TAT Pro System Info

We have just developed a New System which can turn nearly any roller-set into a very accurate and consistent Acceleration Chassis Dynamometer.  Such a dynamometer is often also called an ” Inertia Dynamometer “.

newspekt.gif (1068 Byte)  “One System for all Chassis Dynamometers”

Important for an accurate test is that the roller set has sufficient dynamic resistance. 

This is, for example, the case for the Maha Snap-On ASM which is marketed through Snap On / Sun Electric, BOSCH FLA 202/203/206 and the Bosch LPS-002.

The dynamic resistance or inertia of a roller set can be determined experimentally:  just take a car onto your rollers and spin up the rollers to say 20 mph in a low gear, then change to a high gear (we suggest one gear down from top gear as not to exceed the safe operating speed of your roller’s bearings).  After the gear change, your engine will of course drop to a low rpm which is what we want.  Now accelerate full throttle up to the maximum engine speed right to the cut-off of your engine.  How many seconds does this take ?  Let us know the answer to this and what car you were using and we can give you an idea of how well your roller set can perform as an inertia dynamometer.

A lot of our testing for our system was conducted on a Bosch  LPS002 chassis dynamometer  (roller diameter 230mm, approx. 9 inches) and a Bosch FLA 203 (roller diameter 318mm = approx. 12.5 inches).

The TAT  Data Acquisition System offers the following features:

(1) Correction of Power and Torque with any desired correction factor (SAE, old or new, DIN, EWG, or own correction factor)

(2) Power and Torque curves can be viewed and printed vs. Roller Speed in mph or km/h as well as engine RPM

(3) All printouts are in full color and can come with comprehensive operator comments as well as time and date stamp making filing easy

(4) For engine mapping purposes there is a real-time display available showing all current values on the computer screen in the form of virtual on-screen instruments (see picture 4)

(5) Up to seven analog sensors can be attached and their readings displayed when in “real-time mode”

Features of the TAT Pro System

  • all data is stored on a PC
  • all data can be made available via networking
  •  all sensor values are displayed in real-time during a dyno run
  •   Graphs of Power and Torque
  •  Power and Torque corrected to SAE, EWG (EEC), DIN, etc.
  •  all data can be viewed on screen in the form of curves or in tabular format
  •  graph print-outs in full colour of graphs and data table
  • ample space for comments for each individual dyno run
  • overlaying of all curves out of multiple tests possible
  • acquisition of Power at the wheels and the Power losses in the drive train during coast-down
  • calculation of true corrected Flywheel Power, even for older systems  (see picture 5) as the sum of the corrected power at the wheels and the power losses in the drive train
  •  connection of nearly any sensor or instrument possible: e.g. pressures: boost pressure, exhaust back-pressure, oil pressure, temperatures: exhaust gas temperatures, inlet air temperatures, oil and water temp., other temperatures, air / fuel ratio, turbo speed, fuel flow, air flow, etc. – many more possibilities exist.
  • calculation of complex data derived from input data, such as BSFC, BSAC, piston speed, or even air / fuel ratio directly as a function of the voltage of the vehicle’s O² probe
  • live engine data from the engine management system can be acquired when using suitable interface electronics


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