I experienced this with my Acura's. Their engines seemed to break in at around 10K gaining some torque and horsepower. My 350 IS appears to me to have done the same. I didn't notice it on my 385hp Genesis but then again that engine was divine from the get go. Anyone notice that their engine seems smoother and stronger?
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I'm about 9k miles. I experienced surge in power right around 8k miles but then I went back to normal feeling around 9k. I wasn't sure if it was related to break-in or just different batch of gas in the tank.
Glad to hear that I'm not alone and not just imagining it. @ic350 -- you can lay that 335i power dream to rest for a while. But take the IS through some twisties hard and you'll totally get why I'm jazzed about this car. Also, 18mpg is about what I get -- but to be fair -- I'm never in eco and always in sport or sport+ -- or at least a lot of the time.
IS350 AWD here. Just rolled past 1100 miles, and I'm averaging 23.4 on my work commute, which is 90% highway and about 21 miles each way. I'm loving the handling and performance so far. This is driving in "normal" mode, which is pretty damn responsive to me.
2014 IS350 AWD Starfire Pearl/Parchment
2013 Camaro 2SS/RS Summit White/Black- gone but not forgotten.
Also coming from a 335i here. The new car is amazing in many ways: it's sharp, it's gorgeous, and the interior is on-point, but one thing it falls short on is the engine... The whine, the weak torque, and not really getting any mpg worth writing home about - those are the things most people can live with. But this is definitely not the car for someone who's had a turbo car before as you get spoiled by that for life unless you replace it with another turbo car, or a V8.
But more on topic, the car does get a bit smoother over time. Another trick not many know of is, when you downshift, let go off the gas completely before pulling that paddle. It'll downshift smoothly and actually faster too.
this power surge which everyone is referring to may be plausible as the car ages. i know that mpgs gets better as you hit 10k, 20k, 30k, 40k, and starts to even out there. this could also be true too to the power. on the other hand one could theorize that its about consistent experiences. so for instance your first few thousand miles i'm sure you rationalized that you needed to baby the hell out of the car.. in the spirit of whatever moment, you had a weakness and floored it WOT. you got that good boost going through your veins but stopped and didn't do it too many times. but each time you did floored it, and as mileage increases you felt that there is this power surge revelation. keep doing it often and the same theory will apply where things will start to even out. so in a nut shell, you didn't do it a lot before so you didn't notice, but do it more often and you see this unforeseen power, not do it so much that it becomes for a lack of better word no longer as life changing. you got used to the power essentially.
My is350 is doing better mileage and the engine runs smoother after 10,000 kilometers. I use to average hardly 5kms/liter on city driving. Now i can easily do 6.5kms/liter on city driving. Have not driven it lately on the highway. Hopefully it can go over 10kms/liter.