I understand the difference in weight, but a few extra kilos in a heavy car is going to be barely noticble. I certainly didn't notice the difference in mine on the road or track, other than they are much better with reduced fade. The positives certainly outweigh any negatives.

Very clever!

I'm sure if this "unsprung" weight was a problem VW wouldn't have fitted them to the R32/Cupra and the S3. Never hear any complaints from the owners of these cars about too heavy brakes?

Thats why they fitted the cupra, TT and S3 with lighter lower control arms to cancel out the extra weight of the discs/calipers :p

So yes, it was a problem, but they had a solution for it

I'm sure if this "unsprung" weight was a problem VW wouldn't have fitted them to the R32/Cupra and the S3. Never hear any complaints from the owners of these cars about too heavy brakes?

Cost for the first two? The fact that most Audi drivers can't drive - so irrelevant - probably the alloy lower arms 2kg opposed to 4kg of unsprung is a factor too?

Longevity and maintaince costs are another

Looks over function is as discussed above by others is tge main reason - driven with fashion dictating >17 inch wheels making more than adequate rotors look inadequate.

Take a look at the standard set up on an insignia vxr - v expensive but half weight of standard rotors

The weight part only really comes into play with cornering / steering feel.

Personally 312 is plenty big and 18 alloys are an inch too big for optimum 'feel' - a nice set of 17x7.5 speedlines with two piece rotors and decent pads would do just nicely (plus tt lower arms just to finish it off)

 

from the mkvgolfgti forum

OEM:

GTI 312mm - 15.6 kg

TT-S 340mm - 20 kg

S3/R32 345mm - 21.5 kg

TT-RS 370mm - 17 kg

RS4/RS6 365mm - 17 kg

RS6 V10 390mm - 21.5 kg

Non OEM:

AP Racing 330x28mm - 10.6 kg

VW-R 352x32mm - 12 kg

K-Sport 356x32mm - 12.25 kg

Brembo 355x32mm - 13 kg

Thanks for that, interesting numbers!

Thanks for that, interesting numbers!

Sad I know

Thats why they fitted the cupra, TT and S3 with lighter lower control arms to cancel out the extra weight of the discs/calipers :p

So yes, it was a problem, but they had a solution for it

I know the TT has aluminium control arms (been looking for a set), but didnt know the S3 had them and are you sure that the cupra has them? Also what about the R32 does that have the aluminium arms aswell?

vRSy, Fair play i stand corrected fella the cupra does come with the aluminium arms aswell as does the R32. TT has adjustable ball joints and thats the old difference as far as i can see.

Aren't the S3 hubs also lighter?

Aren't the S3 hubs also lighter?

Yea they are mate. Aluminium again

Thats pretty normal on new pads/discs. Just takes a few miles to bed them in.

There aren't new though, covered approx' 8k prior to removal from the donor car, although I suspect they will still need to bed in after refitting? I took the car for a blast today and (on a private road) did a few 100 > 30 stomps, first impression, my god it stops. When I got home I checked and a little bit more of the disc is showing contact, I would say I'm up to 65-70% coverage now!

Does anyone know the price of the arms and part number for the Cupra ones? Are they a direct fit?

Aren't the S3 hubs also lighter?

Approx 3kg v 4.5kg for hubs and sensors.

Not sure but think they give a wider track though? Which may mess up track / track rod ends on standard?

There aren't new though, covered approx' 8k prior to removal from the donor car, although I suspect they will still need to bed in after refitting? I took the car for a blast today and (on a private road) did a few 100 > 30 stomps, first impression, my god it stops. When I got home I checked and a little bit more of the disc is showing contact, I would say I'm up to 65-70% coverage now!

New pads on second hand disks? might be lucky but better to have them skimmed a little.

Does anyone know the price of the arms and part number for the Cupra ones? Are they a direct fit?

The cupra, S3 and TT arms are a direct fit, but its pointless fitting the S3 and cupra arms IMO because they aare still fixed for camber adjustment.

The TT arms however have adjustable camber so aremuch Ore value for money with much more grip on tap

Bedtime reading

http://www.golfmkv.com/forums/showthread.php?t=136174

Nah, thats full of yanks saying sick!! at every post. Hate that forum with a passion.

The mk5GTi forum is much better

Threads >>here<<

1- Lower control arm

Amount required=2 total, 1 per side

Part number=8J0 407 151 D(same part number for each side)

Total cost= 224 euro for the pair

2- Bolt to attach lower arm(dont know exact name for it)

Amount required= 2 total, 1 per side

Part Number=N 101 410 03

Total cost= 5 euro, (2.50Each)

3- Ball Joints

Amount required= 2 total, 1 per side

Part number= 8J0 407 365(LEFT SIDE), 8J0 407 366(RIGHT SIDE)

Total cost= 92 euro (41 euro each)

4- Ball Joint bolts

Amount required= 6 total, (3 per side)

Part Number= N103 320 02

Total Cost= 2.64 euro (44 cent each)

5- Ball Joint Lock Plates

amount required= 2 total, 1 each side

Part number= 8J0 407 175 (176)

Total Cost= they didnt charge for these????

In total it came to 323 euros+19%tax, so 385 euros total inclusive of VAT

Approx 3kg v 4.5kg for hubs and sensors.

Not sure but think they give a wider track though? Which may mess up track / track rod ends on standard?

3mm extra track each side - so can't see any issues

New pads on second hand disks? might be lucky but better to have them skimmed a little.

No mate, the complete set up was removed from a 8k car, all parts fitted left the factory fitted.

I have ordered the Cupra set up for mine. Won't have to paint the calipers as they come in red.

Nah, thats full of yanks saying sick!! at every post. Hate that forum with a passion.

Totally agree, some on there are very arrogant. There was a thread on there once about dyno figures. There were members qouting figures from their KO3 turbo's that were in KO4 territory. I made a comment about the figures being a little optomistic and the abuse i got, I was called an idiot and that i knew nothing even though i've lots of experience with the engine. I let them at it so they could live in Alice and wonderland :p

Edited 7 January, 201214 yr by Micky 32

Totally agree, some on there are very arrogant. There was a thread on there once about dyno figures. There were members qouting figures from their KO3 turbo's that were in KO4 territory. I made a comment about the figures being a little optomistic and the abuse i got, I was called an idiot and that i knew nothing even though i've lots of experience with the engine. I let them at it so they could live in Alice and wonderland :p

yanks arrogant?.... agree much better link provided!

more useless info - brembo manufactued 312mm = 8.4kg 345mm = 12.1kg.

doesnt sound much but when you factor it up as rotational mass (rule of thumb x5) on both sides its 37kg equivalent weight increase.

two piece non floating rotors / hats are about 40% lighter so roughly 3.4kg saving using a 312mm or 34kg lighter over standard - circa 70kg over a big braked car (a passenger difference)

(note the above is very simplified regarding rotating weights etc)

I mailed compbrake to see if they also did a two piece rear, but no response :(

I mailed compbrake to see if they also did a two piece rear, but no response :(

Their email response is rubbish - best to give them a call.

They do definately do them. A few people will poo poo the quality saying go brembo etc but they are half the price and can't really see that big a difference.

No need to go semi floating etc by the way - cost is much higher for little gain really.

Godspeed are likely to do them too.

I mailed compbrake to see if they also did a two piece rear, but no response :(

From compbrake

VW Golf MK5 2003 on 312x25mm 2 PIECE DISC CONVERSION

Product Information

Cmb 0750    Golf Mk5 2003 on 2 piece disc conversion 312x25mm 315x25mm for standard Calipers. Due to the inherent warping problems associated with one piece discs we have produced a two piece solution by marrying two first class products - PowerVane Rotors & Compbrake Bells. * High Quality racing rotors by Power Vane. * HE 30 purposed designed aluminium bell. * Pre Torque fixing for direct replacement. * Brake fade virtually eliminated. * 40% weight reduction. * Faster heat dispersion. * Superior Performance Braking. * 4 gas vent design. * Long life wear rate. * Highly recommended for circuit racing & track days. * All top hat (bells) hard anodised in gold silver Black or blue to 50 microns. 2 piece discs the better option: * Superior stopping performance (shorter distances for stopping) * Improved resistance to fade over1 piece discs brakes. * Better resistance to water flooding (self-wiping) * High-torque development from a more compact and lighter package. * Efficient heat dissipation due to the open construction * Better performance in wet & dirty conditions, since disc brakes are self-cleansing; leads to more uniform braking action. * Greater performance stability throughout the pressure /temperature spectrum of the brake pad combination. * integrates with developing features of advanced electronic controls like ABS (Anti-lock Brake System) Bell to disc (rotor) fixings Mounting to rotor is done using 12.9 grade cap head screws with a plain shank, plated for protection to JS500 & stress relieved. Heat resistant cleaved locking nuts and plated washers. Supplied in sets of 16 & 24.

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