1783 replies to this topic

[JG]

Et voila!

 

 

The discs are actually stamped Pagid (found it now), but i guess anyone could stamp it for them

[JG]

weight comparison. 

 

Astra GSi 308 discs, with a little wear (negligible):

 

Plans bell, 308 disc

 

 

[Goosenka]

Mr Gumby question moment but what other benefits apart from weight?

[Wolfstone]

I'm missing pics of your car on grass James.  

[JG]

Mr Gumby question moment but what other benefits apart from weight?

 

Aluminium isn't a very good heat conductor, so less heat from the disc is transferred to wheel and hub. 

 

The wheel and hub have a significant mass (around 10Kg depending upon wheels, and front or back) and store heat which takes a long time to cool. If you can keep the heat in the disc it will cool (and heat up) much faster. 

 

Thats the theory. The reality, is that a 3Kg unsprung mass is a nice saving and its a bit of bling

[JG]

I'm missing pics of your car on grass James.  

 

i'll get you one soon. 

 

 

Though the neighbours builder has taken my patch of grass outside the front of the house.

[JG]

Thought there was little doubt, I'm pleased they fit fine

[chris_uk]

they the right way round? which way are the internal channels going?

Edited by chris_uk, 26 January 2014 - 10:29 AM.

[vocky]

they do look nice mr JG 

 

but not sure I want to spend so much to lose 3 Kg 

 

well maybe one day I might 

Edited by vocky, 26 January 2014 - 10:36 AM.

[Gedi]

Can you remember what the weight of the original 288 discs were? I seem to remember it being in this thread but I'm not going back through 76 pages

 

Surely the 288's weigh less than the 308's with ali bells, especially if you throw in the weight of the larger calliper. Which would mean the only advantage over standard brakes is the bling

[JG]

They are the right way round

 

Neil, not as expensive as a full on AP solution. Total cost is around £370

 

Gedi, orignal 288s weigh 7.7kg

http://www.vx220.org...sk-weight-info/

 

so these are a 1.2kg saving on a standard disc despite being larger

[Ormes]

FYI In terms of the right way round for the J Hooks... when fitting mine I spent ages researching to ensure they were on the right way... I found an AP racing fact sheet that proved that the way the hooks are facing were correct... and they are the same way as JG's.  I have however seen them facing that way and the other way on a number of cars including Britcar and GT racers.  Guess therefore that it doesn't matter too much.  I know you were talking more about the veins than the J Hooks but thought it may be of interest anyway

[JG]

Do rotors need to be bedded in carefully? or can i go to stowe in a week and just abuse them?

[Gedi]

You're supposed to bed them in. ~1000 miles of careful driving, pretty much the exact opposite of going to stowe

[Ormes]

...and the complete opposite of how you bed pads in, which generally get changed when you get new rotors

[CocoPops]

You're supposed to bed them in. ~1000 miles of careful driving, pretty much the exact opposite of going to stowe

1000miles?!?

 

He'd never bed them in before retiring them.

[JG]

1000 miles So I'll be ready in 2025 then! Seriously that can't be right

[JG]

...and the complete opposite of how you bed pads in, which generally get changed when you get new rotors

I'm sticking to my current pads which I've ran over a glass sanding surface. I'll change to new pads after stowe

[JG]

http://wiki.seloc.org/a/Bedding_discs 100 is more like it, can bed them in on the way there

[Gedi]

Sorry that was a typo, I was meant to say ~100

 

http://www.apracing....73&ProductID=30