Highest safe boost pressure. - Ford Powerstroke Diesel Forum

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post #1 of 15 Old 09-23-2013, 08:25 AM Thread Starter
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Highest safe boost pressure.

Hey guys, particularly ones with GTP38r's.

What is the highest boost pressure you can run without wrecking anything?
Right now, i'm getting around 25-27 lbs if i push it.


2002 F350 CCLB DRW
ZF6 SWAPPED! --Southbend 1944-6OFEK
12.5in lift on 24.5's----------3" Body Lift
MBRP Dual 4"--------------Muffler Delete
K&N Intake----------------AFE Spider
Garret GTP38R BB--------- P.I.S. billet wheel
TS 6pos chip--------------NLTD tunes
P.I.S. 200cc/80%--------- P.I.S. IDM
Parrot Asteroid-------Boston Accoustic SR80's
NVX VCW 10”s------------ McIntosh MC431
Warn Manual hubs---------Bed Rails/Air tank
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post #2 of 15 Old 09-23-2013, 08:56 AM
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It says the exact same blurb on every website that sells the 38r: "Maximum recommended boost level is 40 psi"
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post #3 of 15 Old 09-23-2013, 11:10 AM
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maybe you can stretch that out a little more by adding a billet compressor wheel, but not much more than 40.

99.5 f250 7.3 4x4 258k
PHP Phoenix, S&B CAI, 4" TBE, Hpx, Stancor, RR Billet Wheel, AIH Delete, Autometer Gauges, Leveling kit, Transgo kit, Warn Hubs, Int'l Up-Pipes, RR IC Boots, Non-Ebpv Pedestal, High Flow Outlet, RR OCR, 08 Tow Mirrors.

Dad-2000 7.3 109k miles, Autometer Gauges, Superchips 1705, AIH Delete, 6637, 4" TBE, BD Billet Wheel, TruCool Max
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post #4 of 15 Old 09-23-2013, 12:02 PM
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Quote:
Originally Posted by Greenman01 View Post
It says the exact same blurb on every website that sells the 38r: "Maximum recommended boost level is 40 psi"
Hey now, Who in their right mind would waste any time looking this info up on their own!!

2000 F-250 XCLB 4x4 6 Speed, PIS 175/80's, ARP's, 910's, CNC Fuel Lines, 6637 Intake, GTP38R WW2, 4" turbo back, Hydra with Powerstruck and PHP tunes. International Up-pipes, ISSPRO Boost, EGT, HPOP and Fuel Pressure gauges. SB Clutch. MB Diesel HPOP.

Future Parts: Trac bars
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post #5 of 15 Old 09-23-2013, 12:40 PM Thread Starter
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Sorry, let me rephrase this question. What is the max safe boost pressure you can run on a 7.3 with blowing out the head gasket ect...


2002 F350 CCLB DRW
ZF6 SWAPPED! --Southbend 1944-6OFEK
12.5in lift on 24.5's----------3" Body Lift
MBRP Dual 4"--------------Muffler Delete
K&N Intake----------------AFE Spider
Garret GTP38R BB--------- P.I.S. billet wheel
TS 6pos chip--------------NLTD tunes
P.I.S. 200cc/80%--------- P.I.S. IDM
Parrot Asteroid-------Boston Accoustic SR80's
NVX VCW 10”s------------ McIntosh MC431
Warn Manual hubs---------Bed Rails/Air tank
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post #6 of 15 Old 09-23-2013, 12:58 PM
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Quote:
Originally Posted by BrodieBiking View Post
Sorry, let me rephrase this question. What is the max safe boost pressure you can run on a 7.3 with blowing out the head gasket ect...
This is a completely different question having nothing to do with any turbo.

I personally would not try to surpass 40 PSI without springs, valves and probably studs too. Honestly if i was pushing 35 PSI consistently i would do springs and valves but i like my stuff to last and i like the piece of mind. Some will say you are fine especially at 35 but going past 40 and you will want do springs, valves, and studs. Its not a must do but its a good idea.

If your only running a 38R i would not upgrade these items unless you plan on going bigger in the future.

I do not have personal experience with this but i do a lot of reading.

2000 F-250 XCLB 4x4 6 Speed, PIS 175/80's, ARP's, 910's, CNC Fuel Lines, 6637 Intake, GTP38R WW2, 4" turbo back, Hydra with Powerstruck and PHP tunes. International Up-pipes, ISSPRO Boost, EGT, HPOP and Fuel Pressure gauges. SB Clutch. MB Diesel HPOP.

Future Parts: Trac bars
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post #7 of 15 Old 09-23-2013, 01:03 PM Thread Starter
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Perfect, what I was looking for.

Thanks.


2002 F350 CCLB DRW
ZF6 SWAPPED! --Southbend 1944-6OFEK
12.5in lift on 24.5's----------3" Body Lift
MBRP Dual 4"--------------Muffler Delete
K&N Intake----------------AFE Spider
Garret GTP38R BB--------- P.I.S. billet wheel
TS 6pos chip--------------NLTD tunes
P.I.S. 200cc/80%--------- P.I.S. IDM
Parrot Asteroid-------Boston Accoustic SR80's
NVX VCW 10”s------------ McIntosh MC431
Warn Manual hubs---------Bed Rails/Air tank
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post #8 of 15 Old 09-23-2013, 01:11 PM
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Quote:
Originally Posted by BrodieBiking View Post
Perfect, what I was looking for.

Thanks.
Like your truck BTW. Not exactly what many others would build but its different. Dont think I have ever seen 24.5's on a 1 ton chassis.

2000 F-250 XCLB 4x4 6 Speed, PIS 175/80's, ARP's, 910's, CNC Fuel Lines, 6637 Intake, GTP38R WW2, 4" turbo back, Hydra with Powerstruck and PHP tunes. International Up-pipes, ISSPRO Boost, EGT, HPOP and Fuel Pressure gauges. SB Clutch. MB Diesel HPOP.

Future Parts: Trac bars
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post #9 of 15 Old 09-23-2013, 01:14 PM
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tuning plays a big role in the longevity of these motors/trucks as well.

99.5 f250 7.3 4x4 258k
PHP Phoenix, S&B CAI, 4" TBE, Hpx, Stancor, RR Billet Wheel, AIH Delete, Autometer Gauges, Leveling kit, Transgo kit, Warn Hubs, Int'l Up-Pipes, RR IC Boots, Non-Ebpv Pedestal, High Flow Outlet, RR OCR, 08 Tow Mirrors.

Dad-2000 7.3 109k miles, Autometer Gauges, Superchips 1705, AIH Delete, 6637, 4" TBE, BD Billet Wheel, TruCool Max
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post #10 of 15 Old 09-23-2013, 01:17 PM Thread Starter
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Haha, thanks. It was used as our business truck for a while, mainly because it was dock level and we could throw a couple pallets in the back. Now it's just a daily driver.


2002 F350 CCLB DRW
ZF6 SWAPPED! --Southbend 1944-6OFEK
12.5in lift on 24.5's----------3" Body Lift
MBRP Dual 4"--------------Muffler Delete
K&N Intake----------------AFE Spider
Garret GTP38R BB--------- P.I.S. billet wheel
TS 6pos chip--------------NLTD tunes
P.I.S. 200cc/80%--------- P.I.S. IDM
Parrot Asteroid-------Boston Accoustic SR80's
NVX VCW 10”s------------ McIntosh MC431
Warn Manual hubs---------Bed Rails/Air tank
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