Jump to content

Welcome to Nissan GT-R Heritage
Register now to gain access to all of our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more. If you already have an account, login here - otherwise create an account for free today!
Photo

NT01 285/315 wheel speed differential data

- - - - -

  • Please log in to reply
34 replies to this topic

#1
changster

changster

    Stage 4 Member

  • OEM Member
  • 2,267 posts
  • Joined 26-January 13
  • LocationBay Area + Taipei

I just wanted to create a new thread so it's easily searchable in the future.

 

I put on a new set of 285/35/20 315/30/20 NT01's. I bought these because R888R's weren't available to me locally yet and I had to get a set of tires immediately. 

 

I see a wheel speed differential of up to 4% faster in the rears at around 240kph. I don't think I'm losing traction at that speed so I'm assuming the differential is only due to the difference in tire size. No lights on the dash for wheel spin either.

 

Is 4% a lot?

 

 

32697633352_61bf617782_o.jpg

 


- 4.4 liter Alpha 12 built by TSM (R.I.P)
- 4.1 liter ER/ETS 6466 built myself with the help of everyone.

- 4.2 liter billet block <? big boy kit> coming.

 

13180940063_33e81c30d6_z.jpg


#2
elf_cruiser

elf_cruiser

    Stage 4 Member

  • OEM Member
  • 1,666 posts
  • Joined 13-September 13
Yikes!! Can you turn on the gauge for F/R torque distribution and try this again? Just hold a steady speed and the F torque should be near 0%. If it's trying to send power to the front when you are just cruising then I think your ETS unit will start wearing out quickly...
  • Tim likes this

2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

facebook.com/DangerousEnterprises

Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#3
changster

changster

    Stage 4 Member

  • OEM Member
  • 2,267 posts
  • Joined 26-January 13
  • LocationBay Area + Taipei

Yikes!! Can you turn on the gauge for F/R torque distribution and try this again? Just hold a steady speed and the F torque should be near 0%. If it's trying to send power to the front when you are just cruising then I think your ETS unit will start wearing out quickly...

 

Cruising, it's trying to send 6-8% to the front. Take a look.

 

 

32009933634_3db2007b47_b.jpg


- 4.4 liter Alpha 12 built by TSM (R.I.P)
- 4.1 liter ER/ETS 6466 built myself with the help of everyone.

- 4.2 liter billet block <? big boy kit> coming.

 

13180940063_33e81c30d6_z.jpg


#4
haul s

haul s

    Stage 4 Member

  • Member
  • 415 posts
  • Joined 18-October 14
  • LocationAtlanta, GA
If you aren't losing traction, why would wheel speed differential decrease once you stopped accelerating?

2014 Nissan GT-R Black Edition - haulin' ass!
sigpic71174_3.gif
---
2004 Audi B6 S4 Sedan MT6 - SOLD - OG ass hauler
Brilliant Red, Black/Silver


#5
elf_cruiser

elf_cruiser

    Stage 4 Member

  • OEM Member
  • 1,666 posts
  • Joined 13-September 13

Cruising, it's trying to send 6-8% to the front. Take a look.


32009933634_3db2007b47_b.jpg



Hmmm, my understanding is that should be 0 unless you are accelerating. Maybe some others can chime in...

2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

facebook.com/DangerousEnterprises

Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#6
Dsm_alpha

Dsm_alpha

    Stage 4 Member

  • OEM Member
  • 1,349 posts
  • Joined 03-April 13
Yes it should not be trying to put 6-8% power to front unless acccelerating hard or wheel spin

#7
shawnhayes

shawnhayes

    Stage 4 Member

  • OEM Member
  • 4,684 posts
  • Joined 11-September 13

I am a big proponent of square setups.  For this reason.

 

Shawn


  • Tim, elf_cruiser and socalaviator like this

#8
elf_cruiser

elf_cruiser

    Stage 4 Member

  • OEM Member
  • 1,666 posts
  • Joined 13-September 13
What wheels are you running Changster? What dimensions?

I've heard that the only reason the 285/315 R888 setup works is because the factory rear wheel is a bit too narrow for a 315 and it pinches the tire and increases the radius enough to match the fronts...

2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

facebook.com/DangerousEnterprises

Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#9
Tim

Tim

    FYI Gators eat the bones

  • OEM Member
  • 8,557 posts
  • Joined 06-December 12
  • LocationBlue water and White Sandy Beaches

Subscribed 


post-273-0-31146100-1438786356.jpg

#10
7racer

7racer

    Stage 4 Member

  • OEM Member
  • 6,990 posts
  • Joined 24-March 13
Anyone with a square setup that can run the same test and post the logs??

In7anity!!


#11
7racer

7racer

    Stage 4 Member

  • OEM Member
  • 6,990 posts
  • Joined 24-March 13
Or one who's diameter might be closer???

In7anity!!


#12
Chris3g

Chris3g

    Stock

  • Member
  • Pip
  • 71 posts
  • Joined 02-April 14
  • LocationNorthern NJ

i run NT05 275 instead of the 285 NT01 in the front with NT01 315 in the rear for this reason, they are about as close as possible to being the same size in a staggered setup. 

 

eMq2YwW.png


  • Tim, changster, 7racer and 1 other like this

2015 Premium Jet Black
WGP built / HKS GT1000 / ShepTrans / EcuTek 


#13
thehelix112

thehelix112

    Stage 4 Member

  • OEM Member
  • 3,785 posts
  • Joined 14-June 13
  • LocationLos Angeles, CA
How are you guys logging all this?

#14
7racer

7racer

    Stage 4 Member

  • OEM Member
  • 6,990 posts
  • Joined 24-March 13

i run NT05 275 instead of the 285 NT01 in the front with NT01 315 in the rear for this reason, they are about as close as possible to being the same size in a staggered setup. 

 

eMq2YwW.png

 

 

 

that's pretty dramatic difference.


In7anity!!


#15
choerizo

choerizo

    Stage 4 Member

  • OEM Member
  • 1,620 posts
  • Joined 12-September 13
  • LocationAustin, TX

Anyone with a square setup that can run the same test and post the logs??

 

I've got a set of 285s square NT01 in my garage that I'm waiting to swap once my 285 square PSS' get worn out some more. I can run tests back to back. These would be on 20x10 front, 20x11 rear wheels.

 

I did run 285/315 NT01 briefly and I'm convinced it led to the demise of my front diff or at least contributed to premature wear.


  • 7racer likes this

#16
7racer

7racer

    Stage 4 Member

  • OEM Member
  • 6,990 posts
  • Joined 24-March 13

I've got a set of 285s square NT01 in my garage that I'm waiting to swap once my 285 square PSS' get worn out some more. I can run tests back to back. These would be on 20x10 front, 20x11 rear wheels.

 

I did run 285/315 NT01 briefly and I'm convinced it led to the demise of my front diff or at least contributed to premature wear.

 

yep I run square now...my front diff was making some noise and binding before the first rebuild when I was staggered


In7anity!!


#17
changster

changster

    Stage 4 Member

  • OEM Member
  • 2,267 posts
  • Joined 26-January 13
  • LocationBay Area + Taipei

What wheels are you running Changster? What dimensions?

I've heard that the only reason the 285/315 R888 setup works is because the factory rear wheel is a bit too narrow for a 315 and it pinches the tire and increases the radius enough to match the fronts...


20x10 20x12.
  • elf_cruiser likes this

- 4.4 liter Alpha 12 built by TSM (R.I.P)
- 4.1 liter ER/ETS 6466 built myself with the help of everyone.

- 4.2 liter billet block <? big boy kit> coming.

 

13180940063_33e81c30d6_z.jpg


#18
changster

changster

    Stage 4 Member

  • OEM Member
  • 2,267 posts
  • Joined 26-January 13
  • LocationBay Area + Taipei

If you aren't losing traction, why would wheel speed differential decrease once you stopped accelerating?


Maybe because when I'm accelerating, the weight shifts toward the rear and presses down on the rear tire which makes the rear tire smaller?

- 4.4 liter Alpha 12 built by TSM (R.I.P)
- 4.1 liter ER/ETS 6466 built myself with the help of everyone.

- 4.2 liter billet block <? big boy kit> coming.

 

13180940063_33e81c30d6_z.jpg


#19
5ive

5ive

    Stock

  • Member
  • Pip
  • 20 posts
  • Joined 29-March 16
  • LocationGermany Hannover

I had Square Setup on Street 285/35R20 often some Wheelspin then the rear tires has worn faster and i had 2 % Difference. In germany people like 295 rear and 285 front setups for saving awd clutches.

 

greetings,

Robert


  • changster and thehelix112 like this

#20
doctorspeed1

doctorspeed1

    Stock

  • OEM Member
  • Pip
  • 48 posts
  • Joined 13-September 13
I'm running 20" 285/315 NT01 on stock BE rims (9.5"/10.5") at 30/29 psi. Wheel slip is under 1 percent, torque split ~3-4 cruising at 100 kph logging with EcuTek.

Edited by doctorspeed1, 13 February 2017 - 05:47 AM.

  • changster likes this




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users