1950StangJump$
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I have a 2008 GT with the Stage 1 Kenne Bell, CAI, Kooks headers, high flow cats. Since 2009, it has had the canned, Kenne Bell tune. I bought it about a year ago, and it always ran well. Came with a dyno sheet, but it was ripped for an HP reading (by the SC installer) and not custom tuned. There was no wideband bung and no air/fuel gauge.
But, given the headers and CAI, I decided to play it safe and have it dyno tuned. A bung was installed, and the HP came in very close to the canned tune, but I was able to clearly see a safe air/fuel ratio. At WOT, it started about 12:1 at 3000 RPMs and quickly dropped to 11.8:1 and down to 11.6:1 as the RPMs climbed. Mostly hovered in the 11.7 or 11.8 range. Perfect, IMO.
Problem is, the dyno tune kind of sucks at light throttle and low RPMs -- especially when the car is cold. It is very sluggish. When I switch back to the canned Kenne Bell tune, that problem goes away. But, I now have the wideband sensor with an Aeroforce gauge which I didn't last time I used the Kenne Bell tune. So, I can now see the air/fuel ratio at WOT starts at 12.5:1 and never gets below 12.2:1. It mostly hovers around 12:3:1. From what I read, that is too lean.
So, my choices:
1. Contact Kenne Bell to see if they have a tune update? If this tune is from 2009, perhaps they have changed it? Or, could the headers be making that tune run lean because it was intended for stock manifolds? I *think* the CAI came with the Kenne Bell kit, so I doubt that is changing anything.
2. Contact my dyno tuner to try and fix the light throttle sluggishness? Problem here, I have no faith that he'll have much patience in dialing in the tune for light throttle drivability. My experience is that most dyno tuners are worried about safely making full throttle power. Plus, it is a PITA to get my car to him because he is so far away.
3. Go with Lito? Problem here, I am not looking forward to all the datalogging or with paying for a tune a second time.
Opinions?
But, given the headers and CAI, I decided to play it safe and have it dyno tuned. A bung was installed, and the HP came in very close to the canned tune, but I was able to clearly see a safe air/fuel ratio. At WOT, it started about 12:1 at 3000 RPMs and quickly dropped to 11.8:1 and down to 11.6:1 as the RPMs climbed. Mostly hovered in the 11.7 or 11.8 range. Perfect, IMO.
Problem is, the dyno tune kind of sucks at light throttle and low RPMs -- especially when the car is cold. It is very sluggish. When I switch back to the canned Kenne Bell tune, that problem goes away. But, I now have the wideband sensor with an Aeroforce gauge which I didn't last time I used the Kenne Bell tune. So, I can now see the air/fuel ratio at WOT starts at 12.5:1 and never gets below 12.2:1. It mostly hovers around 12:3:1. From what I read, that is too lean.
So, my choices:
1. Contact Kenne Bell to see if they have a tune update? If this tune is from 2009, perhaps they have changed it? Or, could the headers be making that tune run lean because it was intended for stock manifolds? I *think* the CAI came with the Kenne Bell kit, so I doubt that is changing anything.
2. Contact my dyno tuner to try and fix the light throttle sluggishness? Problem here, I have no faith that he'll have much patience in dialing in the tune for light throttle drivability. My experience is that most dyno tuners are worried about safely making full throttle power. Plus, it is a PITA to get my car to him because he is so far away.
3. Go with Lito? Problem here, I am not looking forward to all the datalogging or with paying for a tune a second time.
Opinions?