Quote:
Originally Posted by serialk11r
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).
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Previously I had 4psi at 2800rpm. The dynojet 24" roller does not have the weighr resistance like the car. We are actually allowing the turbo to come on a bit smoother so that we do not have to much torque down low on the stock engine. All I would need to do is put a 10psi wastegate spring in it and it would come on much harder. I want to know what this will do reliably. We could always crank on it, but its not what we were after. I could post up a final run count, but i'm sure its around 170 Dyno pulls now since turbo.
Don