Boost Gauge
Senior User
Joined: Jun 2006
Posts: 436
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From: The Dalles Oregon
well I say cold is better because its giving you a reading right before it goes in to the motor so its more accurate to what the motor is seeing, if done on the hot side it could read a little higher but becaue of pressure drop across the intercooler its not actually what the motor is getting.... but all that is just my oppinion 
Last edited by Badluck; Sep 6, 2007 at 04:55 PM.
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Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
At the same time, though, on the hot side, you're actually seeing what level of boost is being generated by the turbo itself.
I'll show my ignorance on this issue one more time and ask... where is the MAP sensor getting its boost measurement from - hot or cold side?
I'll show my ignorance on this issue one more time and ask... where is the MAP sensor getting its boost measurement from - hot or cold side?
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Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
Here's a thought. Why not use a little 12v solenoid valve, make connections to both sides, and have a little flip switch in the cabunder the gauge with one position labeled HOT and the other COLD, then you can switch between the two sides and run/monitor either one you want. Could even be a decent troubleshooting tool to see if there is a boost leak between the two sides around the intercooler boots.
EDIT: I've just atlked myself into it. I know I can get a small 1/8th inch Parker 12v solenoid for about $60-$70, which is about the same as a second gauge, but will only have to have the one gauge instead of two in the cab.
EDIT: I've just atlked myself into it. I know I can get a small 1/8th inch Parker 12v solenoid for about $60-$70, which is about the same as a second gauge, but will only have to have the one gauge instead of two in the cab.
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
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From: Concord NC
Elder User
Joined: Mar 2003
Posts: 699
Likes: 0
From: northern Michigan
Got to Http://www.dieselmanor.com
Click on install sheets.
They have real good color photos of hooking into the MAPP sensor line. Requires a tee fitting with the pressure line adaptor, couple of hose clamps, nut driver and a jackknife.
Click on install sheets.
They have real good color photos of hooking into the MAPP sensor line. Requires a tee fitting with the pressure line adaptor, couple of hose clamps, nut driver and a jackknife.
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Ernest please don't hijack this thread, however Jody Tipton mentioned a small benefit in response by moving the MAP line to the hot side. I used the exisiting MAP elbow-nipple for my boost-reference on the fuel pressure regulator, and i drilled and tapped two holes in the hot side compressor manifold. My gauge JUMPS from 5 to 25psi as fast as it takes to move from idle to 5psi. Maybe thats a combination of my fueling, tuning and turbo but i never saw that happen before. Jury is out (you too ernest 
) on if it increases performance but it just puts my mind at ease.
) on if it increases performance but it just puts my mind at ease.