Originally posted by Chris Hightower:
Just an FYI, the 2.5L V6 running at 7000 RPMs, uses ~306CFM at 1 atmosphere. This doesn't take into account the vacuum that is created with "restrictive" intake parts and valvetrain.
To be able to build up 10 PSI in front of this 306CFM air pump, you would need to have a comressor that can produce 10PSI at ~650CFM.
Thanks for the backup.
My Calc's get around ~320cfm at 7k. (have seen 22lb/min = ~291cfm indicated by MAF. With your 306cfm that's a whopping 95.1% VE Oh Yeah!
)
The S60 might get 300cfm at 10psi. This is what a N/A Duratec gets... Maybe 350cfm at compressor stall (10psi). This is the reason I say it's FAR too small.
The T04B S-3 listed should be around 330cfm at 10psi and ~450cfm max at compressor stall (same 10psi). Much better suited. Great looking map! Decent peak power, but still lacking low pressure CFM IMO. Though it would still make good peak power!
Any turbo will fatten up the bottom & middle range - that's a given...
GoodwinToo is keying on high boost pressure IMO. Yes these turbos flow decent at 15-18 psi. But are lacking at low pressure. S60 especially!
* I also don't understand why he think a turbo's spool up is dependant on max boost level running. Regardless of running 10psi or 20psi a turbo will spool to 10psi at the same rate. It's just once it reaches 10psi the "wastegate" will open so it stops producing more boost.
