Jump to content
SAU Community

Tyres

giant

By giant,
in Motorsport Discussion & Builds

 Share

Recommended Posts

hrd-hr30 Grand Master

hrd-hr30

Posted
Posted

I called Craig at Hornibrook Motorsports. Doesn't look like anyone makes softs in such large sizes. I guess they figure they're for big heavy cars that need a harder tyre. If Toyo RA1's are available in that size it might be the go.

or maybe you could run slicks? the AWD turbo class doesn't really have any rules... it only exists at Mt Cotton. Otherwise, Stuart Inwood ran his GTR in Sports Cars at the Australian Hillclimb hampionship . Slicks are allowed in that class, but he was on semis.

Link to comment
https://www.sau.com.au/forums/topic/206142-tyres/#findComment-3647776
Share on other sites
Beer Baron Grand Master

Beer Baron

Posted
Posted

true, plenty of GT3 Cup Cars with lots of dunlop and michelein slicks around that will suit your size. cheap cheap! forget carrera cup though. look to prod sports. the guys we used to run with there have lots of dough and go through a set per session and will practically give them away (well compared to what they cost new).

I can't remember what sizes we used to run, but they were staggered front and rear (around 255 front and 285 rear). you could probably run a set of rears all 'round on your thing. most guys I know who buy them second hand buy fronts only as they are generally going on 9 or 9.5 inch wide wheels and the porshce rears are too wide. more left for you!

Link to comment
https://www.sau.com.au/forums/topic/206142-tyres/#findComment-3647814
Share on other sites
hrd-hr30 Grand Master

hrd-hr30

Posted
Posted
harry can't we use slick's at mnt cotton hill climb?

yes you can. the question is if they're allowed in the AWD turbo class or not. That's a class MG Car Club created themselves to get the fast modern cars out of Improved Prod and Road Registered classes to give the old bangers a chance of winning something! It doesn't exist in the CAMS manual so it really have any rules. You *should* be able to run slicks.

If they won't let you run slicks in that class, you could always run in Sports Car or Sports Sedan class. Stuart Inwood ran his GTR in Sport Cars Closed in the AHC last year, so they're definitely eligible for that category. And they are now also eligible for Sport Sedan category, both of which permit the use of full slicks.

on the RE55S, I've only used the SR compound, which i think is the hardest of their compounds. So I can't really comment on whether the Toyo is softer than the medium Bridgey. As for the Dunlops, I haven't tried them myself. Maybe a helpful tyre store would allow you to poke a durometer at a couple of new tyres? You can make one easily enough - it won't give you an actual duro reading, but will tell you which of two tyres is the softer compound.

Link to comment
https://www.sau.com.au/forums/topic/206142-tyres/#findComment-3648358
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Kapr
      "Cheap" bolt on turbo on RB25DET NEO

      By Kapr · Posted

      You are selling this? I have never bought something from marketplace...i dont know if i trust that enough. And the price is little bit "too" good...
    • Watermouse
      "Cheap" bolt on turbo on RB25DET NEO

      By Watermouse · Posted

      https://www.facebook.com/share/19kSVAc4tc/?mibextid=wwXIfr
    • Kinkstaah
      Airbox for +T

      By Kinkstaah · Posted

      It would be well worth deciding where you want to go and what you care about. Reliability of everything in a 34 drops MASSIVELY above the 300kw mark. Keeping everything going great at beyond that value will cost ten times the $. Clutches become shit, gearboxes (and engines/bottom ends) become consumable, traction becomes crap. The good news is looking legalish/actually being legal is slighly under the 300kw mark. I would make the assumption you want to ditch the stock plenum too and want to go a front facing unit of some description due to the cross flow. Do the bends on a return flow hurt? Not really. A couple of bends do make a difference but not nearly as much in a forced induction situation. Add 1psi of boost to overcome it. Nobody has ever gone and done a track session monitoring IAT then done a different session on a different intercooler and monitored IAT to see the difference here. All of the benefits here are likely in the "My engine is a forged consumable that I drive once a year because it needs a rebuild every year which takes 9 months of the year to complete" territory. It would be well worth deciding where you want to go and what you care about with this car.
    • GTSBoy
      Airbox for +T

      By GTSBoy · Posted

      By "reverse flow", do you mean "return flow"? Being the IC having a return pipe back behind the bumper reo, or similar? If so... I am currently making ~250 rwkW on a Neo at ~17-18 psi. With a return flow. There's nothing to indicate that it is costing me a lot of power at this level, and I would be surprised if I could not push it harder. True, I have not measured pressure drop across it or IAT changes, but the car does not seem upset about it in any way. I won't be bothering to look into it unless it starts giving trouble or doesn't respond to boost increases when I next put it on the dyno. FWIW, it was tuned with the boost controller off, so achieving ~15-16 psi on the wastegate spring alone, and it is noticeably quicker with the boost controller on and yielding a couple of extra pounds. Hence why I think it is doing OK. So, no, I would not arbitrarily say that return flows are restrictive. Yes, they are certainly restrictive if you're aiming for higher power levels. But I also think that the happy place for a street car is <300 rwkW anyway, so I'm not going to be aiming for power levels that would require me to change the inlet pipework. My car looks very stock, even though everything is different. The turbo and inlet pipes all look stock and run in the stock locations, The airbox looks stock (apart from the inlet being opened up). The turbo looks stock, because it's in the stock location, is the stock housings and can't really be seen anyway. It makes enough power to be good to drive, but won't raise eyebrows if I ever f**k up enough for the cops to lift the bonnet.
    • BuiltNotBought
      Airbox for +T

      By BuiltNotBought · Posted

      There is a guy who said he can weld me piping without having to cut chassis, maybe I do that ? Or do I just go reverse flow but isn’t reverse flow very limited once again? 
×
×
  • Create New...