TEXAS HEAT
Well-Known Member
Here's a VD plot of two E30 runs done on different days for comparison purposes. The only hardware difference is the addition of the Gibson exhaust (Red) and the stock exhaust (Blue). Other notable mentions should also point out that there was a difference of 8 degrees in ambient temps and CAT's were about 10-12 degrees difference in favor of the Gibson exhaust. Pk-pk gains only show about a 7hp difference between the two, however there are curve gains as high as 18. Now, it would be naïve of me to assume that the exhaust is responsible for the entirety of the gains because ambient temps and charge air temps have a dramatic affect on performance figures. However, in my experience the Gibson exhaust did not add anywhere near 30hp or 40ft/lbs of torque any where in the curve. It actually lost about 6hp up top. This just goes to show that you can't just add up the cumulative gains of a bunch of parts and add that to the total and arrive at the final horsepower figure of the car. It just doesn't work that way. Furthermore, I would like to see dyno evidence of FBO, stock turbo EBM running strictly 93 octane achieve 380 hp, much less 410. I just don't believe this is possible given the octane limitation of our engines. 24-25psi tapering to 21 and anymore than 8 degrees of total timing up top and you're knocking on 93 octane. Perhaps the dyno graph really was the Xv1 race gas tune... If so that maybe more believable.
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