Quote:
Originally Posted by Bonburner
That is beautiful work there guys.
Considering how this is for the simple turbo setup do you expect to see a big shift in gas mileage?
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A good clue would be how much boost there is at highway cruising engine speeds. Now since their dyno run starts at ~2500rpm it's a little hard to tell, since the transient response of the turbo is an issue, but it looks like the turbo doesn't really "spool up" until you hit well over 3500rpm.
Any fuel economy loss at steady low load cruising conditions will be due to the turbine adding restriction to the exhaust, which doesn't seem like it's going to be a big deal. Most turbo engines "spool" well before this one does.
Under normal acceleration, engine efficiency will drop a little bit when you use boost, but again it appears there is very little boost below 3000rpm so probably not going to impact fuel economy much.
Best if they can tell you how much boost it builds in the lower engine speed ranges, and if they have any exhaust pressure readings (probably not going to be a significant increase).