Cheapest way to increase rotor size?

[LaCross]

Well this time has come for me to change my brakes as my rotor are pretty warped. I've been looking around to see what's out there as far as brake upgrades go, but i'd rather not spend a ton.

Out of all the aspects of this car Audi really seemed to neglect the brakes.

Does anybody know of a cheap way of increasing rotor diameter on this car? 345mm is a bit small considering the 3600lb weight. I don't think the caliper itself is really too much of an issue.

[B8 S4]

If you got bigger rotors you would need a bigger caliper also. Look at some of the big brake kits. I just ordered better pads, sta8nless steel lines, rotors, and racing fluid for my car and will see how that goes.

[s42014DSG]

What did you order and what was the cost FMI?

[DeltaHawk60]

Well, I honestly haven't tried anything yet myself, but I know there are various pills and creams that are advertised to "increase size" and have seen things like pumps and such. No idea if any of them even work, but can't say I've never been curious...

Wait..... misread subject.... scratch that!

[infinkc]

Rotor diameter wont do much if the stock piston can only clamp so much. You are probably better off swapping the calipers to sq5 ones and keep the same rotor size.

[B8 S4]

What did you order and what was the cost FMI?

Front and rear for all
EBC Yellow stuff pads -$300ish
Ecs slotted rotors - $400
Ss brake lines - $120
Torque RT700 fluid - $70

[R y an]

Front and rear for all
EBC Yellow stuff pads -$300ish
Ecs slotted rotors - $400
Ss brake lines - $120
Torque RT700 fluid - $70

Brake OEM upgrade $ well spent ^

[LaCross]

Is the q5 caliper upgrade worth the money? Not sure who has done this or what the pad difference is

[xpoweruk]

I went the Q5 Brembo route.
Dis some before & after 60-0 testing.The Q5 set up was around 0.2seconds quicker to stop.(testing done with P3Cars gauge)
Yellow stuff pads were used on both OE & Q5 set ups.

[paul]

by the way, the car's 3950-4100lbs not 3600

[LaCross]

It is 3637lbs

[LINDW4LL]

Is the q5 caliper upgrade worth the money? Not sure who has done this or what the pad difference is

Not in my opinion, but it depends what your goal is. There is no increase in heat capacity since you retain the stock rotors. There is an aesthetic benefit, along with better pedal feel/modulation and slightly more clamping force.

It is 3637lbs

That figure is not correct. I understand that it was posted as an official figure in the past. But the curb weight most recently listed by Audi was around 3850 which is in the ballpark.

A few people have weighed there cars on scales. Here is one I had saved. I've seen another @ 39xx, and two more which were just over 4,000. All without driver, of course.

[xpoweruk]

Not in my opinion, but it depends what your goal is. There is no increase in heat capacity since you retain the stock rotors. There is an aesthetic benefit, along with better pedal feel/modulation and slightly more clamping force.


That figure is not correct. I understand that it was posted as an official figure in the past. But the curb weight most recently listed by Audi was around 3850 which is in the ballpark.

A few people have weighed there cars on scales. Here is one I had saved. I've seen another @ 39xx, and two more which were just over 4,000. All without driver, of course.

What fuel level was that with ?

[LaCross]

Does anybody know of a bbk around $2k?

[paul]

I've also had my car on the scale, DSG, 1/2 tank of gas, full fluids, full interior, light weight wheels, between 4050 and 4100lbs.

[cspcrx]

my stock DSG 2012 S4 with about 1/3 of a tank and me in it, 170lbs, came in at 4182 on the track scale.

[LaCross]

Seems like the dsg figures are much heavier

[paul]

manual cars are ~3900lbs IIRC.

[Jay@JXB]

My 14 6MT with sport diff on 19" M510s came in at 3960 on a full tank no driver.

Sent from my VS986 using Tapatalk

[LINDW4LL]

I'd guess somewhere around 50 lbs extra for DSG over a manual based on other cars with DSG vs manual. Interestingly, Car and Driver noted that the Sports Differential adds ~40lbs to the weight in their first drive review. Seems like a lot, but I assume that info came straight from Audi.

[Victor Newman]

My MT, sport diff with carseat came up to 3950

[LaCross]

Alright so were settled at 3600lbs?

[xpoweruk]

My MT, sport diff with carseat came up to 3950

how much fuel please?

[xpoweruk]

These are taken from the UK brochure.

However the figures are for an S4 without any optional extras

Saloon

3637.627 lbs 6MT
3714.789 lbs Stronic


Avant

3758.882 lbs 6MT
3825.02 lbs Stronic

figures converted from Kg to Lbs

[RudyH]

Q5 calibers + some LW rotors, pads and stainless steel lines and you are good to go

I would consider going to a bigger rotor, and all the requirements as a major upgrade that will never be cheap.

Just going with LW rotors + pads made a difference. If I find a good deal on the calibers I think from a performance point of view I will be 100% done with the car.

[eurotic]

These are taken from the UK brochure.

However the figures are for an S4 without any optional extras

Saloon

3637.627 lbs 6MT
3714.789 lbs Stronic


Avant

3758.882 lbs 6MT
3825.02 lbs Stronic

figures converted from Kg to Lbs

I always thought that European weights were given without fluids in the car. Maybe that was just an urban legend.

For what year was that? Have you looked to see what the same published numbers for North America are?

[xpoweruk]

Those are the B8 numbers from the 2009 UK brochure
Only figures I have to hand