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Ok, will try to be clear on this so you all know where I am coming from. Got a few questions around tunes, tuning, drivability related items and looking for input/feedback from those that have tunes, have done some tuning, etc.
Anyway, background on the car: 2014 Impala LTZ Limited. I purchased it with about 8900 miles on it and now have right about 30,000 miles on it. Can has no engine/performance work other than the current tune. Here are the items I am looking for input on:
1. First gas mileage: prior to installing the tune, my DIC gas mileage was pretty close to gas mileage figured by hand at fill up. Usually within 1 mpg or so. Ever since installing the tune, the DIC is consistently showing about 3 mpg better gas mileage than figuring by hand at fill up. The hand figured number is almost identical to what it was prior to tune (on DIC and by hand). Just the DIC now is showing about 3 mpg higher. Tuner has no clue as to why and notes they don't mess with those conversions in the ECM. Thoughts?
2. Tranny/engine response: since the tune (and I have cleared TCM and done full load of tune), but at times when driving around town, like coming to a stop light or corner, where you slow down, almost stop, don't stop all the way, and then go to accelerate again, the car has noticeable delay/lag. Up to a second or so at times which can be a little disconcerting if traffic is coming! Used to have a Ford 500 that was like that and was resolved with an ECM update from Ford back them. When I clear the TCM and do the full reload of tune, it seems better again, but then comes back.
3. Tranny engagement: this has only happened once and was today, but was not what I want the car doing. Was accelerating, light throttle, up to highway speed. Got up to about 55 mph and backed off to maintain speed. Was kind of waiting for the feel to go in to 6th gear, but never felt it, and car started slowing down a bit. So, give it a loot gas and revs up, but doesn't speed up then tranny kind of slams in gear and goes. Kind of like it was slipping or in neutral then in gear all the sudden. Had never done that before and didn't again afterwards.
Car has not been beat on, never any transmission related type things prior to tune, and has always run well. Not trying to slam on this tune by any means, but I don't want to have to clear TCM and reload tune every time it acts up or something new comes along.
So, go. What do you guys think? Need any additional information from me to help clarify or discuss? Let me know what you think.
On a side note, going to drive a '15 Chevy SS tomorrow. In a dream world, the above issues would be no big deal as the SS would come home with me!
Actually, I would probably build the '16 SS I want if I got rid of the Impala!
Anyway, background on the car: 2014 Impala LTZ Limited. I purchased it with about 8900 miles on it and now have right about 30,000 miles on it. Can has no engine/performance work other than the current tune. Here are the items I am looking for input on:
1. First gas mileage: prior to installing the tune, my DIC gas mileage was pretty close to gas mileage figured by hand at fill up. Usually within 1 mpg or so. Ever since installing the tune, the DIC is consistently showing about 3 mpg better gas mileage than figuring by hand at fill up. The hand figured number is almost identical to what it was prior to tune (on DIC and by hand). Just the DIC now is showing about 3 mpg higher. Tuner has no clue as to why and notes they don't mess with those conversions in the ECM. Thoughts?
2. Tranny/engine response: since the tune (and I have cleared TCM and done full load of tune), but at times when driving around town, like coming to a stop light or corner, where you slow down, almost stop, don't stop all the way, and then go to accelerate again, the car has noticeable delay/lag. Up to a second or so at times which can be a little disconcerting if traffic is coming! Used to have a Ford 500 that was like that and was resolved with an ECM update from Ford back them. When I clear the TCM and do the full reload of tune, it seems better again, but then comes back.
3. Tranny engagement: this has only happened once and was today, but was not what I want the car doing. Was accelerating, light throttle, up to highway speed. Got up to about 55 mph and backed off to maintain speed. Was kind of waiting for the feel to go in to 6th gear, but never felt it, and car started slowing down a bit. So, give it a loot gas and revs up, but doesn't speed up then tranny kind of slams in gear and goes. Kind of like it was slipping or in neutral then in gear all the sudden. Had never done that before and didn't again afterwards.
Car has not been beat on, never any transmission related type things prior to tune, and has always run well. Not trying to slam on this tune by any means, but I don't want to have to clear TCM and reload tune every time it acts up or something new comes along.
So, go. What do you guys think? Need any additional information from me to help clarify or discuss? Let me know what you think.
On a side note, going to drive a '15 Chevy SS tomorrow. In a dream world, the above issues would be no big deal as the SS would come home with me!