Stock ECU Wideband Readings

[2KGTS]

The O2s are very new in my GT-S. The injectors, not so much. *Laugh* The car DOES have 212,000 miles on it, after all.

Anyway, I got the AEM UEGO temporarily installed ('til I figure out a more permanent mount) and drove it a while. I got the following readings:

Cold Idle: 12.2 @ 1700rpm, 14.6-15.1 @ 1500rpm

Warm Idle: 14.6-14.9 @ 850rpm

Part Throttle: 14.6-15.2

Full Throttle: 11.6@4500rpm, 11.0@8000rpm - normally low 11s throughout with an occasional flash as low as 10.6!

The full throttle numbers are very interesting to me. I just thought I'd post them up for reference/comment.

[Bitter]

sounds normal. it's installed just before the Cat in the nice fat pipe yea?

[2KGTS]

Yep.

I understand they may be there by the mfr to remain safe. But I can't believe someone who can tune their A/F would go for those WOT targets, for instance.

[Bitter]

you can lean that out to around 13-13.5:1 at WOT depending on how knock looks and what timing you're running. Goal is to keep knock low, AFR stable, and timing...timing is fun. Sometimes more is better and sometimes less is better, it's interesting. There is no flat rule for timing, its not simply advance till knock then retard. That's the more interesting variable to play with, AFR is easy for the most part.

[Magusownz]

I see these exact air fuel ratios on my car when I run stock ecu.

[kortik]

well 11.8 in lift is maybe rich for n/a but for turbo is fine

[zzt231 gr]

well 11.8 in lift is maybe rich for n/a but for turbo is fine

Υeah.The car must be stock,right?

[2KGTS]

Yep, she's stock. And yes, I would think leaning out WOT should get more power down. I hope to put on the PowerFC tomorrow. Then the real fun begins.

[zzt231 gr]

hope to put on the PowerFC tomorrow. Then the real fun begins.
Yeah baby!!

[Smaay]

yeah with a PFC yo ucan lean that out and gain about 10HP. WAAAY back in our days we made something like 192HP to the wheels with PFC tuning and CAI and TRD exhaust

[2KGTS]

yeah with a PFC yo ucan lean that out and gain about 10HP. WAAAY back in our days we made something like 192HP to the wheels with PFC tuning and CAI and TRD exhaust

The JDM version of the GT-S was rated 190hp, as I recall. Not sure if any other markets got them that way.

[Smaay]

yeah and in JDM they have 96 octane gas

[2KGTS]

And we now have e85 :D

[Bitter]

yeah and in JDM they have 96 octane gas

They measure octane different.

Difference between RON and AKI

Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel.

96 RON would be like 91 R+M/2 here in the states ;) My Geo Prizm manual confused me, till I realized that they were stating my octane requirement in RON not PON, so there I was figuring how many gallons regular to mix with how many gallons premium to get 91 octane till I realized that it was 91 RON which is 87 PON. :gap:

[2KGTS]

They measure octane different.



96 RON would be like 91 R+M/2 here in the states ;) My Geo Prizm manual confused me, till I realized that they were stating my octane requirement in RON not PON, so there I was figuring how many gallons regular to mix with how many gallons premium to get 91 octane till I realized that it was 91 RON which is 87 PON. :gap:

Damn, I forgot about that! Good catch. There was a thread about just this long ago on this site... damn I've been here a long time. *Laugh*