Standard Suspension - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Harry · 3rd November 2002, 10:43 PM

Can anyone tell me what the spring rate is for the suspension on an R33 V-Spec? Wanting to benchmark against upgraded kit.

Thanks

Mycroft · 4th November 2002, 12:43 AM

Interested also, as I can then make a mathematical model of the whole thing and play around with my nice 3d suspension program again.

DCD · 4th November 2002, 02:10 AM

4.0kg/mm front & 5.0 kg/mm rear

Harry · 4th November 2002, 09:32 AM

DCD - perfect, thanks

Mycroft - what outputs will your software give you?

Mycroft · 4th November 2002, 10:00 AM

Base resonance, load point readings, stresses, quite a bit really.

Are your springs not progressively rated?

DCD · 4th November 2002, 10:02 AM

Mycroft....do you need any info on the damper specs?

Mycroft · 4th November 2002, 10:14 AM

Any info helps, but I tend to use 'baseline figures' then play around a bit.

Mycroft · 4th November 2002, 10:22 AM

My quick play around gives me 70lb/in to 105lb/in for the front, 55lb/in to 95lb/in for the rear, this is using standard(ish) shockers but with differing bounce and rebound rate there isn't a huge variation, the sprung/unsprung balance does though, by quite a large amount.

More info please.

Mycroft · 4th November 2002, 10:29 AM

1kg/mm equals (approx) 11.5lb/in.

DCD · 4th November 2002, 10:43 AM

Dampers: (kg•0.3m/s)

Front: Bump 275, Rebound 85
Rear: Bump 175, Rebound 67

Stabilizer: (ø)

Front: ø 22.2mm
Rear: ø 26.5mm

What about alignment? Would that be of any use?

Mycroft · 4th November 2002, 10:57 AM

I have the 'stick diagram that Nismo use for their computations so I'll play around with that for a while but, the normal running angles would be nice, sorry to keep asking for more stuff but more info=better (more consistent) results.

Mycroft · 4th November 2002, 11:02 AM

I must say that at present using dual rates appear to give better resonances overall, I especially like the fact that at 3/4 stroke (hard cornering) the frequency of the loaded assembly stays at 2.6cps at the front, that is very stable, the single rate gives 3.8cps, at the front lower frequency=better handling.

DCD · 4th November 2002, 12:05 PM

OK, here it is:

-Front-

Camber: -0º50' (+/-45')
Caster: 3º55' (+/-45')
Toe in: in 2~0 mm
King pin: 15º20' (+/-45') ««-- No idea what this is

-Rear-

Camber: -1º15' (+/-30')
Toe in: 0~in5.2 mm

Mycroft · 4th November 2002, 03:13 PM

I have assumed that you have Nolothane P5 grade (NP5) bushes (they are standard on the bigger Nissans and Toyotas.

If you have Polypropylene type (PP3) the characteristics will be slightly inferior all round, the large number of links in the design means that Kinematics becomes a serious issue and are better controlled by Nolothane due to its better inherent 'Tension Reparte' and Hysteresis.

Mycroft · 6th November 2002, 10:28 PM

Harry, how you doin'?

Where ya' goin with this?

Are you certain that the springs ARE the issue not the Bushes!

As a general rule, upgrading the Bushes does more good than upgrading springs with standard bushes, go to Nolothane 'Red' (very hard)or even blue (hard) would be a definite improvement.

3rd November 2002, 10:43 PM	#1 (permalink)
Harry GTROC Member Join Date: Sep 2002 Location: Surrey Posts: 1,132	Standard Suspension Can anyone tell me what the spring rate is for the suspension on an R33 V-Spec? Wanting to benchmark against upgraded kit. Thanks

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4th November 2002, 12:43 AM	#2 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	Interested also, as I can then make a mathematical model of the whole thing and play around with my nice 3d suspension program again.

4th November 2002, 02:10 AM	#3 (permalink)
DCD GTR Register Member Join Date: Jun 2001 Location: Tokyo Posts: 9,336	4.0kg/mm front & 5.0 kg/mm rear

4th November 2002, 09:32 AM	#4 (permalink)
Harry GTROC Member Join Date: Sep 2002 Location: Surrey Posts: 1,132	DCD - perfect, thanks Mycroft - what outputs will your software give you?

4th November 2002, 10:00 AM	#5 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	Base resonance, load point readings, stresses, quite a bit really. Are your springs not progressively rated?

4th November 2002, 10:02 AM	#6 (permalink)
DCD GTR Register Member Join Date: Jun 2001 Location: Tokyo Posts: 9,336	Mycroft....do you need any info on the damper specs?

4th November 2002, 10:14 AM	#7 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	Any info helps, but I tend to use 'baseline figures' then play around a bit.

4th November 2002, 10:22 AM	#8 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	My quick play around gives me 70lb/in to 105lb/in for the front, 55lb/in to 95lb/in for the rear, this is using standard(ish) shockers but with differing bounce and rebound rate there isn't a huge variation, the sprung/unsprung balance does though, by quite a large amount. More info please.

4th November 2002, 10:29 AM	#9 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	1kg/mm equals (approx) 11.5lb/in.

4th November 2002, 10:43 AM	#10 (permalink)
DCD GTR Register Member Join Date: Jun 2001 Location: Tokyo Posts: 9,336	Dampers: (kg•0.3m/s) Front: Bump 275, Rebound 85 Rear: Bump 175, Rebound 67 Stabilizer: (ø) Front: ø 22.2mm Rear: ø 26.5mm What about alignment? Would that be of any use?

4th November 2002, 10:57 AM	#11 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	I have the 'stick diagram that Nismo use for their computations so I'll play around with that for a while but, the normal running angles would be nice, sorry to keep asking for more stuff but more info=better (more consistent) results.

4th November 2002, 11:02 AM	#12 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	I must say that at present using dual rates appear to give better resonances overall, I especially like the fact that at 3/4 stroke (hard cornering) the frequency of the loaded assembly stays at 2.6cps at the front, that is very stable, the single rate gives 3.8cps, at the front lower frequency=better handling.

4th November 2002, 12:05 PM	#13 (permalink)
DCD GTR Register Member Join Date: Jun 2001 Location: Tokyo Posts: 9,336	OK, here it is: -Front- Camber: -0º50' (+/-45') Caster: 3º55' (+/-45') Toe in: in 2~0 mm King pin: 15º20' (+/-45') ««-- No idea what this is -Rear- Camber: -1º15' (+/-30') Toe in: 0~in5.2 mm

4th November 2002, 03:13 PM	#14 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	I have assumed that you have Nolothane P5 grade (NP5) bushes (they are standard on the bigger Nissans and Toyotas. If you have Polypropylene type (PP3) the characteristics will be slightly inferior all round, the large number of links in the design means that Kinematics becomes a serious issue and are better controlled by Nolothane due to its better inherent 'Tension Reparte' and Hysteresis.

6th November 2002, 10:28 PM	#15 (permalink)
Mycroft Banned Join Date: Apr 2002 Location: Up someones nose, apparently Posts: 3,561	Harry, how you doin'? Where ya' goin with this? Are you certain that the springs ARE the issue not the Bushes! As a general rule, upgrading the Bushes does more good than upgrading springs with standard bushes, go to Nolothane 'Red' (very hard)or even blue (hard) would be a definite improvement.