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fordfreak ef
Cruise Moderator
Age:26
Posts: 9186
Joined: 17 Apr 2005
Location: glenwood/sydney NSW, Australia
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 Posted: Thu May 04, 2006 12:32 pm Post subject: |
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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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fordfreak ef
Cruise Moderator
Age:26
Posts: 9186
Joined: 17 Apr 2005
Location: glenwood/sydney NSW, Australia
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| Posted: Thu May 04, 2006 12:33 pm Post subject: |
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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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downingj
Fordmods - Getting Side Ways
Posts: 3010
Joined: 28 Oct 2005
Location: Wynyard TAS, Australia
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| Posted: Thu May 04, 2006 12:45 pm Post subject: |
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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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kezz
Fordmods - Getting Side Ways
Age:21
Posts: 2216
Joined: 05 May 2005
Location: blu mtns NSW, Australia
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| Posted: Thu May 04, 2006 6:05 pm Post subject: |
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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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downingj
Fordmods - Getting Side Ways
Posts: 3010
Joined: 28 Oct 2005
Location: Wynyard TAS, Australia
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| Posted: Thu May 04, 2006 6:13 pm Post subject: |
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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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smoke_
Cruise Moderator
Age:24
Posts: 5834
Joined: 05 Nov 2004
Location: Brisbane QLD, Australia
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| Posted: Thu May 04, 2006 9:05 pm Post subject: |
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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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eed-250
Fordmods - Getting Side Ways
Posts: 1596
Joined: 05 Nov 2004
Location: Perth WA, Australia
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| Posted: Thu May 04, 2006 9:18 pm Post subject: |
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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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fordfreak ef
Cruise Moderator
Age:26
Posts: 9186
Joined: 17 Apr 2005
Location: glenwood/sydney NSW, Australia
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| Posted: Thu May 04, 2006 9:41 pm Post subject: |
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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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smoke_
Cruise Moderator
Age:24
Posts: 5834
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Location: Brisbane QLD, Australia
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| Posted: Thu May 04, 2006 9:53 pm Post subject: |
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| yeh it seems like you have, but i want to test the theory out myself. |
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elrob
Fordmods Parts Gopher
Age:29
Posts: 82
Joined: 03 Apr 2006
Location: gladstone QLD, Australia
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| Posted: Fri May 05, 2006 10:06 pm Post subject: |
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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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Epitome
Fordmods Stock as a Rock
Age:36
Posts: 196
Joined: 05 Nov 2004
Location: Manjimup WA, Australia
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| Posted: Sun May 14, 2006 1:30 am Post subject: |
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| elrob wrote: | | 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 |
Exactly.
You should start off at normal street pressure. Then work down a couple of psi at a time. As soon as your times and mph stop improving, that is the ideal pressure for your setup.
With our dragster we change the pressure by 1/2 or 1/4 psi increments. |
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