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Old 04-19-2010, 01:16 AM   #1
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Default Map sensor line leak?

Well, I knew when I boosted my mad tyte whip yo, I would have some noob *** questions. Well, the discrepancy between the boost gauge and the MS bothers me. At 6 psi on the boost gauge the MS only reads 90-95kpa. I have adjusted the AFR's so I dont blow my car up and my timing is the super conservative ms base map. Also when at idle, the boost gauge says -17 hg and the gauge says about -10. The boost gauge on tuner studio only reads up to about 3 psi when the one in the car says 6. So, one is off, and I have a feeling that it is a vacuum leak in the line to my map sensor, being the fact that it seems to read low in boost and high in vacuum. My gauge is a cheap *** sunpro one from autozone, so my trust for it is somewhat thin.

http://www.autozone.com/autozone/cat...uestid=1419100

If anyone has ideas on what it could be besides a leaky hose let me know, thanks!


Edit: It has always bothered me it never read anywhere near 100 kpa when NA, is it the best bet to put a vacuum pump on the line going to the map sensor? I wont jack up the sensor will I?

Last edited by chicksdigmiatas; 04-19-2010 at 01:34 AM.
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Old 04-19-2010, 02:33 AM   #2
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a vac pump wont hurt anything, and with a couple tees and short sections of hose you could even hook up the MS and boost gauge to the same vac pump to test
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Old 04-19-2010, 02:41 AM   #3
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Simple (and accurate) test: what does the MS read when the engine is not running? Should be ~100 kPa.

I'm betting you've got a discrep between your MAP sensor calibration and the actual MAP sensor on the MS.
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Old 04-19-2010, 01:13 PM   #4
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Got it. When megatune was reading correctly and TS wasn't i knew it was a problem with the software set up, thats when I discovered that in TS it was set up as me having a 2.5 bar map sensor and not a 4. Now if i could only get my afr's to match. My car is actually richer than the computer says. My car is idling at 13.2 and the ts says 14.9. Off to search.
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Old 04-19-2010, 01:29 PM   #5
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stop buying the AEM Uego?
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Old 04-19-2010, 07:44 PM   #6
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Ha ha, I made this one myself, it is the JAW, I am just figuring out which wideband option to use with the MS. Thats what i get for being adventurous and making one myself i guess. I found better results if i set it to the tech edge one instead of the innovate plx. It bought it closer. However if i were to use the innovate plx 10being 0 volts, on my wideband, it is 1v for 10 afr. So i guess i just need to re scale it, here is what i have now.





I the problem should be resolved if i rescale it correctly. What do you think?
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