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Wheel spin was minimal. Application required calibration several times before and after updates.
In comparison, PCMSCAN performance options has a drag strip time slip option that incredibly accurate. This info comes from an OBDII connection and can be reloaded for observation or saved for later comparisons.
Datamaster TTS has a dyno option. It's not so user friendly though. I was never able to get the function to work correctly.
My roomate got this app for his phone the same time I got my elcamino. Took a trip down to the scales and looked up some info off the internet and it was actually really close (10HP). What do you guys know about a blistering 21 sec quarter mile and a 0-60 in the 19s. You dont know real speed until you sit behind a TBI 4.3l in an automatic G body car.
Ps. It doesn't make you look too good when you expect a 9 dollar program on what is essentially a nerdy kids toy to give you super accurate results. So chill.