I did several hours with the GT-R (R-35) service manual this past weekend. I'm no stranger to Nissans and heavy duty performance modification.
The R-35 is one of the most electronically complex cars I've ever seen. The tranny alone with it's dedicated computer (TCM) is a real brain bender.
Just disconnecting/reconnecting the battery requires about three Consult III system resets. Unlike previous Nissans, there is no non-Consult Nissan voodoo alternative.
Some systems are standard Nissan systems and a number of items are pure 350Z (e.g., ETC).
The warning I'll give is modifications with wiring harness taps -- be extremely careful because an incorrect tap could easily make your GT-R dead. Many systems use variable voltage, so tapping a variable voltage line can really muck up the works. Do not ground to a dedicated system ground -- use a common vehicle ground.
By the way, the turbo boost levels are adjusted to ambient atmospheric pressure -- one of the ECM boost controller inputs is from the EVAP ambient pressure.
I recommend before you do any modification fully understand the system(s) you're modifying and then do it in a very educated way with lots of research. This car isn't like modifying any other car.
Will I modify my GT-R? Probably, but it will only be after very methodical and careful research into the modification. You can bet I'll have hours of performance data logging before I turn one bolt.
Think of working on the GT-R as if you're working on the space shuttle -- it's almost that complex. Many systems are inter-related, so changing one system could end up affecting other systems.
Trivia: How many air filters on a GT-R? Four; two primary and two secondary (on the air pumps -- yes, air pumps, not turbos). Judging from looking at the the system in the manual, it looks like maybe pre-boost to make turbo lag zero. The manual isn't entirely clear on the system's purpose. I'll know more once I get my hands on the car and see the system itself.
The tranny has several failsafe or "limp modes" for a number of tranny DCTs. If anyone thinks the 350Z is a pain with all its "limp modes," wait until you get a load of the GT-R. I think if it hears you cursing it, it will go into "limp" -- not quite that bad, but almost.
and the current Z Car inventory
2007 San Marino Blue 350Z Touring Roadster - WHIZZY
2003 Blown Brickyard Performance 350Z (Approx. SGP Stage XI) - FLYIN Z
1991 White 300ZX Twin Turbo (SGP Stage V+) - Z FLYBY
Black/black GT-R on order
Last edited by Tere; 07-14-2008 at 10:02 PM..