I'm not sure why your telling me that super sticky rubber will be useless at the drags. They are 50 profile so a bit low profile.
I've run circuit orientated semis before on another car and had so much grip I broke suspension mounts. Semis on the street have more grip than street tyres at the track!
Joined: 01 Feb 2013 Posts: 291 Location: NSW Central Coast
Posted: Tue Apr 09, 2013 2:01 pm Post subject:
its the lack of sidewall man...
your "super sticky semis" are grippy on the corners... not on straights and on launch...
i ran semi's at the drags once, was all i had at the time - they were fukn useless - they were some very very very expensive pirelli's etc etc etc zero traction on launch, zero traction at half track and even fried them across the finish line on one run... _________________
STUFF STILL FOR SALE!!!
WORK Eurolines 18x9 & 18x10 with 255&275 tyres!
Factory rear bar and side skirts
Stock front seats
Joined: 22 Apr 2007 Posts: 4010 Location: Perth, WA
Posted: Tue Apr 09, 2013 2:11 pm Post subject:
Not necessarily?
Each tyre brand has their own 'level' of sidewall flexing... eg. Bridgestone are known for hard sidewalls on their street tyres, whereas Kumho fpr instance are more midrange. Tyre fitters know all about it as they have to bend sidewalls all day long fitting them on things... brands are just different like that.
I'm not saying drag tyres aren't going to have softer sidewalls. They will for sure! But just because a tyre is a slightly more aggressive compound and the manufacturer decides to call it a semi does not mean its sidewall is less flexible. I can guarantee you there are semi's with much much softer sidewalls than my current Bridgestone street tyres. _________________
1994 Black JZS147 Aristo - RIP. Went swimming
New 1992 Aristo Project
Joined: 01 Feb 2013 Posts: 291 Location: NSW Central Coast
Posted: Tue Apr 09, 2013 2:12 pm Post subject:
karlcho88 wrote:
I'm not sure why your telling me that super sticky rubber will be useless at the drags. They are 50 profile so a bit low profile.
I've run circuit orientated semis before on another car and had so much grip I broke suspension mounts. Semis on the street have more grip than street tyres at the track!
its not just my oninion - its common sense.... have a read!!
Joined: 01 Feb 2013 Posts: 291 Location: NSW Central Coast
Posted: Tue Apr 09, 2013 2:17 pm Post subject:
if you must - try some old falcon rims - same stud patter and they will be 15's... i have a pair of XW GT falcon snow flake rims i use for 15's - only used them on my 2jz mk3 supra though but id say they'd fit the rears of the aristo - good luck finding a pair though :p _________________
STUFF STILL FOR SALE!!!
WORK Eurolines 18x9 & 18x10 with 255&275 tyres!
Factory rear bar and side skirts
Stock front seats
Joined: 22 Apr 2007 Posts: 4010 Location: Perth, WA
Posted: Tue Apr 09, 2013 2:21 pm Post subject:
Since you linked that, i'll quote from it: "MT's and Yokahama semi's would be my personal choice for some street legal straight line grip"
ie. There are "semi's" with soft sidewalls, which are perfect for dragging on. Get some fat rubber, lower the psi a tad. You're set.
There's no definitive link between "being a semislick" and "hard sidewalls", so really it just depends on the tyre. Either way, im sure 80% of the reason he wants to run them is due to the lower rolling diameter, being they're undersized.
To answer your question: I would imagine you could get 15"s to fit on the rear only, with stock calipers. But it would probably depend on the rim design. There's not a whole lot of room there.. _________________
1994 Black JZS147 Aristo - RIP. Went swimming
New 1992 Aristo Project
Joined: 01 Feb 2013 Posts: 291 Location: NSW Central Coast
Posted: Tue Apr 09, 2013 2:24 pm Post subject:
semi slicks for circuit racing arent designed to run with low psi in them... regardless of softness of sidewall...!! you would not race around a circuit on 14-20psi lol and even at those pressures at the drags there isnt sufficient sidewall to make it worth while! its just a huge circle!! they are for drag racing - save them for a track day!! _________________
STUFF STILL FOR SALE!!!
WORK Eurolines 18x9 & 18x10 with 255&275 tyres!
Factory rear bar and side skirts
Stock front seats
Joined: 22 Apr 2007 Posts: 4010 Location: Perth, WA
Posted: Tue Apr 09, 2013 2:32 pm Post subject:
I'm beginning to think you didn't even read the post, or that thread on SF.
Who says they're circuit racing specific semislicks?
You're jumping to all sorts of wild conclusions about this guy's setup.
You're entirely correct about circuit designed tyres being sh*t on the drag strip, for exactly the reasons you mentioned. You fail to notice, however, that there is nothing that says that these tyres are what you claim they are.
Chill out a bit.
He has semi's.
We don't know anything about them, but that they're 15", 50 profile and low rolling diameter (ie from a different car).
There's absolutely no reason, with the information given, to rant about why these particular tyres would be worse than his street tyres on the dragstrip.
And i'm going to leave completely alone the reference to running 14psi (??) on the circuit, cos I've no idea how you ended up there... _________________
1994 Black JZS147 Aristo - RIP. Went swimming
New 1992 Aristo Project
In all honesty tho, tires that are designed to work on a race track arent goin to work as well as tires that are designed to work on the strip, just like street tires arent designed to work incredibly well on either surface bar the road, even then some tires cant even do that!!
i got a pair of Hoosier A6/R6 one or the other, they are a semi and they work better than my ze912s on the street...that was just a quick 'warm up' of the tire, havent actually driven on them, but plan on goin to drags with them...
i expect them to provide more traction than my 912s, but not alot more!
i think a 15" would struggle to fit on! the rear disc are just over 300mm as it is, i know my 16s dont leave much room! _________________
Joined: 17 May 2009 Posts: 3928 Location: S.E Melbourne
Posted: Tue Apr 09, 2013 5:28 pm Post subject:
Seriously WTF??
EF-EL falcon 15's fit but they are only 6-6.5in depending whether you find taxi spec rims.
I'd invest in a pair of second hand mt 235/60r15. A lot of people think they're worn once the tread gets to the indicators but that's when they come good for the drag strip.
They are Bridgestone RE55S.... Though I just checked and they are only 195/50's.... i thought they were wider.
I currently have no traction problems at the local dragstrip in Mildura that is a 1/8th mile track and generally pretty well prepped.
I'm running supra 16x9's at rear with ching chong 245/50R16.
The car is just is a little slow off the mark due to the gearing and being a 1/8th mile it is more critical that a 1/4. I was looking for a cheap way to reduce the rolling diameter, not overly worried about traction.
I have no intent to invest on drag specific tyres... I just already had the RE55s in the shed... I might just bolt them on the front of my recent TT converted galant (4 stud) and take that instead
There just dont seem to be much available in lower profile 16"s
Joined: 22 Apr 2007 Posts: 4010 Location: Perth, WA
Posted: Tue Apr 09, 2013 7:19 pm Post subject:
Bridgestone are relatively reknowned for hard sidewalls... I think you'll find your times are not going to be much better (if at all) even if you sourced rims for those tyres and got it all going. The amount of grip you'll have with 195s will likely be onpar with cheapo 245s anyway and the whole exercise relatively fruitless. _________________
1994 Black JZS147 Aristo - RIP. Went swimming
New 1992 Aristo Project
Rolling diameter 245/50R16 = 651.4mm
Rolling diameter 195/50R15 = 576mm
11% reduction in rolling diameter means shorter gearing and getting off the line with stock stall and diff is improved! For the cost of falcon scrap + tyre fitting
As mentioned several times. I am not concerned with traction. It it not a problem. Traction = OK.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
