Wow!@

The RennTech Stage 1 Power Package ECU Upgrade is amazing. The idle speed is slightly higher now and where you could feel the engine running at idle, it is now totally smooth, which I believe is due to richer idle strategy. Tailpipe emissions are still almost non-existent.

Power was good before, but now the car reacts more like my 1970 Porsche 911S in that when the RPM come up to 2800-3000, the car comes on like it has been rear-ended by a cement truck - much stronger pull than before. Shift points also appear to be raised too, hitting right around 7,000-7,100 on the upshifts by the in-dash tachometer.

Fuel economy, during normal driving, appears unchanged...

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership