Engine Breaking and Flat Lean AFR, Normal?
 

Hello all,

I have a habit leaving things in gear while decel, where you can used engine to slow down the car and no throttle.

Now, the Wideband tells me when I do this, the AFR is flat lean, is this ok to do then?

Thanks, car is a converted TII

under engine breaking there is no fuel being delivered so that would be normal.

I am having some puzzles to figure out. Now, say, the SAFC is connected to the boost sensor, since it is a S4, at high rpm, how the computer know that, there is no throttle which leads to no fuel?

for the S4 if you wire the TPS from the SAFCII into the MAP sensor it will read like a normal wideband TPS system?

no shitty throttleness?

my guess is that since the SAFC compinsates in % and 0 fuel is being delivered that your fine. also every EFI car does this so i also assume that they make the SAFC knowing this.

1. I wouldn't worry about it.
2. You're not supposed to engine brake, unless you think your brakes might fail on a long mountain road. Brake pads are cheaper than your clutch/engine, etc. All student drivers in Great Britain learn "Gears to go, brakes to slow." Or so some Great Britain-ite claimed.

Hmmm.... as far I know or used to, Japanese teaches to leave it in gear all time ...

I think the MAP for a NA S4 is the Boost Sensor for a TII, I am correct?

None of my pals leave it in gear, I never take it out(ony to shift).

I think it is safer to leave it in gear because what if someone looses control and comes flying at your driverside door. You might have that extra second to get out of the way.

Yes, I like the control. What about Auto-X? People got to leave it in gear, right?