lean at idle, rich otherwise

[dboyle23]

So I have been tuning with ecuflash on my gsx, 660cc denso's.

I have been having a weird problem tuning.
At idle the AFR is 16-17. At cruise 11-12. I'm sure WOT would be less than 10, but I don't really want to try that.

No exhaust leaks except one big one right below the back seats. That wouldn't affect my AFR right? The Wideband is in the DP before the flex section.

Any ideas?

 

[LiquidX]

I'm sure you've heard it before, have you done a boost leak test?

The issue with the exhaust leak is it would lean out the whole range if the oxygen was getting to the sensor, not show a richer condition. It is plausible that during idle the exhaust pulses are small enough to get oxygen to the sensor from that hole so I would at least try a quick patch to see if your AFR changes.

Other than those 2, I would suspect possible tuning issues.