GT4
Nordschleife
- Joined
- 8 Nov 2008
- Messages
- 30,181
doulas bader said:Thanks GT-4 - most illuminating and explains why I couldn't find the centre rad on my Anniversary car (no extra safety margin on cooling for me, then - why did they leave the centre rad out on my car?).
Do you have the 3.6 X51 power curve comparison in a format I can download?
The Turbo/wide-bodied nose cars (ie C4S and Annivesary/40 Jarhe) do not have the third centre rad as they already feature the larger Turbo rads and front PU with matching larger apertures.
The third rad adds between 25% and 50% more cooling (this is based on both surface area comparison and the larger air pressure available at the centre of the frontal area, rather than aerodynamic edge bleed evident on the side rads).
I am not sure of the Turbo vs standard rads efficacy, but a simple surface area comparison would give an almost exact calculation.
If you click on the above jpeg you can save it to your PC etc.
Other than that version (which is slightly cleaned up and contrast enhanced), I have the page scan in PDF, which I can email if you PM me.
The actual source of the chart is the 996 3.6 Carrera brochure from circa 2003.
I only have a poor scan, if you could get hold of the original hard-backed brochure or a better scan, it will show it better.