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Vote for Setup 8317    New Setup for Nissan Xanavi Nismo GT-R (JGTC)      
Setup ID
Tuner
Make
Car
Model Year
Track
Votes
Views
Horsepower
Best Lap
Date Entered
Last Modified
8317
2003
Circuit de la Sarthe I
2
3699
842
 
05/19/2010 10:14 PM
05/23/2010 10:14 PM  
Muffler Racing Suspension Racing
Racing Chip Normal Transmission Full Customize
NA Tune None Clutch Standard
Front Tires R3 - Medium Flywheel Standard
Rear Tires R3 - Medium Carbon Driveshaft None
Nitrous None GT Auto - Wing None
Turbine Kit Stage 4 Limited Slip Full Customize
Intercooler None AYC None
Supercharger None VCD None
Brakes Normal Weight Reduction None
Brake Controller Equipped Increase Rigidity None
Setup Item Front Rear Setup Item Front Rear
Spring Rate 14.8 13.8 Stabilizers 5 3
Ride Height 70 71 Brake Balance 5 3
Shock Absorbers Downforce 40 50
Shock Bound 8 7 LSD Init. Torque 10
Shock Rebound 6 8 LSD Acceleration 35
Camber Angle 2.8 1.0 LSD Deceleration 45
Toe Angle -1 0 Nitrous
1st 2nd 3rd 4th 5th 6th Final Auto Set
0.720 18
ASM
Oversteer
ASM
Understeer
TCS Ballast
Balance
Ballast
Weight
AYC VCD
0 0 4 0 0
Can be used for SartheII as well.


PSN: StigsTC
Joined: 01/20/2009
Last on: 08/29/2016
Setups: 67
Posts: 1192
Posted 05/20/2010 12:36 AM Post a reply Quote this post View StigsTibecuadorianco's info
I notice the rear stabilisers are 2 points lower than the front, is this to increase tire life, or is it to improve the speed of the car. I'd have never thought of using such settings...
Also, would it be worth while to dop the rear brake balence to 2, in order to get better life, or is it evenly balenced?
StigsTC
My full schedule B-spec guide and setups to the FGT (GT4)

100% all gold in GT4, GT5 and GT6. At last.

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Posted 05/20/2010 2:08 AM Post a reply Quote this post View Fumes's info
StigsTibecuadorianco wrote:
I notice the rear stabilisers are 2 points lower than the front, is this to increase tire life, or is it to improve the speed of the car. I'd have never thought of using such settings...


Unibrow
I'm letting you in on secret stuff now Ninja Master
It increases grip during acceleration. It <might> translate to increased tire life, as it hopefully reduces wheelspin.

StigsTibecuadorianco wrote:
Also, would it be worth while to drop the rear brake balance to 2, in order to get better life, or is it evenly balanced?
StigsTC


No don't change brake balance or it throws out the way the car handles during hard braking.
If you change rear brake balance it means having to revisit shocks, stabilizers, LSD again.

You will also reduce the stopping power of the car.

In short, Nah don't do it.

PSN: StigsTC
Joined: 01/20/2009
Last on: 08/29/2016
Setups: 67
Posts: 1192
Posted 05/20/2010 6:47 AM Post a reply Quote this post View StigsTibecuadorianco's info
I always though stabilizers were like 'anti-roll bars' in V8 supercars, in that they act laterally (side to side) and had no bearing on the longditudal movement... Everything I have known about suspension may have to be revised...
Now I have to go back to my Xanavi and fix some issues.
StigsTC
(Thanks heaps for your sercet tips!)
My full schedule B-spec guide and setups to the FGT (GT4)

100% all gold in GT4, GT5 and GT6. At last.

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Last on: 10/16/2016
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Posted 05/20/2010 9:24 PM Post a reply Quote this post View Fumes's info
StigsTibecuadorianco wrote:
I always though stabilizers were like 'anti-roll bars' in V8 supercars, in that they act laterally (side to side) and had no bearing on the longditudal movement... Everything I have known about suspension may have to be revised...
Now I have to go back to my Xanavi and fix some issues.
StigsTC
(Thanks heaps for your sercet tips!)


Not 100% correct.

Yes, stabilizers are anti roll bars. They have the most effect laterally, but also have some (small) longitudinal effect.

If you don't have a stabilizer bar, you tend to have a lot of trouble with body roll in a turn.

If you have too much stabilizer bar, you tend to lose independence between the suspension members on both sides of the car. When one wheel hits a bump, the stabilizer bar transmits the bump to the other side of the car as well, which is not what you want. The ideal is to find a setting that reduces body roll but does not hurt the independence of the tires.

The above is how I found increased grip with this car. On a high speed bumpy track like Sarthe it's good to reduce the rear stabilizers.

PSN: StigsTC
Joined: 01/20/2009
Last on: 08/29/2016
Setups: 67
Posts: 1192
Updated 05/21/2010 5:20 AM Post a reply Quote this post View StigsTibecuadorianco's info
AH, makes perfect sense now.
I've had stabilizer issues with curbs on one side of the car resulting in the entire front end getting air, however why using low stabilizers at La Sarthe is benefitial, I'd have not thought of.
What is your time at La Sarthe in a race mode? I've run my updated Sarthe I tune, and achieved a 3'24.601, however my downforce is set at 44/49, and ballast set to 86kgs @ -20. It achieves 200 A-spec against the Sauber C 9, mazda 787B, Toyota GT one, and nissan R92CP and nissan R89C.
I'm just trying to get a read on how close I am, or how much more tuning I need to do.
Thanks,
StigsTC
Actually, best that I go do the driving, kind of makes no sense for you to do it...
My full schedule B-spec guide and setups to the FGT (GT4)

100% all gold in GT4, GT5 and GT6. At last.

PSN: StigsTC
Joined: 01/20/2009
Last on: 08/29/2016
Setups: 67
Posts: 1192
Updated 05/28/2010 6:56 AM Post a reply Quote this post View StigsTibecuadorianco's info
I used Auto set 17, it could be 18, not sure...
Actually, I think it needs to be AT LEAST 18
In comparison to mine, yours seems to be in a higher gear, with better acceleration, however it doesn't seem to stop as well, maybe mine has a higher gear loading which slows the car better.
I re-tested with the extra downforce:
Yours - 3'19.296 (2.3 quicker than before)
Great car overall, stops better, quicker in the chicanes due to ballast on mine, and is better on the straights, but I'm still quicker theough the Porsche curves, but as a sector time it is negated due to the ford chicanes, which is where the ballast really hurts my times.
-1.825 to my time.

Mine - 3'21.121
Mostly due to ballast, however the extra front downforce helps through the faster corners, but there aren't very many of them.

Also with braking, it appears your car is much more stable under brakes, and less prone to the bumps, as during the corner before indianapolis, when on the limit, my car reacts poorly and tries to fly off the road, your car just glides over it with ease.
The lack of downforce is really hurting the car, I can't attack the track with as much confidence as in my car, and to top it off, your car and setup only achieves (LESS THAN) 191 A-spec points against the same lineup as my 200 A-spec effrot.
So, the car is better for the section where downforce isn't crucial, up 1.1 seconds to mulsanne corner, from there it falls away, to be (on combined best) 8 tenths down.
StigsTC
I don't know what it is, but suddenly the car is unstable under braking, and is liable to spin with the slightest bit of steering or movement, I dunno what it is, but suddenly I'm pointing backwards when I'm trying to go fast...
My full schedule B-spec guide and setups to the FGT (GT4)

100% all gold in GT4, GT5 and GT6. At last.

PSN:
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Last on: 10/16/2016
Setups: 267
Posts: 1460
Posted 05/23/2010 7:46 PM Post a reply Quote this post View Fumes's info
StigsTibecuadorianco wrote:
I used Auto set 17, it could be 18, not sure...
Actually, I think it needs to be AT LEAST 18
In comparison to mine, yours seems to be in a higher gear, with better acceleration, however it doesn't seem to stop as well, maybe mine has a higher gear loading which slows the car better.
Yours - 3'23.445
Great lap until Mulsanne corner, lost 1.7 to my best lap there after, but still was faster. SO it could be seen as a 3'21.7

Mine - 3'20.984
Mostly due to the downforce.



No, no. Don't use my gear ratios yet. I have not added it in the setup above.
I have forgotten the values.
I hope you haven't been using the gear ratios above. Eek

StigsTibecuadorianco wrote:

Also with braking, it appears your car is much more stable under brakes, and less prone to the bumps, as during the corner before indianapolis, when on the limit, my car reacts poorly and tries to fly off the road, your car just glides over it with ease.
The lack of downforce is really hurting the car, I can't attack the track with as much confidence as in my car, and to top it off, your car and setup only achieves 191 A-spec points against the same lineup as my 200 A-spec effrot.
So, the car is better for the section where downforce isn't crucial, up 1.1 seconds to mulsanne corner, from there it falls away, to be (on combined best) 8 tenths down.
StigsTC
I don't know what it is, but suddenly the car is unstable under braking, and is liable to spin with the slightest bit of steering or movement, I dunno what it is, but suddenly I'm pointing backwards when I'm trying to go fast...


I tuned the car specifically to remove that unstable behavior in braking, so good to see that you noticed.

I don't use ballast that might be why it's lower on A-Spec points ??
Try again with correct gear ratios. At least 18. The tenths you loose due to the lack of downforce, you gain in top speed.

PSN: StigsTC
Joined: 01/20/2009
Last on: 08/29/2016
Setups: 67
Posts: 1192
Posted 05/23/2010 8:15 PM Post a reply Quote this post View StigsTibecuadorianco's info
The gears ratios above weren't used, ( i think you only had the 6th gear), I just used the auto sets.
What did you do to get rid of that braking issue? is it in the spring ratios, by lowering the difference bewteen them?
Now with the A-spec
The fact that you have less downforce should compensate for the ballast, but considering I'm running 44/49 and you are running 30/50 its not actually that big of a gap, but the fact is I'm getting better fron grip for effectively less drag, as (accordingto how the universe works in my head) the front downforce doesn't effect the top speed as much as the rear downforce, as there is more drag associated to rear downforce (on non-F1 cars...)
The added advantage of cornering ability is that through the porsche curves, you aren't being harassed by the AI in LMP's, you actually escape, and for once, top speed isn't the way the race is won. I've found the top speed gains negligible, however acceleration gains are quite benifitial.
Once I work out the braking issues, I'll conduct a re-test and see what happens...
StigsTC
My full schedule B-spec guide and setups to the FGT (GT4)

100% all gold in GT4, GT5 and GT6. At last.

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Last on: 10/16/2016
Setups: 267
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Posted 05/23/2010 9:01 PM Post a reply Quote this post View Fumes's info
StigsTibecuadorianco wrote:
The gears ratios above weren't used, ( i think you only had the 6th gear), I just used the auto sets.
What did you do to get rid of that braking issue? is it in the spring ratios, by lowering the difference bewteen them?


StigsTC,
You're right with the front downforce.
I have made a change to my setup after our discussions.
Moved front to 40 for now. More fine tuning needed.

As for brake improvement ... look at my shocks bound/rebound and LSD deceleration.
If you need me to explain why they are set like that, give me a shout.

PSN: MontalvoMC
Joined: 01/23/2010
Last on: 05/03/2012
Setups: 6
Posts: 152
Posted 05/24/2010 10:56 PM Post a reply Quote this post View adeadsnipermatt's info
Quick question i know this sounds a little dumb but why are the spring rates to high? Is it to compensate for the low ride high? Also do you need them high to resist the downforce at high speeds? Or do you just need a bone stiff ride to keep the car stable? I really like the set up but I'm curious to why your springs are so stiff for such a bumpy track.

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Last on: 10/16/2016
Setups: 267
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Posted 05/24/2010 11:03 PM Post a reply Quote this post View Fumes's info
adeadsnipermatt wrote:
Quick question i know this sounds a little dumb but why are the spring rates to high? Is it to compensate for the low ride high? Also do you need them high to resist the downforce at high speeds? Or do you just need a bone stiff ride to keep the car stable? I really like the set up but I'm curious to why your springs are so stiff for such a bumpy track.


I wouldn't normally have spring rates this high for a bumpy track like Sarthe.
But for some reason, this car would dip too much under strong braking, causing the rear to lift, and thus loose control during high speed braking.
I have not found a softer ride that would fight that huge dip during braking.
More testing is required to find a softer spring rate.

PSN: MontalvoMC
Joined: 01/23/2010
Last on: 05/03/2012
Setups: 6
Posts: 152
Posted 05/27/2010 6:57 AM Post a reply Quote this post View adeadsnipermatt's info
Have you tried messing with the weight balance? It works even if you don't add more weight to the car.

PSN:
Joined: 11/22/2001
Last on: 10/16/2016
Setups: 267
Posts: 1460
Posted 05/27/2010 7:57 PM Post a reply Quote this post View Fumes's info
adeadsnipermatt wrote:
Have you tried messing with the weight balance? It works even if you don't add more weight to the car.


Sure it's not a placebo effect?
I'll give it a go. I'm still not 100% convinced that this works.
Not without some solid proof, like the GT4 programmers confirming the code is there for this to work. Big Grin

PSN: StigsTC
Joined: 01/20/2009
Last on: 08/29/2016
Setups: 67
Posts: 1192
Posted 05/27/2010 8:09 PM Post a reply Quote this post View StigsTibecuadorianco's info
Regardless if the 0 ballast works for you Fumes, maybe it'll help me with my 80Kg of ballast... Should I shift it backwarks, or just compensate with strong spprings and shocks?
My full schedule B-spec guide and setups to the FGT (GT4)

100% all gold in GT4, GT5 and GT6. At last.

PSN:
Joined: 11/22/2001
Last on: 10/16/2016
Setups: 267
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Posted 05/27/2010 8:14 PM Post a reply Quote this post View Fumes's info
I'll need to try it before I can suggest anymore.
But Shift it backwards. But if you start oversteering too much, shift it forward a little until you are satisfied with the car's control.

PSN: StigsTC
Joined: 01/20/2009
Last on: 08/29/2016
Setups: 67
Posts: 1192
Posted 05/28/2010 7:06 AM Post a reply Quote this post View StigsTibecuadorianco's info
I re-tested your setup with the extra downforce, against my car setup for the race;
Its back on my comparision post above, however your car made 2.3, and was just much better overall, the ballast is what killed me, but I was within 2 seconds, I'm happy with that.
(over the race distance (400 laps) - I'd lose about 13 laps - kinda crazy actually.)
Anyway, yet again Fumes, you've out-done me, but I have to figure out what to do with that braking issue - it goes away when you drive it straight on entry and with a bit of room for error.
My full schedule B-spec guide and setups to the FGT (GT4)

100% all gold in GT4, GT5 and GT6. At last.

PSN:
Joined: 11/22/2001
Last on: 10/16/2016
Setups: 267
Posts: 1460
Braking issues
Posted 05/30/2010 8:49 PM Post a reply Quote this post View Fumes's info
As you can see from our discussions, particular attention was put into that braking issue.
So, yes, it's an issue of this car.
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