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yobboford
Fordmods - Getting Side Ways
Age:34
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 Posted: Fri Feb 24, 2006 8:52 pm Post subject: Tyre pressure's at the drags??? |
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hey peeps,
what does everyone run in the way of tyres and pressure when running the quater mile???
i have been runnning 215/65r14 kuhmo's dropped to 20psi and i am managing a 2.1 sixty foot time in the heavy a*** wagon, thats dumping it at around 3000rpm with a 3.27limo diff.
any other tips and tricks to get off the line better? |
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smoke_
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| Posted: Fri Feb 24, 2006 9:58 pm Post subject: |
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i ran a 2.1 in my ute with 38psi in the rear and it launched quite well (255x40x17)
I usually put the front tyres up to their max to reduce drag that small bit. every small thing counts.
my ef manual did best (2.2) 60 footer with 225/60/15 tyres with 38psi also.
i will have to experiment with tyre pressures next time im up at the drags.
Does the low rear psi hurt your top end speed as you cross the line yobbo? |
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fordfreak ef
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| Posted: Fri Feb 24, 2006 10:03 pm Post subject: |
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| i run around 14psi for the rear tyres... 235/40/18s.. 32 psi up front... smoke the rear wheels up good too... 3200rpm clutch dump/feed.. |
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Disco Frank
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| Posted: Sat Feb 25, 2006 1:55 am Post subject: |
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dropping the rear tyre psi allows for more traction off the line 
alowing the car to launch harder and improve ets
i ran my 14.9's with low rear tyre pressures
basically dropped em to 16-18psi before i left for the drags and then ran it liek that... then about 8 runs later when the tyres were well warm i got the 2 14.9's! |
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eed-250
Fordmods - Getting Side Ways
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| Posted: Sat Feb 25, 2006 3:47 pm Post subject: |
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um i run 225/50/r16's
at about 35 psi and 2.108 60'.
slip clutch @ 4000rpm.
i dropped the pressure a couple of times on my other tyres and it didnt make much of a differnece. |
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TerroristGHIA
Fordmods - Getting Side Ways
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| Posted: Sat Feb 25, 2006 5:18 pm Post subject: |
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My street 255/40/17 I run 25PSI and get 2.1 60ft with no Gas, and on the street slicks 235/60/15 i run 22PSI and get 1.8560ft times On NOS. SO am happy. Any lower than 20PSI on street rubber is a waste as the centre of the Tyre Colapses and this puts too much stress on the Side walls.
Brett |
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yobboford
Fordmods - Getting Side Ways
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| Posted: Sat Feb 25, 2006 5:43 pm Post subject: |
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| 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. |
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ea_5_spd
Fordmods Stock as a Rock
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| Posted: Thu Mar 02, 2006 7:41 pm Post subject: |
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| ride the clutch not drop it |
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XR8Chic
Fordmods - Getting Side Ways
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| Posted: Sat Mar 18, 2006 5:52 am Post subject: |
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Havent been to the drags for a while, but I always dropped the tyre pressure to 25psi if I was running on 18's, or 18psi for smaller rims.
I have had the tyres come off the rims too many times - got paranoid about dropping pressures.
This is a short vid filmed at the old eastern creek drags - and it shows a difference in your launch between a car that dropped tyre pressures (me) and a guy that said he didnt need to drop the tyre pressure (chrispy from fordforums)
http://www.xr8chic.com/images/drags/edxr_mustang.mpg
( |
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dc_todd
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| Posted: Sat Mar 18, 2006 7:31 am Post subject: |
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that vid shows nothing 2 different car like trying to compare apples and oranges...
But I believe in the schooling previously stated that under 20 psi is a waste as the centre collapses and the side walls are what end up doing the work, too much tyre distorsion.. all that good rubber you paid for in the centre of the tyre is not being used and side walls are s**t to drive on.. |
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XR8Chic
Fordmods - Getting Side Ways
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| Posted: Sat Mar 18, 2006 10:08 pm Post subject: |
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DC Todd - I disagree with you.
Both cars are RWD V8 Fords.
The mustang SHOULD have kicked my a**, but he "knew better", and didnt drop his tyre pressures.
After that run, he borrowed my tyre pressue guage, and dropped them, then dropped 3 seconds off his ET |
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yobboford
Fordmods - Getting Side Ways
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| Posted: Mon Mar 20, 2006 9:00 pm Post subject: |
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i know this picture is of a holden, but, check out the slicks hooking up, 12psi in them, 6000rpm drop of the clutch. now that is traction...
oh and for the record he did a 12.45@110.6mph, unopened LS1 M6, race weight of 1655kg including driver, just with edit by d**k electronics, pacemakers and exhaust, over rad intake, diff gears and clutch, and the slicks of cause. |
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smoke_
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| Posted: Mon Mar 20, 2006 9:40 pm Post subject: |
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for a pretty placid looking vt, it sure is launching well. |
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eed-250
Fordmods - Getting Side Ways
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| Posted: Tue Mar 21, 2006 3:58 pm Post subject: |
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yeah ther is a slight differnece between slicks and street rubber tho 
anything under 20psi is a waste of time.
and xr chic. he knocked 3 seconds off his 1/4 time by reducing tyre pressure? lol i might have to try that next time. might be able to run a 11 |
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XR8Chic
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| Posted: Tue Mar 21, 2006 10:38 pm Post subject: |
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eed - yeah - he ran a 17 second pass the first time (the one in the vid)
His 2nd run was a mid 14. |
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elrob
Fordmods Parts Gopher
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| Posted: Tue May 02, 2006 6:36 pm Post subject: |
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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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yobboford
Fordmods - Getting Side Ways
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| Posted: Tue May 02, 2006 7:11 pm Post subject: |
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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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smoke_
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| Posted: Tue May 02, 2006 7:27 pm Post subject: |
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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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elrob
Fordmods Parts Gopher
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| Posted: Tue May 02, 2006 9:37 pm Post subject: |
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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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fnp
Fordmods - Getting Side Ways
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| Posted: Wed May 03, 2006 6:33 pm Post subject: |
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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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