So how much does a GTR weigh?

[LuckyP]

Popped into work today to use the corner weight equipment.

Full tanks, all fluids in, all tools out but camera in situ. Now I would say that mine is on the lardy side. Over std equip I have a double din audio, lots of heavy insulation material, a carpeted interior possibly 30kg of extras. I'm pretty happy with it. The corner splits are another story, but that can wait.

Here's the score:





And here the weights minus driver:



And here with a lardy 93kgs of Lucky:




Check the difference between fronts!!!

[JakeR]

Nice Alloys! Are they new?

[qwick]

So, when you're in the car balance is better, that's good news. I reckon a few more pies and that weight balance will be perfect.

[qwick]

Actually, when you're in the weight balance at the back is better but the weight balance at the front is worse! I don't know what to suggest about pies now...

[craig7l]

hi mate,
whats your %target weight distribution F-R.
cheers

[LuckyP]

craig7l said:

hi mate,
whats your %target weight distribution F-R.
cheers

(In Tim Nice-but-dim style)

'Is there anything else you'd like to ask me?'

No seriously, it's pretty obvious that my corner weights (side to side) are way out.

I'll track it like it is, and then get a specialist to juggle the platforms. I'll probably want to get the ride heights near as poss to Fac rec. and then fine tune the side to side with me in as near as poss.

Anyone with a calc work out what the front/rear % is now (minus and plus moi?)

[LuckyP]

JakeR said:

Nice Alloys! Are they new?

[craig7l]

sorry.. should have implied what the factory guestimate F-R distribution target is designed around maybe 45/55 not your aim from here on in.
can see i may become an outcast so will tread very carefully

[LuckyP]

So car only it's 37% front 63% rear.

With me in it's 38% front 62% rear

My ride height is 115 front 140 rear. Fac rec is 110 front 160 rear. Guess that would make a difference.

Porsche boys have it soo easy!!!!

[San Diego GTR]

Thanks for doing this Pete. I've been meaning to get mine down and get some corner weights, but just haven't gotten around to it.

Am I reading this right, that the way to fine tune these weights is through ride height adjustments?

Paul

[LuckyP]

San Diego GTR said:

Thanks for doing this Pete. I've been meaning to get mine down and get some corner weights, but just haven't gotten around to it.

Am I reading this right, that the way to fine tune these weights is through ride height adjustments?

Paul

That is my understanding.

I'm researching it as I type.

[V8OWNER]

I reckon your nieghbour must already have known this and was helping you out with some of her own weight saving ideas...? (the other thread)...

[N2T]

Did you also turn the car around and re-weigh?

[LuckyP]

N2T said:

Did you also turn the car around and re-weigh?

No. Is that the done thing? Why?

(Please don't say to check the equipment)

[N2T]

All concrete slabs are not perfectly level, nor are they perfectly uniform in height across the entire pour. Since you have found a side-to-side bias in your car, I would turn her around to make sure only a small amount of that, if any, is explained by the floor or any other height issue amongst the four scales. One 180 answers any question. Sounds silly, but I would do it next time.

[craig7l]

LuckyP said:

San Diego GTR said:

Thanks for doing this Pete. I've been meaning to get mine down and get some corner weights, but just haven't gotten around to it.

Am I reading this right, that the way to fine tune these weights is through ride height adjustments?

Paul

That is my understanding.

I'm researching it as I type.

alter your platforms..a quarter turn will make a remarkable difference..

a good geo set will be 10times cheaper than just adding power to gain big lap time decreases..

[actuary]

At the Telford public weighbridge mine was 1020 kilos with a full tank (x2) of fuel. But I didn't have the wing.

[Knotty]

Here's a good and easy to understand article on corner weights.
http://grassrootsmotorsports.com/articles/understa...

[Fat Arnie]

Looks to me as through the left front and right rear need the platform height raised slightly.

The lack of weight on the front end probably explains the GTR's tendency to have the front run wide when really pressing on. An overall increase in height at the rear (raising the rear or lowering the front) should get more weight transfered to the front of the car.

Also, the understeer can be eliminated by unsettling the car by giving the rear axle a bit (1mm) of toe out.

Just my 2p. Haven't tried this theory on an Ultima though.

[Barry Ashcroft]

LuckyP said:

I'll track it like it is, and then get a specialist to juggle the platforms. I'll probably want to get the ride heights near as poss to Fac rec. and then fine tune the side to side with me in as near as poss.

If your intending on using it on the track don't with those figures. Get it done before it will make a huge difference to the handling. If anything happens on track you will kick yourself for not getting it done first.