19" Wheels to heavy for MK6 Stock brakes?

[kujiwara]

Re: 19" Wheels to heavy for MK6 Stock brakes?

You are way to high here Jerry, more like 1lb of weigh is 2-3 lbs on the chassis. You would have to have most of the weight in the tire and very little in the rim to get a 1500% difference. Of course where the weight is makes a bigger of difference, the design of the rim does make a difference. I do notice a difference on the ACR between 19" street pigs and the 16" track tires but that would probably be blamed half on the weigh difference and half on where the weight is 23.5" diameter vs 25.7 inch. diameter.

Here is a good calculator that has all the math. For calculating rotational inertia and acceleration.

MAT PROCESS: Shaping by the MAT process reduces wheel weight by 10%-15%. Every pound of unsprung weight savings has the effect of reducing overall vehicle weight by 20lbs.

Reference
http://enkei.com/shop/racing/rpf1/

[RedRayne_GTI]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Did you clean you 19" summers on the car after you did the swap? If so you may just have temporarily contaminated the pads.

It was actually on the way to the car wash after installing that I felt it. So no, they hadn't been washed yet.

I was out today and didn't feel anything, so maybe it was just post install, 5mins down the road, suspension settling back and things just felt wonky.

Thanks for all the replies!

[bobkatkat]

Re: 19" Wheels to heavy for MK6 Stock brakes?

MAT PROCESS: Shaping by the MAT process reduces wheel weight by 10%-15%. Every pound of unsprung weight savings has the effect of reducing overall vehicle weight by 20lbs.

Reference
http://enkei.com/shop/racing/rpf1/

Wow I like your math! So if my track 16's weigh 38lbs and my street 19's weigh 53lbs, I am adding or taking away effectively 1200lbs!!! Damn Why do I waste so much money on CF. Real world more like 100-140 lbs penalty for running the 19's.

[kujiwara]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Wow I like your math! So if my track 16's weigh 38lbs and my street 19's weigh 53lbs, I am adding or taking away effectively 1200lbs!!! Damn Why do I waste so much money on CF. Real world more like 100-140 lbs penalty for running the 19's.

I don't know, I'm just saying my 15lbs thing didn't come nowhere, and I would believe in enkei but I think this is somewhat flawed because it should also be dependent on the engine output like I've said earlier, but for most street cars I guess enkei is probably right

[onceover]

Re: 19" Wheels to heavy for MK6 Stock brakes?

There's a lot more to it than just how much weight is added. Where the weight is on the wheel will have a huge impact. The closer to the center of rotation the less the forces increase. 15lbs is probably some average that enkei found from some arbitrary test.

[MechEngg]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Jerry you should know that weight placement is everything in this situation, you took dynamics in first year engineering right? You know the sum on the moments and sum of the forces must each equal zero right?

[flipstah]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Surprised this thread went two pages without asking for pics.

[MechEngg]

Re: 19" Wheels to heavy for MK6 Stock brakes?

In for pics of the wheels for sure :P

[T-Dubbs]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Picssssss

[RedRayne_GTI]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Surprised this thread went two pages without asking for pics.

[P Arkus]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Is it sad that I know exactly which episode and part that girl is from? Nah fvck that, its awesome!

[Geobmx4life]

Re: 19" Wheels to heavy for MK6 Stock brakes?

My dog likes ice cream...

[flipstah]

Re: 19" Wheels to heavy for MK6 Stock brakes?

Touche.

I expected this,



You should come by the monthly meets. I'm sure a lot of the guys will teach you about wheel rotational inertia.

[Kg810]

Re: 19" Wheels to heavy for MK6 Stock brakes?

hahaha