S4_4MY30'S

and if you do, you've got a leak somewhere...i'd stop driving the car if i were you..READ..VERY VERY DANGEROUS!
where's the location of that secondary fuel pump? i have mine right near the cabin air filter and the one time i smelt fumes inside the cabin is when i had a leaky connection that i fixed right away.
Good luck,

Ray D.
90 G60 Tornado Red
00 S4 Silver/Onyx

Ah10@WMS

Sir, you've got mail!

PSmalls::DoggieStyle

Cool, glad you noted an improvement.

X - 1 _ r a c e r

I put in 4% Ch2 and 3% Ch10 and 1.5* Ch9. I logged it on the way to work today and had virtually no CFs! O2s ran up to .88 (fat, cool), timing was APR/91, 2-6*, CFs on #2 and #5 were 2.25, the rest 0. I think I'll throw another degree into it and see what happens.

PSmalls::DoggieStyle

Holy crap, that's some really conservative code! Keep adding timing (and fuel) and see what happens.

Mike2kS4

It's an additive trim which affects idle pretty profoundly if you tweak it low enough (60% in my experience) But it's just an offset number (Linear) not multiplicative (Like Primary fueling which is multiplied by load, it seems).

Say you're fueling 5 g/s at idle. You need .35 or so grams of fuel to maintain that. Say, -10% of that is -.035, that brings you down to .315. This could make a significant difference at idle, but by subtracting that .035 from say WOT of 330g/s you go from 23.57g/s of fuel to 23.535... Not much of a difference at all.

I've charted .01 O2 variations with tweaking secondary but that required so much pulled that idle suffered. AND that may have been off anyhow due to narrowband limitations.<ul><li><a href="https://forums.audiworld.com/s4/msgs/2082621.phtml">https://forums.audiworld.com/s4/msgs/2082621.phtml</a</li></ul>

Mike2kS4

Then you should set your primary as it was before and PULL secondary to help your fuel economy.

Mike2kS4

How's your project coming along? Look me up if you run into any problems.

[badmoon]

I'm wondering if this would be a good idea for me when I'm already lean at idle after adding 10.2% to primary to clean up WOT

Mike2kS4

You really should get your primary set for maximum power first. Then tweak your secondary. I'd think you can take 20% off without many issues. Just log after every change and go in small increments.

WOT should remain where you set primary, roughly. Your cold start and part throttle will be affected if you pull too much though. The cold start is the only thing you can't compensate for with the other channels.