What would cause A/F to rise?
Thread Starter
On The Tree
Joined: Oct 2003
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What would cause A/F to rise? Had some tuning done a couple of weeks ago and when I left the shop I was nailing a good 11.5-12.0 under boost. For some reason in the last two days it's increased to 12.5-13.5 under boost (well, the two times I did it to verify, now I'm off the boost until I get it back to the shop).
My question is, what could cause it? The weather here has gone from @ mid 70's to low 90's in that time, could that cause it?
Thanks much!
My question is, what could cause it? The weather here has gone from @ mid 70's to low 90's in that time, could that cause it?
Thanks much!
How much boost are you running? Are you running an intercooler? What exactly is your setup and situation? You're definetly lean, put there's a million things that could cause you to get lean. Heat, more boost, lack of fuel, heat soaking etc. etc.
Bad, did you verify those first A/F #'s on the street or on the dyno??? If it was on the dyno, then that could very well be your problem. Also if the temp has gone up and its leaner, then check your corrections for fuel vs IAT temp. As for it being more boost it could be possible if your boost controller is acting up. Check the connection from the controller to the top port on the gate. Also check that none of the vacuum lines are pinched or ballooning with heat.
Jose
Jose
Thread Starter
On The Tree
Joined: Oct 2003
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Sorry for the lack of details 
It's an STS turbo with FMIC, fuel pump, 42# injectors, comp 918 springs. I'm running 7# of boost. This was on the street, monitoring A/F with an AEM wideband gauge... I don't know how accurate they are but better than the standard A/F gauge?
Temps have increased here by about 15o, but last night it was pretty cool and I had the same issue. The last thing to be installed was the pump about a week ago or so, and it was hitting a solid 11.8 (on the street) after it went in, it just seems to have started acting up in the last couple of days.
I called my tuner and it's going in on Monday (better safe than sorry!) but I'd like to learn as I go as well, so I'll check my controller connections and vacuum lines.
Quick question... I'm using a Turbosmart e-Boost installed in one of my AC vents. A couple of nights ago it was in the 90's so I drove to work with my AC on, when I got there the gauge had some serious condensation on it. It operates fine (no glitches in the digital display, all the buttons work, etc) but is it possible the water may have done something to it? I just remembered the condensation, but I brushed it off thinking the unit would be sealed anyway and it's a fairly common location for gauges... worth pulling and checking out or probably a far fetched notion?
Thanks for the replies, I ordered the Maximum Boost book so hopefully I won't be asking questions forever
It's an STS turbo with FMIC, fuel pump, 42# injectors, comp 918 springs. I'm running 7# of boost. This was on the street, monitoring A/F with an AEM wideband gauge... I don't know how accurate they are but better than the standard A/F gauge?
Temps have increased here by about 15o, but last night it was pretty cool and I had the same issue. The last thing to be installed was the pump about a week ago or so, and it was hitting a solid 11.8 (on the street) after it went in, it just seems to have started acting up in the last couple of days.
I called my tuner and it's going in on Monday (better safe than sorry!) but I'd like to learn as I go as well, so I'll check my controller connections and vacuum lines.
Quick question... I'm using a Turbosmart e-Boost installed in one of my AC vents. A couple of nights ago it was in the 90's so I drove to work with my AC on, when I got there the gauge had some serious condensation on it. It operates fine (no glitches in the digital display, all the buttons work, etc) but is it possible the water may have done something to it? I just remembered the condensation, but I brushed it off thinking the unit would be sealed anyway and it's a fairly common location for gauges... worth pulling and checking out or probably a far fetched notion?
Thanks for the replies, I ordered the Maximum Boost book so hopefully I won't be asking questions forever
