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Old 05-02-2009, 05:09 AM   #45
davidj
 
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Join Date: Mar 2009
Location: Ventura, Ca
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Quote:
Originally Posted by Gary B View Post
Todays dual ball-bearing turbos spool up crazy fast! You ever ride a turbo Hayabusa with over 500rwhp? Ain't much lag there!!! I bet you'll have positive boost before 2000 rpm.
Turbo's have come a long way in design. Along with ball-bearings, Variable geometry Turbo's utilise a set of vanes in the exhaust housing to maintain a constant gas velocity across the turbine, the same kind of control as used on power plant turbines. These turbochargers have minimal amount of lag, have a low boost threshold (with full boost as low as 1,500 rpm), and are efficient at higher engine speeds (they are designed to operate in its optimum A/R Ratio at any RPM). In many configurations, VGTs do not even require a wastegate.
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