No boost? - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 12-16-2007, 10:12 AM Thread Starter
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No boost?

Hey guys I just installed my boost & pyro guage this weekend. I took'r for a test drive and noticed I'm not building ANY boost until around 1.5-2k/rpm. At 3k/rpm I'm only boosting around 8-10psi.

My exhaust is cutoff about 12in. past the downpipe. Could the lack of back pressure have any effects?

I hear a ticking around the driver's side when I put the engine under a load. Could the exhaust leak effect my boost this much?

Neither of the intake boots appear to be dry-rotted but I haven't ruled them out.

Anyone clue me in as to what is normal and when I should be boosting x/psi @ y/rpm's?


Thanks guys!

~Bo


94.5 F-350 Dually
7.3L 5spd
Grand Rock 6" Aussie's
D.I.Y. Stage 1 Injectors
Tony Wildman 6pos Chip
Optix Guages (boost & EGT)
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post #2 of 5 Old 12-17-2007, 04:06 PM Thread Starter
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~Bo


94.5 F-350 Dually
7.3L 5spd
Grand Rock 6" Aussie's
D.I.Y. Stage 1 Injectors
Tony Wildman 6pos Chip
Optix Guages (boost & EGT)
DIY Tymar, CCV mod, FPR Shim
Tommy-Lift: so I can date fat chicks

I don't smoke cigars, I smoke pipes!
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post #3 of 5 Old 12-17-2007, 04:27 PM
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my guess is you pinched the boost line? i would start by tracing from the gauge to the fitting where its connected. if its pinched u can get a whole new line with fittings for about 6$ at a napa or autozone or store like that, or u can buy compression fittings for about a buck. This happend to my truck and my buddys cummins. so check the line and hopefully thats what it is.
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post #4 of 5 Old 12-17-2007, 05:46 PM
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You will only see boost at higher rpm and under load. The RPM you stated seems right. If you can hit between 10 and 15 psi when you hammer on it, you should be good. You will not see much more than that until you add a chip or programmer.

The lack of backpressure, in my experiences, causes the turbo to take longer to spool. The OBS trucks are so under powered and have such a large turbine housing, the backpressure actually helps on the bottom end. When you add a chip, the extra fuel will overcome the need for backpressure. I saw a 200 RPM decrease in spool up on my truck by when I went to straight pipe.

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Last edited by pipelayerjdh; 12-17-2007 at 05:52 PM.
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post #5 of 5 Old 12-18-2007, 11:18 AM Thread Starter
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Thanks for the help guys! ;D

~Bo


94.5 F-350 Dually
7.3L 5spd
Grand Rock 6" Aussie's
D.I.Y. Stage 1 Injectors
Tony Wildman 6pos Chip
Optix Guages (boost & EGT)
DIY Tymar, CCV mod, FPR Shim
Tommy-Lift: so I can date fat chicks

I don't smoke cigars, I smoke pipes!
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