Originally Posted by
mko
You don't get it. turbo exhaust housings have numbers 0.42 , 0.48, 0.63, 0.76, 0.98 and many other. The smaller the number is the faster the spool up will be at lower RPMs, the higher the number is - turbo will spool up at higher RPMs. Now with that said, if i put a 14b cartridge on 0.98 housing /although i doubt it will fit/ it will still spool at 8-10k RPMs. And if I put a 70 trim turbo on a 6cm housing it will spool at 2500 RPMs, because the housing is designed to rush more exhaust gases thru the fins and make it spin faster.
The cold side of the turbo has number too, identical to the exhaust numbers. For the cold side these numbers mean the turbo will be out of its power range and CFMs it supports /runs out of boost/. a 14b which has a number of 0.42 I think and will make that much boost at these RPMs before the map starts going down /it ran out of air/
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