forum.audiv8.com Foren English Audi V8 Forum Megasquirt 4.2 ABH V8

Hi Everyone,
I am fitting my Audi 4.2l ABH v8 in my kitcar. The ecu I am using is a Megasquirt MS1 V3 using wasted spark and a 36-1 trigger wheel on the front pulley.
I am using 2 ford coil packs.
Has anyone done something similar?
Does anyone know what the ignition advance settings are?

I have set the wasted spark pairs as:
1 - 6
5 - 3
4 - 7
8 - 2

The engine fires but backfires through the inlet manifold and out of the exhaust, so something is wrong. I have a great spark and fuel
Any help would be awesome as I am going crazy trying to get this started!
[image]http://s509.photobucket.com/albums/s334/nickt_v12/?action=view&current=DSC_6603_zps93b66a05.jpg[/image]

Do you set the firing order right?

1-5-4-8-6-3-7-2

Yes, I hope so, with wasted spark you fire 2 cylinders together.
So you fire the cylinder on compression and exhaust together. I have set the advance at 10 degs btdc, but I have no idea if its right or what the fuelling should be set to.

Moin Nick,
I think the firering order would fit, but what´s about the fuel injection?
Normally the injektion valves are paired, maybe you have to switch them alone, that´s perhabs the problem. It can be also a timing problem of ignition and injection.

I'm firing the injectors in 2 batches, left and right bank. 4 squirts per cycle, so there is plenty of fuel.
I need to know the ignition advance settings. I need to know someone who has put a Megasquirt on a V8 .

HI Nick,

have you talked to the people at v8@audifans.com? That could be worth a try...

Regards

Bastian

Hi Bastian
No, I haven't heard of them!
The mark on the front pulley, I assume that is TDC cylinder 1?

Do you think it is worth copying this to the German forum? Someone, somewhere must have done this before.

Let it try...

I make the translator, ok?

Aha - i see someone else has fallen for the trick timing mark.

It's for #5 TDC. Knowing that earlier would have saved ME about three weeks.

Hi - I know thise are a old post, but I hope you still read the forum. How are your prosject?

I have just converted a similar engine in my Audi 80 prosject,with microsquirt V3, simmilar to megasquirt 2. Using, Edis-8, ford coils, GM MAP / TPS / CTS / AIT and L-2 Inovate lamdasonde.

Have you or anyone else got a good running msq / fuel- and ignition tables to share?

Hi Petter, the project is fine. I have the engine running perfectly. the ABH is dead and I now have a 3.7 AEW, same engine just smaller.
If you goto www.madmechanics,com, and contact me through the Zonda buildf story in the build forum I can send you the MSQ I am using.. The engine is really really sweet

Cheers

Nick

Hi Nick - I have sendt you a PM on the madmechanics.

Petter

For N/A I can give you some values from the original motronic.
At WOT 6000RPM you have ~24°, in part load (low) ~33°.
Idle at 10° works ok.
For the beginning this should work.

Why is the engine dead?

the pistons melted into the sides of the bores and the engine went BANG! its on youtube http://youtu.be/ID5D728VGyw

The previous owner of the car had run it without water I think and melted the insides. The new AEW is perfect, I have just changed all the valve stem seals, and am doing a cambelt change. Hopefully I will get its started today.

Ahh. You didn't opened the engine?
Turbo with stock CR? Oha :-D

Do you have pictures of the damage?
Melted piston is normally a lean mixture or a lot of knocking.
Without water it's more or less a seized piston.

Such much white smoke?

yes, lots! and bangs, the pistons melted into the block

Your description sounds not realistic to me!

If a block went dry, maybe the pistons melt to the cylinder - then you never will run the engine again... and why the white smoke?

More reasonable seems to me, headgasket damage -> water in oil and/or combustion chambers (white smoke) -> not enough lubrication -> piston damage.

Well, I know how it works with a dry block in front... 7 Years ago... 50km, including traffic jam (half an hour in Zurich rush hour) and highway (120km/h and more) and at the last 10km a intensive inclination... replaced a hose, filled in coolantwater - it runs till bevore i come from work... 110tkm later...