Hi all!
I own a 2007 GT with a FRPP CAI, Steeda Billet Delete plates, Kooks LT headers, O/R X-pipe and Pypes SS exhaust. I'm using a Bama Tunes SCT X3 tuner with a 93 octane w/deletes tune. The car runs great, but I have a few questions:
1. On a cold startup the car will idle around 1500 rpm and drop down slowly over the course of a couple of minutes to 750 rpm. While it's at 1500 rpm it is VERY loud at the tailpipe, but it's almost as if something is closing after a few seconds and the sound quitens considerably. After it drops to 750 rpm I can push the throttle and take it back to 1500 rpm, but it is no where near as loud as it is on the initial cold-start idle(1500 rpm) after a cold start. Anyone have any ideas what is different between the cold start idle at 1500rpm, and throttle induced rev to 1500?
2. Seeing as I'm running the bama 93 octane w/deletes tune, should there be a noticable difference in power on cooler days? Where I live it has recently been dropping down into the high 50's/low 60's at night, and I can feel a noticeable increase in power while driving at these outside temps. Now, I know about colder air having a denser air charge, but wouldnt a colder incoming air charge cause the PCM to adjust accordingly due to the O2 sensors telling the PCM to adjust fuel delivery due to the change in burn with the colder, denser air??
Many thanks in advance to anyone who can shed some light on these questions.
I own a 2007 GT with a FRPP CAI, Steeda Billet Delete plates, Kooks LT headers, O/R X-pipe and Pypes SS exhaust. I'm using a Bama Tunes SCT X3 tuner with a 93 octane w/deletes tune. The car runs great, but I have a few questions:
1. On a cold startup the car will idle around 1500 rpm and drop down slowly over the course of a couple of minutes to 750 rpm. While it's at 1500 rpm it is VERY loud at the tailpipe, but it's almost as if something is closing after a few seconds and the sound quitens considerably. After it drops to 750 rpm I can push the throttle and take it back to 1500 rpm, but it is no where near as loud as it is on the initial cold-start idle(1500 rpm) after a cold start. Anyone have any ideas what is different between the cold start idle at 1500rpm, and throttle induced rev to 1500?
2. Seeing as I'm running the bama 93 octane w/deletes tune, should there be a noticable difference in power on cooler days? Where I live it has recently been dropping down into the high 50's/low 60's at night, and I can feel a noticeable increase in power while driving at these outside temps. Now, I know about colder air having a denser air charge, but wouldnt a colder incoming air charge cause the PCM to adjust accordingly due to the O2 sensors telling the PCM to adjust fuel delivery due to the change in burn with the colder, denser air??
Many thanks in advance to anyone who can shed some light on these questions.