MadUsa1

I've just ordered a set of Porsche brakes (the 355mm conversion from Powerstation).

Does anyone know if they will fit under 18 x 8.5 ET 53 Prodrive GT1's without spacers?

azzaharvey

iTrader: (10)

they'll be fine with gt1,
how have you managed to buy them from powerstation??? i got fed up with chasing them. i rang 3 times over a couple of months each time they said theres none in stock we'll sort some out and ring you back. iam still waiting for 3 phones calls back off them, so went for 355 ap's instead

MadUsa1

Thanks for the feedback.

I didn't buy them from powerstation, I found a second hand set on here.

However, I'm sure Godspeed can make a custom setup using the same Porsche 6 pot calipers.

MadUsa1

Just to confirm - will they fit without spacers??

johnnybon

iTrader: (70)

Yes they do
Without spacers

MadUsa1

Thanks, but those aren't prodrive GT1 wheels :-)

Your set up looks awesome though, happy with it?

Anyone have GT1s and the Porsche kit??

johnnybon

iTrader: (70)

They are prodrive though haven't had a chance to use in anger yet can you see my mistake ?

2pot

iTrader: (3)

Does this help?
http://forums.nasioc.com/forums/show....php?t=2057536

Or this:

https://www.scoobynet.com/showthread...=948610&page=2

MadUsa1

nope, what mistake?

MadUsa1

Thanks, I saw those as well, but neither link really answers the question.

I did wonder if the NAISOC post was about the 18 x 7.5" GT1 from the GB270. Of course a narrower rim would have more trouble clearing the caliper.

johnnybon

iTrader: (70)

disc are on the wrong way

need4speeduk

iTrader: (26)

You may find you'll need a offset of 48 and below to clear these.

johnnybon

iTrader: (70)

Yes that what my wheel are and they realy only just clear I have some et20 to go on later

MattyB1983

iTrader: (51)

My discs are on that way

johnnybon

iTrader: (70)

I was told that the arches on the disc should face forward ??

MattyB1983

iTrader: (51)

Nope.

MadUsa1

An ET 48 on a 7.5" rim?

That would be like an ET 60 on an 8.5" rim.

MadUsa1

How wide are your rims?

2pot

iTrader: (3)

Other direction - et35mm
Make sure you've got 3mm minimum clearance spoke to caliper - unlike the previous nasioc link

MadUsa1

No sorry, if you have a wider rim you need a higher offset to get the same brake clearance. So, if an ET48 is needed on a 7.5 inch rim, you will need an ET of around 60 on an 8.5 inch rim.

2pot

iTrader: (3)

Are you sure?
I think you've just moved the wheel rim 1" inwards

need4speeduk

iTrader: (26)

I'm using 8.5" and 9" wheels with ET11 offset and have no issues with clearance. I personally would go 45 or lower to be on the safe side.

MadUsa1

Hmmm, maybe you're right...

banny sti

iTrader: (68)

The higher the ET the further in the arch the wheel is, the lower the ET the further out the wheel

MadUsa1

Nah, hang on, I'm right. ET is measured to the inside of the rim, not the outside. Hence, a 7.5" ET48 is like an 8.5" ET60.

That's why the website quoted in that naisoc thread states that the 7.5" ET53 rim will not fit over brembos, but the 8.5" ET53 will clear brembos.

2pot

iTrader: (3)

In the light of previous posts: Are you sure?

banny sti

iTrader: (68)

7.5*17 ET50 235 tyres



8*17 ET35 225 tyres

MadUsa1

Yeah, I'm sure (I think) :-)

keljon

iTrader: (10)

does anyone make the brackets for porsche callipers?

MadUsa1

Yeah, Ian Godspeed at Godspeed brakes