Stock 6.0L 2003 with 226,350 miles.
(Edit:: has arp studs and egr delete)
I have an Edge Insight CTS and the highest stored boost value was 21 until today.
Last couple of weeks I upgraded to the blue spring and replaced all the o-rings and the face plate.
Today I drove it on the highway for work and really opened it up. Boy it takes off now, most noticeable flooring it and going from 55mph up to 70+ ... like when passing. And when I stomp on it around 70mph and it drops a gear I love it!!!
So I checked the boost recorded value and it shows 25. I then put boost back as one of the values displayed and sure enough ... I can get it up to 22, 23, 24.
Did the spring upgrade do this?

The full list of stuff I did as well as the spring is:
Replaced the fuel filters and drained the fuel/water seperator .. usual schedule and International filters.
New oil and filter - switched to 5w-40 in prep for winter coming.
I removed and tested both batteries.
To clean the engine I also removed both battery trays, air filter, the FICM and bracket, degas bottle, both CAC tubes, fan shroud and grille.
After protecting the harness ends, pcm and alternator, etc I then sprayed the engine with degreaser and water. I cleaned the radiator. I cleaned the removed parts and battery terminals then reinstalled everything, with terminal protectant on the batteries.
New leaf springs and shocks on the rear, left and right.
4 new brake calipers, brackets, rotors and pads.
New brake fluid. Power steering flush and new magnafine filter.
(Also took a claybar and polish to the whole truck )

FICM always showed 47 - 48.5 on start or when running ... and it still does. I do not have a fuel pressure gauge and all injectors are original.

So why the increase? Any ideas? I hope it's a good thing.

 

Sounds like you've been suffering from low fuel pressure for a while.......

It takes fuel to make boost, so yes, it could very well have increased your boost.

 

shure The blue spring could cause more boost if you were low fuel pressure before more fuel to burn now

The more exhaust gas the Harder the turbo can spin

It also could be a high pressure day where ur at

what kinda boost gauge do you have does it come from Edge

 

My boost gauge is the one on the edge insight from the obd-II connector.

I was figuring it must be related but didn't think it was that simple.
I jumped to the conclusion that this must be more involved. It is a 6.0 after all

If it isn't weather related, was my 21 boost a low value and 25 puts me back at typical ... or is 21 ok and 25 is now really good?
I am still on original injectors so maybe it wasn't that bad?

 

Boost

21Psi is Low Good
25Psi is Average Better

And IIRC maybe 28 psi and diffinatly 30+ psi is overboost

Your Boost numbers are just fine

Boost when caculated thru obdII is a calculation from the Map sensor

Map & Baro & Ebp should be the same at KOEO to verify your gauges and the sensors

 

Thanks Benny

I'm going to drive it and enjoy it!!

p.s. I recommend the clay bar process to all. It's like a new truck off the lot. Run your hand across the surface and it's like clean glass or tile. Well worth the effort.



She has a little funny stance at the rear cause she's on a bank and the bed is full of debris from a jobsite.

 

I think the increase in boost is directly attributed to the clean and polish! Yeah... less wind resistance!!

Heh, heh! With all of those things you did, I am sure your truck is showing its appreciation for your diligence!

Eric

 

Thanks Eric.

Hello also to a fellow NH member. I'm in Francestown, which isn't far from Unique Ford that's in your pic. Flash the lights or stop and say hi if you see me around. I'll be in the shiney truck

Sometimes I have thule ladder racks and a ladder on her and I fill up at the Shell or Irvings on 114.

 

I will, but I actually live not far from the Seacoast, Brentwood to be specific. I spent the better part of 6 months trying to find the right truck, at the right price, with the right mileage. Unique happened to have it. It was worth the 45 minute drive!

I will be doing the Blue Spring upgrade and a coolant filter here, very soon. Good luck!

Eric