Map sensor line leak?
#1
Elite Member
Thread Starter
iTrader: (11)
Join Date: Apr 2008
Location: Texas, 'Murica
Posts: 2,497
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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?
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 12:34 AM.
#3
Boost Pope
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/smod.png)
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,339
Total Cats: 6,793
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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.
I'm betting you've got a discrep between your MAP sensor calibration and the actual MAP sensor on the MS.
#4
Elite Member
Thread Starter
iTrader: (11)
Join Date: Apr 2008
Location: Texas, 'Murica
Posts: 2,497
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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.
#6
Elite Member
Thread Starter
iTrader: (11)
Join Date: Apr 2008
Location: Texas, 'Murica
Posts: 2,497
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
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.
![](http://carphotos.cardomain.com/ride_images/4/325/2401/38311200012_medium.jpg)
![](http://carphotos.cardomain.com/ride_images/4/325/2401/38311200013_medium.jpg)
I the problem should be resolved if i rescale it correctly. What do you think?
![](http://carphotos.cardomain.com/ride_images/4/325/2401/38311200012_medium.jpg)
![](http://carphotos.cardomain.com/ride_images/4/325/2401/38311200013_medium.jpg)
I the problem should be resolved if i rescale it correctly. What do you think?
Thread
Thread Starter
Forum
Replies
Last Post
Zaphod
MEGAsquirt
47
10-26-2018 11:00 PM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM