Ok heres a quick rundown of my setup jdm GSR skunk2 stage 1's cam gears and intake manifold type r throttle body, jdm itr pistons, hondata s200 adjustable fuel pressure regulator. Now I'm dont know if I should upgrade the injectors or will the stock 240cc's be just fine? And the second question is I have a 95 civic dx so I have the 79 lph fuel pump I believe should I upgrade that to a DOHC vtec fuel pump or is the stock one efficient enough for my setup?

 

definitely change your fuel pump.

 

Any other opinions?

 

get a walbro pump..they're cheaper and better than oem pumps..may be like the 195lph and you'll be golden...then just adjust the fpr...and if you want dohc injectors i have some ls ones for 50 bucks

 

Try this, while being *really honest* about expected HP... in other words, based upon similar configurations that have been dyno'd and not by adding up hp estimates for each part (admit it, we've all done it).

Ok -- using your goal HP, calculate required injector size. Again, you have to make honest decisions about how you're putting it together. Depending upon fuel management, one decision is to stick with stock pressure or use higher pressure with smaller injectors and fuel pressure management (FPM). It depends upon your engine management.

For help with the calculations, check these out:

http://www.rceng.com/technical.htm#WORKSHEET
http://www.holley.com/HiOctn/T....html

Then, find yourself a fuel pump which can do TWO things. First, provide the required fuel flow (lb/min, or liters/min) and SECOND that it can do so and the pressure you are planning to run. In my case, the 190lpm walbro could technically do the job, but dropped off under pressure near the high end... so I needed to opt for the 255 to keep the pressure stable. If the pressure varied widely, tuning could be a challenge. There are usually charts for the pump you are looking at -- just make sure it can do the job.

That's a long(er) answer to your question.

Mark