True in theory but in automotive reality not so much, both friction and aerodynamics are real.

 

anyone know if the front lip is different from coupe to sedan? i think the bumpers are different but the guy said they are the same lips for both. id hate to buy it and not fit. thanks

 

Yes but as long as tire diameter remains constant, those wont really change based on the wheel diameter.

I agree with you that a larger inertia will reduce fuel economy. It does take a bit more energy to get it moving, and then that energy is wasted when you hit your brakes. But once at speed, it shouldnt make much difference at any. So it would be different for someone with mostly highway driving vs. city

Additionally, I dont think that it makes enough of a difference to affect wheel diameter selection. Maybe if you are a hyper miler. Going for a lower tire width or lower rolling resistance would be much more effective methinks.

 

What kind of lip? Maybe if it only goes under the bumper, and not around the sides of it. Show pic.

 

I'm almost certain they are different.

PM one of the body kit vendors, they should be able to tell you for sure.

 

That means it will kill the mpg of the car the larger wheels are going on. MPG while rolling is always going to be high since it takes very little power to keep something moving at a constant speed and less power to accelerate something that is already moving than it does to start moving something that is standing still.

 

Accelerating from a stop is what kills your average MPG, that is why you will always get more MPG if you drive freeways more. Accelerating from a roll or maintaining a constant speed doesn't matter as much. Adding heavier wheels means you need to put down more power to get your car moving, which really kills MPG.

 

It will hurt the MPG, but so does driving a car as heavy as ours in the first place, getting 18s vs 20s wont cause massive changes in mpg. Dont forget you also have to accelerate our fat 3400 lb chassis+driving weight + driveshaft rotation + brake rotation + tire rotation + driver weight. The wheel diameter wont make or break your mpg. Small changes, sure, but if you really want good mpg, you have the wrong car.

I understand why highway mpg is better than city mpg lol, I already said that. Everything is rolling, the car has momentum, all thats required is to keep it rolling.

Anyways I fully agree that it will affect city mpg, not very much though.

Shouldnt affect highway mpg

 

they are different, thanks though

 

Just out of curiousity since I will be lowering my sedan in the near future; how much lower does the car get using the 350z suspension?


Yea I love the way the TL looks especially that gen, I hate the way the new gen looks with that big@$$ power ranger looking shield on the front. Everything about the '04 TL I liked, from headlights, tail lights, exhaust tips, interior. What killed it for me was the FWD, if only it came in SH-AWD like the newer gen. Besides the round headlights of the G35 grew on me and now I kinda like them.


Wow finally a response, I'm surprised you even found my comment since it's so far back haha. Anyway good to know, so that means I can put HID's in there and have them at full power when I apply the highbeams as long as I have my fogs on at all times? (Don't worry I'll be modifying the shield to prevent glare when the fogs are on).


I'd be surprised if they were the same since the coupe is wider than the sedan by 2.5 inches.

 

I am pretty confused by your post -

1. " Anyway good to know, so that means I can put HID's in there" - in where?
2. "and have them at full power " - What do you mean? Nobody runs HIDs at half power
3. "when I apply the highbeams as long as I have my fogs on at all times" - a. design dictates that fogs automatically turn off when high beams are turned on (fogs hurt distance vision)
- b. Why would you have your fogs on at all times.
4. "(Don't worry I'll be modifying the shield to prevent glare when the fogs are on)." - Im not sure which shield you are referring to, we have reflectors not projectors.

 

how much should 05-06 trunk lights be? somebody selling them to me for $150 is this a good deal?

 

The reverse lights you mean? If so, way overpriced IMHO

 

yes, how much do you think they should be priced?

 

Sorry for the confusion.

1. I'm trying to put HID's in the fog light / high beam housing.

2. What I meant here was when I turn on the high beams I would like them to be at full power and I know HID's take a while to reach full power which is why they aren't recommended for high beam application. BUT if I keep the foglights on then the HID's will be running at full power when I apply the high beams right? (< I believe that answered 3b)

4. I'm refering to the same shield that is in our HID reflector housing for our low beams that prevent glare. I'm assuming that our fog light housing has a shield that comes on and off since it does turn into a high beam some how.

I hope that clears everything up!!