As everybody knows, Calaisturbo.com is going to calder!
Ive got a set of stocky 14s, 15" interceptors, and 16" walkies.
All with some fair tred.
Question is, which one will give me the most optimum grip?
The Tyres are 195, 205, 225 wide respectively.
The car is manual, so traction could be a problem.
I was thinking that the interceptors would be a good compromise between the two, as they are cheap to replace and so forth.
the 14s would be good for smoke, but i cbf doing burnouts, u just wanna take it down the strip.
If gates open early and racing starts at 10 am, how any runs would people generally get if you stay for the whole day? Also i might have a carload of friends to come for support, can they be in the pits as well like in heathcote? If not, how many crew members can i have, and can they interchange?
Thanks.
OK... I found my best traction and times were on 15's
I did my fastest trap speed on 205x60x15's (13.87 @ 106mph)
I done my fastest time on 205x65x15's (13.5 @ 99mph)
and 17's were good for nothing, I got a 13.9 I think out of them, but they gave sweet frick all traction.
Use your 15's and let them down to 15psi, just be careful coz at speed on low pressure tyres it starts to skip around a little towards the end. Ask morepsi if ya can he had a pretty sweet setup to run with on his 15's in his vlt manual. got 13.4 in the end i think, just knocked off my silver slapper, but head to head I won
Some original photos have not been recovered yet.
Does doing a big warmup skid on street tyres actually help grip?
People argue both ways... but I ran my best time not doing one...
What do u all think?
I think doing burnouts in street tyres does **** all for traction
the coefficient of friction might be similar, but street tyres have been designed to have optimum grip in street conditions. If you overheat your tyres, then you might find it skipping or loosing traction.
All depends on physics of the rubber material.
As for the sidewall crinkle, bigger rims generally have a lower profile.
the 15s would have a larger profile, but perhaps a lower sidewall STIFFNESS. are you talking about the sidewall stiffness, or size?
Amongst draggers at track events, those that i have spoke to is getting the rear as soft as possible is the key. stock springs help better than stiffer ones, and soft tyres. I think thats because the car will bog down on hard launches which could put too much pressure on the tyres and deformm them too much, so not as much grip. Just trying to get a physics model out of it
i think the 15s are the go, but ide have to run 225 walkies on the front, because of the bigger brakes, so more tyre drag, but better stopping!
Some original photos have not been recovered yet.
im having the same prob, im going to calder in my calais, and i wanna run a half decent time, but with my 17 x 8" tyres, i get **** all traction. they have plenty of rubber on them. the car only runs 10 psi and its a 5spd manual with no cooler, top of first spins and if i try and keep the boost on the gear change 2nd gear smokes all the way.. i hate it. i can tell im gunna get a **** time and be embarrassed!
The more surface area the better! So wider, low tyre pressure is better, but it's more to do with tyre compound. Softer tyres are better and usually more expencive, and so are 16", 17", 18" tyres. So people with big rims usually have harded tyres cos there cheaper!
So if ya got a few sets of tyres lying around and don't know what they are, trial and error is the best way!
Cheers.
Just to add my 2 cents
I used 215/65/15
let down to 15 psi
with my manual I sat there with the revs at 2700-3000
on the last yellow really ride that clutch till ya got some motivation then let it all hang out.
The very last run I ever did in my car I was told that the rims were spining inside the tyres, made a wierd whirring sound that I could never put my finger on.
I probably could have gone faster, who knows?
But if I had any more than 17psi in the tyres, I couldnt get off the line without fryin the ****ers.
man I miss that thing (sniff)
Have fun, do aas many runs as you can trying different revs, different clutch dumps/rides, after all, it's well and good to beat someone, but when you can say your car is quicker down the quarter, its a sweet justice, eh Kris.
Mua ha ha ha ha ha ha 13.4 baby, 13 point 4.
weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
bah traction never was on my side
I never got to use the full potential of my 3500 stall, its not too fun taking off slowly and then putting the power down only to find you still lose traction.
Oh well I have learnt not to take the strip on anymore without decent tyres, as for a manual VLT - good luck to most people getting traction
Some original photos have not been recovered yet.
..anyone seen the Performance Cars 6 video (I think its called), with the Sub Zero R33 GTst against a black VL with a twin cam RB30?
They have a couple of drags against the 2 cars. Off the line they have to basically crawl away so they have some grip - then at about 70kmh they lay into it and are both getting sideways smoking up the wheels :twisted:
...looks great.
Darkstar and others,
you don't have to really worry at Calder, because the first part of the track in traction compound treated (VHT?).
A good street tyre will grip really well. I've always done a little burnout but nothing spectacular.
My best time on cheap 215/60/15 GT radials half worn was a 12.48 @ 111mph.
Not much wheelspin to be had if you suspension etc is up to spec.
Drag slicks are the go though if you want good 60ft's. My 60ft's on street tyres was about 1.99. But on slicks it should be in the 1.7's
Cheers.
