9N3 with Porker D90's?

[MeTsU]

Hey guys,

There's something about my stock BBS split that grabs me, had plans, until I calculated the spacers I'd need to run to get the right stance would be ridiculous. So I've though about maybe a set of D90's, narrow & wide, they are 6J ET 52,3 & 8J ET 52,3. According to the calculations of a mate, thanks Nic (Neuk) for sorting out my errors , I'd need a a 15mm adapter in front and a -10mm adapter at the back. Now obviously, -10mm adapter is a problem, as the smallest is 15mm, so this is a major issue.

Would you guys say that D90's of this spec is possible to run and worthwhile etc? I love the Porker Cup 3's, Nic's (Neuk) got a set of replicas. Give you an idea of the type of wheels I'm keen on. Unfortunately, we don't have a great euro variety here in South Africa.

Any advice and assistance would be greatly appreciated. Thanks guys!

[MeTsU]

Oh, sorry guys, forgot to mention that I'm looking for a practical setup, as I do drive relatively spiritedly and I will move onto coils once I have cash again. I'm not looking to poke, but to probably tuck neatly, if I can explain correctly.

Thanks, Matteo.

[MeTsU]

Hey guys,

So been doing some calculations and this is a quote from a conversation with a mate - thanks Neuk. What do you guys make of this? I'm trying to calculate what size adapters I'd need to fit a set of D90's.

OK so if we look at this logically:

Front:

6,5j changing to 6j so you are losing a quarter of an inch on the outer rim - 1/4" = 6.35mm
ET43 changing to ET52.3 so the wheel will be sticking into the wheel arch by 9.3mm
So to get the outer rim to sit in the same position as your current wheel you will need to add a 9.3 mm spacer for the ET change, and a further 6.35mm spacer for the wheel width change, giving you a total of 15.65 mm in spacer you will need...

Rear:

6,5j changing to 8j so you are gaining three quarters of an inch on the outer rim - 3/4" = 19.05mm
ET43 changing to ET52.3 so the wheel will be sticking into the wheel arch by 9.3mm
So to get the outer rim to sit in the same position as your current wheel you will need to add a 9.3 mm spacer for the ET change, and reduce the ET by 19.05mm for the wheel width change, giving you a total of - 9.75mm in spacer you will need...

So you would need spacers for the front, and would actually need to machine the wheel for the rear to reduce the ET! This causes massive issues because you will need PCD adapters as well to get the wheels to fit...

Now obviously, this is calculated according to my current stock wheels, which I'd liked to have spaced anyway, so those measurements for front and rear adapters isn't final, as they'd need to thicken up a little more.

Do these calcs make sense?

[Tim_GTi]

The rears on the second calculation are wrong. They say you'll increase the wheel width by 3/4 inch, when you don't you'll increase it by 1.5 inches with an 8j wheel.

You get a fair amount of tuck with standard wheels, so a lower ET that pushes the wheels out of the arch isn't always going to cause a problem. i certainly wouldn't look at decreasing the rears to get them to be exactly the same as the standard ET. Just ride a slightly wider stance.

ET doesn't ahve to always be the same, so you'd be fine running the D90s, just make sure they don't stick too far into the arch and rub. Have a look at other peoples stances and see what issues they encounter as to if the D90s will scrub.

I also tend to disagree with staggered stances on front wheel drive cars. Sure it looks great having them wider at the rear. But it'll increase under steer!

[MeTsU]

Thanks for the reply Tim. Greatly appreciate it.

The reason we worked out the adapter sizes according to the standard wheels specs, was just as a base calculation. Of course I want the arches to be filled, not keen on poking madly or going stretch. But you did make me think of something I hadn't really thought of, which was the under-steer caused by a wider track at the back.

[Neuk]

The rears on the second calculation are wrong. They say you'll increase the wheel width by 3/4 inch, when you don't you'll increase it by 1.5 inches with an 8j wheel.

Tim - Remember that although teh wheeld width increases by 1.5", the outer (or inner) lip moves half of that, so 0.75", relative to teh centreline of the wheel, from where ET is measured...

You get a fair amount of tuck with standard wheels, so a lower ET that pushes the wheels out of the arch isn't always going to cause a problem. i certainly wouldn't look at decreasing the rears to get them to be exactly the same as the standard ET. Just ride a slightly wider stance.

ET doesn't ahve to always be the same, so you'd be fine running the D90s, just make sure they don't stick too far into the arch and rub. Have a look at other peoples stances and see what issues they encounter as to if the D90s will scrub.

Matt - This is where I am going wrong Tim is right, we don't need to match the current wheels ET, we can let the D90's sit a bit wider than the current wheel...

Check my mail I sent last night...

Cheers
Nic

[MeTsU]

Thanks Nic, your mail came through this morning at 08:45. That's what I realised last night, we had used the stock setup as a reference, instead of say your Cup 3 reps or Phat 5's, as those wheels sit pretty well without spacers.