Quote:
Originally Posted by madfast
a centrifugal compressor by definition is not liner. some people feel it and/or care, while others dont mind. we're all nitpicking here. so yeah it isnt that big a deal, but to some it may be, so we cant just sweep it under the rug. statements like "modern turbos have no lag" are just as dumb as "all turbos are laggy". the truth is somewhere in between and very personal to the driver's taste... the perfect example is the 335i vs 330i. the 335i is nowhere near "laggy" or lacking in response, yet the 330i is still more responsive albeit way slower.
my opinion is that for low boost a roots SC is the best option, then rotrex, then turbo. that's me. i like responsiveness  |
Quote:
Originally Posted by madfast
my daily driver is an evo x. its not very laggy but there is still lag. every turbo car i've ever driven both stock and modified had some lag. i notice it because i look for it. its not that big of a deal overall, but its still something i wouldnt miss if it were gone. again, turbo lag didnt prevent me from buying a turbo car, but i also dont act as if there is no lag at all.
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i believe we can agree to disagree.
i guess what it comes down to for me is that the FA20 isn't going to lose any of its stock torque response with a turbo, and because it's such high compression, it won't rely so much upon the boost to create torque. it's just going to make more of it with the boost.
i'm honestly not familiar enough with the 335i and 330i engines to comment very much on that, but how much difference in compression ratios is there between the two? that, in my mind, plays a HUGE part in responsiveness to throttle inputs. my high compression 3SGTE with the same cams, same turbo, same throttle body, similar intercooler and nearly identical exhaust is unbelievably more responsive than my good friend's low compression (by design, not because of wear) 3SGTE. in his car, you wait for the boost to come on before you get much torque/response. in mine, you don't have to. it drives extremely well in vacuum.
i still notice the lag, however small it is with my setup, in day to day traffic situations. during sporty driving, though, my revs are up and i'm rolling into the throttle coming out of corners, so it's basically a non-issue.