fuel pressure

[sub555]

a coupe of questions can i fit a fiat coupe 20v turbo fuel pressure regulator on my Q4 to try and up the fel pressure alos the car suffers from stammering under full load at about 4500 rpm ive been told this is becuse of a fuel pipe in the tank leaking has anybody else had this problem any help would be appreciated

[jimnielsen]

Hi sub555, I can't answer your new questions, but I wanted to ask you one!.. I read your post from back in April 2007, where you had fitted a new clutch and release bearing etc and then you found out that you had a noisy release bearing. The same thing seems to have happened to me....What was the final result with your "noise" issue did it turn out to be the release bearing or something else???

Thanks, JimN~

[#84]

Sub555 - you can always increase the fuel pressure on you standard regulator up to around 3.5 bar, but the fuel pump might not be sufficient.

If you have modified your exhaust and inlet system and haven't modified the softare, or only moderate updates of the software, then you might hit the boost limiter at 4400 rpm. Please see table below:

[rpm] [kPa]
400 50
800 50
1200 50
1601 51
2001 73
2401 133
2803 133
3205 133
3606 120
3998 109
4401 96
4808 86
5208 80
5614 80
5990 80
6510 80

/A

[sub555]

Hi sub555, I can't answer your new questions, but I wanted to ask you one!.. I read your post from back in April 2007, where you had fitted a new clutch and release bearing etc and then you found out that you had a noisy release bearing. The same thing seems to have happened to me....What was the final result with your "noise" issue did it turn out to be the release bearing or something else???

Thanks, JimN~

hi jim i found that the startermotor was not fully disengauging when you put the clutch down the noise would change making me belive it was the clutch bearing but when i removed the starter i found all the teeth on the end of the cog on the starter were ground away so i changed the starter and the problem has been solved

hope this helps jim

[sub555]

Sub555 - you can always increase the fuel pressure on you standard regulator up to around 3.5 bar, but the fuel pump might not be sufficient.

If you have modified your exhaust and inlet system and haven't modified the softare, or only moderate updates of the software, then you might hit the boost limiter at 4400 rpm. Please see table below:

[rpm] [kPa]
400 50
800 50
1200 50
1601 51
2001 73
2401 133
2803 133
3205 133
3606 120
3998 109
4401 96
4808 86
5208 80
5614 80
5990 80
6510 80

/A

great i think that might be my problem time to get a squadra chip i think thanks for your help