oceanblue2019
Well-Known Member
Or worse. If you exceed the shaft speed maximum if you are lucky you seize it, if you are unlucky the turbo comes apart and fills your intake/intercooler/engine with metal pieces.This is a really good point to make. If a turbo is spun above it's operational RPM range it essentially becomes less effective. I think this is why a lot of OEM kits lag on the bottom end, so the functional range carries through the top of the RPM range. I think that is why a lot of guys use twin turbos for maximum RPM range output.
In the past materials and manufacturing techniques did not allow the high speeds and reliability that a modern turbo can handle. Today it's pretty seldom to see catastrophic failures on OEM turbo engines.
Twin turbo's on V engines are now more for packaging size and under-hood temperatures - not efficient to run both sides of the engines exhaust to one big turbo so a smaller turbo on each side of the engine to handle 1/2 the cylinders makes sense.
Or you go fancy and flip the intake and exhaust ports around so the turbos are in the engine valley for super short exhaust runs and compact packaging. Audi's doing this on their newer V6's and they are monsters - both in power but also maintenance nightmares
Sponsored