Im putting 19x9.5s on my TC and was wondering if anyone has put on a similer size noticed any loss in power? If so enough to condsider a different size?

 

really depends on how heavy they are...

 

Weight and overall rotating mass are what is going to affect power..the width shouldn't have a lot to do with it.

The power loss will be negligible at most..if any at all.

 

hell yeah its gona be slower. rotating mass / gearing will be affected. and probably the 19 " wheel will be heavy too... so to answer your ?... if u wana be fast your doing it wrong. but if u wana be slow then your doing it right.

 

I should only be gaining a couple of pounds per wheel, it seems the last two statemens some what contradict. I would like to hear from someone that has the same set up to find out exactly how their car felt before and after the rims, and if it made them regret their choice.

 

Pete is right, increasing weight and rotating mass will make the car feel slower as there is more wheel there for the car to have to turn in order to make the same speed...

 

I figured there would be some difference .. Heavier shoes harder to run... But I would like some first hand input to get an idea of exactly what I should expect. Thanks for the input so far!!

 

Since I'm on this wheel tire kick today....a 19x9.5 wheel with a 235/35/19 tire has an almost identical rolling diameter to the stock 225/45/18 it's only a .87% increase. So depending on the weight of the wheel it shouldn't make any difference in gearing/ performance. There are plenty of 19s lighter than the stocks. But I'm just going off info from tire bible and common sense, please correct me if I'm wrong

 

1. you generally wanna keep the same rolling diameter in order to keep your speedometer readings/ABS and stability control calibrations intact.

2. so if you follow #1, which you should. the only difference is weight. Wheels/tires are unsprung weight aka at the bottom of the shock/spring and always touching the ground.
for every % increase/decrease in the overall unsprung weight the end result is % increase/decrease in the car total weight feel.
for example:
if your total unsprung weight is 300lbs(tires/wheel/rotors/calipers etc)
then you get new forged rims and super light tires and cut that weight by 10% to 270lbs then the overall weight feel of the car will decrease by 10%
car total is roughly 3100lbs so it will feel as if the car lost 310lbs!
be careful cuz if you go the other way and increase unsprung weight with heavier wheels and spacers etc then it will feel like you have one BIG FAT MAN sleeping in the back seat

 

Exactly what are you trying to do?

Agree with TCpete 100%. If you are actually planning on doing any racing 19s are a no for the tC. If not and just want something to daily then go with what you like.

 

I think you should check you calculations on tire size according to 1010tires.com (where i ordered my tires hope they are right) they said theres a .85 difference on 245/35 and a 1.93 on a 235/35
As far as what im trying to do .. I wont be racing... Thanks for all the info!!

 

You're right the .87% i calculated was for 245/35/19 and its actually only a .85% increase in rolling diameter.....too many calculations for one day.