Tech Support
Install Info Users Guide

F A Q

Are these products LEGAL for competitive racing??

In most cases, our Tach-MateTM line of data acquisition systems ARE acceptable within the stated technical guidelines of racing bodies. Of course, this is always subject to the interpretation of the tech officials at each event.

One common dividing line is that data acquisition systems are allowed during practice sessions, and test-and-tune days, but not during actual competition. This is not considered to be a real limitation, because the proactive value of data acquisition systems is in setting up the race vehicle (and driver response) in advance of actual competition. If possible, it is always nice to record performance data from the main event as well, especially for use in fine-tuning the engine and suspension for the next event.

Some sanctioning bodies have prohibited ANY form of computer use at their tracks. The most obvious signal of computer usage is the DB9 connector necessary to connect your on-board system to your PC - like the one we use for our PC Upload Option. In such races, the standard, engine-RPM only model of Tach-MateTM would be allowed, since the data would be available only via the tachometer. Even this single channel of COMPLETE MEMORY can provide a great deal of valuable performance data.

Data acquisition systems are increasingly considered to be a necessary set of tools for optimal performance of both vehicle and driver. Additionally, by recording the actual performance during the race, the driver is free to pay full attention to the race traffic. This is a real safety feature!

The high RPM on my tell-tach is different than the high RPM recorded by Tach-MateTM - Why??

There are two possible causes of this observation, and either one or both may be true at any given time.

First, remember that Tach-MateTM is recording data at a rate of 30 times each second. Most analog tachs work at a maximum rate of 20 times per second, and most digital tachs can update their displays no more frequently than 10 times per second. This means that Tach-MateTM is recording MORE actual engine RPM than either tach - and the high RPM might be in one of the points that the tachs are skipping.

Second, it is quite common for tachometers to be slightly inaccurate. Analog tachs can read either high or low, and the mechanisms in the tach are the usual cause of the discrepancy. Digital tachs tend to read high, since their sensitivity to RF noise can cause them to interpret other electrical signals as engine pulses, thus increasing the perceived RPM.

To find out how accurate your tachometer is, use Tach-MateTM's built-in self-test function. In this mode, our computer signal sends out a 'pure' series of RPM numbers, incremented by 1000 at a time. If Tach-MateTM sends 2000 RPM but the tach reads only 1800 RPM, there is a 10% error at that point


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