low boost on modded 7.3 - Ford Powerstroke Diesel Forum

 
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post #1 of 8 Old 10-09-2012, 05:12 PM Thread Starter
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Thumbs down low boost on modded 7.3

i have a 2000 f350 and at WOT the most boost i can hit is 16lbs. the truck has a 4 inch downpipe into a 4 inch straight pipe exhaust out the side. a k&n air intake and a TS 6 position chip. i also checked and have no boost leaks. fuel pressure is 65lbs and at wot it drops to 60lbs. any ideas?
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post #2 of 8 Old 10-09-2012, 05:36 PM
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up pipes leaking?

2002 F-250 XLT 4x4 offroad extended cab short bed
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post #3 of 8 Old 10-09-2012, 08:02 PM
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^^^ what he said. Also, maybe the chip isnt installed correctly/making contact and/or the contacts not cleaned good enough. Fuel pressure is normal, withthe 5psi drop at wot.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #4 of 8 Old 10-10-2012, 04:38 PM
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Any updates?

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post #5 of 8 Old 10-11-2012, 01:29 PM Thread Starter
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i checked out the up pipes and they dont look like they are leaking theres no soot on the firewall or anywhere on the piping. is there any other way to check them other than just looking at them?.
another thing i noticed is that with my ts chip in stock mode i get 10lbs in 50hp-14lbs. 75hp-14lbs. 100hp-16lbs and 140+ i get 16lbs while rolling a huge smoke cloud.

seems like from the 50hp mode to the 140+ extreme it doesnt change much, does that seem right?
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post #6 of 8 Old 10-11-2012, 02:02 PM
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no. You should be in the 20+ psi. I'm having similar issues, with redline unhooked, the best i see (stock truck, no chip-tuner) is 15psi. I went ahead and did the 10k mod, and with redline unhooked, hit 22psi. So, i ordered up a ICP. Should be here today, and if install makes it, i'll re-post my findings.

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post #7 of 8 Old 10-11-2012, 05:14 PM Thread Starter
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im ready to do whatever it takes to get more boost id like to push the turbo to its limit
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post #8 of 8 Old 10-11-2012, 05:24 PM
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Quote:
Originally Posted by superstroke powerduty View Post
i also checked and have no boost leaks.
How'd you check for boost leaks? Pressurized the charge air system?

Quote:
Originally Posted by superstroke powerduty View Post
another thing i noticed is that with my ts chip in stock mode i get 10lbs in 50hp-14lbs. 75hp-14lbs. 100hp-16lbs and 140+ i get 16lbs while rolling a huge smoke cloud.

seems like from the 50hp mode to the 140+ extreme it doesnt change much, does that seem right?
You're possibly maxing out your HPOP.
The "+140" makes so much smoke because it's dumping too much fuel and not enough air.

Quote:
Originally Posted by superstroke powerduty View Post
im ready to do whatever it takes to get more boost id like to push the turbo to its limit
Get some custom tunes if you wanna get there.
If you wanna do whatever it takes, get something to monitor live data. Monitor MAP to make sure it's correct, ICP, IPR, EBP to name a few. Those sensors have been known to cause driveablilty issues.

But personally, I'd bet that you have a boost leak.



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