I'm just looking for some opinions on my readings. I just put in my new TT chip, and at idle my o2's are between 500 and 600. If I crank the fuel pressure they won't go any higher, but if I lower it they drop as I go. The chip is set up for 25 psi, and I had the boost at about 13 psi the readings at full throttle were around 780. It should be running totally rich. The cross counts are cycling from 0 up about every 5 seconds. The chip has the fast sm update. I had similar readings with my Denso and my Delco o2, but they are both from last season. Any ideas? Thanks
o2 readings
- Thread starter dvernst
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Go off BLM for idle. I would not worry about the o2's at idle...
On the WOT issue..I had the same worry but with my car the o2's are 780-790 wether I run 10 PSI or 22 PSI WOT. I guess the chip compensates? I wouldnt worry about it unless it is lean at the boost you want to run.
My $0.02 Jason
On the WOT issue..I had the same worry but with my car the o2's are 780-790 wether I run 10 PSI or 22 PSI WOT. I guess the chip compensates? I wouldnt worry about it unless it is lean at the boost you want to run.
My $0.02 Jason
Darkside8889
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Your O2's are suppost to swing around a certian point when out of PE mode. I forgot exactly what the value was, but it corresponds to stoich (14.7 AFR). A BLM of 140 means your ECM is adding fuel to get it to stay swinging around that value at idle to achieve a 14.7 AFR.
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Low egt, and gas volume at idle will slew readings..
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You should ask Eric for sure, but I think his chips idle in a kind of open loop. He has orchestrated several data points in the chip for best idle as well as WOT. At idle I believe he has kept some things functioning, like the BLM data.
Send him an E-mail. He will clear it up for you. Check your fuel pressure about 45 PSI with the vacuum line off.
Send him an E-mail. He will clear it up for you. Check your fuel pressure about 45 PSI with the vacuum line off.
Thanks Guys. Eric said if it is running o.k. it should probably be o.k. I just have to keep a close eye on it when I start turning up the boost, which I would be doing anyway. I'm going to try a new o2 sensor. if it doesn't change i'm not that worried about it.
