what is the duty cycle of a integra ls's injectors at full throttle and the stock fuel pumps lph

 

ttt

 

Don't know the answer to your question, directly, but...

I did read that the Type R's (same injectors) hit 100% at redline.

On the whole subject, however, I'm not always seeing a wholistic approach to the fuel system. It is the combination of volume and pressure that determine flow rate -- and those factors can also influence the quality of atomization, and consequently combustion efficiency.

Consider the pump, can it deliver the rated flow (lbs/hour or cc/min) <U>while maintaining steady pressure</U> ? Trying to compensate for an anemic delivery system through tuning seems.. less likely to really nail the target consistently.

So back to the stock injectors.. are you increasing pressure to get the flow required? Some do, some just use larger injectors at the "standard" pressure of (about?) 42psi. That factor alone can result in wildly different injector size requirements.

The progression I use starts with a horsepower goal, and engine 'architecture' (e.g. NA or boost). The choice of NA or boost helps determine a starting BSFC value, to use in calculating how many cc/min or lbs/hour are needed just to produce the raw HP, regardless of any other factors.

That done, decide on the pressure boost w/smaller injector .vs. lower pressure with larger injectors matter. That choice is driven by budget, engine management, and other factors. Once the decision is made, get the right size injectors to deliver the fuel required by your first calculation (lbs/hour).

That done, get a fuel pump and plumbing which can deliver that much fuel without losing the ability to maintain the desired fuel pressure (in psi). Read the charts that go with the pumps you're selecting.

What's the point if you get a pump and injector setup but restrict it with stock fuel line and filter? With modest NA, maybe no problem but with serious boost, perhaps you go lean and self-destruct? It's worth checking.

Ok.. lecture off ( )

Hope the thoughts are helpful.

Have fun,

Mark