Corner Weighting

Wheels, Suspension, Brakes & Tyres questions and answers

Moderators: timk, Stu, zombie, Andrew, -alex, miata

User avatar
SKYHI
Racing Driver
Posts: 1355
Joined: Sun Apr 01, 2007 8:08 am
Vehicle: NB SE
Location: Brisbane

Corner Weighting

Postby SKYHI » Thu Sep 23, 2010 10:09 am

Finally got around to corner weighting my car last night. Topped the fuel up to half a tank, set the tyre pressures to 30psi all round and put 70kg of ballast into the drivers seat and footwell.

The car was actually pretty good in terms of cross weights, with an initial reading of 51% LF/RR and 49% RF/LR. The big surprise for me was the total weight of 1036kg including driver and half a tank of fuel (essentially 966kg without driver). The only other time I'd had it on the scales was at it's first race meeting just over 12 months ago and it weighed in at just on 1000kg without driver and half a tank of fuel, so I'd managed to take 34kg out of the car somehow. I had removed a few things and installed lightened flywheel etc but never thought it would be near that amount. I'm wondering how accurate the scales at Morgan Park are?

Anyway, after spending an hour tweaking the car we actually ended up pretty close to the original reading with cross weight percentages of 50.9% LF/RR and 49.1% RF/LR. We could have got it a bit closer to 50/50, but it would have meant changing the ride heights too much. Eventually I will buy a lighter battery to replace the existing battery and move it to the passengers side of the boot. This should give me a total weight of about 960kg without driver and very close to 50/50 cross weights.

Here's what we ended up with:

Image

manga_blue
Forum Guru
Posts: 4897
Joined: Mon Apr 24, 2006 7:27 pm
Vehicle: NA8
Location: Moruya, NSW

Re: Corner Weighting

Postby manga_blue » Thu Sep 23, 2010 11:10 am

The left/right split is really interesting too, isn't it? Should we all stay off anti-clockwise tracks?
’95 NA8

User avatar
SKYHI
Racing Driver
Posts: 1355
Joined: Sun Apr 01, 2007 8:08 am
Vehicle: NB SE
Location: Brisbane

Re: Corner Weighting

Postby SKYHI » Thu Sep 23, 2010 11:31 am

manga_blue wrote:The left/right split is really interesting too, isn't it? Should we all stay off anti-clockwise tracks?


To be expected with 70kg in the drivers seat I guess :D

Just lucky that there aren't too many anti clockwise tracks in Australia, just Eastern Creek and PI.

User avatar
Guran
Speed Racer
Posts: 3754
Joined: Sun Feb 15, 2009 6:42 pm
Vehicle: ND - 1.5
Location: Albion Park NSW
Contact:

Re: Corner Weighting

Postby Guran » Thu Sep 23, 2010 1:22 pm

TCR wrote:Just lucky that there aren't too many anti clockwise tracks in Australia, just Eastern Creek and PI.

And Bathurst. Yep, just the three best circuits in Australia! Bugger.
Standard 2006 NC - YouTube
WP 1:11.89 | SMP-S 1:05.90 GP 1:54.93 N 1:18.09 L 2:22.49 | PW 1:02.52
PI 2:00.55 | W-S 1:12.44 W-L 1:43.36 | SR 1:33.25

rascal
Racing Driver
Posts: 1770
Joined: Fri May 16, 2008 1:39 pm
Vehicle: NB8A
Location: FarSE Melbourne

Re: Corner Weighting

Postby rascal » Thu Sep 23, 2010 1:44 pm

Guran wrote:
TCR wrote:Just lucky that there aren't too many anti clockwise tracks in Australia, just Eastern Creek and PI.

And Bathurst. Yep, just the three best circuits in Australia! Bugger.

And Sandown, though it certainly isn't in the best circuits list in Oz !


Return to “MX5 Wheels, Suspension, Brakes & Tyres”

Who is online

Users browsing this forum: No registered users and 138 guests