I guess the HPPs are better at simulating what you know from a road car.What they mean is that the HPP Pedals have a fake hydraulik system of master cylinder, fluid reservoir and pressure transducer to measure the pressure. While the HEs have a gas-spring to damp the movement of pedals and probably a loadcell to measure the force.
Gas-Springs on the throttle padel is a nice thing, we have that on our Formula Student car too but both Pedalsets are ill advised if they think that the brake padel on a pure hydraulik brake has (hydraulik) damping. The hydraulik fluid in a brake system is there to transmit the pressure, the volum flow is very small. Stepping in the brake pedal on a race car is like kicking a rock (if the brake is bleed well). You have minimal travel and it's like hitting a rock, there can be no damping as there is no movement. What HPP does is expensiv but pointless, a loadcell is equally good in measuring the pedal force as putting pressure on a fluid to measure the pressure of the fluid with a transducer and reverting it into an electric signal exactly like the loadcell does but more expensive. What should be a bigger concern to any driver is that because of this wide and silly hydraulic unit of the HPPs the minimum distance between throttle and brake pedal is quite big...
There are quite a few more flaws visible on first look about the HHP but this post is not ablut that.
I also really don't see much that justify the price difference between the HEs and the PT2. They maybe have a bit less friction but for that price... It's surely not the Gas-Springs, if you need those badly get a few: https://www.ace-ace.de/de/produkte/geschwindigkeitsregulierung/industrie-gasdruckfedern/gs-8-bis-gs-70/gs-8/gs-8-50.htmlI guess the HPPs are better at simulating what you know from a road car.
Currently I couldn’t justify either. When looking at the protosimtech PT2, which look like a hard bite of the HEs tbh, they are 400$. The HE ultimates with pedal base are 1400€, the HPPs similar because you have to pay import tax in Germany.
That’s just wow compared to the 360€ of the CSPs.
I have a construction from our formula student car. That pedal set is properly overengineered to the max xDCan you build me pedals miagi