Car manuals say: "Don't let your engine run idle for long"

[Zenmervolt]

Many are, yes. I've got a handy little Dashhawk that shows me AFR information and it's a *little* rich, around 13.8 or so, but the car will switch to closed-loop after it warms up and increase the AFR to around 15.0 after a few minutes.

How to tell when you're used to tuning a turbo car:

You see a 15:1 A/F ratio and the gut reaction is, "SHUT IT DOWN NOW!"

15:1 is fine for steady-state cruise with low loads on the engine, but it's hard to kick the habit of tuning under boost at WOT. Last dyno run I was hitting ~13.2:1 at redline and maintaining ~12.3:1 from about 3,000 RPM to 5,500 RPM and I considered that to be on the edge of being too lean.

ZV

 

[JCH13]

How to tell when you're used to tuning a turbo car:

You see a 15:1 A/F ratio and the gut reaction is, "SHUT IT DOWN NOW!"

15:1 is fine for steady-state cruise with low loads on the engine, but it's hard to kick the habit of tuning under boost at WOT. Last dyno run I was hitting ~13.2:1 at redline and maintaining ~12.3:1 from about 3,000 RPM to 5,500 RPM and I considered that to be on the edge of being too lean.

ZV

HAH 13.2 at redline... so lean... My MS3 is in the 10s and 9s during WOT. I'm amazed it doesn't launch more fireballs...

 

[jlee]

HAH 13.2 at redline... so lean... My MS3 is in the 10s and 9s during WOT. I'm amazed it doesn't launch more fireballs...

It will after you burn your cats up.

My FXT is right around 11.0 - 11.1 at WOT. Gotta hook the wideband up to the MR2...guaranteed that's in the 10's...