2.0 tdi Acceleration Rate/Challenge/has anyone had a stock one on a SA dyno

[CJ_DT]

Hello hope I grabbed your interest. My golf had an accident and has since been repaired, however it feels very down on power. Insurance company says its on me to prove this. I have taken it to AVW who agrees that it is very down on power, and got a written report to this effect. This wasnt enough for the insurance company.

Which brings me to my next question, it feels as if it has zero boost below about 2300 and is quite hard to get started on a hill.

Can someone or many people with a MkV 2.0 TDI manual try accelerating in 3rd gear on the flat, and time to the nearest second or so amount of time taken to get from 1000-2000 and 2000-3000 rpm.

Also ultimately I think I will need a dyno report to back this up, has anyone had a stock one on a dyno locally (pre chipping etc) so I could go to that dyno for a comparison, or does someone want to put their car on a dyno for just a readout (at my cost)

Chris

[nutttr]

First off, accelerating from 1000-2000 in 3rd isn't good for the car if you are pushing the foot to the floor. 2000-3000 will be fine. The easiest way to do this would be to dyno it, however if the car is THAT much down on power you will see it on the dyno and they should accept it if it is that low, BUT the onus may be on you to prove it wasn't that low from before the accident.

Was it a front hit? Does it sound like air is leaking? There's quite a few hoses in the engine bay and it could be a simple misplaced hose. Or a leaking hose. Is it making any unusual noises? (i.e. air leaking) Can you hear the turbo vanes making their whistle sound? At about 2000 rpm in 3rd and foot about half down if you are driving where there's a concrete barrier, or a narrow road with a rock wall you should hear it whistling.

Another way is get a member with vagcom to help you out - Do a scan to see if there are any error codes (there should be!). With vagcom you can also monitor boost with the cable as well - You should peak at about 1850rpm (in 3rd, flat out!) at about 2.4-2.5 bar (with 1 bar ambient air pressure, so about 1.4-1.5 bar real pressure at the peak).

I'd start by diagnosing it. Alternatively, ask your insurer if you take it to VW and they find a problem, can they/you just bill the insurers for it?

[edit - On a side note, mine was pretty quick from 2000-3000rpm in 3rd on a flat. I'd say 'very'. I've got a chip in mine now, otherwise i'd do the test for you, but it's 'very very' now]

[Fixxxer]

Another way is get a member with vagcom to help you out - Do a scan to see if there are any error codes (there should be!). With vagcom you can also monitor boost with the cable as well - You should peak at about 1850rpm (in 3rd, flat out!) at about 2.4-2.5 bar (with 1 bar ambient air pressure, so about 1.4-1.5 bar real pressure at the peak).

This.

Fixxxer

[h100vw]

I'll scan it for you, PM me for my number. We can check for faults, did AVW do that? Did they log the boost?

Gavin

[CJ_DT]

Hello all, it does sound like its boosting, just feels very doughy compared to what it did. It has been scanned and it showed an AFM? fault that has been cleared.

[nutttr]

Hello all, it does sound like its boosting, just feels very doughy compared to what it did. It has been scanned and it showed an AFM? fault that has been cleared.

If it was a front hit the afm could be broken (they are fragile!) or it could be a broken wire. I'd check the codes again. It should have the fault back! I'd also check the level of boost with vagcom too.

[h100vw]

Scanned this evening. Loads of faults but none in the ECU. Did a fair amount of logs but nothing jumps out from them.

The car does feel pretty dull from the passenger seat. Next to no pull from low down at all.

Diesels not my forte bit I am thinking there's something going on with the turbo. Like maybe the vanes are seized?

Ideas?

Gavin

[nutttr]

If the vanes are seized then it wouldn't pull alot at any rpm.

Did you log the boost?

Check at night, floor it in second from 1500rpm and check in the headlights behind you how much smoke it blows. You should see some but not plumes and plumes!

What error Codes did it have?

[CJ_DT]

Hello, Thanks very much to Gavin for letting me interrupt his tea and then sit in the passenger seat of the worlds most gutless car for half an hour.

Error codes were all just random things with central locking etc etc.

We did log the boost, from what it appears from my very limited knowledge of these things is when its specifying a high boost at 17-1800 RPM, its actually boosting very very low. When its specifying a lower boost (I assume at cruising type speeds) it generally appears to be making the specified boost or better.

Here is a snap of what I am talking about
RPM Specified Actual
1722 2254.2 1244.4
1848 2325.6 1356.6


It does blow some smoke at night when you look back, but never a massive amount.


PS if anyone wants to have a look at the full logs I am happy to forward them on.
Chris

[nutttr]

As someone once told me - Use a google account and upload the spreadsheets to google docs/spreadsheet.

What I can see from what you posted above is terrible! Specified - What the computer is requesting, Actual - What it is measuring (may seem obvious, but anyway)....

It DOES look to me like it isn't operating correctly and my first guess would be the vacuum tube that goes to the actuator on the turbo may be split/broken/missing/incorrectly connected.

It's not easy to access (unless you jack the front of the car up and USE JACKSTANDS), but on the turbo is a small device with a vacuum line attached to it. My guess is that this isn't actuating correctly. You SHOULD have a code thrown though if it isn't. You can 'move' the actuator manually (the actuator is called an 'N75', it is NOT a dump valve, what it does is moves the vanes on the turbo) to make sure it isn't stuck, but my first guess is either the line isn't connected right (trace it, it should go somewhere!), or the actuator connection to the vanes may have come off. I don't know if it's something that could 'fall off' or not, but check it. The only other thing it could be is a leak, you should hear a lot of hissing too though.

If it was an air leak you should see a lot more smoke than 'never a massive amount'. Even when chipped and running right, I blow a lot of smoke!

[Greg Roles]

Nuttr is onto it, I agree it sounds like your vnt vanes aren't operating correctly. Less air plus normal fuel map equals soot! How is the shutdown, does it shudder more than usual, as the anti shudder flap could be stuck somewhat due to oil blowby sludge, but you would expect an error with that....hmm

[CJ_DT]

Hello,

Thanks for the advice guys, I might try and get the car up on a hoist at some point in the next day or three and have a good look and check if there is an obvious issue/s.

I have uploaded a the logs to google docs.

https://spreadsheets.google.com/ccc?key=0Ak6G9LQ50AUodEM3U2RoNnFGckpJNEVOYUVQallpaEE&hl=en&pli=1#gid=0

https://spreadsheets0.google.com/ccc?key=tRoGbugglFJWoCUtMce8cWA&hl=en#gid=0

As I say this is all new to me, and quite intriuiging, if not somewhat frustrating.

I shall keep you posted, and if anyone has any more ideas to try they would be much appreciated.

Car seems to shutdown fine, however there is an odd harmonic that is in the engine at about 850-900 rpm without load, and then also when the car is loaded up at 1800ish RPM, particularly noticeable when trying to accelerate in 6th at 100-110.

Chris

[nutttr]

Get it up and see if anything is amiss. You need some Torx bit to get it off the tray under the engine once it is up it'll be visible.

Oh and you need to set the spreadsheets to public or we cannot view them!

[CJ_DT]

Hello,

I have now made the spreadsheets public (man I wish just once technology would work first time for me).

I had the car up on the hoist this afternoon, took the under tray off (didn't need torx bits because its been reassembled with normal screws.........). Sump is pissing out oil, just great, there was nothing obviously amiss, as in no pipes hanging off the turbo. But aside from that all I could really tell is yes there is a turbo bolted to the engine even if it isn't doing what it should.

Might have a chat with my insurance company tomorrow and see if they are remotely interested in making the car the same as it was before the accident, failing that I guess its off to a workshop to get it fixed. Although every time I drive past a car yard, I do threaten to trade it in in the hope it gets better, no luck yet.

Chris