AudiWorld Forums
Audi Models
Audi A4
A4 (B5 Platform) Discussion
More "bumpy" boost curves...please diagnose as needed...boost leak?

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

More "bumpy" boost curves...please diagnose as needed...boost leak?

Reply Subscribe

Search this Thread

Old

Oct 30, 2006 | 12:23 PM

#1

AutoXJunkie (Justin)

Thread Starter

Senior Member

Joined: Mar 2004

Posts: 7,189

Likes: 0

Default

More "bumpy" boost curves...please diagnose as needed...boost leak?

<center><img src="http://pictureposter.audiworld.com/72544/block115-3rd-82f.jpg"></center><p>
I'll also post the excel chart w/CF's included.

Reply

Old

Oct 30, 2006 | 12:29 PM

#2

AutoXJunkie (Justin)

Thread Starter

Senior Member

Joined: Mar 2004

Posts: 7,189

Likes: 0

Default

Chart which includes CF's

<center><img src="http://pictureposter.audiworld.com/72544/20-115chart.jpg"></center><p>This is the chart for the run that was graphed above. I notice only Cyl. 4 has timing pull on this run...unusual? Taking brief peeks at the screen throughout my drive, various WOT bursts would produce pull from all 4 most of the time...cyl 2 had the fewest runs that had any pull what so ever.

Reply

Old

Oct 30, 2006 | 12:37 PM

#3

Sal R.

AudiWorld Super User

Joined: Nov 2000

Posts: 10,887

Likes: 0

Default

What's your setup?

Reply

Old

Oct 30, 2006 | 01:18 PM

#4

AutoXJunkie (Justin)

Thread Starter

Senior Member

Joined: Mar 2004

Posts: 7,189

Likes: 0

Default

APR v.3.1 + Test Pipe

Reply

Old

Oct 30, 2006 | 01:23 PM

#5

Sal R.

AudiWorld Super User

Joined: Nov 2000

Posts: 10,887

Likes: 0

Default

Looks fine to me. I am surprised to see a lot of 0's in your CFs, not that that is a bad thing.

Reply

Old

Oct 30, 2006 | 02:28 PM

#6

AutoXJunkie (Justin)

Thread Starter

Senior Member

Joined: Mar 2004

Posts: 7,189

Likes: 0

Default

there's overboost, followed by overcorrection by the N75...(what I've been told)

Reply

Old

Oct 30, 2006 | 09:45 PM

#7

beejohn

AudiWorld Super User

Joined: Dec 2004

Posts: 3,589

Likes: 0

Default

you should do a compression test

get the kit from autozone

Reply

Trending Topics

UK: Received our first MOT warning on our 2018 A5, now what

21

628
Stupid thread: D5 vs Rolls Royce Phantom

19

688
Spoiled by 800km

8

158
Oil anti drain back failure

20

569
CarPlay & Android Auto Replacement Head Unit?

77

47k

Old

Oct 31, 2006 | 03:18 AM

#8

AutoXJunkie (Justin)

Thread Starter

Senior Member

Joined: Mar 2004

Posts: 7,189

Likes: 0

Default

yes, about a month ago, 180-175 across the board IIRC

Reply

AudiWorld Stories

Bringing Audi to Life for Audi Fans

New Audi A6 Allroad Is The Market's Coolest Wagon: 9 Things to Know

Pouria Savadkouei

10 Strangest Audi Designs That Actually Made Production

Joe Kucinski

2027 Audi Q7 and SQ7: Audi Upgraded EVERYTHING!

Michael S. Palmer

Audi Unveils Absurdly Cool New Supercar: 10 Things You Need to Know!

Verdad Gallardo

The Highs & Lows of Every Audi C-Class Generation

Joe Kucinski

Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer

Brett Foote

10 Audi Features & Options We Miss the Most!

Joe Kucinski

Audi Recreates Crazy-Looking Speed Record Breaker From 1935

Verdad Gallardo

Coachbuilder Recreates the 1995 Audi TTS Concept

Verdad Gallardo

Every Audi V10 Car Ranked!

Joe Kucinski

Old

Oct 31, 2006 | 06:02 AM

#9

Sal R.

AudiWorld Super User

Joined: Nov 2000

Posts: 10,887

Likes: 0

Default

Boost spike. Also apparent on my APR v?.?

Except I was spiking to 21 psi at the same RPM range.

Reply

Old

Oct 31, 2006 | 06:12 AM

#10

AutoXJunkie (Justin)

Thread Starter

Senior Member

Joined: Mar 2004

Posts: 7,189

Likes: 0

Default

21psi? ouch. I'm going to source a new N75 and go from there

if the problem still exists...well...I don't know. lol

Reply

Reply Subscribe

Related Topics

Thread

Thread Starter

Forum

Replies

Last Post

Stumble on acceleration

typ44q

TT (Mk1) Discussion

9

May 9, 2011 12:21 PM

Boost and MAF logs inside... boost leak?

eph94

New England Discussion

8

Jun 24, 2007 12:22 PM

A4ORCE1

A4 (B5 Platform) Discussion

7

Jul 22, 2006 11:10 AM

boost cutting at 14psi. boost leak? fueling issue?

The Crapple

Audi Original "S" Cars

1

Feb 3, 2006 04:24 PM

boost leak test kit...??

audi80greece

Audi Original "S" Cars

1

Dec 1, 2005 03:16 AM

Reply Share

First
Prev
1 / 1
Next
Last

All times are GMT -8. The time now is 04:19 PM.