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Author alloy sizes VS acceleration
MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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19th Jun 04 at 11:25   View User's Profile U2U Member Reply With Quote

ive got a modded corsa Gsi 1.6 16v, with zorst and viper kit etc, its a pretty quick little car!!

its got 14 inch gsi alloys at the moment with a diameter of roughly 42cm
i want some 17 inch alloys which will have a diameter of roughly 47cm...

which is a diffrence of just 5cm, (2 inches)
so will this really make any sort of difference to the acceleration and handling on my car???

[Edited on 19-06-2004 by MoNkEy MaGiC]
Drysdale
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Registered: 20th May 04
Location: Milton Keynes
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19th Jun 04 at 11:28   View User's Profile U2U Member Reply With Quote

Well....you'll lose some acceleration as the roll of the wheel is bigger...thus it takes longer for the wheel to go round. Steering will be affected slightly as the wheel has a bigger surface area, thus takes slightly longer to turn.
big eck
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Registered: 20th Apr 03
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19th Jun 04 at 11:33   View User's Profile U2U Member Reply With Quote

17's look good but are a bit of a bitch too fit unless they've gt a perfect offset, stick to a nice set of 16's, they look just as good and wont hamper the acceleration
Drysdale
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19th Jun 04 at 11:40   View User's Profile U2U Member Reply With Quote

As long as you're not totally slammed, then its not that much work. I'd say 17's was the absolute max you should go unless you're building a show car.
MoNkEy MaGiC
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19th Jun 04 at 11:41   View User's Profile U2U Member Reply With Quote

offset is ET45, 17x7, 205/40 tyre and im gonna do ALL arch work so it WILL be good fit the Gsi's are already a little lower anyway so wont lower it yet....but if i do it will be between 50-70mm

not toooo worried if i loose a "little" performace as i wil do further engine mods later on anyway so i dont mind

ive heard people with 17s with 1.6 engines dont really notice any major performance differences anyway

it does 0-60 in 8-9seconds, so how much am i looking at with 17s?

[Edited on 19-06-2004 by MoNkEy MaGiC]
Ian
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19th Jun 04 at 12:19   View Garage View User's Profile U2U Member Reply With Quote

It will be slower and you will need to lower it.
Drysdale
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19th Jun 04 at 12:53   View User's Profile U2U Member Reply With Quote

Its not really worth doing a 0-60 on 17s. Doubt you'd be impressed. If you're going for track days, keep your old 14s and just use the 17s all other times.
MoNkEy MaGiC
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Registered: 12th Apr 03
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19th Jun 04 at 12:59   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Drysdale
Its not really worth doing a 0-60 on 17s. Doubt you'd be impressed. If you're going for track days, keep your old 14s and just use the 17s all other times.


i dont use the car on tracks, and i dont race around on the roads either, just for normal driving really
Drysdale
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19th Jun 04 at 13:00   View User's Profile U2U Member Reply With Quote

Then you'll be fine on 17s. Go for it.
sfxer
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19th Jun 04 at 14:01   View User's Profile U2U Member Reply With Quote

you wont notice any difference apart from bumps seem bigger and harder!

i noticed no difference in speed, only way you would see the difference is if it was timed properly, and then your only talkin hundredths of a second over 0-60
MoNkEy MaGiC
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19th Jun 04 at 14:57   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by sfxer
you wont notice any difference apart from bumps seem bigger and harder!

i noticed no difference in speed, only way you would see the difference is if it was timed properly, and then your only talkin hundredths of a second over 0-60



yeah thats what i thought
coz the 17s are only slightly bigger in diameter and circumference compared to the alloys i got now so it cant efect it too much or be noticable!
sfxer
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19th Jun 04 at 15:00   View User's Profile U2U Member Reply With Quote

its also down to the weight and other factors, but like i say i doubt u'll notice anything
ultra_corsa
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19th Jun 04 at 18:36   View User's Profile U2U Member Reply With Quote

do 17"'s!!! just change em back to ur old ones for track days etc
Kris TD
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19th Jun 04 at 18:39   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by sfxer
you wont notice any difference apart from bumps seem bigger and harder!

i noticed no difference in speed, only way you would see the difference is if it was timed properly, and then your only talkin hundredths of a second over 0-60



i disagree, there was a huge differnce in speed when i took my old 17's off and put the standard rims back on, so much quicker.

dont forget the 17's will weigh like twice as much.
broster
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19th Jun 04 at 18:56   View Garage View User's Profile U2U Member Reply With Quote

gunna say the tame as kris, and his car has loadsa torque to more the 17's round lol, its not the size that matters as much its the weight of the alloy! if u really want 17's then pic some light ones. also i think 15's look alot better on a corsa than 17's
MoNkEy MaGiC
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Registered: 12th Apr 03
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19th Jun 04 at 19:03   View User's Profile U2U Member Reply With Quote

in wat way did it feel slower? lower, mid or upper rev range? or generally throughout?

the 17s im getting cant be too much more heavier than my current standard 14inch Gsi alloys surely??
Jambo
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Registered: 8th Sep 01
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19th Jun 04 at 19:29   View User's Profile U2U Member Reply With Quote

They make it slower but its not as bad as some people are making it sound.

I love this place
Marco The Corsa Man
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   19th Jun 04 at 20:43   View User's Profile U2U Member Reply With Quote

Ive no power steering and when I wrnt from 13" steels to 16" alloys I noticed that some big bumps nearly rip the wheel outa my hands, other times Ive had the car go into "scalectrix" mode where it just wants to follow a rut in the road. Bloody good fun tho, and tones and tones of feedback, just the way I like it
IntaCepta
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Registered: 25th Mar 02
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19th Jun 04 at 23:45   View User's Profile U2U Member Reply With Quote

from 13" to 16" i noticed a great difference in speed, especially low end pickup was shite!

but i guess u do notice a drop in acceleration throughout the range.

Kris TD
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20th Jun 04 at 08:05   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by MoNkEy MaGiC
in wat way did it feel slower? lower, mid or upper rev range? or generally throughout?

the 17s im getting cant be too much more heavier than my current standard 14inch Gsi alloys surely??


mainly bottom and top end

gsi alloys are lgithweight actually.
Russ
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Registered: 14th Mar 04
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20th Jun 04 at 08:09   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Jambo
They make it slower but its not as bad as some people are making it sound.

I love russ also
corsa5dr
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Registered: 12th Jan 03
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20th Jun 04 at 09:33   View User's Profile U2U Member Reply With Quote

Agree with Kris and Broster, the weight of the wheel will make a big difference. Also you will probably see a negative affect on the handling.
sfxer
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20th Jun 04 at 13:35   View User's Profile U2U Member Reply With Quote

on a 1.6 with good quality wheels you will hardly notice anything.

the difference will be more apparant on lower powered cars.
Keithie
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21st Jun 04 at 08:24   View User's Profile U2U Member Reply With Quote

when i put 17's on my gsi it seemed much slower. i wld look for 16's instead

 
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