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post #1 of 10 (permalink) Old 06-20-2008, 03:45 AM Thread Starter
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boost gauge vs map read out?

I was comparing my boost gauge vs the boost read out on the TS heads up display. The TS reads electronically from the map signal. The map is on a regulator and maxes out at 26 psi. I had to play with the regulator to get the max without setting a SES lamp. There is a substantial difference up to that point vs my mechanical boost gauge. At 26 psi on the TS the boost gauge only shows 20 psi. Anyone else see this much of a difference? Maybe a problem with the gauge? If thats the case my max boost of 43psi may be quite a bit higher.

Kevin

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post #2 of 10 (permalink) Old 06-20-2008, 04:34 AM
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Re: boost gauge vs map read out?

Where are you taking the readings?

It's not as simple as the Map is hooked to the manifold and the boost gauge is hooked to the compressor housing or something is it?

Other than that, what does the Map read at idle?
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post #3 of 10 (permalink) Old 06-20-2008, 04:37 AM
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Re: boost gauge vs map read out?

I have also noticed a difference between my attitude monitor and my boost gauge.
its usualy about 5 psi off, my max boost is 25 psi (boost gauge) and the attitude monitor never goes over 19.8 -20.2, I guess the map sensor is to slow because if I keep my foot in it long enough the attitude monitor will start to catch up to the boost gauge, but I trust the gauge more.

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post #4 of 10 (permalink) Old 06-20-2008, 02:25 PM Thread Starter
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Re: boost gauge vs map read out?

Charles both are connected at the manifold. The boost gauge is mechanical and the TS heads up display gets its electrical signal from the map. The map boost signal is higher than the mechanical gauge. That is up to 26psi where the map is regulated to. At 26 psi at the map the boost gauge only shows 20 psi. I'm going to try a different mechanical gauge and check all the fittings.

Kevin

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post #5 of 10 (permalink) Old 06-20-2008, 04:29 PM
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Re: boost gauge vs map read out?

Kevin, you can also get an aftermarket MAP sensor that can read the pressure without having any control function. I think they make up to a 4 bar sensor.

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post #6 of 10 (permalink) Old 06-20-2008, 07:20 PM
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Re: boost gauge vs map read out?

If he lets his Map sensor read that high his PCM will tell him to get screwed.
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post #7 of 10 (permalink) Old 06-20-2008, 07:38 PM Thread Starter
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Re: boost gauge vs map read out?

I kept backing it down untill it didn't set a SES lamp. It's been at 26 for a long time. I think he's talking about a stand alone to get the TS to read full boost.

Kevin

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post #8 of 10 (permalink) Old 06-20-2008, 07:59 PM
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Re: boost gauge vs map read out?

Ahh, yeah. But at some point having a trustworthy boost gauge for the pillar shouldn't sound like crazy talk.
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post #9 of 10 (permalink) Old 06-20-2008, 10:59 PM
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Re: boost gauge vs map read out?

off topic- how do you like the heads up display?

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post #10 of 10 (permalink) Old 06-21-2008, 01:52 AM Thread Starter
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Re: boost gauge vs map read out?

I like it. The recall is the main reason I got it. It was the easiest way for proof of rpm.

Kevin

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