Andy has it right. You need to check the compression and go from there. He's also right about being fooled by who you run with. However, a good ITB will run a 7 pretty even down the straights, with the 7 only having an advantage near the end of the straight.
With all that said, if all you're seeing is 105 at Road Atlanta, you are almost certainly down on power. I'm hitting almost 120 at the turn 10 brake marker. However, that includes about a 6-7 mph boost on the last downhill part of the straight - if you stop looking at the top of the hill, you'll think you are slower.
Tom Lyttle
Decatur, GA
IT7 Mazda - 2006, 2008 SARRC Champion
ITS Nissan 200SX - finally running correctly
FP Ford Capri - waiting for a comp adjustment
GT3 Dodge Daytona - what was I thinking?
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