ABY ECU Intermittent issue

[edge_devil]

Black box showed 4444 so that's good


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[edge_devil]

WG Spring fully pre-loaded....

I kid you not, I took the wastgate cap off and the preload (I'm assuming that is what it is called) was fully wound in. Combine that with a set of modified chips, a blue spring and a 250 kpa MAP something doesn't add up.

First the spring, I'm thinking this is a 1.9 or 2.2 bar spring ?


Secondly the pre-load, I wound the screw half a turn further and it fell out of the casing, there was no more pre-load available!!!


...and finally the Chips. I've removed the labels and checked what chips they actually were. I'm assuming both of these are reprogrammable.

[UrS4boy]

Stock on the right. 1.9 Bar on the Left

[twoqu]

Wategate spring looks ok. Measured one at 83mm length, 38.5mm OD and 2.8mm wire diameter. I don't have blue paint though but a silver blob.
It did not look like the cap on the wastegate top had been removed which is often the case if someone has altered the preload. Doesen't exclude someone messing. There are some dimensions on here somewhere. Failing that I'll get a dimension to put it back to stock. The screw shouldn't have been near the end of its thread though methinks!
The chips. The 87C has a window so it proabably reusable. The 512 looks like a one shot job although I am no expert!

[twoqu]

Not sure if this is helpful:

http://www.s2forum.com/forum/showthread.php?t=42525&highlight=wastegate

[twoqu]

Get us a shot of the top of the wastegate cap. If you can see the threads then the tamperproof cap has been removed which would obviously allow somebody to wind the screw in! Not good.

[edge_devil]

On the road now, but yes the tamperproof cap is removed..... it'll be back to 'measure/adjust/test' then

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[twoqu]

As mentioned previously it less hazardous to have less boost than too much. If you have a boost gauge you could use that to set a baseline of 0.4bar with the WGFV disabled electrically. This will throw a code I would think.
Other than that start with the dimension in that link which should be in the ballpark.
Does highlight the issue of checking stuff before condeming other stuff. Not even the stock chips will like the wastegate screw wround right in!

[edge_devil]

I don't have a boost gauge yet but I have considered one, so now may be the time just I don't want to mess up my dashboard. I am also considering taking the wastegate off and testing with a bicycle pump to get it approximately right

I'm away from home for a few days, but I'll try and get in on Wednesday night.

I reckon the photo from urs4 shows me that this is a 1.9 bar spring.

@ twoqu. The 18mm mentioned in your other post, is that from the tip of the bolt to the machined base inside the cap ?

[edge_devil]

WG Cap measurement

So A-D, B-C, A-D, B-D or A-C

[twoqu]

You are looking at the spring pic wrong. The std one is on the right which looks like what you have.
I think I was measuring from where the spring sits on the spring seat down to the base of the cap.
Basically the screw barely makes it though the bottom of the cap.
Can probably provide another dimension to get you in the ballpark if thats not clear enough. If you invert the cap so you are loking at the inside and place the spring seat over the screw, the top of the spring seat OD should be in the region of 18mm from the bottom of the cap vertically.

[newsh]

Pretty sure you have a stock spring there. If the anti tamper plug is removed then just bring the screw back up till you just have 4 -6 threads showing where the plug would be, this will put you in the ballpark. The final spring preload should be set with a boost gauge on the car with WGFV unplugged. You can fit a temporary boost gauge although it's a good bit of kit to have on the car.

[edge_devil]

<< Left The other Left >>

Yep I was wrong with the spring

[edge_devil]

Ok thanks for the advice guys, I'll check the rest of the cap and see if I can screw it back up to a standard'ish position.

I'll have to see if I can buy the boost add on for my dashboard (DD2_lite)

[edge_devil]

Standalone boost gauge ordered so hopefully I can get in at the weekend and check this out. The thread inside the cap is a bit burred so it looks like I'll have to tap that just to clean it up.

...and who the hell ordered this rain???