Patrick
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Registered: 25th Apr 02
Location: SE London
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What I don't understand is how you can have the same car go up a 1/4 mile strip but get completely conflicting times!
You could go up the strip say 5 times and get a average 1/4 of 15.7 @ 94mph with 16" alloys
Then go up 5 times with 14" alloys and get an average 1/4 of 15.2 @ 84mph
What I don't get is that with the smaller wheels the acceleration is greater so you cover the 1/4 mile distance over a quicker time but at the end your terminal speed is lower than when you cover it with the same power but with 16" alloys and with a slower 1/4 mile time.
Anyway. I went to Santa Pod twice both times with the same engine power. The first time I went with my 16" wheels on and had 5 runs, all of which were between 15.7 secs or 15.9secs and all terminal speeds were either 93mph or 94mph. The next time I went I put my original 14" alloys back on and my 1/4 mile times were significantly quicker all between 15.2secs and 15.4secs but what I don't get is why my terminal speeps were quite a bit slower than before even though my 1/4 mile times were quicker. All of these terminal speeds were either 84mph or 85mph.
I would of thought if you had a faster 1/4 mile time that would mean you were accelerating faster and in turn would be gaining speed faster and in turn would give you a higher terminal speed. I can't think of any logical reason why my terminal speed is lower but my 1/4 mile time is faster! 
[Edited on 04-04-2003 by Patrick]
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scottscorsa
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Registered: 24th Apr 02
Location: Scotland,Greenock
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timing gear may be fooked or just not super accurate
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by Stuckey
different varibles each time e.g. wind blowing temp of wheels, temp of track,
p.s. i know nothing about this sort of thing just a thought
Thankyou.
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Stuckey
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Registered: 5th Jun 02
Location: Plumstead, Greater London
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direction wind was blowing?
track temp?
tyre temp?
weight of wheels?
type of tyre?
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by 3CorsaMeal
Bigger wheels have a greater rolling radius so u get a higher top speed, but slower acceleration.
Cos u r accelerating faster with smaller wheels, u finish b4 u got the chance to get to higher speeds.
Its only 10mph over 0.5 secs...
Thankyou
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by Sethion33
Maybe its cos the bigger wheels give u a bigger top end speed, n the quarter mile is long enough it to make a dif? smaller wheels make u accelerate faster but give u a slower top end-just a thought....
Thankyou
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by Cybermonkey24
ok patrick, it could be just simply down to the fact that with 16' wheels on, you cant accelerate as fast, but once you over a certain speed, the rolling radius of the wheel comes into its own and gives a higher top speed. With 14's it is sheer acceleration thats giving you the best times, but are running out of effective speed. Try using 15's to get a mix of both the qualities of each wheel size.
Dave
[Edited on 04-04-2003 by Cybermonkey24]
Thankyou
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Hillzlo
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Registered: 9th Nov 02
Location: Noitacol
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Patrick, your a gimp.
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Sooty
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Registered: 9th Mar 03
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I suck eggs
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Patrick
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Registered: 25th Apr 02
Location: SE London
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Lads, keep it serious. Thats why I deleted the other post.
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Sooty
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ok... I think its a combination of above... but more or less the fact that you are running quicker on the track hence not achieving a higher speed because you are quicker to complete your run.
I think that is correct.
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Patrick
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Registered: 25th Apr 02
Location: SE London
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But surely the quicker you are going the faster you are getting? 
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Sooty
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nah.. because your acceleration is quicker, so you finish the run before you hit the higher speeds (90mph+)
hard to get your head round it, I dont even understand it myself 
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Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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quote:
Originally posted by Patrick
But surely the quicker you are going the faster you are getting?
thats my thinking also
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Sam
Moderator
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Registered: 24th Dec 99
Location: West Midlands
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Patrick - why don't you ask this question on MIGWEB you will get better answers there than on here about this sort of thing!
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Hillzlo
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Location: Noitacol
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Super_si
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Registered: 4th Mar 01
Location: lurkin' somewhere........................
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Shit Driver.
Sorted next question.......
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by Sooty
nah.. because your acceleration is quicker, so you finish the run before you hit the higher speeds (90mph+)
hard to get your head round it, I dont even understand it myself
If that was the case, wouldn't Skyline's that do 1/4's in say 12.5secs have a terminal of about 35mph?
Can't be right. I cannot think of any logical solution to this
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Sooty
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Registered: 9th Mar 03
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hmmm im not sure... still trying to think it out. Maybe external conditions or something
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Stuckey
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Registered: 5th Jun 02
Location: Plumstead, Greater London
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different trye pressures?
16" had correct tyre pressure
where as 14" had lower tyre pressure?
maybe???????
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Sooty
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Registered: 9th Mar 03
Location: FLAP CENTRAL
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Dont you find 16's are shite for pulling away on. My corsa is balls with the 16's on compared to 14's
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by Super_si
Shit Driver.
Sorted next question.......
A consistant shit driver? Yeah right!
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by Sooty
Dont you find 16's are shite for pulling away on. My corsa is balls with the 16's on compared to 14's
Saying that I was getting .2 and .3 reaction times with my 16's on and couldn't manage a reaction time better than .7 and .8 with the 14's. Probably down to the fact that I have very good tyres on the 16's and shitty standard tyres on the 14's.
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Sooty
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hmm... what rubber you use... Im runnig AVS sport, tread is massive
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Patrick
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Registered: 25th Apr 02
Location: SE London
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Dunlop 195/40/16's. Very good tyres! 
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