Too Much Boost?
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Tuned
Joined: Feb 2016
Posts: 492
Likes: 2
Too Much Boost?
Question. 2003 F350 7.3. MBRP exhaust, TS Performance 6 position chip, large air intake, 7 blade billet compressor wheel. Just installed new injector harnesses and a new IDM. Intake to turbo flange was broken so I installed an AFE Bladerunner intake. Took it for a test drive in stock chip setting and it ran great. Switched the chip to 100 and got on it. Bought ripped my head off and boost went to 30 lbs and a check engine light came on so I backed out. Drive down the road and the CEL turned off. Got on it again and same thing, way more power than I ever had in the 10 years I have owned the truck but the check engine light came on just before 30 lbs of boost?
Is this too much boost? Overboost CEL? I am gonna run codes now.
Is this too much boost? Overboost CEL? I am gonna run codes now.
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
The CEL is coming on because of the boost. The stock turbo and MAP sensors won’t last long, nor will everything else driving like that regularly. If you don’t have a OCR the PCM defuels around 23 lbs of boost. IF you’re truly hitting 30, meaning gauge is accurate, I’m guessing it drops off extremely quickly because of the defueling. If you’re running the stock TS6 tunes I’d consider buying some custom tunes and sending your chip in for installation.
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Tuned
Joined: Feb 2016
Posts: 492
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Was all stock when I bought the truck. Was towing a 32 foot 5th wheel with no problem. Traded up to a 40’ and it was screaming for more power. Added the TS chip, rebuilt/upgraded the turbo, installed a John Wood transmission, 4” exhaust, c code and x code springs and Firestone bags, and gauges for trans temp, coolant temp, EGT, and boost, and it was night and day difference. It was running about 25 lbs max. when pulling a hill or merging onto a freeway. Am very happy and not looking to change anything.
Only reason I changed the intake spyder is because I found the broken flange fixing the injector harness problem. From what I read, I wasn’t expecting to get any significant change.
Anyway, the tunes seem to be working fine. What will I gain with new tunes? What is a safe max boost and what sensor triggers the CEL? MAP sensor? Also what will fail? Engine components? Drive train?
Only reason I changed the intake spyder is because I found the broken flange fixing the injector harness problem. From what I read, I wasn’t expecting to get any significant change.
Anyway, the tunes seem to be working fine. What will I gain with new tunes? What is a safe max boost and what sensor triggers the CEL? MAP sensor? Also what will fail? Engine components? Drive train?
Thread Starter
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Tuned
Joined: Feb 2016
Posts: 492
Likes: 2
I only ran it for a few miles and was empty. Only got into it for a few seconds to make sure all the boots and clamps were going to hold and the boost went to 30 and the CEL kicked on. Don't know the exact temp but it was below 1000. I try to keep the EGT at 1200 or under when I am towing. Been a few times I was at 1300 for short periods when I needed to pas a slow truck on a climb.
I don't know that I can solely attribute the faster spooling and higher boost to the AFE intake. All the reviews buy users said it made very little difference. It's possible the injector issue was robbing power and maybe had some leaks in the turbo plumbing. Anyway, was mostly wanting to know if 30 lbs was too high and if so why, and info abut the CEL.
Done a lot more digging in the various forums and the general consensus is even if I had a stock turbo, 30 lbs shouldn't be an issue and what I need is an Overboost Code Regulator. Already have a bulletproof transmission and rebuilt rearend. Just wondering
I don't know that I can solely attribute the faster spooling and higher boost to the AFE intake. All the reviews buy users said it made very little difference. It's possible the injector issue was robbing power and maybe had some leaks in the turbo plumbing. Anyway, was mostly wanting to know if 30 lbs was too high and if so why, and info abut the CEL.
Done a lot more digging in the various forums and the general consensus is even if I had a stock turbo, 30 lbs shouldn't be an issue and what I need is an Overboost Code Regulator. Already have a bulletproof transmission and rebuilt rearend. Just wondering
Fleet Mechanic
Joined: Nov 2009
Posts: 1,381
Likes: 193
From: Cambs, England
Try posting in the 99-03 7.3 Diesel section, or perhaps admin/mod could move this?
Plenty of knowledge there. (More than mine anyway!)
Plenty of knowledge there. (More than mine anyway!)
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Laughing Gas
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Just get better tunes. No need for an OCR. Gearhead tunes around it, I'm sure others do too.
TS stands for Turd Sucker anyway.
I'd also suggest ditching that switch for a PHP Hydra tuner so you can update in the future without pulling your computer out.
TS stands for Turd Sucker anyway.
I'd also suggest ditching that switch for a PHP Hydra tuner so you can update in the future without pulling your computer out.
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Tuned
Joined: Feb 2016
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Will be ordering the boost foolermfrom Clay. Please explain what I will be gaining to offset the cost of retuning the TS or buying the Hydra? Not having an issue with the TS. Was very pleased with the difference when I installed it and I’m not having any issues. Is it just your preference or is there an issue with TS I don’t know about?
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
Will be ordering the boost foolermfrom Clay. Please explain what I will be gaining to offset the cost of retuning the TS or buying the Hydra? Not having an issue with the TS. Was very pleased with the difference when I installed it and I’m not having any issues. Is it just your preference or is there an issue with TS I don’t know about?
30 lbs boost every once in a while isn't going to destroy the turbo but for longevity don't use it when you don't need it. When I get on mine it hits 30 quickly and sets the CEL for about 90 seconds too and I'm not worried about it. It reminds me not to push it so hard.
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Tuned
Joined: Feb 2016
Posts: 492
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If you have the TS and are happy no need for the Hydra. If you ever get to the point of wanting to try different tuners then the Hydra gives you flexibility to try tunes from different tuners and upload to the chip while still in the truck.
30 lbs boost every once in a while isn't going to destroy the turbo but for longevity don't use it when you don't need it. When I get on mine it hits 30 quickly and sets the CEL for about 90 seconds too and I'm not worried about it. It reminds me not to push it so hard.
30 lbs boost every once in a while isn't going to destroy the turbo but for longevity don't use it when you don't need it. When I get on mine it hits 30 quickly and sets the CEL for about 90 seconds too and I'm not worried about it. It reminds me not to push it so hard.
FTE Leadership Emeritus
Joined: May 2014
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From: Lake Hartwell, GA
I installed an OCR when I recently installed the T4/SXE on my truck because I didn't want to be beating the hell out of the MAP sensor. 1023 does not turn off the CEL when over boosting because they want you to know where you are at with the boost levels in case you are not running an OCR or something similar.
The OCR is the right call if you are consistently going to be over boosting.