Nissan Skyline
Nissan Skyline


*R32 GTS-T
*R33 GTS25-T
*R34 GT-T
*R32 GTR
*R33 GTR
*R34 GTR
*R34 Z-Tune
*V35 GT350

Tuning Guides
*R32 GTS-T
*R33 GTS25-T
*R34 GT-T


*Project GTS25-T

Tech Resources
*Airflow meters

*Project GTS25T




Home > Skyline GTS25-T Tuning > Skyline GTS25- T Tuning Part 2

Nissan Skyline
Nissan Skyline
Nissan Skyline
Nissan Skyline

R33 GTS25T

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 turboís 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 Nissan Skyline 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to make around 300rwkw the GTRS is cheaper and a little more responsive than the PRO-S. Another popular choice since superseded by newer models was the 2535 which is similar to the GT-RS.

Fuel system
If you havenít 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 donít require any modifications s to fit. The JDM spec S15 Silvia injectors are also a popular choice as they flow more and fit without modification.

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

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 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. takes no responsiblity for any problems you may encounter from following this guide.


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