Jump to content
SAU Community

Running 27/68-18 Slicks?

savant

By savant,
in Motorsport Discussion & Builds

 Share

Recommended Posts

savant Apprentice

savant

Posted
Posted

Hi Guys,

We are looking at running Michelin 27/68-18 (682mm high) slicks on all four corners. We can get these cheap second hand ex-Porsche cup (about $250/set).

Will these be too tall? I gather the V-Spec's ran 225/50-17's which are about a 657mm rolling diameter, so we would only be about 25mm oversize.

I assume the width is not such an issue, we are looking at getting a set of Enkei RPF1's in 18x10.5 ET18.

We are currently running 24/625-17's which are obviously not a problem. We could also get 24/65-18's (also ex Porsche cup) and get some 9.5" wheels but would rather run the wider setup.

Cheers for your help!

Link to comment
https://www.sau.com.au/forums/topic/361948-running-2768-18-slicks/
Share on other sites
blackrex Mentor

blackrex

Posted
Posted

Make sure that they are not a specific construction to cope with the "unique" layout of the Porsche Cup Cars, I am aware that the euro series do have their own spec Michelins, I'm not sure if it is the same here.

savant Apprentice

savant

Posted
  • Author
Posted
Make sure that they are not a specific construction to cope with the "unique" layout of the Porsche Cup Cars, I am aware that the euro series do have their own spec Michelins, I'm not sure if it is the same here.

Good point, it was suggested we don't run the fronts (the 24/65-18's) as this is the light end on the Porsches.

R32 Stuart Community Regular

R32 Stuart

Posted
Posted

Hi Guys,

We are looking at running Michelin 27/68-18 (682mm high) slicks on all four corners. We can get these cheap second hand ex-Porsche cup (about $250/set).

Will these be too tall? I gather the V-Spec's ran 225/50-17's which are about a 657mm rolling diameter, so we would only be about 25mm oversize.

I assume the width is not such an issue, we are looking at getting a set of Enkei RPF1's in 18x10.5 ET18.

We are currently running 24/625-17's which are obviously not a problem. We could also get 24/65-18's (also ex Porsche cup) and get some 9.5" wheels but would rather run the wider setup.

Cheers for your help!

R35 Duncan ran the Michelin's, new and used - had some concerns on heat cycles etc with some.

I ran Dunlop 280x 680 x 18s on R33 you will have issues with inner guard plastics front and rear, fuel filler plastics foul, if you are lucky enough to get some grippy ones even not running spacers stock up on wheel bearings.

The 25mm oversize will give you about 1/2 a gear difference - so depending on horse power, torque and the track you are running - something to keep in mind

Cheers

T04GTR Grand Master

T04GTR

Posted
Posted

get the 27-65-18. front tyre for gt3-rsr. also used on a few production sport cars too.

ive got a couple stacking up in my garage. (used to work for the utes and lots left after each meeting...)

they do fit under my missus r33 gtst. so 32 gtr wouldnt be an issue. but a wheel with +22 or greater will help fitment. (guard clearance) z32 wheels with a custom bolton spacer thickness would be the easiest option

  • 2 weeks later...
jazzy_j Community Regular

jazzy_j

Posted
Posted

They will fit. However you will have to remove the inner wheel arch guards and the factory blow off valves if you still have them. The car will ride hi but it's not too much of an issue if you set the car up right.

Last time I saw the Windfield GTR at eastern creek it was running these exact tyres.

OLLIE_NZ Enthusiast

OLLIE_NZ

Posted
Posted

They will fit. However you will have to remove the inner wheel arch guards and the factory blow off valves if you still have them. The car will ride hi but it's not too much of an issue if you set the car up right.

Last time I saw the Windfield GTR at eastern creek it was running these exact tyres.

Thanks Jay, (I co-own the car with savant/ Willie)

If that's all it will take then it's worth it for the price saving on buying slicks alone.

So you reckon, just removing the plastic wheel arch liners is enough, no guard rolling needed?

Does anyone know what dimension the tyres were on the Bathrust GTRs?

Cheers mate,

Ollie.

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

    • The Bogan
      Torana Lx Gtr Hatch, Lots Of Pictures

      By The Bogan · Posted

      LOL, when one "money pit" is never enough Noice, and excellent work mate
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I have more than enough digging, laying blocks, moving gravel, airrating, feeding and top soiling the grass, and setting up the veggie gardens growing some seedlings,  and then removing all the unused rock to keep me busy for the next few months at least,  hopefully the rain stops soon so I can get a few hours in this arvo, but, before that Sunday is washing day, is every body happy, you bet your life we are Nice country road day drives are a day off whenever I'm muscle sore from all the landscaping at the moment, but, more epic multiple day drives will start once the majority of the big jobs outside are completed
    • MBS206
      NC MX5

      By MBS206 · Posted

      I hear that would involve some nice country road drives into the hills for Mark...
    • MBS206
      Recommendation for engine oil funnel spill free

      By MBS206 · Posted

      I thought I'd come back and add something I JUST learned. A Toyota LandCruiser with a 1HZ, mates perfectly with a bottle of Nulon brake fluid. As in, it perfectly screws in. Great make shift funnel when you cut the bottom of it off. This may work for your Corolla.   Unfortunately, tipping a 10L drum is much harder than a 4 to 6L bottle, and they no longer include the easy pour tap which was just perfection to use previously.  
    • EndZee
      Fuel Pump Control Module & Dropping Resistor

      By EndZee · Posted

      Guys since i bought r33 gts25t coupe 1994 automatic a/t(manual swap 350z gearbox)  all i got is problems, always problems. Lets start with that when i turn key into ignition(ON) fuel pump doesnt always works. Sometimes i have to turn key twice Off/on/off/on until it primes. Its new, dw300 - 340lph. My gearbox broke so i did gearbox swap, install different intake manifold, injectors and i take pipes. Car was sitting in garage for more than half a year. I did assembly all not that long ago and when i turn ignition cant hear prime. All of sudden it stopped working. Theres many videos on YouTube how to make relay mod on r33 straight from battery so i did and it doesnt work! 😰 30 - battery positive  87 - positive from fuel pump to relay 85, 86 - one of two wires from original fuel pump wires(light blue, grey) and it didn’t work. so I check on ignition and took original BLUE relays wires from trunk, next to fuses. (I believe it’s IGN+ and ECU pin 18. it didn’t work…  tried connecting (IGN+ from og relay) and (ECU 104 from 1of4 FPCM wires) to my new relay 85/86 and it didn’t work.  I unplug FPCM. Didn’t work. im thinking what’s wrong   fuel pump is working, if I leave IGN+ on 85 and 86 straight to ground it works but it’s just nonstop. Since it getting constant 12v after key in ON. light blue wire gives me 6-8v.  so how this should be connected? What causing ECU not giving — on pin? Or I did sth wrong and that’s why it doesn’t work? I need negative signal on ECU that control fuel pump. What this should be?
×
×
  • Create New...