FRX question

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Feb 28, 2013 | 08:04 PM

MTRoofer

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From: Montana

FRX question

Hello all, have a 2001 f-350 with 235,000 miles. 6637 intake, new ebpv and tube is all I have done to it so far. Just orderded from Clay intercooler boots/plenum inserts, frx kit, hpx kit and ccv kit. My question is I see the frx comes with three springs for different fuel pressure, which one shoul I be using? Thanks guys.

Feb 28, 2013 | 08:22 PM

Christof13T

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Joined: Apr 2012

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From: North Georgia

Most use the gold one.

Feb 28, 2013 | 08:26 PM

twg1966

Trying to Gain Knowledge

Joined: Jun 2003

Posts: 1,571

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From: Ezzell, TX

I used the black one and someone from the first STTD got my gold one.

Feb 28, 2013 | 08:32 PM

Chris123NT

Senior User

Joined: Feb 2013

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From: Long Island

The gold one is the most common one to use and usually puts the pressure right in the "sweet spot".

Mar 5, 2013 | 06:18 PM

Jamie Arceneaux

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Joined: Dec 2011

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From: Needville (Houston) Texas

I had the same issue so I hit Clay up on face book and he told me the same thing as here, the gold one! Installing mine this weekend.

Mar 5, 2013 | 07:05 PM

truck7575

More Turbo

Joined: Apr 2012

Posts: 628

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From: Florence

today i rebuilt my fuel bowl with a diesel o rings kit and installed the Frx from riffraff. I also chose the gold spring, I have not got it back in the truck but i hope to have everything back together here in the next week. I have everything on top of engine removed for rebuilding or upgrading.

Mar 5, 2013 | 07:21 PM

JOHN2001

Logistics Pro

Joined: Dec 2010

Posts: 4,738

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From: Temperance, MI

What is "the sweet spot"? My fuel system is bone stock and I'm at 72psi in the drive way and 58 psi at wide open throttle

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Mar 5, 2013 | 08:06 PM

howellt39

Senior User

Joined: May 2011

Posts: 454

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From: Portland, OR

Gold spring installed a few thousand miles ago, stock injectors. No problems at all.

Mar 5, 2013 | 09:37 PM

#10

JOHN2001

Logistics Pro

Joined: Dec 2010

Posts: 4,738

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From: Temperance, MI

Quote:

Originally Posted by joeyd61

to most, the sweet spot is 60-70 psi.

I thought I read somewhere 55 psi idling was what was to be expected... That's why I ask thanks joey

Mar 5, 2013 | 10:37 PM

#11

MTRoofer

Thread Starter

Freshman User

Joined: Aug 2012

Posts: 39

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From: Montana

Found a box with yellow tape on it outside the shop yesterday, wasn't planning on it arriving till later in the week(thanks Clay, super fast shipping), decided to tear into it today. Pulled the spider and intercooler pipes to replace the boots, installed plenum inserts, FRX (used the gold spring, thanks guys), installed the HPX and did some painting. After clearing the air out of the system for a few miles the truck really takes off now. Seems to start alot easier and definatly has some more get up and go. Hate this site, but love it at the same time. Prior to this truck two years ago, I was a guy that never even changed his own oil, now I get ideas on this forum, watch a few youtube videos and think I am a diesel mechanic. Six hours start to finish for a very novice guy. Next the tank comes out for the hutch/harpoon.