PSA 2.0TFSi Fuel Pressure and how to check! **Important**
12-11-2005, 03:30 PM
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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
<img src="http://i33.photobucket.com/albums/d78/J_Moss/SF_OEMcopy.jpg">
SF's B7 A4 GIAC "03b"
<img src="http://i33.photobucket.com/albums/d78/J_Moss/SF_GIAC_03bcopy.jpg">
JT's B7 A4 "Brand X"
<img src="http://i33.photobucket.com/albums/d78/J_Moss/BrandXcopy.jpg">
JT's B7 A4 GIAC "03ba"
<img src="http://i33.photobucket.com/albums/d78/J_Moss/JTBrandX_GIACcopy.jpg">
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 <font color="red">SEVERELY</font> injure you if the system is not bled down properly before removal of the original pump. <font color="red"> So if in doubt, DO NOT DO IT! </font>
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
<a href="http://www.torque-factory.com">Torque Factory</a>
To find a local GIAC dealer:
<a href="http://www.giacusa.com">GIAC</a>
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
<img src="http://i33.photobucket.com/albums/d78/J_Moss/SF_OEMcopy.jpg">
SF's B7 A4 GIAC "03b"
<img src="http://i33.photobucket.com/albums/d78/J_Moss/SF_GIAC_03bcopy.jpg">
JT's B7 A4 "Brand X"
<img src="http://i33.photobucket.com/albums/d78/J_Moss/BrandXcopy.jpg">
JT's B7 A4 GIAC "03ba"
<img src="http://i33.photobucket.com/albums/d78/J_Moss/JTBrandX_GIACcopy.jpg">
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 <font color="red">SEVERELY</font> injure you if the system is not bled down properly before removal of the original pump. <font color="red"> So if in doubt, DO NOT DO IT! </font>
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
<a href="http://www.torque-factory.com">Torque Factory</a>
To find a local GIAC dealer:
<a href="http://www.giacusa.com">GIAC</a>
12-20-2005, 12:29 PM
#2
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Re: PSA 2.0TFSi Fuel Pressure and how to check! **Important**
Hi Everyone,
Here is a small update.
<a href="https://forums.audiworld.com/20tfsi/msgs/74.phtml">Update</a>
Here is a small update.
<a href="https://forums.audiworld.com/20tfsi/msgs/74.phtml">Update</a>
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