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View Full Version : Something's not right in my 1.8 world, looking for any suggestions



chucklesmcfarla
05-17-2010, 05:30 PM
History:

AEB 98 a4 1.8 neuspeed chipped and ran like a beast before the original turbo kicked it.

New (used) turbo dropped in this month (thanks BOPOH), which seems to be running fine, I'm seeing 15-18lbs boost.

But...it's sluggish as hell, feels like stock tuning, especially on the highway, just the slightest stumbling and boost fluctuating.

Here's what it aint: DV, n75 (both new), boost leak, plugs (stock and ngks gapped 28-25). Maf flow and intake temps look OK in vag-com

I had to put one new coil in which couldn't handle the new turbo but no misfires or codes since.

So I'm running out of options.

What say ye?

Seerlah
05-17-2010, 05:59 PM
Neuspeed sucks major butt cheeks. Look into that.

05A$SE
05-17-2010, 06:04 PM
id have to say its ur car, no offense but its a b5, so you have a strong motor but not strong power. you cant expect your car to be as fast as a chipped b6

Seerlah
05-17-2010, 06:19 PM
^That was not a good thing to say, especially since it isn't correct. Stock for stock, my car (AWM) has the same power as yours (170bhp) and is lighter. The other B5 A4s have 20 less hp, but that is mainly due to having less boost stock from the factory. How much power does a stg 1 flash add hp wise to a B6?

hercfe
05-17-2010, 06:23 PM
have you done a compression/leakdown test? sounds like that could be an issue.

ScratchRob13
05-17-2010, 06:23 PM
Do you have a Vag-com to do some logs? Like what timing you are pulling? Also try running some seafoam though the motor to clean it up. Some in the fuel... some through the manifold. Injectors could be junked up.

You did a full vac-leak check?

hercfe
05-17-2010, 06:24 PM
^That was not a good thing to say, especially since it isn't correct. Stock for stock, my car (AWM) has the same power as yours (170bhp) and is lighter. The other B5 A4s have 20 less hp, but that is mainly due to having less boost stock from the factory. How much power does a stg 1 flash add hp wise to a B6?

true and not though...because the 01.5-05 all had the upgraded k03s, while the earlier b5's didnt. its not necessarily lower boost, as much as it is a less efficient compressor wheel on the earlier k03 turbos.

ScratchRob13
05-17-2010, 06:27 PM
Mine stock ran like 9psi while lower years were like 7psi

THe actual turbo was labeled as a "sport" turbo... but it really wasn't much different... and it still sucks.

Seerlah
05-17-2010, 06:28 PM
true and not though...because the 01.5-05 all had the upgraded k03s, while the earlier b5's didnt. its not necessarily lower boost, as much as it is a less efficient compressor wheel on the earlier k03 turbos.

That is why I stated "mainly" due to having less boost stock. There are other factors, and you just pointed one of them out. Also, having slightly smaller injectors.

schaefer921
05-17-2010, 06:37 PM
my Revo stage 2 B6 a4 peaks at 23lbs of boost.. holds a lil under(21).. im shocked urs is so low

DUDEFROMRI
05-17-2010, 06:49 PM
First summer with the car? FMIC? Maybe your experiencing heat soak. It can make a chipped car feel less powerful than a stock car. Just my $.02

Euromike
05-17-2010, 07:36 PM
id have to say its ur car, no offense but its a b5, so you have a strong motor but not strong power. you cant expect your car to be as fast as a chipped b6

Completely false buddy. B6's are heavier and slower. And where did that comparison come from? The OP didnt even mention a B6. Get your facts straight before you start ripping on B5's

walky_talky20
05-17-2010, 07:44 PM
What are the long term fuel trims like? What about bad gas? (not *that* kind)

Any brakes stuck on?

PuntA4
05-18-2010, 08:47 AM
Get GIAC

CrtchRktRcr
05-18-2010, 08:53 AM
Neuspeed sucks major butt cheeks. Look into that.

I would expect more out of you partner...

Can you give me some evidence of this? Besides my thread about my ecu shitting the bed.


I'm not reading through the entire thread because the first 2 points irritated the shit out of me. The guy who posted after seerlah get a fucking clue you d-bag.

Sounds like a possible clogged cat. Do you have a tp? Maybe tip collapsing?

chucklesmcfarla
05-18-2010, 01:52 PM
thanks for the serious answers people. FWIW it was Neuspeed chipped when I got it and ran great.

crtchrktrcr - I just put a new oem inlet hose on. everything post turbo is samco. as for cat, yeah that's what it feels like, but shouldn't the rear o2 sensor be complaining?

walky_talky - what MBs are you suggesting for fuel trims?

scratch rob - same question, what MBs are you referring to?

It's an AEB so I'm missing a lot of blocks

Thanks folks...

chucklesmcfarla
05-18-2010, 02:39 PM
answered my own question, here's my timing log:


http://i43.photobucket.com/albums/e384/chucklesmcfarland/5-18timinglog.jpg

CrtchRktRcr
05-18-2010, 02:57 PM
i'm not familiar with VAG screens.. so what was the outcome?

a stock inlet could be folding up under higher boost. You have the 1bar right? do you have a 5barfpr? What boost is peak boost?

ScratchRob13
05-18-2010, 04:12 PM
answered my own question, here's my timing log:


http://i43.photobucket.com/albums/e384/chucklesmcfarland/5-18timinglog.jpg

Is that at WOT? I cant seen TB or engine load %

chucklesmcfarla
05-18-2010, 04:44 PM
yep WOT, 3rd gear 2300-6000rpms,
are you talking about block 114?
this is 012 020 026

chucklesmcfarla
05-21-2010, 01:47 PM
So I just checked block 032 AKA fuel trims and I'm not seeing any movement at all in either number. Both stay at zero, idle or moving.

Every other block I checked is within spec or tested ok.

hmmmm

brockallentaylo
05-22-2010, 11:46 AM
I would pull that cat off, I have seen normal fuel trim behavior on a partially clogged cat, look for some of the little squares on the front of the cat to be contaminated, it doesn't take much. Surely that blown turbo was contaminating the cat and led to its early demise.

Hopefully it's just time for a test pipe! More power and response for $150 anyhow.

chucklesmcfarla
05-22-2010, 03:33 PM
Do ya think it could be clogged even if all the cat measuring blocks passed?

And the old turbo never gave any smoke from the exhaust.

Racerx220
05-22-2010, 03:33 PM
if it looks bad just hollow it out with a pipe till you get a high flow or a test

brockallentaylo
05-23-2010, 12:21 AM
Do ya think it could be clogged even if all the cat measuring blocks passed?

Definitely, you can have a partial clog and still have normal readings, you usually still see more than normal timing retard because the cylinder temps go up and cause detonation, but unless you know exactly how they were before then that does not help much. [/COLOR]

And the old turbo never gave any smoke from the exhaust.

That you know of, you can overheat a cat pretty easy without "seeing" any smoke. Its easy enough to pull the DP or manifold to check at least.

turbo_bootin
05-23-2010, 07:46 AM
So I just checked block 032 AKA fuel trims and I'm not seeing any movement at all in either number. Both stay at zero, idle or moving.

Every other block I checked is within spec or tested ok.

hmmmm

032 is the long-term fuel trims. It really shouldn't be exactly zero... did you recently reset the ECU or anything? If you wanted to see real-time fuel trims, log 031.

chucklesmcfarla
05-23-2010, 06:18 PM
Well, that cat has zero sign of blockage or even discoloration. I even stuck a wire down it's gullet a few times just to be sure.

So I reckon I'm gonna start looking at fuel issues.

Yeh turbo_bootin, I realized that last time I scanned it, my bad.