[Kerry]

So its supposed to put the 1 bar out of the manifold to read the boro. Have the 3 bar in the manifold. But the one bar does nothing. unplug it and no change in the reading. Unplug the 3 bar and it changes the baro reading. So i dont understand.
The problem is the baro keeps changeing. Normal start up here is 14.1 but in a short time it goes to 15.9. I know thats not right.

I just got the nguage and when it reads boost the boro goes down. Starts at the same 14.1 or so and as boost comes up the bro drops as far as 12.5. Again not right. What gives and what am I doing wrong? Do I have a bad harness? I can only find 3 different boro places to log in hp tuners and none make any difference

[Juiced1]

That 1 bar is only for the Pratio. Any other baro reading is going to be the main map sensor. Since technically that map sensor is actually part of the maf.

[Kerry]

Ok let me ask this. When logging runs does the baromtric pressor move? Mind does like over 2 points sometimes. just wondering if I have a problem?

[Joshinator99]

Originally Posted by Kerry

Ok let me ask this. When logging runs does the baromtric pressor move? Mind does like over 2 points sometimes. just wondering if I have a problem?

So, what do you have for a setup? On a PD blower, the MAF reads the baro as Juiced alluded to and it works fine. But on a centri setup, if the MAF is pressurized then your Baro readings are incorrect and screws up your P-Ratio. I’m assuming you used a breakout harness to take the baro reading away from the MAF. It shouldn’t be changing 2 full points under boost IMO.

[Kerry]

Yes its a procharger,with the breakout. It will read 14.1 at start up. Thats normal for here. Then as the car gets warm it just out of no where jumps to like 15.9. Then as boost comes on it will drop. If its 14.1 it can drop to 12.5 if its reading 15.9 it might drop to 14. Makes no sense to me. Why would it move and does other cars do this or do I have a problem?

[Kerry]

Car seems to run fine. afr stays about the same but it does jump around alot.

[Kerry]

Boost is measured from the boro reading correct?

[Joshinator99]

Originally Posted by Kerry

Boost is measured from the boro reading correct?

Partially. Boost is from MAP (Manifold Absolute Pressure) minus baro reading. Baro is your outside barometric pressure and the only way it changes is based on weather and altitude.

So, for example, if your MAP is 28.5 and your baro is 14.1, then you’re making 14.4 psi boost.

[Kerry]

Originally Posted by Joshinator99

Partially. Boost is from MAP (Manifold Absolute Pressure) minus baro reading. Baro is your outside barometric pressure and the only way it changes is based on weather and altitude.

So, for example, if your MAP is 28.5 and your baro is 14.1, then you’re making 14.4 psi boost.

Thats what I thought so when the boro is moving around a couple psi then the reading is incorrect. Seems like it would change the afr, I gues cause its maf only so thats keeping the afr in ck

[wnta1ss]

Originally Posted by Kerry

So its supposed to put the 1 bar out of the manifold to read the boro. Have the 3 bar in the manifold. But the one bar does nothing. unplug it and no change in the reading. Unplug the 3 bar and it changes the baro reading. So i dont understand.
The problem is the baro keeps changeing. Normal start up here is 14.1 but in a short time it goes to 15.9. I know thats not right.

I just got the nguage and when it reads boost the boro goes down. Starts at the same 14.1 or so and as boost comes up the bro drops as far as 12.5. Again not right. What gives and what am I doing wrong? Do I have a bad harness? I can only find 3 different boro places to log in hp tuners and none make any difference

Have to suspect a problem with your harness or sensor, no change from unplugging the sensor is a red flag. The baro reading should stay steady with that kit, that's the whole purpose of it, to ignore the bad baro readings that come from the MAF when it's downstream of the compressor. I had the baro breakout with a centrifugal supercharger, checked a log and the baro reading was steady at 14.5 (low altitude track). Illustration below, notice how the baro reading is steady despite differing throttle, rpm, and manifold pressure points.

[Kerry]

Originally Posted by wnta1ss

Have to suspect a problem with your harness or sensor, no change from unplugging the sensor is a red flag. The baro reading should stay steady with that kit, that's the whole purpose of it, to ignore the bad baro readings that come from the MAF when it's downstream of the compressor. I had the baro breakout with a centrifugal supercharger, checked a log and the baro reading was steady at 14.5 (low altitude track). Illustration below, notice how the baro reading is steady despite differing throttle, rpm, and manifold pressure points.

Attachment 1050246

Thank you so much for your reply. I emailed dsx and they looked at my tune and the map sensor was set to na-map but should have been set to na-tiap. Works like a champ now. Thanks!!! when I unplug the 1 bar it reads 0 now. Plug it back in and reads 14.5 da is really good right now.