EK9MAX

At what point do the 2006+ ap2 need to convert to a return fuel system?

Got a novi 1200 going on with a 3.4" pulley soon.

ID1000's and AEM 320lph pump.

Thank you in advance for your replies.

benes2k

with your set up you wont ever need to convert.

normally after 500 hp people upgrade the fuel system to prevent possible pressure differences between the injectors and to keep the injector duty cycle as low as possible.

crxdx

I maxed out my aero 340lph with id1ks just under 450hp on pump 93. Since then I have upgraded to 1300's and sos return kit.

riceball777

I believe the limits of the stock 2006+ returnless fuel lines are 500whp on 91/93octane/race gas and 400whp for e85.

EK9MAX

I should be hovering around 400whp. So hopefully I'm ok.

06S2k07Si

I'm about to go down this path as well (my car is a 2006). I'm currently on ID1000''s and ran completely out of fuel at 402whp @ about 7500rpm. I started to go lean at 6800. This is with a completely OEM fuel system and ID 1000's. I've read that just upgrading the pump should be good to around 450whp. I've decided to get a return system so I won't have any more fuel issues.

My build...
https://www.s2ki.com/s2000/topic/108...rotrex-c38-92/

crxdx

No way you will get 500whp or even near it on returnless running e85 or 93 and under. Unless your on a very high reading dyno.

Here is a link to the sos return kit and a in depth explanation of the limitations and why.

http://www.scienceofspeed.com/produc...em_conversion/

EK9MAX

500whp is not in the plans. I know I won't get there. I just want 400whp on pump gas and stock exhaust.

crxdx

Then your good.