ipp pressures

[Dave]

Yeh at high RPM you're battling so many of mother natures natural enemies trying to hold you back, not only do you need to get fuel in quicker, you need to start injecting more fuel sooner, which means you need to maintain an even HIGHER IPP to counteract this.
In counteracting the top end stuff, it means that the VE's are horrendous bottom end/mid range. VE's really are not great for the top end stuff haha.

[nominous]

Isn't the IPP linear with RPM ?
So changing this to be more of a curve would give you low control and high RPM pressure.

The ALFB aids this by blocking the governor from bleeding off at high load and over a set RPM. - tho I'd need to measure what that RPM is

[Ruan]

IPP *SHOULD* be linear with RPM for a given throttle position...

Unless your vane pump is worn and/or it's starving for fuel...

ALFB should raise pressure due to governor tension at lower RPMs also to raise advance. From experience pumps without ALFB are linear with RPM - pumps with ALFB are not linear - changes of throttle above about 1200RPM will cause it to change pressure.