do you mean the presure in the return line? i dont know i didnt measure this, but cant be a problem since it seems that single stock reg was the botle neck in the sytem causing the uncontrolable high base fuel pressure. i was getting worried that it was the resistance in the return line causing the pressure to spike. but the test proved it was adaquite.

Before the testing and the upgraded fuel system the car was running 2x 680cc and 4x 550cc total 3.5L/min
now ive intalled 2x 550cc and 2x 1680cc total 4.5L so even in this situation i will probable see the injector max out before the pump. I guess the duty cycle i run will depend on the turbo and boost, but i would like to talk it to the max to test the theory

cheers :) !

ahh that sux! was there not enough meat on the housing to remachine to a 3"?

Hey smart dudes this may seem like an overly stupid question but im trying to figure out the whole point of this test cuz it seems like your trying to find out what fuel pressure the stock fuel system can handle (with the exception of the fuel pumps). Would that be the right reasoning for your experiment? Cuz i mean how much fuel pressure does one really need other than stock pressure? And does it depend soley on amount of boost your running?

Thanks and sorry for being a noob to this

the tested was used to determine fuel volume

like Driftlanta mentioned above the test was to determine fuel volume at a given pressure. Its easy to flow large volume at low pressure but with boost the fuel pressure will rise 1:1 with the boost increase, and then its more work on the pump to maintain flow at high levels of fuel pressure or line resistance. thats why i did the 65psi tests and measured the flow in L/min

Possibly, I considered that when i got it at work. But decided it would be cheaper faster and easier to just weld the 3" V-band i had. I'll just buy another one monday.

This way i could alway machine it later, or cut off the flange i welded and make a 4" exhaust :D