Ok, let me make an attempt to make some sense out of this.
First, we have different TD06s. We have Greddy TD06S-20Gs. Since Greddy doesn't release their data, the best we can do is to find something close. But a real TD06S-20G compressor map might look quite different.The TD05 vs engine flow graph used 100% VE. But TD06 graph didn't. It used less than 100% on the topend. This way all the engine flow is skewed to the left. So that's not a fair comparison of 2 turbos. I would argue that involving VE (volumetric efficiency) into the compressor vs engine flow graph is too complicated and not very accurate. VE depends on too many factors. Without calculating the air density or use MAF reading (a far less accurate way), I won't know if VE is 85% or 95% at a particular point. All the calculation and plugging engine flow, I always used 100% as best case senario. Lastly to say TD06-20Gs are too big for our engine is too general. I could have an engine built very efficiently to have close to 100% VE maybe with help of NOS or WI to cool the intake charge. And in a drag race or top end run, my engine is revved so high even after I upshift each gear, my rpm would still not fall low enough into the compressor surge area. Then I'm really not that concerned with the turbos outflows the engine at low engine speed and low manifold pressure.
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