Boost Presure Durametric 1.2 BAR

[fdorn]

I was messing around yesterday with a Durametric to see if I could translate the value it logs as Boost Pressure to the BAR reading on my dash.

In doing so, I recorder through Durametric and saw on my dash a reading of 1.2 BAR. Never saw that before (not even a spike). My sustained boost seems to be .7 to .8 which I believe is normal on a stock 996. I am just wondering if this type of spike is normal, can it do damage, does it have anything to do with 80 degree temps.

Car has 57k miles, new plugs and new MAF. Completely stock. Running better than it ever has....

I wish it never happened because now I have to flash the car...totally addicting.

Edited May 21, 2009 by fdorn

[fdorn]

I did get a great explanation for this is case anyone is interested....

<<

The 996tt DV's are controlled by a vacuum solenoid thats cycled by the ecu. At high rev's, when you let off the gas quickly, the throttle plate will actually beat the ecu to open the DV's.

This will cause a boost "spike" on the dash that will never reach beyond the throttle plate.

Tony EPL>>

I was messing around yesterday with a Durametric to see if I could translate the value it logs as Boost Pressure to the BAR reading on my dash.

In doing so, I recorder through Durametric and saw on my dash a reading of 1.2 BAR. Never saw that before (not even a spike). My sustained boost seems to be .7 to .8 which I believe is normal on a stock 996. I am just wondering if this type of spike is normal, can it do damage, does it have anything to do with 80 degree temps.

Car has 57k miles, new plugs and new MAF. Completely stock. Running better than it ever has....

Edited May 22, 2009 by fdorn

[jpflip]

Interesting. Thanks for sharing. I too start studying Durametric. It is a fine tool but there was too many functions and terms unknown to me. It will take me a while before I can handle this tool properly other than just erasing messages....

[fdorn]

Interesting. Thanks for sharing. I too start studying Durametric. It is a fine tool but there was too many functions and terms unknown to me. It will take me a while before I can handle this tool properly other than just erasing messages....

The Durametric is all about Actual Values and you need the mathmatical equations to get the answers that make sence.

For example..Boost Presure (I think anyway)

"Boost pressure of sensor" is an Actual Value in the Durametric and it is displayed in mbar. In my car, at idle it is 990 (this number will vary depending on how high above sea level you are - I think). The standard atmosphere (symbol: atm) is a unit of pressure and is defined as being equal 14.696 PSI, 1013.25 mbars (at sea level). 0 Bar reading in the car is actually equal to 14.696 PSI or 1.013 BAR (at sea level) so the gauge is a measurement above atm (the Durametric is a total reading). 1.0 BAR reading in the car is an additional 14.696 psi or 1 additional bar of boost pressure.

Under acceleration, if I record a reading of 1569 through the Durametric it needs to be converted to match the reading on the gauge in the car.

1568 - 990 (reading at idle) = 578 mbar / 1000 = .57 BAR or .6 bar on the gauge or 8.5 psi

I might buy Auterra Dyno Scan (even if it is a POS). It will display Boost Presure in both bar and psi.

Here is the Manual that has definitions starting on Page 50 (no idea how they map to Durametric):

http://lib.store.yahoo.net/lib/auter...dowsManual.pdf

Both PC software and Dash mount

http://www.auterraweb.com/dashdyno.html

Web site

http://www.auterraweb.com/

Parameter list (without definitions I believe)

http://www.auterraweb.com/paramlist.html

Demo version

http://lib.store.yahoo.net/lib/auter...wsSoftware.zip

If anyone knows that this is a POS let me know before I waste my time with it.