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Advanced Discussion - 7.3L Powerstroke Performance Advanced topics related to the 7.3L Power Stroke Engine

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Old 04-07-2009, 05:05 PM
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CSIPSD CSIPSD is offline
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Default A little reroute of the MAP sensor tubing...

I have heard this from a few different sources, that by moving the Map line to the hot side of the IC you will gain a bit in throttle response... I thought it made perfect since, I build boost faster on that side as well as higher numbers. So last night I rerouted it over there.

Just some quick drives from the hotel to the jobsite. It works!

Might try it out if you have the ability...

My only concern is how well the MAP sensor will take to the 300-400 degree air temps that might get seen there...
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Old 04-07-2009, 11:14 PM
old man dave old man dave is offline
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That was posted on TDS awhile back. The theory is that the pressure on the hot side is higher so the pressure ramps up at a higher rate than the cool side. The MAP response also ramps up at the faster rate when hooked to the hot side. It works, too. Did it a long time ago. Temperature should not be a problem, the OBS MAP pressure tap point is the intake plenum and does not have an intercooler. The air column in the hose doesn't move anyway so there is little or no heat flow.
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Old 04-07-2009, 11:48 PM
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Mine has been tapped there for 4 years. No MAP problems yet.
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Old 04-08-2009, 11:35 AM
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also joe any hot air movment would go into your gauge line in the middle there im going to move mine this week
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Old 04-08-2009, 11:53 AM
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My GT42 has an 1/8 port in the compressor housing. Could I tap boost pressure from there or does it need to be after it leaves the compressor housing?
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Old 04-08-2009, 04:46 PM
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That would work Gordon... I have heard on a few other forums that the OBS have there's on the hot side, I didnt even think about that last night. So the heat is a none issue.
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Old 04-08-2009, 05:32 PM
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I did mine on the hot side a while back. Did notice a SOTP increase in throttle response on the low end.

MAP line on left, boost gauge on right:

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Old 09-15-2010, 09:24 PM
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Huh wow might have to try this out
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Old 09-15-2010, 10:14 PM
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does seem to be a good idea.
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Old 09-15-2010, 10:26 PM
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obs is in the hot side, right off the Y-pipe.
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