[SmsAlSuwaidi]

Originally Posted by AVOturboworld

But those Legacy motors that made peak at 2400 rpm were not designed for torque - it's the same base EJ207 as been used in the STI twinscroll... that makes it's peak torque at 3600rpm. Difference was in the turbocharger setup itself and the tune. Just like the bigger turbo vs. smaller turbo argument here, they swapped low end torque and response (VF38) for top end performance (VF36/37).

And my argument was, if a bigger turbo is "inherently" safer because of "gradual" torque (and I'm still not sure how jumping 200ft/lbs over a 1000rpm range is gradual), then why doesn't the manufacturers clue in to that?

The easy answer to that is that, for them and their customers, it is about daily driver response, gas mileage, and area under the curve. And given their budgets, they can and do design and tune for a turbo that will work through closed and open loop with reliability and smoothness.

The new Legacy motor that made peak at 2000rpm? A variant of the FA20, the turbo version.

What about the ability of these small turbos to hold to redline, even in the graph you guys posted above it tapers off after 7000 ?


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