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Skyline GT-T Tuning Part 2
Nissan
Skyline R34 GTT
Engine
Tuning Stage 2
Stage
2 of tuning is where things start to get expensive as we need to upgrade
many of the standard systems. Nissan Skyline RB engines are known for
the strength the RB25 is no exception with regular maintenance and a
safe tune 270rwkw is easily possible. Some people push the limits with
300rwkw+ but if you want an engine that will last 270rwkw is a safer
limit.
Turbo
Selection
There are many good turbo options available but I recommend a turbo
that will bolt onto standard manifold this will save time and money
in the long run. Many people in Australia have had there standard Nissan
Skyline turbo high-flowed by GCG turbo’s these turbos are popular because
they use a ball bearing cartridge, and everything bolts back into place.
Turbo response is said to be similar to stock and power figures average
around 230rwkw or up to 250rwkw with cams. Some people have used larger
exhaust housings from the R34 GTT or the old single turbo 300zx and
have achieved 270rwkw+.
HKS in
Japan have a range of turbo's for the R33 that come with all the parts
needed to bolt on. Suitable kits available from HKS at the moment include
the HKS GT-RS known to make 280rwkw and the HKS PRO-S known to make
around 300rwkw the GTRS is cheaper and a little more responsive than
the PRO-S. Another popular choice since superseded by newer models was
the 2535 which is similar to the GT-RS.
Intercooler Upgrade
The standard R34 Nissan Skyline intercooler runs out of its efficiency
range at power levels above 200rwkw and needs to be replaced by a larger
front mounted intercooler. GTR intercoolers are a popular choice but
custom piping will be needed in order for it to fit. Many aftermarket
bolt on kits are available for the GTT these days starting at around
AU$500 but as with most things you get what you pay for. Be aware a
small decrease in throttle response may be noticeable due to the extra
piping and larger core size. You may notice a small increase in power
with this mod before upgrading your turbo as airflow will increase and
the air will be denser.
Fuel
system
If you haven’t done so already the fuel pump will need to be upgraded.
Second hand GTR pumps are a popular option as are new pumps from bosch,
walbro, and tomei. The GTR and Tomei pumps are a direct fit. You may
also install a fuel pressure regulator to increase fuel pressure.
Standard injectors
will also need to be upgraded at this stage. You can either have your
standard injectors high-flowed, or buy after market ones from Nismo
or Performance company's. I recommend you use injectors that are a direct
replacement and don’t require any modifications s to fit.
Airflow meter
To improve the tunability of the engine its a good idea to upgrade your
airflow meter this allows for finer tuning which will result in smoother
power delivery and make it easier for the tuner to produce a higher peak
power output . Popular upgrade choices include the Z32 and the Q45. The
Z32 is cheaper of the 2 but the Q45 will allow more airflow. click
for more information
ECU
If you have not done so already the ECU will need to be upgraded even
with a SAFC or similar the stock ECU will not do the job. As stated
before the Power FC is a popular option due to its price, ease of installation,
and use. There are plenty of other options that are superior to the
Power FC and allow many other tuning functions like launch control,
and the ability to use a map sensor instead of the airflow meter. But
the FC is still a popular and is proven to perform.
Head Gasket
Running boost levels above 1.2 may require a new metal head gasket to
lower compression and improve reliability. Opinions differ on this subject
so I think its best to ask you tuner.
Clutch
and flywheel
The stock clutch will certainly fail quickly at this power level the
hardest part is finding a clutch that will handle the power yet not
make your car a pig to drive. Exeedy seem to be popular and reliable
choice and while you are upgrading your clutch a lightened flywheel
is well worth considering. This will help the car rev quicker but the
trade off is your car will loose momentum quicker to.
Cams
or Cam gears
At this stage the skyline will benefit from a set new cams, cam gears,
or both. The outright power will be increased but the main reason for
installing cams is for a fatter torque and power curve. Upgraded cams
can help reduce lag, improve mid and top end power. Popular choice is
tomei pon cams as they fit without modification and are proven to give
good results.
Please
use this as a guide only I recommend consulting a professonal before
carrying out any of these modifications. Nissanskyline.6te.net takes
no responsiblity for any problems you may encounter from following this
guide.
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