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best tyre pressure for 1/4 mile?? 

 

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 Post subject: best tyre pressure for 1/4 mile??
Posted: Mon Mar 16, 2009 1:48 pm 
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I have 235/45/r17 on all fours and wondering what tyre pressures are best for launching.

my first attempt at drags i still had the road pressure 42psi and spun the wheels.

Is it a compromise between good launch and top speed, or just a waste of time. (i'm not going to buy different tyres like slicks either)
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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Mon Mar 16, 2009 2:27 pm 
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Try dropping the pressure down to say 38 and do a run on that. If your still breaking traction, try 35 and so on. Best not to go too low or you'll bog down a bit.

 

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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Mon Mar 16, 2009 2:34 pm 
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Drop it to 32, go down from there, I found anything lower then about 24 is counter productive, with a street radial anyway.

 

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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Mon Mar 16, 2009 11:11 pm 
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And there's no point in doing a burnout in a single spinner, because its just gonna spin the cold tyre anyway? correct?

(but i have noticed that it always goes for the right tyre on burnout, so If I do one, that might confuse it and grip it) :roll:

but yeah i saw in another thread that doing a burnout in a single spinner is laughed at anyway.
thoughts. cheers
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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Mon Mar 16, 2009 11:34 pm 
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rdiigen wrote:
And there's no point in doing a burnout in a single spinner, because its just gonna spin the cold tyre anyway? correct?

(but i have noticed that it always goes for the right tyre on burnout, so If I do one, that might confuse it and grip it) :roll:

but yeah i saw in another thread that doing a burnout in a single spinner is laughed at anyway.
thoughts. cheers


Drive around the water/burnout pit.

Street tyres, don't get stickier when smoked up, they generally go greasy (i.e. worse).

 

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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Tue Mar 17, 2009 9:41 am 
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Yeah drive around with a single pegger, it's just annoying at the drags when someone with a single pegger does a burnout, because their other tyre ends up dragging water out of the pit, which reeks havoc on other C*** with stock ford LSDs :lol:

What car is this? mods etc?
Because if it's manual or anything with a decent amount of power the SS is gonna be holding you back, no matter how much playing with tyre pressure you do.

 

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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Tue Mar 17, 2009 1:52 pm 
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i find anythin under 25 psi in my street tyre's and you start losing mph..

 

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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Tue Mar 17, 2009 1:54 pm 
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I was playing round with tyre pressures a bit the other week, and found that about 34 psi hooked up pretty well compared to the 40psi I run normally in my 235/45/17s. Anything over 40 I found I could just bake the rears with minimal effort, and much below 32 psi just felt sloppy, and no doubt bad for the tryes.
This wasnt on the strip mind you, just down the street mucking round.

 

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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Tue Mar 17, 2009 4:30 pm 
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i was driving around the pit, knew burnout wouldnt help me.

My car is an auto six, nothing major. Tighe 826 cam running on factory ecu, not tuned, Intake mods and full mock exhaust, 3.45. My best was 15.881 / 90.58mph (react 0.518, 60ft 2.574)

On another note, whoever picked up that xr6 whole diff from northside wreckers in brisbane a couple of weeks back for $350, you suck!! :mrgreen: that had my name written all over it..
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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Tue Mar 17, 2009 10:39 pm 
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rdiigen wrote:
i was driving around the pit, knew burnout wouldnt help me.

My car is an auto six, nothing major. Tighe 826 cam running on factory ecu, not tuned, Intake mods and full mock exhaust, 3.45. My best was 15.881 / 90.58mph (react 0.518, 60ft 2.574)

On another note, whoever picked up that xr6 whole diff from northside wreckers in brisbane a couple of weeks back for $350, you suck!! :mrgreen: that had my name written all over it..


somethings definitely wrong there..i ran 15.3 in my ef ghia with just exhaust and homemade intake (also with the lsd) its now got a massive cam, but no new time yet.
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 Post subject: Re: best tyre pressure for 1/4 mile??
Posted: Wed Mar 18, 2009 1:17 pm 
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I run 24psi with my 18s. The best 60 footer I've got so far is 1.9 sec. That's with 3.73s

 

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