72psi with Blue spring upgrade - Diesel Forum

mwilbur516 · 02-03-2011, 06:25 PM

I did the blue spring upgrade and now I'm at about 72psi at idle. I know its been said that 70psi is the max, but will 72psi hurt anything? I figure the spring will eventually loosen up and the 72 will drop to around 70. Is this just wishful thinking? I don't want to have to pull the spring out and grind it down if it isn't necessary. Let me know what you guys think.

ex mounty · 02-03-2011, 07:14 PM

I would leave it alone. It will probably "break in" over time. I wouldn't be too worried over a mere 2 psi anyway.
Thats my guess anyway, for whatever its worth.

mwilbur516 · 02-03-2011, 07:52 PM

Thats what I was thinkin'. I guess a little to high is better than a little to low. If the GDS spring brings the pressure up to 90-100psi, 72psi can't be that horrible.

2 Stroker · 02-03-2011, 08:24 PM

Over the past few months mine has came down about 2-3 lbs it will settle in and you will be go.

2 stroker

dikkstarr · 02-04-2011, 04:34 AM

Over 70 is scary to me, I wouldnt run it.

If 45psi is the point where you would have injector starvation and failure, would you run 43psi??

C'mon Its only a meezly 2psi!!

No thanks!!

Over 70 is where trouble starts, expensive trouble.

Is it worth it? Its easy to change that spring, but changing and buying injectors sux!!

Just a thought.

MattShade · 02-04-2011, 07:35 AM

You also have to question the accuracy of the gauge. I don't know what kind of accuracy they guarantee but it wouldn't surprise me if they're off by 1 or 2 psi, thats a relatively small percentage and its not like we calibrate them against anything when we install them. I'd think a reading of 72 is safe, but I'm no expert.

mixerdrvr · 02-04-2011, 09:03 AM

Quote:

Originally Posted by mwilbur516

I did the blue spring upgrade and now I'm at about 72psi at idle. I know its been said that 70psi is the max, but will 72psi hurt anything? I figure the spring will eventually loosen up and the 72 will drop to around 70. Is this just wishful thinking? I don't want to have to pull the spring out and grind it down if it isn't necessary. Let me know what you guys think.

"70psi is in spec. give the gauge 2-3 +/- psi. he is close enugh. being the spring is new it may settle a little bit as well." Posted by a ford master tech on another site. I have the same spring and the same pressure. I would not worry about it. Does your pressure drop while driving? at wot?

mwilbur516 · 02-04-2011, 06:10 PM

Normal driving I'm at 70psi and at WOT the lowest I've seen is about 63psi. I think I'm gonna leave it. Now had it been 75-80psi I would've pulled the spring and trimmed it a little.

ex mounty · 02-04-2011, 07:00 PM

Quote:

Originally Posted by dikkstarr

Over 70 is scary to me, I wouldnt run it.
If 45psi is the point where you would have injector starvation and failure, would you run 43psi??
C'mon Its only a meezly 2psi!!
No thanks!!
Over 70 is where trouble starts, expensive trouble.

IF the 45 psi is the low point where injector damage occurs, I wouldn't run my truck with less than 50psi, not even 49.
However, after reading about more than a few guys running the GDS spring for a long term (which boosts it to 100psi), a MERE 2 psi above the intended target of 70psi would tend to not bother me much, if at all. Especially since it is a Ford part manufactured for the intended use.

lenzhotrod · 02-04-2011, 08:41 PM

72 PSI is fine as others stated. I would bet that a reading from the back of the head (after fuel has been past the injectors) would be about 65 PSI. Wish it was easy to access the plug for a test.

Mean Green · 02-05-2011, 06:25 AM

What is the reason for installing the "blue" spring? sorry for the newbe question.

mwilbur516 · 02-05-2011, 08:49 AM

If you read the post you'll see that the blue spring pushes the fuel pressure up to acceptable levels. Anything below 45psi is too low and will cause damage to injectors and anything above 70 psi will cause damage to injector o-rings. The GDS spring pushes pressure up to around 100psi. People run the GDS spring all the time without problems, so thats part of the reason why I'm leaving my blue spring in. If 100psi isn't blowing the o-rings out then 72psi shouldn't have any ill effects (hopefully). The blue spring is a part made and sold by Ford as a replacement part for your stock spring. Thats another reason that I'm not too worried.

dikkstarr · 02-06-2011, 10:40 PM

I guess its ok then if others are running 100psi.

My blue spring made 78psi, that freaked me out so I yanked it and used a ball bearing with the stocker.

I didnt want to take any chances with o-ring failure.

Has anyone read about o-ring failure? and what psi they were running before it happend?

dikkstarr · 02-06-2011, 10:44 PM

Quote:

Originally Posted by mwilbur516

Normal driving I'm at 70psi and at WOT the lowest I've seen is about 63psi. I think I'm gonna leave it. Now had it been 75-80psi I would've pulled the spring and trimmed it a little.

Mines at about 69-70psi normal driving and wont go below 65-66psi at WOT, but mines is not tuned right now.

When my glow plugs are on Im at 60-61. Have you noticed that?

SickStroke6.0 · 02-06-2011, 10:48 PM

The Ford specs for fuel pressure is 45 minimum, 75 maximum. Not 70. 72 is perfect, IMO.

You guys are thinking about International's spec, which is 70 max.