I would appreciate any input on the following problems.
My car(MY00 Classic shape Jap spec Impreza STi) will be used for track/hillclimb competitions I am considering fitting a set of AP Racing 4-pot I have the following problems, the car was bought with 17" OZ Superlggera`s plus I have a spare set of OZ P1 wheels. So the logical thing would be to get a set of 17" slicks, the problem is that the only slicks available in South Africa in the 17" size are 225/45/17`s, will this tyre size fit a classic shape Impreza?? My alternative is to get a set of OE 16" wheels and use the set of 205/50/16 slicks that I already have, but ehre is where the brake problems come into play. The 330mm AP Racing brakes will not fit with the 16" wheels, am I correct?? I have seen that there are 305mm AP Racing kits that are sold to fit the 16" OE wheels, are these any good?? Please I need some advice ASAP before I make any stupid decisions :) Regards Gerardo |
Ok, ignore the tyre question, I will not be fitting 225/45`s as they require too many mods.
Can anyone advice with the brake question?? |
17in slicks are notoriously hard to find, but there are some trackday tyres available - basically cut slicks to make them road legal. Dunlop, Khumo, Michelin I think (Yoko?) though availablity is a different thing. You quote 225/45x17 which suggests you are not looking at a true slick anyway. Slicks are specc'd with their rolling diameter in mm, not the aspect ratio as a % of width. You need something like 210/605x17.
225 will probably be too wide at the back, even with the optimum off-set wheels which is 52mm so your P1 wheels will give you best clearance. Your other OZ wheels are 48mm off-set I think which will almost certainly rub. You might get lucky with some tyres, in which case stick them on the P1 rims. But a spare set of 16in Subaru rims (off-set 53mm - don't go below 50mm to be sure of not rubbing) is the easiest route. Don't worry about fitting the AP 4-pot brake kit under them as they will still stop a train. I used to have them and did a lot of track days. Awesome. I've now got 6-pots under 17s but only because I got a mega-deal - the guy I sold the 16in kit to was doing 100-0 in 3.8 secs, as I recall, as many times as he still had the strength to hold on. That is very violent stopping indeed :eek: Cheers, Richard. PS Edited to add crossed post. You've done the right thing with the 225 tyres :D [Edited by Hoppy - 1/10/2004 6:03:53 PM] |
Thanks for the input mate!! :)
So the 305mm AP`s are just as good then?? |
No, in theory they are not. But at Donington, the hardest circuit on brakes in the UK, my 305mm discs had enough leverage to trip the ABS at 120mph on a dry track. And they would do it lap after lap which is the real test. I have wrecked two sets of discs there, one set of standard and another pair of Group N replacements. Warped and cracked so that you could see daylight through them. Utterly useless. The APs just took it all and kept on going.
Obviously, the bigger 17in kit and-pot calipers are better. More metal for head-soak, bigger pads and I get a lighter pedal which makes me thnk I can do trail braking which, frankly, ends in a spin as often as not :D What I'm saying is that the 16in kit is better than I am, and that my fabulous 6-pots are just overkill unless you are very talented and race at a high and serious level. Best, Richard. |
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