HSRK results

HSRK Results

I have been running the Vector HSRK (Heat Soak Reduction Kit) for few months. I have been a big fan of the HSRK because the theory makes sense. You relocate the IAT sensor from the hot MAF housing to a spot where it doesn't get soaked. This gives the sensor the ability to read "real" air temperatures and not other components that it really shouldn't be reading. Not to mention Vector touts their special sensor to react 10x faster than stock.

Sounds great to me because we all want our air temps back to normal when we romp the throttle (if not sooner). So faster is better.

The Test

This test was done three different ways to prove accuracy. Actually the last two were done trying to disprove the first "hi-tech" method. The first method involved using HPtuners enhanced I/O ports to record the IAT sensor analog signals. The second and third method was done using the KISS (keep it simple stupid) approach which involved wiring a momentary switch in the interior so I could switch the IAT sensors back and forth between stock and Vector.

Vector IAT Results
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First Test (method 1) Using HPtuners "enhanced I/O" I logged the sensors output voltage (in PPM to get better resolution) and did not worry about actual temps.

Adding the conversion to the equation would just add a potential for error. Besides the main purpose of this test one was to see how the "10x faster" sensor reacted in the presence of changing air flow compared to the stock sensor. You will notice the results video at left shows a label for SIAT and VIAT. This indicates Stock IAT and Vector IAT.

Keep in mind at this point I am not worrying about actual temps but just how the two sensors compare.

The first thing I noticed was the Vector IAT (magenta color) read colder than the stock unit. Since I was reading analog voltages and there is no conversion involved I cant tell how much colder. More on that later.

I guess I expected higher temps sitting at the shop with the stock unit because of "soak" in the stock IAT housing right? It will go away with a high speed cruise and the temps equalize right? Wrong, the Vector IAT ran considerably cooler than stock everywhere it was tested.

HPtuners logging included RPM, MPH, throttle position, air flow and the outputs from both sensors. Once again "SIAT" is the stock sensor and "VIAT" is the Vector relocated sensor. This was tested when the SS was at normal operating temperatures (from a stop and at highway speeds). To make it worse, there were no apparent improvement in response time (Vectors 10x faster claim).

Note: To eliminate the possibility of component error and tolerances I changed out the harness and channels including the 10k drop resistors used in the circuit. The results where the same. The Vector read cooler on the other channel as well.

If you have HPtuners and want to see the scan file, drop me an email and I will send you the scan log and my config file.


Second Test (method 2) Was logged from results manually taken using a switch to toggle the stock IAT and Vector IAT back and forth. 28 samplings were taken starting with a truck with a heat soaked intake and driving 2 miles in the city and 8 miles at highway speeds.

The Vector IAT sensor was anywhere from 5-13 degrees cooler than the stock unit. The average variation was 6.82 degrees cooler than stock Click "second test" on the left to see the manual logged results.

Third Test (method 3) Was taken at highway speeds using the DashHawk while cycling the IAT sensors back and forth on 5 second intervals. Once again the results were 5 to 7 degrees colder on average with the Vector IAT sensor compared to the stock unit.

One of the things that I noticed while manually switching back and forth was that the stock IAT fluctuated with changing speeds much more than the Vector IAT. Something I did not expect since the Stock unit is supposed to be heat soaked and sluggish. This test did not back up any of Vectors claims for a faster IAT.

So in summary I am going to go back to the stock IAT for a couple reasons. First I am concerned about the variation in temperatures and I also have had problems with Vectors harness. The key/latch on their custom connector is not correct for the piece it mates to. I have had MAF and IAT issues on three occasions now which have been related to connections in the HSRK harness.

Keep in mind this is just one truck and one IAT sensor from Vector. Your results may vary but I am confident the Vector HSRK was a waste of $100 for me.