ABY ECU Intermittent issue

[edge_devil]

...they are the ones that came with the ecu when I purchased the engine....

I'm trying to get back to standard as a benchmark that's gonna be scary enough!

[S2central.net]

Would be good to get it fettled properly on stock chips... I can help you with a nice upgrade when it stops scaring you in stock mode ;-)

[edge_devil]

- those pre-insulated spade plugs are the devil's invention.

I have a winter list of clear up jobs, including those and sorting my boxes of bits and pieces in my garage!

[edge_devil]

I only had her up to 3300 rpm, and that was ballistic, remember it's only about 720kg.....

[edge_devil]

New Video

So I've added an external mic to the camera, and made another video. Although the sounds not perfect, its better, but being an open cockpit I'm not gonna cut all of the wind sound out.



I am pretty sure the ECU chips I have need a 300kpa MAP sensor as when I get up to about 4500 I seem to loose boost. If I get a chance I'll run her with the WG valve disconnected and see how that goes. The boost gauge I ordered arrived today, but is knackered, typical!!

[twoqu]

Would have been better to shake it down with stock chips. When you know it performs as it should then you can look at increasing power.
You will need to familarise yourself with the basics. Fault codes and pressure testing. They are the basic trouble shooting procedures. Not having a boost gauge makes diagnosing boost issues problematic.
The chips you have as mentioned previously should suit all the stock hardware inclding the map sensor as basically the maximum they support. The 285PK = 281bhp which is what most upgrades give as its the most cost effective upgrade. We don't seem to know a lot about these chips.
So check for any fault codes first.

[edge_devil]

Have a boost gauge. ..a quick test showed only 1 bar of boost before WG opened...but that was not with the WG valve disconnected...tomorrow I'll try and experiment further......

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[twoqu]

The stock level should be around 1 bar although under overboost conditions that would be increased slightly. The upgrade chips should be in the 1.4 bar region. Both usually use the stock wastegate spring preload.
As we have discussd previously it is better to make sure that the wastegate has the 0.4 bar mechanical boost level first by electrically disconnecting the wastegate valve, especially as it has been adjusted previously.
Then if it does not make more boost than stock you will have to investigate why!

[edge_devil]

I've just driven it with the wastegate valve disconnected, between 0.6 and 0.8 bar of boost..so the spring looks OK.

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[twoqu]

Sounds too high!
You will need to wind out the screw to get it below say 0.5bar. It might take a bit of experimentation. There is still that nagging doubt about the spring.
Then clear the codes and it should be close.
The only thing we cannot quantify is the quality of the SW as there is no feedback on them.

[edge_devil]

Quick update:

Latch adapter arrived this morning (Boost Button) and I dropped the chips in Robin had programmed for me and it worked fine, so I now have a standard ECU mapping to benchmark the car!

Have wound the pre-load screw back some more and will try a test run later, hopefully we'll see about 0.4-0.5 on the gauge with the WGFV disconnected, then we are back to base.

TTFN

Tim

[S2central.net]

Happy days - that is best way to establish your baseline and check for any fault codes, odd mixture etc.

[edge_devil]

Well that's annoying..... it runs okay but boost is now 0.9 with WGFV disconnected!

Could I have an uprated spring?

I'll take the Wastgate top off again and see if I can screw the pre-load back some more.

[twoqu]

Well there are aftermarket 0.9bar springs but usually they are shorter and the wire diameter greater.
I was a little concerned with the spring as it was a tad shorter than expected although it looked like a stock spring. The blue paint mark was different to the one I had which is silver paint. Not that I have seen every wastegate spring that Audi has fitted. I will check another stock w/g.
Best thing to do is pop the cap off and measure the diameter/wire thickness/length.

[UrS4boy]

,,Best thing to do is pop the cap off and measure the diameter/wire thickness/length.

1.9 Bar (absolute) spring on the left, stock on the right