hadyn Posted June 12, 2005 Share Posted June 12, 2005 Got a 13.5s 1/4 at the pod yesterday which Im pretty pleased with. Im now looking to reduce my 1/4 times futher after removing spare wheel, pulling trac fuse etc and im considering wheel options. Am i right in thinking that I may get a quicker 1/4 time if i run with say the stock 16" j-spec wheels than the big and wide 18s that I currently run with? I presume i'd also get quicker times if the rears on the 16s were shod in drag radials or slicks? Cheers! Link to comment Share on other sites More sharing options...
MONKEYmark Posted June 12, 2005 Share Posted June 12, 2005 they run smaller wheels to get more tyre for grip. buy a set of stock wheels and some drag radials. Link to comment Share on other sites More sharing options...
Matt T Posted June 12, 2005 Share Posted June 12, 2005 Narrower tyres = less grip though, so i guess its a balance. Link to comment Share on other sites More sharing options...
adi2009 Posted June 12, 2005 Share Posted June 12, 2005 Narrower FRONT tyres = less drag = quicker 1/4 mile time Link to comment Share on other sites More sharing options...
hadyn Posted June 12, 2005 Author Share Posted June 12, 2005 they run smaller wheels to get more tyre for grip. buy a set of stock wheels and some drag radials. im on the case, i've heard drag radials can put strain on transmission components tho - gearbox,clutch drivetrain etc. How accurate is this - can the stock supra autobox/driveshafts etc take it? Currently running bpu spec on stock tubbies Link to comment Share on other sites More sharing options...
adi2009 Posted June 12, 2005 Share Posted June 12, 2005 Hard launches from drag radials will put more strain on the drivetrain but you should be fine. I ve just head ppl say not to launch with drag radials with the 5spd tranny from the NA supra. (so i better stay far from that route till i put in a 6spd) Link to comment Share on other sites More sharing options...
hadyn Posted June 12, 2005 Author Share Posted June 12, 2005 will stock 16s and road tyres reduce my 1/4s much? Link to comment Share on other sites More sharing options...
adi2009 Posted June 12, 2005 Share Posted June 12, 2005 I Would not be able to give u a straight YES or NO answer for this Q but will explain the theory behind smaller wheels. When u run smaller wheels, say 16" there is more rubber between the wheel and the road (profile) and hence there is more flex when u launch and this helps reduce wheelspin marginally. Whereas, when u are runnin 19" or so there is less rubber between the wheel and road and hence if u do a hard launch wheelspin would be greater due to power being transferred faster due to the absence of the 'flex'. So theoretically you will lose time when running large wheels and low profile tyres because it will promote wheelspin when lauching. Link to comment Share on other sites More sharing options...
Matt T Posted June 12, 2005 Share Posted June 12, 2005 I would think its pretty complicated and hard to give a definitive yes/no unless someone has already tried it. Dont forget the weight of the wheels also, lighter wheels will mean less unsprung mass and so greater acceleration. Lower tyre pressures for the reason above. Link to comment Share on other sites More sharing options...
JohnA Posted June 12, 2005 Share Posted June 12, 2005 Is yours manual or an auto? If it's an auto, I'd try the smaller tyres mate, as the stock gearing is already abysmally long... Link to comment Share on other sites More sharing options...
hadyn Posted June 12, 2005 Author Share Posted June 12, 2005 auto mate Link to comment Share on other sites More sharing options...
JohnA Posted June 12, 2005 Share Posted June 12, 2005 If you stretch 4th gear into the red, it is good for 220-odd mph, isn't it? What were they thinking FFS? I haven't yet done such a run on the soop, but I'd think that you really want the 1/4mile to end with 3rd gear in full blast, so if smaller wheels help towards that, it's worth a shot IMO. As for the smaller frontal area of the (slightly) narrower tyres, I don't think it will make a measurable difference in 1/4mile times, traction variances will be much more important. Link to comment Share on other sites More sharing options...
MONKEYmark Posted June 12, 2005 Share Posted June 12, 2005 im on the case, i've heard drag radials can put strain on transmission components tho - gearbox,clutch drivetrain etc. How accurate is this - can the stock supra autobox/driveshafts etc take it? Currently running bpu spec on stock tubbiesany sticky tyres will put strain on drivetrain. you cant expect to get good times if you dont give it some off line. you will sure know when to launches real good. if you break auto gearbox you can pick up a spare box as there is so many about. you will find street tyres are only so good. my best time on street tyres is 12.5 and best ever 60foot on street tyres is 2.050 Link to comment Share on other sites More sharing options...
eyefi Posted June 12, 2005 Share Posted June 12, 2005 If you stretch 4th gear into the red, it is good for 220-odd mph, isn't it? how far into the red? Link to comment Share on other sites More sharing options...
MONKEYmark Posted June 14, 2005 Share Posted June 14, 2005 i thought the auto was geared for 196mph looks like john been watching star trek the next generation lol Link to comment Share on other sites More sharing options...
Bobbeh Posted June 14, 2005 Share Posted June 14, 2005 196 with a manual diff right? I think in standard form you'll be lucky to get near 190. Link to comment Share on other sites More sharing options...
JohnA Posted June 15, 2005 Share Posted June 15, 2005 i thought the auto was geared for 196mph looks like john been watching star trek the next generation lol Yeah, like that guy wearing the K&N filters for glasses Actually the 220 figure I got from this forum somewhere, but looks roughly correct on my speedo as well (you know, check the revs in 4th gear at 110mph, and then multiply by two) Perhaps I should have added 'indicated' (I doesn't take much knowledge on cars to know that long gearing doesn't mean jack, if you haven't got the horsepower to pull through it. Toyota here did it for mpg purposes I'd imagine, if they had geared the car 10% shorter it would have been faster overall) Link to comment Share on other sites More sharing options...
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