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Skyline GTS-T Tuning
Part 2
Nissan
Skyline R32 GTST
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 RB20 is no exception with regular maintenance and a
safe tune 240rwkw is easily possible. Some people push the limits with
250rwkw+ but if you want an engine that will last 240rwkw is a safer
limit.
Turbo
Selection
There are many good turbo options available for the RB20 and for a street
car I recommend a responsive turbo not a lag monster. A turbo that will
bolt onto standard manifold will save time and money in the long run.
A popular
and cheap turbo upgrade for the RB20DET is a standard turbo off the
R33 GTS25T or the R34 GTT as they are a direct fit and 200+RWKW is possible.
Boost should be limited to 14psi due to the ceramic wheel. Many people
in Australia have had there standard 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 220rwkw or up to 235rwkw with
cams.
Another
popular Turbo upgrade for the RB20 is the HKS 2530 this turbo also bolts
onto the standard manifold and can make arround 230rwkw with supporting
mods.
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. GTR injectors are a popular upgrade for the RB20 as they
are cheap compared to new and are a direct fit. But if you are still
using the stock ECU you will need a resistor pack as GTR injectors run
on high impedance. Rx7 S5 460cc injectors are ALMOST a direct fit, they
fit into the rail but are slightly shorter so the height or the rail
needs to be cut down otherwise the injectors will leak...these are the
same voltage (Low impedance) as stock and don't require resistor pack
but keep in mind they only spray in a jet stream and not a spread as
they are designed for a rotory engine.
When buying second hand injectors its a good idea to
get them cleaned and flow tested, which normally costs $50 an injector.
New injectors will cost you about twice as much as the options above;
popular choices include Nismo and HKS. If you cannot afford new ones
or don’t want to use second hand injectors it is possible to get you
standard injectors high-flowed.
Airflow meter
The RB20DET air flow meter runs out of voltage after around 200rwkw's,
most tuners will be able to tune the car past the limits of the AFM
but it is a better idea to ugrade you AFM. This allows for finer tuning
which will result in a 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. An aftermarket ECU with Map sensors can be
used insteed of an AFM but engines equipt with air-flow meters are more
tunable. click for more information
a about airflow meters
ECU tune
Your RB20 ECU can be tuned be many performance workshops you can either
have this done or buy an aftermarket ECU like the Power FC.
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 Nissan 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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