Strange boost reading...

[hsk8te2006]

Hi,

I recently installed my prosport premium electronic boost and oil temp gauges. I seem to be pulling up to 14psi of boost, but I do not have a boost controller on my car yet. I haven't even removed my WGS restrictor yet either. I tapped the vacuum line that comes off the front driver's side of the intake manifold.

Any ideas why this would happen?

Thanks,
Jonathan

 

[GILZTSIAWD]

Gauges are usually off by a few psi. You need a map sensor to log to know if it is really running that much boost.

 

[hsk8te2006]

map sensor? what is that abbreviation for?

 

[GILZTSIAWD]

telling you the abbreviation wont help any, manifold absolute pressure aka mdp or manifold differential pressure. Its a way to accurately read boost. Is it spiking to 14 then coming down or holding 14?

 

[CanadianTSi]

14psi is normal for your mods...

 

[hsk8te2006]

Holding at 14psi.. it even spiked to 15 once when the engine was cold.

What mods that I have will raise the boost to 14 psi from teh normal stock 12?

 

[rich3389]

I was getting 14 psi with just an open air filter, thats perfectly normal.

 

[CanadianTSi]

What mods that I have will raise the boost to 14 psi from teh normal stock 12?

The 1G BOV is holding boost where the stock 2G would leak...

 

[hsk8te2006]

Ok... it seems that when it is cold, it will actually spike up as high as 16.5 psi, but once it warms up it wo't go over 14.

I recognize that the 1g bov can hold mroe boost than the 2g, but from teh reading I have done, I thought that the wastegate would open at 12 psi and prevent the boost from raising higher than 12 psi. Is that not how it is supposed to function?

Thanks,
Jonathan

 

[hsk8te2006]

Hi...

-New development:
On a drive back from Boston today, there were several occasions when I floored the car (in 5th gear), it immediately spiked up to 20psi and held, and I hit fuel cut. It was spiking up to between 16 or 19 psi (an dheld there) the majority of the time i floored it, but not all of the time. A few times it only spiked to 15 and then lowered back to the normal 13psi.

Whenever it ran over 15psi, the car seemed to hesitate a little or otherwise accelerate a little off from normal... (hard to explain...). I'm guessign I was running lean at that point... no way to know for sure.

I have no boost controller. My profile mods list is accurate (BCS Restrictor removal is the only boost control system mod). I was not logging during the drive.

Anyone know what would cause these symptoms?

Thanks,
Jonathan