I’m in need of another opinion on this matter… I’ve got a built PL GT35R G35 Coupe; it’s currently making 466 whp on 14 psi… I’ve got some downtime to add a few tings to the car and I was thinking about adding a basic RFS to my car. Currently, my fuel system is a Walbro 255 LPH fuel pump and Deatschwerks 600 cc injectors (on 14 psi they were at 85% duty); I’m also running a ProEFI 48 computer on my car.

My car has been running alright without a return fuel system, no issues at the dyno, etc. But I was wondering if a RFS would make a difference? Would it make the car’s fueling safe? more consistent? Improve efficiency? …I’m not really sure as I haven’t had any glaring issues with my current fuel setup, so I just wanted some additional input! I might try for 500 whp too in the near future.

Thanks!

 

yessir... more air/boost = bigger injectors and time for an rfs.
Call Pete! He will tell you exactly why in great detail.


Im running an RFS on my set up w larger injectors and a bigger turbo 6266 precision.
I assume you are rolling stock block and the 35 garret set up?

I guess now i should say, what boost are you at now and what does your block build look like? If youre 466 w a stock block.. meh, yer pushing it now man.. rfs is there for you if you want to roll quite a bit more boost and the injectors and fuel pump action to go along w it.

 

Aside from making your tune more consistent, it evens out the flow of fuel to all the injectors which is beneficial to making max power and longevity+reliability with boost. So even if they are not maxing out you still benefit in having one.

 

I'm on a built motor (pistons, rods, etc., ...stock heads) right now. Just wanted to see if anyone has noticed an appreciable difference with a RFS vs the stock setup.

Djamps, do you think I'd be alright with a CJM stage 0 RFS? I'm Just shooting for 525 whp on pump gas.

One thing I have noticed is on warm - hot days my car has some very noticeable hesitation at 10+ psi while going WOT in higher gears, mainly 5th...

 

How I've always understood it.

 

the rising rate fuel pressure regulator is worth the expense alone!

 

I saw a difference in the ability to control lean spots better where the fuel no longer would drop off for a second as pressure was much more consistent thank my stock fuel system. The adjustment of fuel pressure is one of the most important parts of any boosted car IMO. No fuel under boost = BOOM!

I would never think of running a boosted car again without a RFS, the CJM stuff is fantastic and you cannot go wrong.

 

Thanks for the input everyone!

So just to be sure… (I need this spelled out, lol)

I should buy the Stage 0 Return Fuel System from CJM? Yes?

http://shop.cj-motorsports.com/CJM-S...m-DEstage0.htm

 

Yes

Just a heads up, the photos dont reflect it yet, but the S0 kit has been updated. The fitting that attaches to the rear of the drivers side rail has been changed. Rather than replacing the fuel pulsation dampener, it spaces it back and T's off for the fuel return line.

Also, the recently more popular Fuelab regulators have been on backorder since Febuary.. so we are only able to process orders with the Aeromotive.

 

fuel system is the only thing im up in the air on currently myself.. not sure what they are sticking me w/giving to me.

rfs yes, but whos pumps, whos sytem etc.. dunno.

 

Like everyone has said, an RFS is definitely a good idea for a boosted Z. If you have any specific questions, don't hesitate to PM me!

 

Thanks Charles! I was wondering about the dampers on the stage 0 and I actually wanted the Aeromotive so no worries there. Are the stage 0’s ready to ship, btw?

@bmccann: Well, I’m going with CJM, no question; I’m not even considering the other options. I was just wasn’t sure if the stage 0 would be worth it or not (stage 1 would be really, really difficult for me to purchase right now). But I think I’m going to be putting in the order at the end of the month!

Thanks again everyone!

 

Ya the Stage 0 kits are same day to 24 hours out right now, depending on regulator stock at the moment of ordering... we buy them like 3-5 at a time from a local distributor that stocks a ton and I dont think I have ever seen them run out of the Aeromotive ones.. they come in the next morning when I order.

 

WHats the main diff. between Aero and Fuelab ?

 

Effectively, nothing. The aeromotive is only red, FL offered in various colors but not many stock it outside of black. So we use it to provide an alternate color.

The FL costs us about what the aeromotive cost us a few years ago, allowing us to not have to charge as much with no sacrifice in quality.

The FL is a tad smaller but I don't think many would notice unless holding both at the same time.

 

Also, we have not yet tested the FL with a twin pump so while I doubt it would have a problem, I cannot yet promise that the FL can hold lower pressures at idle with a twin

 

CJM is the way to go - outstanding product(s) and customer service!

 

the aeromotive has a 1/4 or so return valve and runs down to mid 30psi. I'm sure the fuelab will do the same with no issue

 

my car has been boosted for over 5 years without a return kit. never knew about the stage 0, i thought my only option would cost over 1k$, gonna be buying the stage 0 asap.

 

Charles,

Would your upgraded fuel rails be to much for just a stock block jwt TT kit?

Already have your stg 0 RFS kit quite impressed with the quality.