PSA 2.0TFSi Fuel Pressure and how to check! **Important**

J.Moss@TorqueFactory · 12-11-2005, 04:29 PM

Hi Everyone,

The new TFSi system for the VAG product line brings quite a few new challenges to the table and the learning curve is / and will be steep!

One of the problem areas that seems to be cropping up is the ability of the original "Rail" pump to sustain the spec'd pressure (about 110 BAR) under high torque conditions. This is a problem that has been known to GIAC for some time and has been checked during the development of the programs that are now being released.

The data group that shows pump rail pressure is 205; I suggest that you log this in conjunction with another group that shows RPM. Also please note that this should be checked under high load conditions. I.e. The problem is more pronounced in a 5th gear pull than a 2nd gear pull (this also relates to dynos that do not have enough load). Some examples below:

SF's B7 A4 stock

SF's B7 A4 GIAC "03b"

JT's B7 A4 "Brand X"

JT's B7 A4 GIAC "03ba"

The normal range appears to be about 110 BAR at wide open throttle. And from my understanding there is a fault code that pops up when pressure drops below about 90ish bar. The car shown above with the dropping pressure did not have a code, and it is suspected that some are turning off this feature. GIAC does not.

Before everyone panics!

There is a replacement pump that will be available to GIAC dealers shortly that will help with this problem. If you see this problem, please call regardless of the brand of chip that you have. We do not want to create an environment of fear in tuning these excellent motors, and, surely when all of the tuner take a look and correct this, it will no longer be an issue.

Please note that the fuel delivery system operates in a range of 725 to about 1750 psi. This can SEVERELY injure you if the system is not bled down properly before removal of the original pump. So if in doubt, DO NOT DO IT!

If any of you are in the Los Angeles area and are interested in the GIAC product I hope to hear from you.

Take care, and have fun all!

Jeff Moss

Torque Factory, Inc.
2304 Zeno place
Venice, CA 90291
310-466-4296
Moss@torque-factory.com
Torque Factory

To find a local GIAC dealer:
GIAC

Mike2kS4 · 12-11-2005, 06:09 PM

I'm still waiting for a GIAC chip for the A3... ETA?

J.Moss@TorqueFactory · 12-11-2005, 06:25 PM

NP Mike. Good luck with the S BTW.

Jeff

RikiTik · 12-11-2005, 06:48 PM

speed13 · 12-11-2005, 08:26 PM

Mike2kS4 · 12-11-2005, 09:24 PM

S4 is back up to 445whp snuff, even in conservative trim

J.Moss@TorqueFactory · 12-11-2005, 10:10 PM

Would be curious to see some testing with comparable conditions.

I.e. Same dyno.

AWE is ready to go. Are you close to Shimon? He should have a cable coming soon.

Jeff

J.Moss@TorqueFactory · 12-11-2005, 10:11 PM

Mike2kS4 · 12-11-2005, 10:27 PM

The last dyno I was on was pretty brutal, I'm sure it'd do much better on a more normal dyno. It's so bad the dyno owner made ME drive the car on the dyno so if it blew up it wouldn't be on him, lol.

I'm closest to AWE. Their website doesn't indicate the A3 Xchip being ready. I'll give them a call tomorrow and make an appointment to have some 1's and 0's installed

crew219 · 12-12-2005, 12:34 AM

12-11-2005, 04:29 PM	#1
J.Moss@TorqueFactory Senior Member Account #: 15175 Join Date: Jan 2001 Posts: 5,077	PSA 2.0TFSi Fuel Pressure and how to check! Important Hi Everyone, The new TFSi system for the VAG product line brings quite a few new challenges to the table and the learning curve is / and will be steep! One of the problem areas that seems to be cropping up is the ability of the original "Rail" pump to sustain the spec'd pressure (about 110 BAR) under high torque conditions. This is a problem that has been known to GIAC for some time and has been checked during the development of the programs that are now being released. The data group that shows pump rail pressure is 205; I suggest that you log this in conjunction with another group that shows RPM. Also please note that this should be checked under high load conditions. I.e. The problem is more pronounced in a 5th gear pull than a 2nd gear pull (this also relates to dynos that do not have enough load). Some examples below: SF's B7 A4 stock SF's B7 A4 GIAC "03b" JT's B7 A4 "Brand X" JT's B7 A4 GIAC "03ba" The normal range appears to be about 110 BAR at wide open throttle. And from my understanding there is a fault code that pops up when pressure drops below about 90ish bar. The car shown above with the dropping pressure did not have a code, and it is suspected that some are turning off this feature. GIAC does not. Before everyone panics! There is a replacement pump that will be available to GIAC dealers shortly that will help with this problem. If you see this problem, please call regardless of the brand of chip that you have. We do not want to create an environment of fear in tuning these excellent motors, and, surely when all of the tuner take a look and correct this, it will no longer be an issue. Please note that the fuel delivery system operates in a range of 725 to about 1750 psi. This can SEVERELY injure you if the system is not bled down properly before removal of the original pump. So if in doubt, DO NOT DO IT! If any of you are in the Los Angeles area and are interested in the GIAC product I hope to hear from you. Take care, and have fun all! Jeff Moss Torque Factory, Inc. 2304 Zeno place Venice, CA 90291 310-466-4296 Moss@torque-factory.com Torque Factory To find a local GIAC dealer: GIAC __________________ Sport Compact Car 2007 Ultimate Street Car Challenge Winner Jeff Moss, ASE Certified (A1, A3, A4, A5, A6, A8) <a href="http://www.torque-factory.com">Los Angeles area GIAC dealer for Audi, Bentley, BMW, Mini, Porsche and VW. Torque-Factory, Inc.</a> Torque-Factory Support Forum

12-11-2005, 06:09 PM	#2
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,105	Good info, thanks Moss.... I'm still waiting for a GIAC chip for the A3... ETA? __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

12-11-2005, 06:25 PM	#3
J.Moss@TorqueFactory Senior Member Account #: 15175 Join Date: Jan 2001 Posts: 5,077	A3 is ready to go. Many dealers already have the new required cable. NP Mike. Good luck with the S BTW. Jeff __________________ Sport Compact Car 2007 Ultimate Street Car Challenge Winner Jeff Moss, ASE Certified (A1, A3, A4, A5, A6, A8) <a href="http://www.torque-factory.com">Los Angeles area GIAC dealer for Audi, Bentley, BMW, Mini, Porsche and VW. Torque-Factory, Inc.</a> Torque-Factory Support Forum

12-11-2005, 06:48 PM	#4
RikiTik Member Account #: 55719 Join Date: May 2003 Posts: 2,301	Any performance products on the horizon for the 3.2?

12-11-2005, 08:26 PM	#5
speed13 Junior Member Account #: 32092 Join Date: Feb 2002 Posts: 520	Just checked out 3 cars all OK

12-11-2005, 09:24 PM	#6
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,105	Thanks Jeff. I assume AWE should be ready to go. S4 is back up to 445whp snuff, even in conservative trim __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

12-11-2005, 10:10 PM	#7
J.Moss@TorqueFactory Senior Member Account #: 15175 Join Date: Jan 2001 Posts: 5,077	Looks like it is running great. Would be curious to see some testing with comparable conditions. I.e. Same dyno. AWE is ready to go. Are you close to Shimon? He should have a cable coming soon. Jeff __________________ Sport Compact Car 2007 Ultimate Street Car Challenge Winner Jeff Moss, ASE Certified (A1, A3, A4, A5, A6, A8) <a href="http://www.torque-factory.com">Los Angeles area GIAC dealer for Audi, Bentley, BMW, Mini, Porsche and VW. Torque-Factory, Inc.</a> Torque-Factory Support Forum

12-11-2005, 10:11 PM	#8
J.Moss@TorqueFactory Senior Member Account #: 15175 Join Date: Jan 2001 Posts: 5,077	Absolutely. Just give us a wee bit of time :) __________________ Sport Compact Car 2007 Ultimate Street Car Challenge Winner Jeff Moss, ASE Certified (A1, A3, A4, A5, A6, A8) <a href="http://www.torque-factory.com">Los Angeles area GIAC dealer for Audi, Bentley, BMW, Mini, Porsche and VW. Torque-Factory, Inc.</a> Torque-Factory Support Forum

12-11-2005, 10:27 PM	#9
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,105	Sounds good... The last dyno I was on was pretty brutal, I'm sure it'd do much better on a more normal dyno. It's so bad the dyno owner made ME drive the car on the dyno so if it blew up it wouldn't be on him, lol. I'm closest to AWE. Their website doesn't indicate the A3 Xchip being ready. I'll give them a call tomorrow and make an appointment to have some 1's and 0's installed __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

12-12-2005, 12:34 AM	#10
crew219 Member Account #: 74688 Join Date: May 2004 Posts: 4,924	wonders if "brand X" begins with an "A" and ends with "R" __________________ tyranny and anarchy are never far apart

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