IMO, you're just use to the power. The low rpm power delivery in these cars can be a little flakey on occasion. Some days the car is snappy, some days it's not. Historically, VQs get stronger with age. I had a VQ30DE in my Maxima and that car got faster as time went on. I sold the car with 117K miles and it still ran perfectly.

What kind of gas mileage are you seeing and what's your driving style (ie aggressive, mostly city, mostly highway, hilly, etc).

 

i agree with comment above.. your used to your cars power..i bought my G at 61k stock and it was great. besides G35 are awd which mean they are great at launching. so if you compared that to a rwd, that could also be why you feel difference when gassing..i know cause i also drive a 325 xi..

 

I'm getting approx. 20 mpg which is mostly highway, but traffic sometimes since it is L.A. I do agree that some days it's snappy & but most days it's not.

 

Don't forget that your ECU adjusts to your style of driving. If you drive it aggressively a lot (like the loaner vehicles) you might get some of that fun back.

 

There is your reason right there.

The ECU absolutely adapts to your driving habits.

If you drive it like a Grandma, the ECU will eventually create a performance map for Grandma's specifications. (Higher efficiency, reduced performance)

If you drive it like a stolen rental car or a dealership loaner, it will richen up the A/F ratio and advance the spark timing.

Drive your car like you were pissed off and the ECU will do the same.

 

You have an 05 coupe with the DE engine. Your loner was was a 07 sedan with the HR motor. The HR engine has more power than the DE engine.

When I had an 07 sedan as a loner, it sure did feel faster. Felt nice. Much better than my 05.

 

ya get on it a little bit and see how she feels. let us know if you notice any changes in perceived performance.

my '05 AT sedan is at 59xxx miles right now and I've just done a few basic 60k things. Swapped the rear differential fluid (smelled like someone physically took a dump inside of the rear diff), flushed tranny fluid, spark plugs, and am going to flush the coolant next. Still runnin' strong and still love to drive it hard.

I'm surprised too, i bought my G in march of this yr with 37k miles and have put 22k on it in a little over 6 months have had zero complaints thus far, love the G!

 

After I changed software in ecu back in 1993 on my 90 Q45 I took it to quarter mile and recorded some accelerations with a stopwatch.
These base lines allow me to check with just a stopwatch a simple 50> 80 mph acceleration locked in 2nd gear. The 5.3 seconds has NOT changed 0.1 seconds in 274,000 miles except when it needed plugs or injectors as long a temperature or elevation hasn't changed significantly in each test.

The difference between ATL at 1,000 AMSL and sealevel Tampa at the same temperature is ~~3.3% power output resulting in a 1.5% change in acceleration just at a tenth [0.085 seconds].

When GA switched to E10 18 months ago I noticed it immediately increased the time by 0.1-0.2 seconds depending on different tankfuls. Results of less btu per gallon!

Dynos are useful but not as much as a known stopwatch or quarter mile.

 

Damn! I also bought mine in March this year and only put 7k on it. Glad to see you are enjoying the G!

 

I tend to think your butt dyno is getting bored. I threw it on a dyno to confirm...it was putting out exactly the power it was supposed to.

Going FI fixed that for me LOL.

 

Single turbo time.