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Tyre pressure's at the drags??? 

 

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Posted: Tue May 02, 2006 7:36 pm 
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i heard it is a waste of time to do a massive burnout on street rubber(becoz street tyre rubber doesnt get hot ) and all you should do is a qik burn out to burn off the water at to clean any s**t on the tyres...is this true
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Posted: Tue May 02, 2006 8:11 pm 
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i have tried both small and big burnouts, and yes there is bugger all difference in the launch afterwards, so yeah, no real need, in my experience anyway.

 

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Posted: Tue May 02, 2006 8:27 pm 
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i find if you do a big burnout that the tyre gets hot.
i just like to sit there and pop a good skid, the crowd looks at you the next time around, expecting another one.
im not sure if it helps for a better launch though.

 

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Posted: Tue May 02, 2006 10:37 pm 
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im pretty sure they covered this in zoom and droping the tyre pressure below 22psi(i think) was also useless
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Posted: Wed May 03, 2006 7:33 pm 
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40psi. My auto has no problem with traction off the line. Doing burnouts is always good fun though.

 

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Posted: Thu May 04, 2006 1:32 pm 
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yobboford wrote:
dropped pressure doesnt seem to effect top end speed, if it does i would imagine it is a very small drop, i might head out to wsid soon and give terreriost ghia's street slicks a go, see how much i can drop the 60' time with them. but because they are such a tall profile i think my 3.27 diff will really hold me back with them on.
hhhmmm... my previous best was 14.64 on 2.0 sixty footer 14psi in rear tyres... could not beat it...allways running low pressure in the rear tyres...lastnight at the creek i got 3 14.6s 2 14.7 n a 14.4! all 93-95.6 mph.. havent touched the engine at all... heres the twist.... i didnt touch the TYRE PRESSURE! still ran 3 2.0 sixty footer!!!! n my mph figure was on up average of 1-4 mph faster across the finnish line on all runs... more pressure =less rolling resistance?

 

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Posted: Thu May 04, 2006 1:33 pm 
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yobboford wrote:
dropped pressure doesnt seem to effect top end speed, if it does i would imagine it is a very small drop, i might head out to wsid soon and give terreriost ghia's street slicks a go, see how much i can drop the 60' time with them. but because they are such a tall profile i think my 3.27 diff will really hold me back with them on.
hhhmmm... my previous best was 14.64 on 2.0 sixty footer 14psi in rear tyres... could not beat it...allways running low pressure in the rear tyres...lastnight at the creek i got 3 14.6s 2 14.7 n a 14.4! all 93-95.6 mph.. havent touched the engine at all... heres the twist.... i didnt touch the TYRE PRESSURE! still ran 3 2.0 sixty footer!!!! n my mph figure was on up average of 1-4 mph faster across the finnish line on all runs... more pressure =less rolling resistance?

 

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Posted: Thu May 04, 2006 1:45 pm 
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fordfreak ef wrote:
yobboford wrote:
dropped pressure doesnt seem to effect top end speed, if it does i would imagine it is a very small drop, i might head out to wsid soon and give terreriost ghia's street slicks a go, see how much i can drop the 60' time with them. but because they are such a tall profile i think my 3.27 diff will really hold me back with them on.
hhhmmm... my previous best was 14.64 on 2.0 sixty footer 14psi in rear tyres... could not beat it...allways running low pressure in the rear tyres...lastnight at the creek i got 3 14.6s 2 14.7 n a 14.4! all 93-95.6 mph.. havent touched the engine at all... heres the twist.... i didnt touch the TYRE PRESSURE! still ran 3 2.0 sixty footer!!!! n my mph figure was on up average of 1-4 mph faster across the finnish line on all runs... more pressure =less rolling resistance?


I agree. I have thought this too, that more pressure = less resistance.

Either way, I don't think you should let your tyres down at all.

You don't do it on the street (and if you do, you should grab a mirror), so why do it on the strip? Unless you have a "dedicated" quarter car, what's the point? By doing s**t like that, it's not representative of what your car can do every day so why bother?

What ever blows you hair back, I suppose...
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Posted: Thu May 04, 2006 7:05 pm 
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yep i ran my car with 36 psi in the rears, spare wheel in the back along with tools and other assortments. wanted to see what she pulled straight off the street

 

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Posted: Thu May 04, 2006 7:13 pm 
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kezz wrote:
yep i ran my car with 36 psi in the rears, spare wheel in the back along with tools and other assortments. wanted to see what she pulled straight off the street


People take note. This is how it should be done.

Respect!
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Posted: Thu May 04, 2006 10:05 pm 
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i'm gonna test both normal and low pressure next time i'm up at willowbank.
i find that a half flat tyre creates alot of drag.

 

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Posted: Thu May 04, 2006 10:18 pm 
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kezz wrote:
yep i ran my car with 36 psi in the rears, spare wheel in the back along with tools and other assortments. wanted to see what she pulled straight off the street

yep same here. during scruitneering they didnt even say anything about all the s**t in the back of my car haha.
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Posted: Thu May 04, 2006 10:41 pm 
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smoke_rubber wrote:
i'm gonna test both normal and low pressure next time i'm up at willowbank.
i find that a half flat tyre creates alot of drag.
i think i proved taht low pressure in a street tyre =lots drag n 2-3 mph on average slower accross the line..

 

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Posted: Thu May 04, 2006 10:53 pm 
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yeh it seems like you have, but i want to test the theory out myself.

 

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Posted: Fri May 05, 2006 11:06 pm 
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i think there would be a good happy medium between more pressure =less resistance and less pressure=more resistance...with my old silvia it was harder to get a good sixty foot time with out dropping the pressure and traction would improve heaps with less pressure
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