scalbert

I went out this morning in almost identical conditions that I have achieved my best 0-60 times with the intake only. This was for comparison. Temps were in the low 30's and nice conditions.

When I ran in nearly the same weather with just the intake I got a best of 5.83 and could was consistent in the mid to high 5.8's.

Today the first run was with a light launch and resulted in a 5.75. The next two were launched harder, full TC load, and resulted in a 5.67 & 5.68, not bad repeatability...

So, as expected, the headers were good for a solid 2 tenths 0 - 60, possibly more. I had guessed that it would be about this amount since nearly 1/3 of the 0-60 run is in a RPM range that the headers provide really no gain. I suspect 1320' ETs would be an even greater margin.

Now, how accurate is the time. Most agree that using a single unit in the basically the same conditions and the same spot will be useful to determine gains, differences. But what of the absolute accuracy.

Testing last summer in stock form with temps in the 80's I was able to repeatedly attain 6.4's. Not a stretch for a hard launched stock CL-S. On the same day as swapping out the intake, I was able to constantly drop the times nearly a 1/4 second. Add another 2 tenths now with the headers and a normal time of 6 flat would be possible in those same conditions. Now I know this could be a bit generous, maybe a tenth or two.

But how can I get 5.6's?? By being in 50 degree lower temps with lower humidity and a higher baro. Simple, this would easily account for 3 - 4 tenths. If not more…

So the times could be within reason. However, these cooler temps allow everyone to run quicker.