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Saturday, June 16, 2018

Nissan Skyline GT-R ATTESA All Wheel Drive System Transfercase

The R32 and R33 Transmission and transfercase are very similar.  The R34 transfercase while looking and functioning similar is actually a little weaker than the R32/R33 transfercase.

So at one time, after looking and thinking about the GR6 in the R35, and being underneath my Infiniti FX45, I decided that putting a newer transfer case on an R32/R33/R34 might be possible.  I bought a used FX transfer case. I had R32/R33, R34, and RB25 Auto all wheel drive transfercases as we do when we work on these cars for nearly 20 years.

The reason for trying it was pretty simple. Eliminate the electrical to hydraulic to mechanical that is the ATTESA system in the R32/R33?R34.  By using the direct control of a solenoid you could speed the reaction time of the system up significantly.  However once I got the transfers apart, there were a few challenges that I didn't feel like tackling at that time. 

I haven't revisited this again, but it is something I would like to revisit.   I have some ideas on how to make it work, and help modernize the ATTESA system.

More write up coming ...

Mechanical speedometer drive. You can tell this trans came from an R32 GT-R

Clutch pack assembly and chain

When I was growing transfercases in my garage. 

Friday, June 15, 2018

18 x 10.5 +22 Wheels with Staggered Tires on a Nissan Skyline GT-R

18 x 10.5 +22 front and rear. 275/35/18 front and 295/30/18 rear tire

This would be a non standard setup for a Nissan Skyline GT-R. We generally don't like to see a staggered tire setup on an all wheel drive car.  This car is running a 18x 10.5 +22 wheel front and rear. The front and rear fenders are rolled. The car runs an adjustable upper control arm in the front and in the rear.  In the rear there is a lot of room, in the front not much room to the upright. Even some telltales of it making contact. 275/35/18 in the front, and a 295/30/18 in the back. The front tires/wheels already stick out further than we would like in the front, sorry we don't do the "poke." Terrible for aerodynamics, a look for kids and their Hondas. Adults try and keep the wheel and tire within the bodylines.

The smart thing for us to do on this car is to square it up with a 265/35 or a 275/35 tire. The 15 mm in diameter difference is more than we want to see with an all wheel drive car.

Diameter inches (mm)25.58 (649.7)24.97 (634.2)-0.61 (-15.5) -2.4%
Width inches (mm)10.83 (275)11.61 (295)0.79 (20) 7.3%
Circum. inches (mm)80.36 (2041.09)78.44 (1992.4)-1.92 (-48.69) -2.4%
Sidewall Height inches (mm)3.79 (96.25)3.48 (88.5)-0.31 (-7.75) -8.1%
Revolutions per mile (km)788.47 (489.93)807.74 (501.91)19.27 (11.97) 2.4%

What wheels fit on my R32 Skyline GT-R?

Can I run different sized tires on my Nissan Skyline GT-R? 

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.
Front 25.58 inches (649.7 mm tall) 10.83 inches (275 mm) wide

Rear 24.97 inches (634.2 mm) tall. 11.61 inches (295mm) wide

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18 x 10.5+22

Tire clearance to front upright. This tire shows a lot of toe wear. 

Tire clearance to front upright. 275/35/18. This tire shows a lot of toe wear

Thursday, June 14, 2018

Nissan Skyline GT-R Intercoolers

No intercooler in this Nissan
The OEM intercoolers in the R32 and R33 GT-R are the same. The mounting, the size, all the same.  The R34 is a little different as the end tanks are crimped on vs welded on the R32 and R33.

R34 GT-R Race car with stock intercooler. ARC oil cooler under the intercooler. C-West front bumper
The stock intercooler on a Nissan Skyline isn't bad as far as factory parts go. They are 3 inch inlet and outlet. The OEM core is 24 inches x 10 3/4 inches x 2 1/2 inches. They are mounted in a great spot. Try and make sure they have good ducting for air through the core. Through is the key. Air is lazy takes the path of least resistance. If air can pass over, around or under the core, it will. On the R34 race car, it ran an OEM intercooler up to and beyond 580 whp.

OEM R32/R33 intercooler with the paint stripped off.  We like them black. 
There is a sweet spot for intercooler size The larger it is, the more airflow required to fill it up before air goes into the engine. The larger it is, the more likely it blocks cooling airflow to the radiator/engine. Since the intercooler is a heat sink, it needs to have the capacity to cool the heated compressed air out of the turbocharger/turbochargers. Cooler air is better. Don't go overboard.
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May be discontinued

Thi is a ARC twin entry intercooler. These are very cool pieces
If you ever get a chance to see an ARC intercooler up close, compare it to most of the rest of the intercoolers in the world. There are some very interesting features on them. The bars are wedge shape. Both increasing their surface area, and making them slightly aerodynamic.  Then on the backside, the fins extend through the core.  They are expensive, hard to find, I have three of them for my cars.

Have several sizes and styles of intercooler. They used to make one of the largest available for GT-R at 6 inches thick.

HKS have had many bolt on intercoolers available for the GT-R

From Australia. No real experience with them. A few customers with them.

Also from Australia

Cheaper is always better! Sorry, we just don't do them. They fit like crap, the welds are crap. If you don't know any better then it might be acceptable. Once you have played with properly built parts, you won't cheap out on them.

What other intercoolers are people running on their R32,R33, or R34 GT-R

Wednesday, June 13, 2018

Garage Active Carbon Fiber R32 Nissan Skyline GT-R Bodykit

Normally we aren't too into body kits. Most of the time they ruin the lines of the car. There are some that look decent, most do not. However this Garage Active widebody kit for the R32 GT-R, accentuates the factory lines.  They run a 12 inch wide wheel on their demo car up from an 8 inch wide stock, and about max of 10.5 inch wide on stock fenders.   Prices range from 1 million yen (~$9000) up to 3.5 million yen(~$35,000).

Check out the build here!
Prices and parts

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