For the life of me I cannot get more that 7-8lbs of boost, spikes MAYBE 9.

Here's my setup:
2000 A4 (B5) 1.8T 5spd Quattro
Stock ECU
K04
Front mount large intercooler (side to side behind bumber)
Forge DV (I've also tried my TurboXS BOV.
SOJ nightmare removed, followed Walky-Talky's DIY.
N248 I believe it's called has been bypassed.
BOV/DV direct vacuum from manifold.
3" Exhaust thru single chamber race muffler
Cone K&N filter under a Carbino vent and heat shield.

What else could be stopping me from creating more boost?

 

Can you provide us with more information on the car?

Year, any other engine/ECU modifications, etc.

From where I'm sitting I don't see a problem... if you have a 2000 A4 your boost should only be about 7-8psi, assuming stock (non-tuned) ECU.

 

Added info inline above...

So the ECU itself will prevent boost?
I know a chip is in my near future, I have already been looking over APR, and GIAC... I am in socal and have a few dealers for each within an hour drive.

How does the ECU prevent boost, by opening wastgate? cause I have bypassed the N248 I think it is that would control the DV.

 

The ECU controls boost primarily through the N75, which controls the wastegate on your turbo, sort of like an electronic boost controller. In stock form the ECU won't allow boost past 7-8psi. Ideally your tune would be the best way to increase boost, but there are other cheap methods such as the "diode mod" (which uses a diode on the MAP sensor connector and a MBC in place of the N75).

Other than through the N75, the ECU can also sort of control boost by closing the throttle, but this is more of a protection method.

N249 only controls DV operation. After reading a bunch about this I actually re-installed the N249 in my 2001 1.8T. Deleting it only simplifies the engine bay, doesn't have any performance benefit.

 

It's actually worse for performance and you'll get worse fuel economy off-boost, the only benefit is removing a couple of vacuum lines. N249 is only used to open the DV in times where it would be otherwise closed by the N75, namely when clutching in during shifts and sometimes when the IM is under vacuum.

 

Makes sense... I read something about an N75J (I think it was) affecting boost as well?

By adding the diode are you essientially bypassing or rendering the N75 useless or just altering the signal sent to the ECU?
**EDIT** Sorry just reread it and you said replaces it.

I will search for this as well... thank you for the tip.

I believe that's true as well, I bypassed mine more as part of my search for boost. It's hidden so it barely cleans up anything bypassing it anyways... the SOJ I think it is, what a miss that was, it's nice seeing that gone lol

 

Oh crap, then I better stay in boost

I think I will reconnect it then, like I say I was just bypassing it almost as trouble shooting.

 

I also just got in the mail yesterday the billet pcv from 034, that's going in soon too.

 

Suction jet pump? That thing is awful. I converted my 2001's vacuum system to almost the same as a 1998-1999 except for the N249 (which did not come in the A4 until 2000).

My opinion on this piece: don't use it. It caused idle issues in my 1998. Those issues went away as soon as I replaced the 034 billet PCV valve with an OEM PCV valve.

 

Oh whoops yup... SJP then lol

Maybe I wont, I am suffering no issues with my idle... I merely got it because I know/read a faulty pcv can also cause boost issues, however I got trigger happy and ordered it then continued reading... since learning it is likely the LAST thing I need to replace lol