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Hankook Z221S Vs Ao50's/re55S/dz03S

HKS26T

By HKS26T,
in Motorsport Discussion & Builds

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HKS26T Experienced

HKS26T

Posted
Posted

Hi guys,

just trying to get as much info as possible on the Hancook z221s. I have noticed that times are getting slashed by those who are using these and they are now the tire of choice in japanese time attack (hence why i got a set to compensate for my driving abilities :P )

Is it a better compound? or the fact that they are just wider? i have two examples where an Evo that previously went 41's aound EC on 265's Ao50's

ran a pb at the latest round of sprints dipping into the 39's on 295 Z221s and the other being a FD in SA going 3 secs quicker throughout the day when switching from Dunlops Dz03's in the first session

EVO - P2

http://www.natsoft.com.au/cgi-bin/results.cgi?26/02/2011.EAST.S1

FD - P2

http://www.orion-timing.com/1028/20110306/1028_20110306_001_03_01.htm

i guess some useful pointers would be what pressures some people run on there particular tires.

My experiences with advans that yielded the best times are

A050's - 34psi cold 36 hot

Ad08s - 32psi cold 34 hot

i was suppose to try out my set last saturday at the sau/renew track day but time got the better of me with getting the car ready.

I will definately post up some results as soon as i get out there

:cheers:

Steve

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GTR32G Proficient

GTR32G

Posted
Posted

As to the times from Kalis in the EVO, he also has gone wide body with wider wheels and track from last year so could be a combination or upgrades? But I’m watching people on Hankook’s very closely as well to what tyre will be best for time attack. The 26th Feb at the creek was a very worm day with very high track temps so maybe it did suit the Hankook’s more will be interesting to see feedback from cooler day eg winter at Wakefield.

Anyone know track temps that the japs would see at their time attack events?

Will look forward to reports once you have tested them also Steve keep us posted with results.

Marlin Grand Master

Marlin

Posted
Posted

Just keep in mind you can't really rely on the "top" time attack teams to get a real and accurate picture of the pace of a tyre.

They use the tyre in a different way to mere mortals like myself, I want a tyre to be both fairly quick, but also usefull for several track days. We all know how expensive they are!

The top teams use the tyre completely differently, typically there is a "sweet" zone, a zone where that particular tyre will go outrageously quick to set "the" time, but after that one lap, it's past its prime and will never be as quick again.

At EC last year..... it was worth 2 seconds using the tyre correctly. TWO seconds! But after that, the tyre was effectively a rag.

Marlin Grand Master

Marlin

Posted
Posted

On a typical mid 20's day, around 6 psi mate.

Obviously it's track or road dependant, ie, how hard the tyre and brakes are working.

On a typical day at Lakeside, I'll kick off at 28psi cold, but first session they'll be up to 36 or so, so I bleed back to 32 and there they stay usually. Obviously I check them during the day to ensure there's no issues.

FineLine Grand Master

FineLine

Posted
Posted

Anyone know what the 295/18's are worth a pop?

Nice to see another tyre though. Seems in GTR sizes they come in both S and MH compound. Would be good to test regardless.

I.ve been quoted just over 500 a corner for that size from a local guy who deals only in slicks and semi's Snowy.

Over 200 a pop cheaper than the direzza's. Gotta be worth a try at that price.

  • 3 months later...
hrd-hr30 Grand Master

hrd-hr30

Posted
Posted

I normally get between 6-8 psi more pressure from cold to hot too, depending on what corner the tyre is on. LF cops the most work (and therefore pressure increase) at Lakeside.

I set my pressures a bit differently to some though. I find my car is always faster in the first few laps of a session - probably due to heat soak as the session goes on. My top speeds continually seem to drop off each lap, even if the corner speed onto the straight doesn't. So I am happy to let my tyres go ~2-3 psi higher by the end of a 5 lap session than I ideally want them, to try and have them at their optimum pressure at the same time the car is at its best - lap 2 or 3. That's my theory anyway.

  • 3 weeks later...
T04GTR Grand Master

T04GTR

Posted
Posted

i know with the older 048's we ran in the utes, 1810kg,, 235's we set out at eastern creek at 28 and bleed them off at 40. they seem happiest at 40-45psi hot. heavy car and probably not relavent. but worth knowing i spose.

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