LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Loosing power at higher speeds.

Old 08-14-2008, 01:18 AM
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Join Date: Oct 2006
Location: Post Falls, Idaho
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Loosing power at higher speeds.

My 0-50 time is 4 seconds. My 0-85 is 10 seconds but then I only gain 3 to 4 mph per second after I reach 85 mph. I was thinking it was a higher rpm issue but checking 1st gear and 2nd gear on the datalog I am going all the way to 6000 rpm's with no problems and then once its shifts to 3rd it looses power. What would cause a drop in power with higher speeds? I have spark retard right around 85 mph and this is obiviously causing a power decrease but what is making it happen? Im looking for something I can check or might need to be replaced. There has been nothing done to the car but add the mods below and it now has 109,000 miles.
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