Bouncing Boost Gauge - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 12-05-2007, 06:28 PM Thread Starter
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Bouncing Boost Gauge

First I should start of by saying hello and great forum, seeing as I am a new guy. I have been around Turbo vehicles for years now, everything from turbocharged snowmobiles, to cars (Subaru WRX). But now have made my way into the diesel community. The lack of a throttle body like gassers still baffles me a little?

SO HERE IS MY QUESTION: 1995 F250 7.3, I just installed a standard Autometer mechanical boost gauge on the steering collum. WOT I hit stock target boost of around 19psi I think, but the needle is bouncing or twitching +and- about a psi I can barely read it!!! My line is tapped into the MAP sensor line that runs from the right manifold to the MAP mounted in the firewall. Is there a more stable boost source to view?
I have searched but havent found an answer in old posts, but I am sure someone has adressed this before and how to correct it, becuase its rather anoying!!
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post #2 of 10 Old 12-05-2007, 06:46 PM
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thats where yer suppose to put it... by the way welcome to the org and im not sure why its doing that but some one will be along here shortly im sure too help ya out..

1996 dodge 3500
the new toy
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post #3 of 10 Old 12-05-2007, 06:49 PM
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sounds like turbo surge to me...... mine does that at WOT all the time... only real cure is a new housing or a whole new turbo
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post #4 of 10 Old 12-05-2007, 07:10 PM Thread Starter
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Yes the bouncing does get worse the higher the boost, the needle is fairly steady when running a steady RPM. I didnt know if it had something to do with the manifold design, and the cylinders gulping large amounts of air was creating the fluctuation.
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post #5 of 10 Old 12-06-2007, 04:36 PM
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Mine does the same thing

The new Truck
2005 F350 4x4 CC, DRW, LB, Auto
106000 miles, King Ranch Edition,
5 inch duals, sct tuner

My old Truck that I still have
1997 F-250 4x4 EC, SRW, LB, 5 Speed,
246000 miles, k&n cold air intake, 3 inchdown pipe,
5 inch daul silverline stacks, DP Tuner F5 6 position chip, Shimed FPR




October 2008 Rig Of The Month WINNER

[/CENTER]
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post #6 of 10 Old 12-07-2007, 06:49 AM
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It's normal, as long as it's only 1psi either way you really don't have anything to worry about.

Duane

1994.5 F-350, PSD, 5spd, Crew cab, 2wd, DRW
10k mod
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post #7 of 10 Old 12-07-2007, 07:09 AM
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typical turbo surge, all 7.3's do it, especially with a chip

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post #8 of 10 Old 12-07-2007, 07:42 AM
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mine does it too, is there a way to get rid of the bounce? Someone mentioned something about a new housing?


1996 Ford F350 Regular Cab 5spd with the 7.3L PSD, 4x4, 35.5x12.5x16.5 All-Terrain T/A's, 3.73s', DIY Electric Reg Return Fuel Sys, 3" Downpipe, AFE Stg 2, 17* HPOP, IDM Mod, SB Con-O, Cat and Muffler Delete, AutoMeter NV Series Boost, Fuel Press. and Pyro, Autometer 3 Pod A-Pillar, TS Performance 6 Pos Chip. HPX Mod, 335,000 Miles
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post #9 of 10 Old 12-07-2007, 07:52 AM
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well you can:

1. Get an ats housing for your turbo - fun
2. Get a new turbo - funnerer

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post #10 of 10 Old 12-07-2007, 09:29 AM
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whats the difference between the ats housing and the stock one?


1996 Ford F350 Regular Cab 5spd with the 7.3L PSD, 4x4, 35.5x12.5x16.5 All-Terrain T/A's, 3.73s', DIY Electric Reg Return Fuel Sys, 3" Downpipe, AFE Stg 2, 17* HPOP, IDM Mod, SB Con-O, Cat and Muffler Delete, AutoMeter NV Series Boost, Fuel Press. and Pyro, Autometer 3 Pod A-Pillar, TS Performance 6 Pos Chip. HPX Mod, 335,000 Miles
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