What is the most boost you have logged with ST?

TurboQueef · 05-13-2006, 12:50 PM

Seems like a silly question but...

I have been tinkering with wastgate duty cycles again. I have noticed a few pulls hit 20psi according to my Omori boost gauge but when I check the log it only shows 18.42. As a matter of fact, I have never seen the boost over 18.42 in a data log even though the Omori shows it higher.

Any ideas?

Thanks,

Jeff B

Muffnbluff · 05-13-2006, 12:52 PM

Quote:

Originally Posted by TurboQueef

Seems like a silly question but...

I have been tinkering with wastgate duty cycles again. I have noticed a few pulls hit 20psi according to my Omori boost gauge but when I check the log it only shows 18.42. As a matter of fact, I have never seen the boost over 18.42 in a data log even though the Omori shows it higher.

Any ideas?

Thanks,

Jeff B

I think the ecu can only read that high, so if you did actually go over ~18.42 the ecu would only show that number.

jays05 · 05-13-2006, 06:07 PM

36.69 absolute.

TurboQueef · 05-13-2006, 06:26 PM

Quote:

Originally Posted by jaygoesfast

36.69 absolute.

??????

Dr. Gonzo · 05-13-2006, 06:30 PM

Quote:

Originally Posted by Muffnbluff

I think the ecu can only read that high, so if you did actually go over ~18.42 the ecu would only show that number.

What he said: try a search over at wrxforum.com I remeber christian (cobb guy) talking about it once. The short of it, the ecu only recognizes ~18.3 psi

***Datadatum*** · 05-13-2006, 06:31 PM

Subtract 14.7 atmostpheric pressure from 36.7 psia, and you'll get 22 psig.

The most I've logged on my UTEC is 20 psig. (It was a snap cold spell, and I was still running my warm weather map.)

jays05 · 05-13-2006, 07:05 PM

I think 36.69 is the max reading on the MAP sensor - it sure looks like it from my datalogs.

WolfPlayer · 05-14-2006, 10:48 AM

Log Atmospheric Pressure and Absolute pressure. I stopped logging relative pressure a long time ago. Open up the log in Excel and subtract the atmospheric pressure from the absolute pressure. There ya go.

t

TurboQueef · 05-14-2006, 04:11 PM

Quote:

Originally Posted by WolfPlayer

Log Atmospheric Pressure and Absolute pressure. I stopped logging relative pressure a long time ago. Open up the log in Excel and subtract the atmospheric pressure from the absolute pressure. There ya go.

t

Cool, that is the ticket.. thanks

overdose · 05-14-2006, 10:41 PM

Quote:

Originally Posted by TurboQueef

Cool, that is the ticket.. thanks

Yup, absolute-relative = real boost, just use the sum function in excel to make a corrected column

sidenote i just installed a big tmic so i'm gonna be goin for 22psi on pump gas :P

05-13-2006, 12:50 PM	#1
TurboQueef Silver Member Car: 2005 STI Fav Mod: Shawn's brain Location: Southwest Michigan Posts: 390 Join Date: Aug 2004 Trader Rating: (0)	What is the most boost you have logged with ST? Seems like a silly question but... I have been tinkering with wastgate duty cycles again. I have noticed a few pulls hit 20psi according to my Omori boost gauge but when I check the log it only shows 18.42. As a matter of fact, I have never seen the boost over 18.42 in a data log even though the Omori shows it higher. Any ideas? Thanks, Jeff B This ad is not endorsed by this member. Please register or login to hide this ad.

05-13-2006, 06:07 PM	#3
jays05 Spec C Club Fav Mod: when it's not blown up Location: Upstate NY Posts: 1,569 Join Date: Nov 2004 Trader Rating: (0)	36.69 absolute.

05-13-2006, 06:31 PM	#6
*Datadatum* 100% More Wingless Car: 05 STi + 08 OBXT Fav Mod: baby seats Location: Jacksonville, FL Posts: 5,530 Join Date: May 2004 Trader Rating: (0)	Subtract 14.7 atmostpheric pressure from 36.7 psia, and you'll get 22 psig. The most I've logged on my UTEC is 20 psig. (It was a snap cold spell, and I was still running my warm weather map.)

05-13-2006, 07:05 PM	#7
jays05 Spec C Club Fav Mod: when it's not blown up Location: Upstate NY Posts: 1,569 Join Date: Nov 2004 Trader Rating: (0)	I think 36.69 is the max reading on the MAP sensor - it sure looks like it from my datalogs.

05-14-2006, 10:48 AM	#8
WolfPlayer Moderator & ECU Tech Car: 05 CGM STI Fav Mod: mo boostaz Location: Fredneck, MD Posts: 3,622 Join Date: Jun 2004 Trader Rating: (6)	Log Atmospheric Pressure and Absolute pressure. I stopped logging relative pressure a long time ago. Open up the log in Excel and subtract the atmospheric pressure from the absolute pressure. There ya go. t