Misc-ura

i was told that rims affect how much power you actually put to the floor. like different rims will change your dyno numbers for the same car. why does it happen is it weight or diameter? also does anyone know the weight of the OEM 18'' v6 rims?

KillerG

lighter wheels = less weight that the engine has to rotate to move the mass of the car


you will definitely feel faster on your feet with lighter wheels

Misc-ura

you feel faster but does it actually make a difference?

Misc-ura

also does offset change acceleration and handling or is just for looks?

ed_423

i don't think offset changes those thing

like killer said, lighter wheels = better performance. look at all the track wheels ppl run

also, a while back mroto changed his gtc01 back to stock and he noted about the lightness and performance gain from his car

its rayden

offset will effect handling since you are effectively changing the suspension geometry. i'm not sure HOW it will effect it and by how much. i'm sure a few mm won't make a noticeable difference, but you don't want to push it out too much.

PyroDave

as said, lighter wheels = faster. not sure by how much, but simple logic.

therefore diameter matters. 18's are considered the best as a tradeoff for accel/handling to looks. at 19 the increase in loss of traction is more substantial. this is a good read

http://www.caranddriver.com/features...sted-tech_dept

KillerG

that c/d is perfect, and the exact article i was thinking about

it should be noted that their weight doesnt vary by much between 18/19, but if you went with lightweight wheels you would definitely feel a diff if you shaved like 8 pounds off each wheel

and it would be a real differece as well

justnspace

iTrader: (1)

^its called rotating mass.


also, a wider tire will allow a bigger contact patch. more rubber to the ground = better power delivery.


I'm running 255/40/17 on stock TL rims

Misc-ura

oh awesome article thanks guys this helps explain alot I was going to go for 19s but i dream of smashing 335s one day so ill stick with some light weight 18s hahaha

justnspace

iTrader: (1)

yikes....i dont think you can smash 335s.

maybe G35s.

Misc-ura

one day man one day lol im still a little confused as far as offset is concerned sorry for the newb questions lol but does offset really matter for our cars or is it just for looks? Im just curious if its possible to reduce understeer with a low offset. I love my baby but man when I push her hard she never wants to listen lol

justnspace

iTrader: (1)

^nah, short of forced induction, 220whp will never beat 335's.

a wider tire will help torque steer. I'm running a STICKY SUMMER tire in a 255/40/17 configuration.

Misc-ura

oh i have a v6 btw i have 230whp stock hoping to get up to about 260-270whp the new n55 engine(2010+ 335i) only puts downaround 260whp so i think i can stand a chance

justnspace

iTrader: (1)

look into pre-cat-deletes, jpipe, and catback...
this will get you into the ball park of 240-260whp.

also, an RSB will help induce oversteer.
Grab some wide sticky summer tires!


you'll also want to lighten your car.
light weight wheels being the best bang for the buck...less rotating mass.
since the car is a entry level luxury vehicle, there are lots of weights and dampers...REMOVE THEM.
Racing brake 2 piece rotors!!!!!! = less rotating mass.

Misc-ura

lol... dont think all those mods will only give me +10whp bro
then again it depends on the dyno too but yea i have looked into it man a 40whp increase isnt an impossible goal me thinks lol but back to suspension will lets say a +35 offset vs the stock +53 help me with the understeer problem? My friend who has tuned an s2k and an evo told me to install like a rear sway bar to force the car to oversteer but i really dont think this car will ever oversteer with a 62/38 weight distribution

justnspace

iTrader: (1)

my 3.2l is making the same wheel horsepower as your 3.5l. stock for stock.

I've modded my 3.2.
I've dyno'd.

you will not beat 335's.


Rim offset:
http://www.wheelsnext.com/content/wheel_tech.html
http://www.tirerack.com/wheels/tech/...jsp?techid=101
http://blog.tirerack.com/blog/rim-offset

PyroDave

i remembered reading that article like a month or two ago, thought i saw it on this site, but i looked for it and couldn't find it after 15min. then i went to google. i forgot it was car and driver. spent about 15 min googling and clicking links for it. i remembered it teaching me a lot so i thought it'd be helpful haha

justn, he's already contacting a place in socal about a sport exhaust system. that is you doing that right misc? good luck against the 335 =P i fuck around with them on the highway. me and my friend fucked around, he has a manual 2010 135i. could EASILY burn me, but im a smarter driver lmao. so i beat him, he got stuck at a red light =D

offset wise, i assume being flush would be the best, but don't take my word for it. wider wheel base should be better logically. poking out doesn't look good, atleast for me, and its probably not good for aerodynamics. if your dropped(which improves handling, make sure your fenders are rolled if your too low and your stanced, so you don't rub or whatever)

anyway misc, you should join the vortex blue club, look at my sig hahaha. i dunno what number we're up to though lmao

PyroDave

search this forum for the rear sway bar, its seemed to have helped ALOT with the handling. i wish i could put it on my car. really just read through some of the threads on here/ search the the forum. there should be a good amount of info that'll answer most of your questions. this is where i've learned everything i know

justnspace

iTrader: (1)

since the 3.5 in the TSX is the same as the type-s TL.....
it wont be much different as far as gains.
260-270whp fully bolted on.

still not enough to beat 335's.
I believe the 335's are lighter than you.

you're at a hefty 3600lbs.
I'm at around 3400lbs.

*edit* just read that 335's are around 3600lbs as well.

Misc-ura

Thanks pyro thats alot of help ill check out that stuff i just have trouble finding stuff on the cu4 so i thought i would ask haha initially i was trying to find out what the stock rims weight hahaha but this turned into a huge thing hahaha
and justn catback +10 jpipe+12 cai+10 precatdelete+12 according to manufacturers thats 42total if i cant beat 335s i sure as hell will stick with them bc most are middle aged fat dudes who dont tune and if for some magical force I cant stick with them Ill pass them when they're on the side of the road because of a fuel pump malfunction lol

justnspace

iTrader: (1)

Horsepower doesnt work like that...
you're not adding horsepower, you're freeing up the exhaust gasses.

I recommend dropping weight.
there are tons of weights and dampers throughout your whole car. Remove them.

Misc- I also recommend reading everything in the 3G TL section. both TL-S and TSX share the same 3.5L engine. you can learn a lot by checking out what we have done on the TL side.

Misc-ura

i'll take a look bro thanks.

justnspace

iTrader: (1)

In conclusion, a wide sticky tire, and an RSB will help out with torque steer and understeer.

the light weight rims are only there to help you lose rotating mass.

KillerG

if i use less wheel bolts, can i make my car go faster?

im thinking like 2 bolts per wheel

justnspace

iTrader: (1)

lighter = faster.

6spdTLman

my rims make my car slow as shit , kinda looking foward to throwing the stockies on soon.

ttk5

i dont see how you can beat a 335 without boost or some sort of ECU tuning. Pulling out the backseats makes a HUGE difference..the weight savings from that alone makes a noticeable difference even when daily driving. I say do all the bolt ons you can and shave weight. every pound counts.

TLer trash

Should be just fine, I've seen real race cars with just one!

ed_423

^ shall try that tonight!

ed_423

op, if you REALLY want to beat 335i...take out rear seat, front passenger seat, speakers, radio, spare tire, add SUPER light weight wheels, good tires. maybe a carbon hood/trunk. shave off useless plastics and what not, and go run around the track everyday.

then those 335 got nothing on yo ass!

Misc-ura

Lmao not worth it for now im content with smashing none "s" audis haha

Aman

Au contraire, Justin, a wider tire doesn't mean a bigger contact patch. Contact patch area is determined by weight and tire pressure, nothing to do with width. I think the advantage of wider tire comes from the shape of the contact patch, or how the tire deforms under force.

Wider tires usually are better, but they don't give you a bigger contact patch.

its rayden

how can a wider tire NOT give you a wider contact patch if weight and tire pressure is constant?

Aman

The shape of the contact patch changes. Wider, but not as "long".