FiveLiterCheater

I'm trying to figure out why....I was scrolling through my old videos in one of my folders, and I found a video of my speedomter going from 60 to 110 in 3rd gear from a roll...it did it in a matter of seconds...now it seems to really struggle...it can barely do 100 unless I nail it for a while. Could it be my 19x9 lexions? Mackin said they weigh about 23lbs, and i'm running 245/35 tire, so it sits at the same height as my stock 17's. Got an oil change 2,350 miles ago.....cleaned my AEM filter a couple weeks ago (reverse vacuumed it;blew all the dirt outwards) One thing I did change was moving the temp sensor from the AEM pipe back to its original location, which helped my gas mileage a lot, but i'm pretty sure when I made that video, it was in the stock location as well. It can't be a weight issue, because I never leave anything in my trunk or backseats...hm....


any ideas?

BlkonBlkAc

Having a 245/35/19 will make the tire size 1/2" larger in diameter than the stock 235/45/17. When it says you are going 60, you are actually going 61. I don't know if this small difference would make it much slower... From 60-110, how much longer does it take now?

FiveLiterCheater

it struggles past 100 now

wasupdog

iTrader: (2)

it's your wheels. with the tires they are probably heavier than the stockies and any unsprung weight (more weight on the outside of the wheel vs. the stockies) is gonna kill acceleration. in addition, your wheels are 9" width vs. the 8" stockies so it's that, in addition to more weight on on the outside rim of the wheels.

it's not bad for the car but that's the tradeoff. to really keep performance u gotta have like some 18" lightweight expensive volks.

BlkonBlkAc

I don't know dude, either your wheels are doing it or something is wrong with the car if its having that hard of a time...

I know that a larger diameter will slow down acceleration but will 1/2" make that much of a difference?

BlkonBlkAc

Yeah, This sounds right. I didn't take into account the weight of the wheel + tire and the fact that it is a 9" wheel.

FiveLiterCheater

Yeah, but I still didn't think they would cause that much of a problem...oh well lol

3rdGenHybrid

how many miles are on your car? my A/T felt slugish off the line...changed the Tranny fluid...it was black....flushed it...seems fine now...but most of it is probably your rims....

FiveLiterCheater

I have about 30k on it right now, maybe i should change the tranny fluid then

darksom1

What about that lil thing you did a minute ago? When you revved it up too high racing the M3 and the EVO and it cutoff? Think that did something? Didn't you have to take it in?

road_boy

iTrader: (1)

Not sure if this is true but i heard for every pound you add to the wheel its like putting 60lbs of weight in the vehecle. So the size and weight of the rims is most definately adding strain!

FiveLiterCheater

But they weight less than the stock wheels....

Dark, i didn't take it in for that....couldn't think of a valid excuse for telling them the car tops out at 130mph lolol

Texas

http://www.escortradar.com/gtimer.htm

ussi

iTrader: (1)

thats odd, i don't think your wheels could make that much of an impact. with larger wheels you'll notice a bit of sluggishness at all speeds. when i put my 20's on i felt minimal difference on the top end, but slower off the line. if you're going through the effort of cleaning the filter, etc, might just want to throw your stock rims on when you get a chance and see if you notice a difference - that way you'll know for sure

dragncivic

a bigger wheel effects your low end power and acceleration, not your top end once your up and moving inertia keeps your car accelerating at high end... but my car is 6sp and with stock wheels and feels not as fast either....

FiveLiterCheater

I'll make another video...lol

3rd gear pull from 60mph

onsknth

You need to go up against a tree/gun... My thought... Your ass is getting used to the car, it's feeling slower because you do it too much.

Ever come off a hiway after a long trip going 75-80 for miles on end... Feels like death if you hit a sidestreet right away only going 30. Another example... I started snowmobiling years ago on a 340cc sled that felt like it would throw me at any moment, probably no more than 20HP making it to ground. Over the years I bought larger and larger displacement machines... Today minimum 900/1000cc and anything less than 155HP feels doggy, yet I still eat just about anyone on the lake.

darksom1

Hella good point!

EndofFile

Weather conditions play a HUGE role in your car's performance. Colder weather = more dense air = better combustion. Hot weather = the opposite. Just to give you an idea, I had a 350z before this. I took it to the track when it was bone stock and ran a best of 13.72@103. 2 months later and still stock, I ran 13.9@101. First time, it was 35 degrees out with 0 humidity, second time it was 70 degrees and humid. Ive had my TL since the winter and the difference in performance of it in winter vs now is like day and night.

FiveLiterCheater

Yeah, I guess it is because its warming up outside...doh

722ish

If the tire on the larger wheel is taller, youve changed your gearing. If not, i would consider the larger wheel to move the rotating weight away from the hubs, maybe simulates load a little harder and flashes your Torque Converter. Automatics are tough, with a manual it can only be so many things! Try with some smaller wheels if you can, and see if it reverses the process. Maybe even HEAVIER smaller wheels. The rotating weight wont really be that much a detriment rolling. The acual tire diameter size influences gearing, and that would be more an issue.

Good luck

Mark

mr.motoring

It doesn't matter if your bigger rims are lighter than the OEM wheels, because the light weight is more offset by the fact that rotating a drum with the main part of the mass further away from the center requires more effort. In this case, upgrading to 19's has moved the mass 1 inch farther from the hub. When you're cruising, having 30's wouldn't hurt at all, but once you step on the gas (at any speed), the added requirement in torque comes into play.

Here's an analogy: Lightweight pulleys and flywheels

What happens when you install these in your car? You can rev (accelerate/decelerate) the engine a lot quicker from any RPM speed. Yes, they are lighter than the OEM pieces, but they also aren't larger in diameter either. Plus, using underdrive lighter accessory pulleys frees even more power. Same goes with your wheels.

That's the price to pay for plus sizing your rims AND widening your tires. Better looks AND grip at the expense of performance.

geekybiker

Meh. At higher speed rotational inertia makes very little difference. He's not accelerating fast enough overall at those speeds. At that point a couple extra pounds on the wheels is the same as a couple extra pounds elsewhere in the car. First couple gears when you are accelerating alot quicker rotational inertia plays a much bigger part.

3rdGenHybrid

i think the TL is a slow car period....i mean dont get me wrong...i love my tl....but it lacks balls....oh...and when i talk about the tranny fluid being changed...its for the A/T......preferably every 15k...

FiveLiterCheater

I don't think its "slow"...i've been in way slower cars lol Its no race car though....I'll look into getting my tranny fluid changed...but I havent since i've had that car. Is that why it holds gears so long when it shifts in SS mode?

Inaccurate

No. I use Mobil1 Synthetic trans fluid which makes the tranny shift with much less clutch (clutch pack) slippage. But, the lag in SS is still the same as before. You can feel the gear engages quicker and firmer once it does decides to shift because there is less slippage (Acura's attempt to produce soft luxury feel ).