As some of you may or may not know, the MY06+ S2000 has a returnless fuel system. From what a few sources have told me in the past, this type of fuel system can only support about 10psi of boost. However, when my S2000 was tuned last year I had no problem boosting 13psi. I had my OEM fuel rail tapped so that I could run a fuel pressure gauge and monitor the fuel pressure during the dyno tuning process. I haven't been back to the dyno, so I haven't been able to do any observations.

Am I correct to think that once the fuel pressure starts dropping off that will be an indicator that the returnless fuel system is maxed out?

 

Easy fix- convert the fuel system to a return type.

 

I know it is an easy fix, but I am wondering what the indicator will be that I need to do the conversion. Regarding the fix, would you simply take the return line from an MY05 or use a steel-braided line?

 

What happens to your fuel pressure at higher boost levels?

I would personally use a hardline.

 

[QUOTE=Asura,Nov 19 2007, 04:07 PM] What happens to your fuel pressure dropping at higher boost levels?

 

Go do a baseline somewhere local and see before you start changing things.
Be a good idea to know what you are trying to fix, and if it is indeed working.

 

I understand the concern with running steel-braided lines vice hardlines for the fuel lines, but since my S2000 is a drag race only car shouldn't it be ok? Isn't the biggest concern running over something and puncturing the steel-braided line?

 

So, I am correct to think that if the fuel pressure starts to drop as the power is increasing that the returnless fuel system is maxed?

 

FYI...Shawn will be re-tuning my car sometime in the April 2008 timeframe.

 

I won't make an assumption. Your actual observation is more important.