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R32 Gtr Weights Splits

tacker

By tacker,
in Motorsport Discussion & Builds

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tacker Mentor

tacker

Posted
Posted

Guys,

any idea what a good weight distrabution for an R32 GTR is i have weighed mine and have roughly a 58% front / 42% rear split and a diagonal weight difference of 18 kgs with driver and fuel.

Anyone else played around with this?

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https://www.sau.com.au/forums/topic/254119-r32-gtr-weights-splits/
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Duncan Grand Master

Duncan

Posted
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about to do mine in the next few weeks....I will post up too. GTR is too nose heavy but we will do what we can.

I spoke to someone about this the other day - apparently all the super cars run lead because left to right balance is more important than overall weight...interesting to consider.

  • 2 weeks later...
tacker Mentor

tacker

Posted
  • Author
Posted

Ok another go at the corner weights this weekend.

With driver and full fuel load i got the following.

front left 415kg

front right 444kg

rear left 291

rear right 309

So that is a FR to RL total of 735 kg and a FL to RR of 724kg

I cant get it any better without moving some the gear already installed into the car, so next week i start cutting the fuel cell, pumps mounting brakets and fire extingister and getting them all to the rear left corner. Once i get that corner heavier i will be able be able to better balance out the entire car

  • 4 weeks later...
Duncan Grand Master

Duncan

Posted
Posted

Well as promised here are the results from mine.

First thing I notice is that your car is a full 100kg lighter than mine so well done. the numbers are pretty depressing but meh.

FL 433kg

FR 471kg

RL 307kg

RR 346kg

That gives me diagonal cross weights of 779.5kg vs 780.5kg. Nick has a pretty good eye for setting this up.

Ride heights to acheive that guard to bottom of wheel (with 17" wheels) is:

FL 570

FR 575

RL 565

RR 567

So basically they focus on getting the diagonal weights right because that is where the wieght shifts on your average corner turn in under brakes. He did this by managing the ride height at each corner not by moving stuff inside. And its amazing that .5cm of difference in ride height makes up for 38kg in weight difference.

Also its painful to note that the front to rear distribution is 904F to 653R = 60%F 40%R

So... FR takes 1.5x the weight of the rear right. so anyone that tells you that they need larger rear tyres on a gtr is very much on drugs. given that generally gtr owners run same size wheels all around, and that the main weight shift is under brakes, the fronts will always be the tyres working hardest (this matches with what I have seen in tyre wear and tyre pressures)

  • 2 weeks later...
warps Mentor

warps

Posted
Posted
. He did this by managing the ride height at each corner not by moving stuff inside. And its amazing that .5cm of difference in ride height makes up for 38kg in weight difference.

Exactly. I would have thought ride heights will have the biggest impact on the corneer weights. Remember, the chassis is meant to be rigid, so you can't really change corner weights any other way. Front to back is a different matter, so the more crap you can mount in the back, the better.

djr81 Grand Master

djr81

Posted
Posted

This stuff makes me cry.

Mine is still full weight ie stereo, interior etc with just a few things done to help matters eg HICAS.

Front is 905kg

Rear is 685kg.

Which gives a distribution of 57/43.

I should point out that I weigh 100kg with helmet etc.

Sorrt of explains why the things understeer so hard.

tacker Mentor

tacker

Posted
  • Author
Posted

yes duncan i have removed every bloody thing possible even down to alloy bolts if its not load bearing.

I plan to get a full T45 cage in over summer here and a wide body kit i have to do something to catch the bloody viper Z06 GT2 etc

  • 2 weeks later...

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