If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed, registering will remove the in post advertisements. To start viewing messages,
select the forum that you want to visit from the selection below.
This means you should apply for your renewal now to avoid any disruptions to your membership whilst the renewal process is taking place! NOTE: If you have an auto renewing subscription this will happen automatically.
Above Forum Ad
Collapse
Announcement
Collapse
Email Notifications Failing (mostly Telstra)
Hello everyone. Seems there is an issue with Telstra (possible others) blocking email from our server. If you are trying to sign up I would suggest a different email if possible. If you're trying to reset your password and it fails please use the Contact Us page:
16's will give best/better acceleration, 18's will give better top end speed.
depends on what track you're on. Remember Rolling dia. of the wheels, if similar (between 16's and 18's) the end result will be similar, so if you go 16's, go for a low profile (lower than standard)
I'm pretty sure that's how it works, anyone else confirm?
Its all too do with the tyre and pressure. Ppl have there own personal preferences for pressure etc.
If ur not using the standard wheels, get some track tyres put on them otherwise some nice wide ones. But low profiles on 18's are no good.
if you look on the oz racing wheels. and look at there light weight racing rims u can buy, which are like 60% lighter, im prity sure they only do upto 18's for all cars. Say for a commodore, ud get a set of them that are light weight and put track tyres on them....
But in saying all this, if u have the standard tyres then traction may be a problem because there like 205 and not really designed for the track..........
Put the stockies back on for a track day. Accelleration is king.
sigpic Camden GTI Performance. VW / AUDI Specialists
All Mechanical Work, Log book Servicing, New and used Parts and Imports
19-20/6 Badgally Road, Campbelltown, 2560 02 4627 3072 or 0423 051737www.camdengti.com
I'd go 17's too (and plan to when I find a set I like for a price I like) unless you put on some big arse brakes that wont fit under 17's (I've only changed pads ebc redstuff and slotted rotors and although I could have more braking power, it'll do for the meantime)
If you've never done a track day before 16s would be fine. The extra sidewall will be a bit more forgiving and if you find the limit they won't break away as suddenly. Lets face it you're there to have fun and an extra couple of tenths won't matter.
Extra sidewall is fine aslong as the wall doesn't tuck under. The standard continentals would be ok IMO.
16"s are the better option if you are after semi slicks or full slicks to get some great times. A set of semi slicks are affordable these days and have thicker side walls with less flex than all high performance street tyres. If you run around 30 psi in them to get a good size foot print on the tarmac your track times will drop and the level of grip is fantastic!
sigpic
Mk2 GTI 2 door 1.9l 8v turbo 1st mk2 1st engineered water vw nats 09
Mk1 twin eng twin turb
scirocco gti 2.1l 16v turb 6spd
Audi A4 B5 1.8t
i have done a few track days on my 18's with semislicks on.
i have just have just sold the 18's and now consiering semi slicks for the 16"s for track events.
MK4 GTI|REVO|4BAR ADJ FPR|APR FMIC|APR R1 DV|TURBO INLET PIPE|KONI|WHITELINE|CUSTOM CAI + K&N|2.5" TB + HI FLOW CAT| ECS DOGBONE
You have to also consider the unsprung weight for your vehicle, if the 18"s weigh heaps more than your 16"s then they will be heaps slower. The gearing of your car is also affected by the diameter which is a combination of the overall wheel/tyre combination.
Interestingly in this article they say that the 15"s are ultimately faster but they were able to get more consistent times from the 16"s.
Now this is for a Mk3 vehicle which is different to a Mk4 but the same principles should apply.
From a pure physics point of view, I expected that result, that the 15's were the "fastest". The maths could have told you that.
What I found very interesting was: the sidewalls.
For the click lazy, they had 40 (profiles I'm talking here) on the 17's, 45's on the 16's and 50's on the 15's. Funnily enough, they complained about the lack of fine control and 'twitchyness' - "hop and roll" to quote them directly.
Clearly it's because they are running a 50 profile rubber. I would have liked to have seen the different a profile used. also note that the rims were different width's, but the 205 size was used on all the tyres, and as you can see, a d205-50-15 tends to bulge quite a bit on a 6.5" rim!
I would have like to have seen the dfference between 205-50-15 and say 195-40-15 (for example), basically something with alot less sidewall. This would reduced sidewall flex giving it better control and also slightly reduce the rolling diameter, for again better accel.
I think it was an unfair comparison, to compare te "handling" caracteristics of the wheel tyre/combo when the wheels weren't in proportion to each other - ie, just from the photos you can see that the 15's are bulging, and 16's are perfectly fitted and the 17's have a gentle stretch about them - all the sidewalls were different meaning they would have different handling characteristics, even if they were the same size rims!
Anyways. It's late and I'm starting to rant.
Hope you got the general gist of what I've been trying to say.
Frankly, 16's with 205-40/45 semi's or high performance tyres, will be the best combo IMO.
Comment