Project: RS2 ABY

[prj]

Why does the RS2 throw a fault code for the hall sender when the timing is misaligned?
Somehow it must be picking that up. Of course we know little of the Motronic mysteries, but the timing window must have some function other than just confirming that the engine is phased correctly. Its critical enough for Audi/Porsche to reposition it. If it is used to sort of work out where everything is at the beginning and its wrong, isn't that going to cause problems?
Disclaimer: Not looking for an argument, only to help Sonic!

Wrote about it before reading your post.
But yeah, basically it is used as a sanity check within some margins. It's meant to put the car into limp mode with a slipped belt etc.
But that's the only thing it is really used for aside from engine phase.

There's pretty much no logic in the ECU that runs every *two* crank revolutions. That's a lot of time, the ECU works much faster than that.

[twoqu]

Wrote about it before reading your post.
But yeah, basically it is used as a sanity check within some margins. It's meant to put the car into limp mode with a slipped belt etc.
But that's the only thing it is really used for aside from engine phase.

There's pretty much no logic in the ECU that runs every *two* crank revolutions. That's a lot of time, the ECU works much faster than that.

So compared with say the flywheel pin, it's a pretty crude indicator of camshaft position? Before Dave appears, the manual says that the G40 is used to recognise ignition TDC in No1 cylinder (as well as knock control ).

[Avantus]

I bought my car with the cambelt misplaced one tooth.
It drove perfectly normal up until 4000rpm, where it suddenly cutted out hard. It showed a camshaft pos. sensor fault indeed.

[prj]

So compared with say the flywheel pin, it's a pretty crude indicator of camshaft position? Before Dave appears, the manual says that the G40 is used to recognise ignition TDC in No1 cylinder (as well as knock control ).

Yeah, G40 is used to understand in which phase the engine is for initial startup (you wouldn't know if the first cylinder is on it's compression or exhaust stroke otherwise) and it is also fed to the boost/knock chip, so that it can know in which cylinder the combustion is happening, because we have two sensors and five cylinders.
There is a replacement function for that though, based on crank angle and speed sensor after the initial startup through the fuel chip.

What you are saying is correct, just it won't cause any of the issues Sonic is experiencing.

P.S.
Plus the sanity check function to make sure the belt has not slipped.

[Sonic]

r201 is changed - i shall let you know how it runs in the car

[prj]

r201 is changed - i shall let you know how it runs in the car

It should run a bit richer than it ran on Ross' ECU, and a little bit less power because your car has baseline timing, and Ross' has custom mapped timing to his car.

Now we just need to hunt down the boost problem, and then preferably get an AFR log of the car at WOT to see if boost and AFR levels roughly match up.

[Sonic]

I'm assuming i'll instantly see the difference on idle after putting the ecu back in? Even when cold?

That's the plan for the weekend, just need to get the car a few hundred miles back up north

[prj]

I'm assuming i'll instantly see the difference on idle after putting the ecu back in? Even when cold?

That's the plan for the weekend, just need to get the car a few hundred miles back up north

Yeah, at idle you will, just as with Ross' ECU, but the difference will be visible when lambda feedback is disabled, so when it's cold or when you are giving it some throttle.
Try to get Zeitronix logging set up and then doing a 2000 to 7000 rpm pull in 3rd as well, along with posting the results.

[Sonic]

Will do after the weekend - the OH will literally kill me if i'm doing that all the way up to Cumbria

She was filled with the fear of God when the car was stock

[prj]

I hope she starts to boost after you change the cams and wg...
Otherwise it is likely the turbo will have to come off, as JP said.

First verify that the altitude sensor is okay though.

[Sonic]

Yeah, i know

If that's the case i think i'll have it down at Rich's (Poole) rather than up at Rich's (Cumbria). Be tempted by one of those other turbo's then

[Sonic]

Well now that feels a bit better (just stopped in at tesco on the way up north)

[prj]

Still doesn't boost 1.8 bar though, right?

[Sonic]

Not tried but I doubt it - the oh was flapping at .5!

[newsh]

Nearly 3 years since this thread was started, just lately its been the first one I look for every time I log in..

Andy it would be really easy to disconnect the hose from the WG and block the end with a 1/4" extension bar and jubillee clip. Give it some in 3rd gear, keep an eye on the boost gauge, it should easily give 1.8 Bar. If it does boost ok that would point to a boost control problem rather than a basic hardware problem.
Are you still using the MAC valve? My coupe would not give correct boost on these and I tried 2 different ones, I had to change back to a stock N75.