A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Normal boost for FL heat?

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Old Aug 8, 2007 | 03:06 PM
  #1  
naudi1.8's Avatar
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Default Normal boost for FL heat?

The car has about 95K now with an APR chip and Forge DV since 75K. Just about a week ago i finally got around to putting a boost guage in. I was quite surprised as I was only holding 13 pounds in 4th and 5th and even less in the first 3. Vacuum was about 17 when warm. Well after STFA i replaced all the old crappy stock braided hoses that were in bad condition. Also the L-Hose was replace not to long ago to. Now im holding 17psi in 4th and 5th and 15-16 in the first 3. Vacuum at idle is now 20 to 21 at idle and 23 off the throttle in gear. So am I still leaking or is this normal for 90+ degree weather in S Florida? BTW all of these numbers are with A/C off. I've read some people are getting 20 to 21lbs. here is what ive replace so far

<a href="http://photobucket.com" target="_blank"><img src="http://i13.photobucket.com/albums/a292/pnizio/vac-lines.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
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Old Aug 8, 2007 | 03:20 PM
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looks good to me - I have the same numbers for vac
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Old Aug 8, 2007 | 03:31 PM
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Default on an '01, 20-21 is the spike and holding 17-18 is the norm. pressure test it. might still have a

little leak or you might need to do a TBA.

when cold, turn the key to the on position and wait for the whine to stop. turn the key and let it sit for about a minute.

when was the last time your Forge was serviced?

also, the wastegate flap might be showing the first signs of wearing out = new turbo at some point. that's what happened to mine. internals were good, but it wouldn't hold what it was making. what are you holding at redline?
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Old Aug 9, 2007 | 04:39 AM
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Default Re: on an '01, 20-21 is the spike and holding 17-18 is the norm. pressure test it. might still hav

the Forge has not been serviced. I dont even know how to service my DV? I'll try the TBA today and see if that changes anything.

The boost holds 17 until 5K. Then from 5K to 6.5K it drops to about 8 or 9 in 4th gear. Had to wait until this morning to respond because its been some time since its been to redline .

New turbo huh. APR SIII here I come!

I did a compression test a few weeks ago and numbers were.

1 - 185
2 - 185
3 - 185
4 - 189

Are these numbers good for 95K and possibly SIII?
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Old Aug 9, 2007 | 10:44 AM
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Do a boost leak test. Could be a number of things, for instance my injector seals were leaking...
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