At 3D Motorsport we have in house a Sun Ram 12 chassis dynamometer. This is a very versatile system that uses an air cooled eddy current retarder capable of resisting 300hp... Nm of torque.
A rolling road is a very measurable and scientific way of balancing an engine's three main requirements of air, fuel and ignition timing to their optimum under a fair test environment.
We use two 4 gas analysers monitoring CO, Co2, HC's, Lambda and the air fuel ratios, and other plug in systems specific to individual manufacturers.
It has a circular air system blowing cool air at the front of the car (with adjustable flow rates to acurately simulate different road speeds) and two extractors from the rear, one for exhaust gases and the second sucking air through from the front to prevent buffeting and heat soak.
Vehicles and applications
Any race, rally or road car, any fuel, fornt or rear wheel drive, with or without an LSD. We can adapt a set up for single seaters and some 4x4's either if they have selectable 2/4 wheel drive or a locking centre diff. However, although we can develop the engine tuning, we would be unlikely to be able to produce transmission drag values for these 4x4's.
Many road cars are massed produced to last for twenty years with economy and environmental issues as priority. So even on standard road engines there is a lot of tolerance that can be used when the focus is on performance. Especially with the additions of the list at the top of this page.
Any mechanical upgrades that are to be carried out must be done first so that the ignition system and fuelling can be set to match.