Boost spool issue

**Madnik** · 09-20-2008 02:41 PM

... i have a 98 A4 1.8T, i decided to install a boost gauge i have a phantom autometer gauge i have installed it btwn FPR and manifold and i get a 20 vaccum reading, but when i go for a run i only get the boost 3-4psi odd times spikes to 5spi... i have also tryed to install it to DV but when installed tehre than i get 9-10 vaccume and boost also 3-4 psi .. i dont think that that is the stoock boost is it ??? ... and if so what could be wrong please hep thanx in advance!!!

**Seerlah** · 09-21-2008 10:14 AM

Stock boost is ~7psi (~11 for the 01). Sounds like you are being granted limp mode boost. You could try and reset the ECU via throttle body adapt and see what happens after that. Unplug the ground from your battery for maybe 10-15 min (Disclaimer:some say you will need the radio code for this, but I did it before and was told that the radio code thing was a fluke. Sure enough, it was. But I hold no responsibility if you need the security code for your radio after this). Connect it back, place key in ignition to starting position [position where all light on dash are on (do not crank)], and let the ECU adapt for maybe 5 min.

Another thing is I would not have tapped into there for the vacuum reading. I was told that it is not always 100% accurate on the gauge (I think that is what it was or maybe it is the other way around) and it is not a place you would want a leak. I would have tapped into the vacuum hose on the front of the intake manifold.

**Madnik** · 09-21-2008 05:18 PM

i did the the steps and no luck still same issue .. i repeated the step 3 times and went 4 a test drive each time and no luck ...any other suggestions would be appriciated is there any common problems that could resuld in this being the case ??? thanx in advance guys !!!

**Seerlah** · 09-21-2008 05:50 PM

One could reset the ECU via Vag Com. Another issue is you could have a boost leak. You would need to do a boost leak test to find out. There are a couple write ups on the process.

Method one
Method two
Method three(the one I use)

You will hear a hissing noice from where ever the leak is coming from, if you have one. That would cause you to lose boost.

**Madnik** · 09-24-2008 08:06 AM

...i have found 2 leak so far while pressurized to 9psi (1 was located between boost brake cylinder and the intake manny on the pressure regulator valve and the other 2 was located by the injectors) so i have ordered at audi the parts (the valve, o-rings and plastic fittings 4 injectors) but unfortunatelly have to wait till saturday to get it al ...so let you know how it goes than!!!

**J Ozzie** · 09-26-2008 12:48 AM

Originally Posted by Seerlah

Stock boost is ~7psi (~11 for the 01). Sounds like you are being granted limp mode boost. You could try and reset the ECU via throttle body adapt and see what happens after that. Unplug the ground from your battery for maybe 10-15 min (Disclaimer:some say you will need the radio code for this, but I did it before and was told that the radio code thing was a fluke. Sure enough, it was. But I hold no responsibility if you need the security code for your radio after this). Connect it back, place key in ignition to starting position [position where all light on dash are on (do not crank)], and let the ECU adapt for maybe 5 min.

Another thing is I would not have tapped into there for the vacuum reading. I was told that it is not always 100% accurate on the gauge (I think that is what it was or maybe it is the other way around) and it is not a place you would want a leak. I would have tapped into the vacuum hose on the front of the intake manifold.

you say stock on a 01 is 11 eh... humm ive got an o1 and im at 15 14.... but then again i have a hollowed out cat.