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Saturday, April 25, 2015

Can I Run Different Sized Tires on My Nissan Skyline GT-R? NISMO R32 GT-R with R34 GT-R Wheels. 18 x 9 +30  245/40/18 Toyo R888

Can I Run Different Sized Tires on My Nissan Skyline GT-R?

A: A Nissan Skyline GT-R came with the same sized wheel and tire front to rear.

  Stock wheels and tire sizes
R32                 16 x 8 +30  205/50/16
R32 Vspec      17 x 8 +30 225/50/17
R32 Vspec II  17 x 8 +30 245/45/17

R33  17 x 9 +30  245/45/17

R34   18 x9 +30 245/40/18

The ATTESA, or all wheel drive system in a GT-R, uses inputs from the throttle, from the G-sensor, and from the ABS/wheel speed sensors to lock up the center differential.  If the wheel heights are different, they rotate at different speeds. The ATTESA/ABS ECU sees this as slippage. This causes lockup of the center diff. That constant lockup can lead to heat, slippage, and burning out the transfer case clutch pack.

ATTESA System overview technical document

So, can you do it?  The answer I like to give people is - NO.  The reason is because I don't want them to do something wrong, and screw up their transfer case or ATTESA system, and blame it on me.

The real answer is, if the overall heights/diameters are similar enough, you can get away with different sized front and rear wheels, tires, etc.

There are no specs in the R32 Service manual, but the R35 service manual says

Diameter difference front/rear
0-4 mm STOCK
4-8 mm OK
8mm- and greater NO GOOD

I have seen worn tires throw an ATTESA code. You could get a code running tire pressures way wacky ie 40 psi in 3 tires, and 20 psi in one.

Most often people try and do some kind of staggered setup, don't do the calculations before they purchase tires, and now end up with a 2wd Nissan Skyline GT-R.  Which may sound like fun, until you want/need the all wheel drive.   So always check the diameters, make sure before you buy anything.  The safe way is stay square. Lets you rotate the wheels and tires around the car. Great for real cars that run on the race track, and even street car guys that run some miles.

Tire Rack Calculating tire dimensions

If you are looking for R35 Nissan GT-R information on the same subject - check out - Nissan GT-R Wheel and Tire Fitment at

R32/R33 transfer case

Transfer case internals. Clutch pack, front drive, and chain
R32 ATTESA Codes
R34 ATTESA Codes

Buy USA Legal R32 Skylines at! for Nissan Skyline GT-R and GT-R parts.

NISMO option wheels. 16 x 8 +30. 255/50/16 Mickey Thompson ET Street Radials

World Challenge Nissan Skyline GT-R Pictures from 2005-2006 R34 GT-R headed up Pine Avenue in Long Beach
Check out some pictures of the Automotive Forums R34 GT-R from 2005 to 2006. This car ran in World Challenge GT for part of the 2006 season.

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Sunday, March 22, 2015

GTR WORLD RECORD 7.327 @ 191.95mph RIPS MGAWOT III In Car Video

In car video of the Nissan Skyline GT-R all wheel drive world record run.

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Do Luck Ignition Strengthening Harness Kit for R32 Nissan Skyline GT-R

Do Luck Direct Ignition Strengthening Kit. 
The Nissan Skyline GT-R ignition coil harness lives in the valley of the engine. The RB26 is a coil on plug engine, and in the R32 and R33 in addition to the coils there is a ignitor box. On the R34 they eliminate the separate ignitor box, and build the ignitors into the coils. The coil harness is one of a few unique, not shared parts on the R32, R33, and R34 GT-R RB26DETT.

The problem is that the coils, and the coil harness gets hot. It gets cooked.  If I am racing, I pull the center cover off. Leave the coils open as below.

The engine doesn't look as finished, but when you are racing, much better to try and keep from cooking the coils and harness. Often when you are taking an old coil harness off, its crispy, and the connectors break in your hand.

Resistance increases with temperature. Electricity takes the path of least resistance, and excessive heat often can cause misfires.  Check out this post I did a while back, when I found out about the Do Luck Direct Ignition Harness Strengthening Kit.  Not only does Do Luck have an upgraded coil harness, they have a direct wire option.  The direct wire option adds a relay, and pulls 12 volt power directly from the battery.

Do Luck Direct Ignition Strengthening Kit relay mounted in an R32 GT-R.

The install is straight forward. Remove the old coil harness. Install the relay for direct power from the battery. Plug in the new harness.  If you don't know when the last time your ignition system was maintained, then this is a good idea.  Buy one here in the US at this link.  While you are in there, put a good set of spark plugs, and do the coil pack fix as detailed here.   RB26DETT Ignition System troubleshooting. 

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