I got my GTO up to 163 again the other night going across the bay after work. A buddy of mine from work has a '99 Trans Am and wanted me to take him on a run like the video I posted on youtube. This was the first time I've limited it out since I put the Borla cat-back exhaust on. With a little more HP and torque, I figured it would go faster then the 163 I've done UMPTEEN times, but no such luck.
I was guessing before that it has some sort of electronic limiter/governor on it that my Diablosport Predator tuner can't fully shut off. I asked my Lingenfelter Vette buddy at work and he said if my car's going faster then 155 then it has no limiter/governor on it and that it is wind drag that is holding me back. I argued with him and said I've done my top speed runs with only myself, 1 passenger, and 2 passengers in the car with varying wind conditions and varying levels of gas in the tank. So if one day, say my car only hit 161, and then another day say 159, and another day 163, and another day 163, so on and so forth, I'd agree with him. But 163 every freaking time, and I've done it 9 or 10 times now? What do you guys think?
I'm putting my Kooks stepped 1 3/4" to 1 7/8" Signature Series long tube headers on tomorrow and gonna do another run sometime this weekend late at night and will know for sure something's holding me up if it can't break 163 then.....at least that's my hypothesis. Still waiting on the $ for a torque converter and transmission cooler before I put my CNC ported LS3 heads with hollow valve stems and custom ground Comp cam on (not to mention the 2000 dollar install and dyno tune fee...yikes...). There's a guy 2 towns over with identical setup with the exception of a different brand cat-back exhaust and his dyno sheet showed 440 RWHP. I'd hope to hell a car with that power could go faster then 163...
p.s. here's a link to the youtube video if you haven't already seen it.
