Hi.
on the RD 1.8
I am tuning up to 15psi. and have been logging the afr on the stock narrow band and on a Wideband.
Both are cyling about 0.6 AFR up and down at around twice per second when at Crusing speed (ie no boost)
I replaced the Narrow Band sensor and no real change.
At Light trottle at High RPM you can feel the car slightly surge up and down as well

it looks like a cyclic wave on the logging screen. (like an ocean swell )

I have never logged a AFR So not sure if its normal operation.
Has anyone got some logging at crusing speed, and observed it?

Thanks

 

It's normal. I dont have a log of it just cruising but this has some steady rpm bits.

You can see the 02 just bounces around:



P.S. Get some pics up so we can see your boosted 1.8L

 

Thanks , and great to hear its not a fault.

As for the Pics, Comming soon.
Cheers

 

is this with the FIC? if you want you can shut the closed-loop operation to have total control of the AFR (I forgot though if the FIC can do this)