Quote:
Originally Posted by Sol4rfl4re
The lower the boost levels the more identical the power will look. For example at 7psi the D1 might only make 10whp more than the P1, at 10psi the D1 might make 25 more, and so on. From what I've seen the D1 will use a one size larger pulley to keep psi even with P1, so same pulley D1 will make slightly more, how much more depends on pulley chosen.
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Man I hate to be the guy to say this....
BUT, please don't spread information like this, without actual data.
This is how internet rumors get started.
The boost and power curves of the P1 and D1 are identical. (same with outlet temp) When you match the boost/cfm flow to each other.
EXAMPLE: If you have....
Car #1: 4.00" pulley on a P1 car and make 600hp and 8psi
Car #2: 4.25" pulley on a D1 car and make 600hp and 8psi
You would NEVER be able to tell which car has what blower.
Since everything about them would be identical...
(I know this because I have done this test many times)
The ONLY difference is that the D1 moves more air per revolution.
So thus, it needs a larger pulley to match the boost...
AND it can make about 100 more HP on the top over the P1.
But yes, the blowers will stop flowing right at their redline of impeller speed.
That's why we have the "redline" max rpm rating. It's not only because of gearbox safety... but also because that's pretty much where the power stops.
The D1X is a different story, (and p1x) since they are unrelated in impeller design.
Thanks!
Erik Radzins
NOTE ON SOUND:
All P1, P1X, D1, D1X will sound the same. Since they share the same gearboxes.
Standard straight cut is louder,
Helical gears are for more reduced sound,