JEMS Health Check
Book your car in for the JEMS Health Check and you will receive a written report on what is required to make it the best possible package. The three main areas of any competition car are:

The report is yours to take away, but you can use JEMS experience in design, build and engineering to turn your car into a winning package.
Contact JEMS for cost and availability.

JEMS Mini Health Check
Specially for Track Day enthusiasts or Sprinters our Mini Health Check will make sure your car is safe and handles as well as it can. The Mini Health Check will include the cars tracking, cambers and corner weights.

 An engine on a dynamometer measuring power output

YB Engines
JEMS specialize in YB engines and produce naturally aspirated versions making anything up to 332bhp, with a blown YB, revving to over 10,000rpm producing more than 1000bhp!
Drag Racing Escort Cosworth
YB Example Specification



The same principles apply to all engine builds and JEMS have worked on all types including:
Audi, BMW, GM, Ford, Nissan, Toyota, Mitsubishi

700+bhp Toyota Celica ENGINES
Engines are built in-house, everything from a 1300 Crossflow up to big horsepower turbo units. Although the basic principles can be applied to any engine build, JEMS prefer to find out exactly what their customer requires and plan the right package for their needs. Flow benches are used to test and refine the flow through the cyclinderhead - better flow equates to more power. Dynos are used to measure the power output and get the package right, everything is built with meticulous attention to detail.

Building engines is not just about power and JEMS engines are built to suit the engine characteristics to the driver’s needs and driving style. This includes looking at the car as a whole.

 An engine being prepared in the immaculate engine room

Checking the fit of a custom made suspension pick-up point on a Ford Fiesta.
DESIGN & BUILD
Good suspension, water system and fuel system design are the basis of any good competition car. These with engine and drive-train installation, fabrication and set-up are skills were learnt by Jon Edwards through 11 years of competing (Vecta Ford Championship) and his time building TVR’s race cars and their engines from scratch. Years of experience have been gained from listening to driver feedback and translating this into race winning cars. Jon has also worked with Australian touring cars and European GT cars with their focus on endurance as well as speed.

Custom brake system designed for a Track Day Toyota MR2. This car is capable of nearly 200mph.

A race car with a very low centre of gravity and geometry setup for coping with bigs levels of grip requires bespoke parts. Crossmembers, track control arms, steering arms, compression struts, link boxes, turret boxes, anti-roll bars etc. are all built from scratch for the car it is going on. The difference can be felt in a cars poise, neutral handling, grip and a feeling of safety.

 Careful measurement for custom suspension build