Change of ITB leads to change of engine characteristics?

[Nux]

Originally Posted by manbridge 74

https://www.sae.org/publications/technical-papers/content/2017-01-1078/

Below is a quote from the above SAE document that might help with your VE calculations

“The model predictions showed a smaller pumping loss associated with the butterfly valve until 30˚ throttle opening. Between 30˚and 70˚ throttle openings, both designs have shown similar performance. However, beyond 70˚ throttle opening, a significant performance enhancement is observed with the proposed barrel type. Specifically, an increase of 34% in mass flow rate at WOT is observed as an indication of better engine performance with the proposed throttle valve design. This is particularly important for racing vehicles.”

Excatly. Our tests show 22% better flow than conventional butterfly ITBs. Some have been concerned about part throttle response, but we do not have any issues with that due to the oval design.

[panzerfaust]

Originally Posted by manbridge 74

https://www.sae.org/publications/technical-papers/content/2017-01-1078/

Below is a quote from the above SAE document that might help with your VE calculations

“The model predictions showed a smaller pumping loss associated with the butterfly valve until 30˚ throttle opening. Between 30˚and 70˚ throttle openings, both designs have shown similar performance. However, beyond 70˚ throttle opening, a significant performance enhancement is observed with the proposed barrel type. Specifically, an increase of 34% in mass flow rate at WOT is observed as an indication of better engine performance with the proposed throttle valve design. This is particularly important for racing vehicles.”

yes they are beneficial... we had barrel throttle ITBs on our Western Washington University race cars 30years ago. It ended up winning the Pike's Peak hill climb in the experimental division with smashing the track record. 2 place was a minute behind as I recall