Summary

00:00 - Jeff Aldrich has asked, is it possible to do steady state tuning on the road? My tuner tuned my entire car while doing runs on the road, he said he was tuning it throughout the entire curve.
00:13 My car is a supercharged 2002 LS1 Corvette.
00:18 OK yeah it is absolutely possible to do steady state tuning on the road.
00:22 This is a technique that is taught in the road tuning additions in both of our practical tuning courses.
00:28 So the technique that I use is called left foot braking and as its name implies, we're using our left foot to apply a little bit of load to the brakes and this we can use to control the engine RPM so basically by adjusting the pressure of our left foot on the brake, we can apply more or less load and we can then adjust our throttle position as well and stay at the same engine speed.
00:53 Now this is a technique that does take a little bit of time to develop, particularly when you first get started, you're not going to have the finesse required to make really fine subtle adjustments to the brake pressure.
01:05 We also do need to be careful because obviously when we're using the brakes like this, we can end up putting a lot of heat into them so it is a process we need to use carefully and take our time doing it.
01:16 Now if you're reflashing a factory ECU which I'm going to guess with a 2002 LS1, it's probably what your tuner was doing.
01:25 Often the steady state tuning is a little bit less critical.
01:28 As I've mentioned in an earlier question, we're already starting from a pretty good base tune with the factory calibration and most factory ECUs also run on a mass airflow sensor system so as long as that's calibrated properly, that mass airflow sensor is actually making the ECU's job really easy because as we're cruising around, it's telling the ECU exactly what mass of air is entering the engine.
01:53 The ECU also knows what size injectors are fitted to it so it then knows really accurately exactly what pulse width to supply to those injectors to achieve our desired target air/fuel ratio.
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