Quote:
Originally Posted by Phantom10R
Quote:
Originally Posted by johnung
I was able to pull the MAF values at a range of RPMs from your before and after logs and enter them into the attached table.
It's interesting that your airflow numbers from 3000-3500 RPMs are significantly lower with the Pure Turbo inlet pipe.
There was no difference from 4000-4500 RPMs. But there was a significant 8%-9% airflow increase from 5000-5500 RPMs and an airflow increase of 4%-5% continued from 6000-6500 RPMs.
Of course this is all assuming that the logs were taken under exactly the same conditions and there were no other variables. Also assumes that this is reproducible if more before and after logs were taken.
I'm not sure how to account for lower air flow at lower RPMs. I don't remember much flow dynamics from physics class. The main physical difference between the two pipes is that the PT pipe does not have the constriction at the end so it can handle 42% more flow than the stock pipe right as it enters the turbo.
This is pure speculation on my part but maybe the larger PT pipe exit reduces velocity at lower RPMs so that actually makes for less flow until engine speed increases enough to utilize the higher flow capacity of the PT inlet pipe.
Pray For Mojo did you notice less engine response below 4000 RPM? Are there any flow dynamics guys out there or anyone else who has added a Pure Turbos Inlet pipe to an N55 with a stock turbo? Please chime in.
|
Velocity... exactly |
Ahh, so if these numbers are real and reproducible, then it appears that adding the Pure Turbo inlet to an N55 stock turbo car would increase MAF airflow/horsepower at 5000 RPMs and above, but it would reduce responsiveness below 4000 RPMs.
One of the things that makes the N55 so attractive is the low end torque that makes it so responsive and drivable. So the numbers would seem to be against adding the PT inlet to a stock turbo car.
Anyone else out there who has done this? Did it reduce low end response from standing starts or when you need to suddenly accelerate to pass?