just got back from my road trip to my lake house... had some minor issuies >

Reply Subscribe

Thread Tools

Search this Thread

May 31, 2008 | 05:22 PM

TTwizted13StrtRcr

Thread Starter

Member

Joined: Dec 2007

Posts: 908

Likes: 0

From: Pittsburgh, PA

just got back from my road trip to my lake house... had some minor issuies >

i had thought i tuned my TT correctly with the boost machine.. but appearantly not

i tested it in 3rd and 4th gear, from 3-4k rpm

i got a steady pull of 17/18lbs of boost... but during the road trip, when i tried holding it and accelerating upward. around 4500 rpm it just jerks, and drops to 10lbs of boost

what is this due to, and how can i fix it?

thanks guys

my boost machine >> pressure relief valve (left) is turned 1 and 3/4 and my regulator (right) is turned 5 and 3/4 turns

May 31, 2008 | 05:28 PM

TTschwing

AudiWorld Uber User

Joined: Dec 2000

Posts: 53,281

Likes: 2

2 things......>

!) Maf may be marginal

2) boost too high

Stock chip (as discussed before) can't take morethan a few PSI increase...A week MAF will exhibit those characteristics (boost pullback) becaue it's output has degraded over time..

May 31, 2008 | 05:30 PM

TTwizted13StrtRcr

Thread Starter

Member

Joined: Dec 2007

Posts: 908

Likes: 0

From: Pittsburgh, PA

so suggesting i reduce boost, and get a new MAF sensor?

May 31, 2008 | 05:35 PM

TTschwing

AudiWorld Uber User

Joined: Dec 2000

Posts: 53,281

Likes: 2

How old's the MAF?

May 31, 2008 | 05:36 PM

TTwizted13StrtRcr

Thread Starter

Member

Joined: Dec 2007

Posts: 908

Likes: 0

From: Pittsburgh, PA

im guessing the original. i bought the car used 6 months ago.

its a 2002 225Q

May 31, 2008 | 05:39 PM

TTschwing

AudiWorld Uber User

Joined: Dec 2000

Posts: 53,281

Likes: 2

Yup......You're probably due then..>>

They can last anywhere from 20K to 80K but gradually decay over time as the measuring surface degrades...Time for a new one!

Especially with the ****, it needs t be operating at 100%