SD mode, running air > 5V of MAF sensor

hmanxx · 12-11-2007, 09:35 AM

If I were to use UTEC SD mode and knowing that the turbo will saturate the stock MAF sensor at 5V.

In this case, must I use bigger MAF housing to avoid the MAF sensor saturation ?

As in SD mode, it is MAP base, will it affect the SD mode operation once the MAF sensor saturated ?

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Import Car Center · 12-11-2007, 04:20 PM

when in sd mode, it wont matter if the maf sensor is pegged at 5v as it runs off of the map sensor. when the utec crosses into the sd threshold, the maf is only used as a air temp sensor. thats one of the great things about sd.

AaronWRX · 12-11-2007, 10:02 PM

I find that even with SD it's nice to have MAF voltage to to compare one road pull agaisnt another. A bigMAF run at 4.9v feels a lot different then a bigMAF run at 4.5v

Master2192 · 12-12-2007, 01:10 AM

Quote:

Originally Posted by AaronWRX

I find that even with SD it's nice to have MAF voltage to to compare one road pull agaisnt another. A bigMAF run at 4.9v feels a lot different then a bigMAF run at 4.5v

You'd be able to tell between the two just by looking at the boost between those runs, no need to look at a MAF sensor voltage.

Here is a UTI log of a FP Green 05 WRX maxing out the MAF sensor in SD mode. As you can tell there is no leaning out caused by MAF saturation because it is running SD

Quote:

[TSMP][RPM][PSIG][MAF][TPS][LOD][KN][SNB][SIG][IDC%][IGN][VOEF][BMV][WBO2]
003.53 5623 +23.7 4.8 97 90 0 12.0 06.0 73.2 13.6 97 340 11.50
003.57 5732 +23.7 4.8 97 90 0 12.0 06.4 72.9 13.6 97 340 11.48
003.64 5787 +23.7 4.9 97 90 0 12.0 06.6 74.0 14.0 97 340 11.45
003.73 5829 +23.3 4.7 97 90 0 12.0 07.3 73.4 14.3 97 340 11.45
003.77 5944 +23.3 4.7 97 90 0 12.0 07.2 74.1 14.1 97 340 11.45
003.84 6017 +22.9 4.8 97 90 0 12.0 07.9 77.0 15.1 97 340 11.44
003.91 6115 +22.9 4.8 97 90 0 12.0 09.2 77.6 15.2 98 340 11.39
003.97 6179 +22.9 4.9 97 90 0 12.0 09.3 76.7 15.3 97 340 11.38
004.02 6238 +23.1 4.9 97 90 0 12.0 09.1 79.6 15.4 97 340 11.38
004.13 6304 +23.1 4.9 97 90 0 12.0 09.5 79.2 15.6 97 340 11.36
004.16 6383 +23.1 4.9 97 90 0 12.0 11.7 80.1 16.2 97 340 11.36
004.22 6359 +23.1 4.9 97 90 0 12.0 11.7 81.9 16.6 97 340 11.36
004.30 6497 +22.7 4.9 97 90 0 12.0 11.6 81.8 16.7 97 340 11.31
004.37 6542 +22.7 4.9 97 90 0 12.0 11.7 83.0 16.7 97 340 11.30
004.41 6643 +22.9 4.9 97 90 0 12.0 12.0 82.7 16.7 97 340 11.31
004.48 6690 +22.9 5.0 97 90 0 12.0 12.1 83.0 16.7 97 340 11.33
004.58 6794 +23.1 5.0 97 90 0 12.0 12.3 86.2 17.0 97 340 11.31
004.62 6848 +22.9 5.0 97 90 0 12.0 12.4 86.2 17.4 97 340 11.27
004.66 6827 +23.1 5.0 97 90 0 12.0 12.2 86.8 17.2 97 340 11.23
004.75 6936 +22.9 4.9 97 90 0 12.0 12.1 86.1 17.0 97 340 11.14
004.80 6995 +22.9 5.0 97 90 0 12.0 12.4 85.9 18.0 97 340 11.14

hmanxx · 12-12-2007, 11:37 AM

cool..thank you very much..this helps alot ..and I can concentrate on the tune.

Bilyk WRX · 01-23-2008, 06:55 AM

do I need bigMAF runing SD with FPGreen and 29PSI ?

Bilyk WRX · 01-25-2008, 08:02 AM

someone?

rewt · 01-25-2008, 08:36 AM

Quote:

Originally Posted by Bilyk WRX

do I need bigMAF runing SD with FPGreen and 29PSI ?

No, a BigMAF is not necessary when running SD.

12-11-2007, 09:35 AM	#1
hmanxx Scooby Newbie Member#: 104120 Join Date: Jan 2006 Chapter/Region: Tri-State Location: NA	SD mode, running air > 5V of MAF sensor If I were to use UTEC SD mode and knowing that the turbo will saturate the stock MAF sensor at 5V. In this case, must I use bigger MAF housing to avoid the MAF sensor saturation ? As in SD mode, it is MAP base, will it affect the SD mode operation once the MAF sensor saturated ? * Registered users of the site do not see these ads.

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12-11-2007, 04:20 PM	#2
Import Car Center Vendor Member#: 162594 Join Date: Oct 2007 Chapter/Region: TXIC Location: Grapevine, Tx Vehicle: 04 WRX STG 4+	when in sd mode, it wont matter if the maf sensor is pegged at 5v as it runs off of the map sensor. when the utec crosses into the sd threshold, the maf is only used as a air temp sensor. thats one of the great things about sd.

12-11-2007, 10:02 PM	#3
AaronWRX Scooby Specialist Member#: 7194 Join Date: Jun 2001 Chapter/Region: MAIC Location: NoVa Vehicle: 2011 997.2 Turbo Black	I find that even with SD it's nice to have MAF voltage to to compare one road pull agaisnt another. A bigMAF run at 4.9v feels a lot different then a bigMAF run at 4.5v

12-12-2007, 11:37 AM	#5
hmanxx Scooby Newbie Member#: 104120 Join Date: Jan 2006 Chapter/Region: Tri-State Location: NA	cool..thank you very much..this helps alot ..and I can concentrate on the tune.

01-23-2008, 06:55 AM	#6
Bilyk WRX Scooby Newbie Member#: 89058 Join Date: Jun 2005 Chapter/Region: International Location: Kiev, Ukraine Vehicle: 2003 WRX 9.63/150mph EJ257+BW S374 735whp	do I need bigMAF runing SD with FPGreen and 29PSI ?

01-25-2008, 08:02 AM	#7
Bilyk WRX Scooby Newbie Member#: 89058 Join Date: Jun 2005 Chapter/Region: International Location: Kiev, Ukraine Vehicle: 2003 WRX 9.63/150mph EJ257+BW S374 735whp	someone?