s2000Junky

Stock wideband? Not sure I understand what your implying there, as there is no wideband accessible to monitor stock ( at least on the 00-05 cable cars) But that aside, a solid stand alone wideband is an excellent way to tune the car, its much more accurate then the tail sniffer at the dyno. All ive done is rely on my AEM wideband to street tune my FI and NA set ups over the last 12 years owning this car. In my experience, every dyno sniffer that is properly functioning and getting a consistent read at our tail pipe( which doesnt always happen) they read .5 leaner then actual. The actual being the 02 sensor from the wideband up at the Test pipe or right after the merge collector if no TP, which is the proper accurate reading location for tuning the engine. The good tuners that want a solid and accurate reading typically will not use their sniffer at all, but remove your wideband sensor and put in theirs to effectively duplicate your own on board wideband set up.

s2000Junky

For the best engine efficiency you should follow suit on how OEM cars are tuned from the factory, which is 14.7 at idle and partial throttle up to a point. On the S2000 we see 14.7 afr up to about 25% throttle opening and light load up to -5 to -6 vacuum, at which point from there to 0 vac OEM adds fuel to target about 13.5afr. This in my experience offers the best performance and economy on a boosted s2k or not. From there add fuel appropriately for your set up once in boost.

The pics above look very good. I dont see any white peppering or blistering from leaning/hot spots or detonation from running too lean. I see very much a tune that i described above, which is a stoich/14.7 idle and partial throttle tune with good amount of fueling under load/boost based on the dark deposits. This is probably as close to a proper textbook tuned boosted s2k engine there is. Its a shame its being pulled apart and modified with some risk of that changing. But some people just cant leave there shit alone. I can certainly relate

The only thing I would suggest on your next tune, is to really make sure the tuner spends a proper amount of time tuning the fuel from the -5 to boost transition point, so your not either running too lean or too rich there. Being turbo you have some variable with boost lag and throttle/load positions, so it requires special attention over just a WOT or idle tune.

MorngWoodStewie

The flashpro users can, No disagrees on the latter, couldn't say it better myself. But a good dyno tuner knows all that and is compensating for the difference with the sniffer and if /usually has another wb in place in proper area to also go off. I'n my exact position tho. I'm saying my tuner pulled plugs just to make sure, because primary oem O2 was reading 10's up top in boost and sniffer was reading good and that was all we had. And after reading HONDATAs research and also seeing they implemented a AF correction value in their software; I don't believe the primary oem O2 sensor is sufficient to shoot from the hip on especially with a FI application, that is all.

I agree his head looks fine, and wanted to make sure he had "extra" readings confirming AF's which is the OP topic.

Jaspah

Thanks