Newbie GT wrote:http://legacygt.com/forums/showthread.php/spool-study-between-vf46-and-vf52-198675.html
interesting does this really show true comparison?
That's a really interesting comparison. According to that, at no time is the car with the VF52 producing less power or torque than the VF46 equipped car.
Assuming all other things are equal (and that is a big assumption, I'll say why in a minute), that would indicate that although the VF52 spools later, at no stage does it produce less boost than the VF46 (as boost is critical to torque and thus power production).
One thing to note is that this testing was done on cars with FMICs. FMICs have different characteristics to TMICs (otherwise people wouldn't use them) which may or may not influence spool-up speed (there is a generally [but not 100%] held thought that FMICs introduce additional turbo lag due to the larger air volumes they contain when compared to TMIC setups) - and it's theoretically possible that this additional lag may impact the VF46 more detrimentally than it impacts a VF52.
And of course, the VF52 in this case has tubular headers, which may have an impact on spool speed as well.
So, in the end, this comparison is most useful if you have exactly the same mods as the cars listed in the article. If not, then the results you see may well be different.
