Temperatures today were around 92 degF,  high enough to make some measurements of how the Turbo Concepts Stage 1 turbocharger performs with hot air temperature.

Compared to the last warm weather readings that were made when the air temperature was around 85 degF, the performance is a little more off, but not too badly.

The boost curves that were recorded to generate the chart above are shown below:

Adding this latest data to the compilation of K04 and K04 hybrid data that I have collected produces the chart below:

The data spread for the TC Stg1 turbo’s is wider than the other turbochargers due to the conditions that I have been able to measure them under, a range larger than any of the other K04 based products.

The results between products is unsurprising given the relative dimension of the turochargers that have been measured.

Some warmer temperatures made for an opportunity to record boost onset from the Turbo Concepts Stage 1 turbo’s to compare with readings made during a cooler time of the year.

Readings were made by going WOT from a number of different starting engine speeds.

Shown below is a compilation of all the data of this type that I have on the TC Stg1 turbo’s with the 85 degF data, which I recorded today, connected by a solid line.

The primary alternative product for the TC Stg1 turbo is the BorgWarner RS4 K04.  A comparison of the two turbochargers, at 85 degF, is shown below.

These results are consistent with other data previously recorded where the BW K04 has a slight advantage in boost response over the TC Stg1 turbo’s.