MembersPage/BenNesbitt/FuelPage (2005-10-02 07:33:17)

Fuel Page for MembersPage/BenNesbitt

sequential fuel delivery for 8 cylinder Audi engine

firing order: 1-5-4-8-6-3-7-2

Bosch fuel pump in the 80/90 is the same part# as A8 and I think fuel pressure is around 2.5 bar (?)

Injectors are stock A8 units with the idle vacuum port plugged but I plan to upgrade to 400cc Delphi in the near future

Did you flow them? My A8 injectors were 200cc@4bar.

that is awful, no wonder they run out of steam with an exhaust and intake :P

Ok, here are the latest panels from megatune that result in the motor starting and idling for a few seconds. Any throttle input kills it and the idle basically just tapers down to nothing after starting... So like I guess the fuel delivery is not happening.

I am going to go hog wild on the megatune site to figure these out but feel free to add your ideas:

Until your new ECM with 8 flyback arrives :

fuel1.jpg

This shouldn't matter and is really a wild guess, but change it anyway, set injpwmDC (%) to 100%.

After doing so and making sure that it has been saved in the ECU you need to go to the terminal and type Manmcd, in the output you'll have to find the injpwm=FF (what you just chnaged) and verify that it's really says FF. The real reason of the excercise is to check that the injpwmt=FF that should be right above it also says FF.

To make it easier for us to verify the config it would be great if you ran Manmcd and pasted the output in a wiki page. -Jörgen'

''Here is the output from Manmcd. I changed the injector divider to 1 and the injpwm to 100% and the engine fired right up and idled (WOWOW!)Of course it does not like any throttle input and Megatune ALWAYS crashed as soon as the engine starts.

Any channel you leave enabled (like misc1out_channel ), or misconfigured might trick you, especially if it's directed at a driver used for ign or inj.

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fuel2.jpg

fuel3.jpg

fuel4.jpg

fuel5.jpg

fuel6.jpg

fuel7.jpg

fuel8.jpg

fuel9.jpg