77TSI Brake rotor size and upgrade

[Racing Logic]

Does anyone know the size of the front and rear brake rotors on th MY12 Golf 77TSI? I have been offered a ful set of rotors and calipers from a MY11 GTI and want to know if its worth the hassle of the swap (not that its much work doing a few bolts) assuming that it bolts straight on.

[kaanage]

Check carefully before paying any money. A couple of regular 9N3 Polo owners have been caught out buying 9N3 GTi calipers and rotors and haven't been able to fit them because the caliper mounts are different.

The Golf Mk6's may all have the same mounts but check your car vs a GTi.

[Diesel_vert]

1.2 77 kW TSI: front 280 mm, rear 253 mm

2.0 155 kW TSI: front 312 mm, rear 282 mm

Assuming it's a straight fit, you'll also need to switch from from 15" to 16" wheels or larger.

...

If I may, I'd have thought big brakes would be a drag to carry around for a smaller motor like the 1.2 TSI in terms of unsprung weight (unlike a 2.0 GTI, which has enough power to compensate) and provide almost no gains in terms of performance 99.9% of the time (particularly if it's just the wife's car).

The reason being is that, in terms of stopping power, the tyres will be the main limiting factor on a car like that.

[Racing Logic]

Thanks for the tips guys.
Can anyone confirm the if the caliper mounts are the same on the 77TSI and a GTi?

The car will be getting some decent 18s, a tune for a bit more go and some H & R springs. If by upgrading the brakes I get just 1m improvement in braking that's worth it to me. 1m is a long way under the back of a truck!

[Diesel_vert]

The car will be getting some decent 18s, a tune for a bit more go and some H & R springs. If by upgrading the brakes I get just 1m improvement in braking that's worth it to me. 1m is a long way under the back of a truck!

Although big brakes increase the overall power of the braking system, it is unlikely you will overwhelm the current braking system of the 1.2 TSI on the road, so barring any significant brake fade issues, it's the tyres that will determine how quickly the car can decelerate.

Any reduction in stopping distances will mostly be down to your planned upgrade to 18" tyres, by virtue of their width and the type of compound used such sizes.

Having said that, 18" wheels, 18" tyres and GTI brakes are an awful amount of baggage for a 1.2 TSI in terms of unsprung weight.

Thanks for the tips guys.
Can anyone confirm the if the caliper mounts are the same on the 77TSI and a GTi?

For the fronts, the wheel bearing housing fitted to the 1.2 TSI has an integrated calliper carrier. It's different to the one fitted on the 2.0 GTI, where the calliper carrier is a separate part - so it's highly probable it won't be a straight forward bolt up.

On the other hand, the rears appear to be a straight forward bolt up.

Whatever the outcome, best of luck with the install.

[kaanage]

I fully agree with you, Diesel_vert, on the downsides of big brakes, wheels and tyres on low powered models but I've pretty much given up trying to persuade people here on the inadvisability of them (bad ride, slower acceleration, heavier fuel use, bigger tyre bills...)

Racing Logic, I find our MkVI has really grabby brakes which makes driving in traffic a hassle (I usually drive another car so I haven't adapted myself to it). Is the 1.2 more progressive?

[Diesel_vert]

I fully agree with you, Diesel_vert, on the downsides of big brakes, wheels and tyres on low powered models but I've pretty much given up trying to persuade people here on the inadvisability of them (bad ride, slower acceleration, heavier fuel use, bigger tyre bills...)

Well, a lot of modifications are done for reasons of aesthetics as well, so I guess it's each to their own.

You can certainly point out what the consequences are (positive and negative), but best to let them arrive at their own decision.

[Racing Logic]

Looks like better pads it is, then rotors when they need replacing. Cheers guys Love the info on forums.

[Digger11]

Looks like better pads it is, then rotors when they need replacing. Cheers guys Love the info on forums.

Why do you need better brakes on a 77tsi ?...

Are you planning to track it ?

[Diesel_vert]

Why do you need better brakes on a 77tsi ?...

Are you planning to track it ?

At the risk of putting words in mouth, I think it's more out of desire rather than necessity.

Well, at least his proposed mod has some sort of purpose (even if the benefit isn't great), unlike some of the more frivolous mods I often see!