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- 4.2l - V8 models (https://www.audiforum.ca/4-2l-v8-models-90/)

- - running rich (https://www.audiforum.ca/4-2l-v8-models-90/running-rich-66101/)

just curious if anyone knows if the v8 runs alittle more rich than your avg engine

Re: running rich

I believe so. See the thread below yours https://www.audiforum.ca/4-2l-v8-mod...ock-b7-s4.html

Re: running rich

yeah stock tune pushes into the 14s as far as AFR goes. That's traditionally pretty rich. It's Audi being conservative. It's also **** for making power.

13.0 is optimal. That's (not surprisingly) what the JHM tune does. 'Other' tunes that shall remain nameless push the car into dangerously lean territory. Fail.

Re: running rich

Quote:

Originally Posted by sakimano (Post 167962)

Interesting comment on "Other Tunes".

Re: running rich

Quote:

Originally Posted by sakimano (Post 167962)

Huh? 14 is 'leaner' than 13. And it's far from ideal to have a constant AFR, i.e., 13.0:1, throughout the entire power-band.

Quote:

Originally Posted by mikeh (Post 167965)

Interesting comment on "Other Tunes".

Agreed - I'd like to hear what tunes. I don't know anything about 4.2L tunes, but usually tunes are rather conservative in their AFRs, and its their timing/VE/boost/other maps that suffer from lack of refinement. Most tuners steer well clear of stoichiometric, since they won't last long in the biz if people are grenading engines every time it's hot outside :shock: