What's your 1/4 MPH w/ 4x720cc injectors?
 

I run 4x720cc but have not taken the car to the track. They are to far away.

I’m currious to see how well this aerodynamic principle adheres to reality:

F2/F1 ~ (V2/V1) **2

Knowing the following:
- Force F1 (but we’ll let it be in this case the total initial injector size),
- the speed (V1) through the ¼ with F1 injectors,
- and the new total injector size (F2),
Solving for V2 should be roughly the speed that can be had with F2.

Let’s agree that a TII (or any turbo’ed FC) that has been mildly modifyed to safely/reliably run on the 4x550cc will be at around 100 mph thought the 1/4. Let’s also assume the BSFC through the power curve are in synch for the most part going from 4x550cc injectors to 4x720cc injectors.

Solving for V2 we get 114 mph! :scratch:

I’d settle w/ ~108-110. And from the seat–off-pants, it sure seems that way.

Your equation assumes that quarter mile times can be directly correlated to injector size with no other variables when this is not the case in reality.

A more relevant comparison would be turbo size/airflow or horsepower to quarter mile trap times, and even then a lot of variables like mixture, timing, torque band and tires will be left out. You can change the injector size all you want, but it won't make a bit of difference unless you cram more air into the engine.

The equation assumes that an X additional amount of fuel is required to go from Y mph to Z mph at the 1/4 mark. I understand there are many variables.

And, w/out saying, I also realize not just more fuel = more power. The engine needs to be configured correclty to handle the additional boosted mass air flow.

I'm not asking for the flaws in the approach. As I said, I'm curious what MPH , not ETs, when running 4x720cc injectors.

So let's see what them #s are!