Quote:
Originally Posted by cleanspeed1
An application like this would not need a VNT style turbo, it would be overkill. The flow requirements are too small and he's not going for the big top end. A fixed geometry turbo with a properly tuned pump will get the job done.
If anything, a little Roots blower would be even better, since boost response is instantaneous; but he didn't ask for that.  |
You don't need to seek big top end with VNT, you can get smaller one that would give that boost from idle, many small diesels around here have such small VNT turbo that boosts from very low rpm and there is not big power at top, torque is flat from 1000rpm to almost 4000rpm.
Regular turbo is really difficult to make work how Christ described, imo. Usually there is not much of boost under 1500rpm in such small motor, unless you put undersize turbo which is then really a problem at higher rpm, in my understanding such setup is very prone to failure, or then turbo exhaust side must be so large that there is no real boost from idle.