Nissan RB25 tuning guide
Guide on how to tune the RB25 engine
In this guide, we try to help you on your way with tuning your RB25 engine. The engine is easy to get extra hp. out of - Without the big money wallet has to come out of the pocket. Note that cars equipped with Tiptronic gearbox must be made in a different way as the gearbox cannot handle the extra power.
This is how we can best help you in support!:
Many people want to know if they have all the parts they need to put a new turbo on their car. If in doubt, you can do the following:
- Create a login on the website - Then you are set up as a customer.
- You put all the goods you expect to use - or are in doubt about - in the shopping basket.
- Email me - I can see the parts you have in the cart and add parts if you are missing something.
The right approach to tuning
Before you start, it's a really good idea to know how many hp you want. you want. As you or may end up buying parts that are not relevant to your upgrade. A good place to start is at 300, 350 and 450 hp. - It is 3 steps with easy upgrade options. Anything over 500 hp. requires a major rebuild and other parts.
RB25DE - NON-TURBO twin-cam 180 - 200 hp @ 6000 rpm
RB25DET - twin-cam TURBO (T3 Turbo) 245-250 hp
The NEO cylinder head fitted from 1998 gave better emmension, it also has mechanical lifters and a different camshaft profile.
RB25DE NEO- NON-TURBO twin-cam 219 hp @ 6000 rpm RB25DET NEO - twin-cam TURBO 276 hp @ 6400 rpm
Standard boost pressure is 0.5 bar up to 4500 rpm. From here 0.7 to 7000 rpm. This provides better fuel economy. The first thing you often want to do is to make it run with 0.7 bar boost pressure from the very bottom. You do this by attaching the black wire to the charge pressure valve to the frame. If you want a little more boost pressure, you can fit a boost controller, manual or electronic. Here you can safely drive with 0.85 bar boost pressure. Here, 3" downpipe without catalyst, large front mounted intercooler, high flow air filter, Z32 MAF and a pair of new spark plugs will provide safety and extra power.
The cylinder head on an R33 (not the turbo model) is slightly different, here there is no water and oil connection to the turbocharger.
Weak points and problems with the RB25 engine
If you drive with more than 0.9 bar boost pressure, the standard ceramic turbochargers will break prematurely.
Oil cooling may be necessary as the engine may otherwise overheat.
Oil shortage in high speed cornering. Here the engine may lack oil as the oil is forced to the side, here it may be an idea to pour approx. ½ liter extra oil on the engine.
300+ requires a new engine management
320-340 hp. the turbocharger, head gasket (1.2 bar charge pressure), clutch, air mass meter and nozzles must be upgraded.
340+ Will an aluminum cooler be really good if you push the car extra hard
500+ Forged pistons, H-profile connecting rods, reinforced head gasket, ARP bolts, cylinder head porting.
Bolt on turbocharger with plenty of power
If you want an easy, fast and efficient upgrade, you can choose to install 2 new and larger turbochargers. You can do this and get min. 550 hp. out of it. The turbochargers are cheap but at the same time really good. It is still recommended to fit a larger exhaust, intake, etc., etc.
Bolt on turbo RB25 - Turbo for direct mounting on original system.
Turbo mounting - Single turbocharger
When you have control of your engine's internal structure or do not want to exceed the above in the first place, it is time to install a larger turbocharger. Below we have a good setup for the parts to be used on the exhaust side. You should expect spoolup to be around 4000 rpm with a T70 turbocharger. If we do not have the parts in stock, you're welcome to contact us, and we will find a solution.
RB20DET / RB25DET turbo manifold - Manifold in very high quality and good thickness.
38mm. Wastegate - Wastegate for direct mounting on the turbo manifold - Choose from several models with bolt flange.
T70 turbo - Cheap turbocharger for around 600 hp.
T70 Anti-surge turbo - Turbocharger with T3 flange for around 550-650 hp.
Oil hose kit - Oil hoses for inlet and return to turbo - Easy installation.
Water connection for turbocharger - Good cooling of the turbo is important for long durability.
Downpipe - Specially made downpipe for our turbo kit.
Complete turbo kit for 700hp. - Really good starting point for lots of effect.
Intake manifold - High flow intake manifold
With a new intake manifold, you not only get a nice engine compartment - also more power. Most of our manifolds are made with funnels inside the manifold which increases the flow extra. Everything you need for installation is included, such as radiator hoses, gas damper and new nozzle bridge. It is recommended to drive with 668cc. nozzles for about 550 hp. and 875cc. nozzles if you are going for around 750hp. With the new intake, nozzles with 13.5 mm must be installed. o-rings - Standard Bosch measurements and the nozzles we link to.
RB25 / RB25DET intake - Quality manifold with very high flow
K&N Air filter - With the installation of a larger turbo, more air must enter through the air filter
668cc. nozzles - Nozzles with up to approx. 550-600 hp. - Depending on the mixing ratio
875cc. nozzles - Nozzles with up to approx. 750-800 hp. Everything has a mixing ratio
EV1 connector - Connector for mounting overhead nozzles, the connectors are very easily changed if you have pliers that can squeeze the connector legs.
Cooling - aluminum radiator and large intercooler is important
Extra good cooling of the engine is really important when you are tuning your car - especially if you push the car a lot. We have, for example, aluminum coolers which are for direct installation and which provide incredibly good cooling. A large intercooler is also very important when extra charge pressure and flow must pass through the system.
Aluminum cooler & cooling system - Really good aluminum coolers that cool extra well under heavy load.
Intercooler kit - We have a super good intercooler kit for Nissan - even at the right price
Universal intercooler - Intercooler for the do-it-yourselfer or if we have to build a special system for you
Aluminum pipes - Save on weight and price when buying aluminum pipes
Silicone hoses - Really good universal silicone hoses for mounting a new pipe system
Stainless steel clamps - Clamps for mounting hoses in small and large sizes
Sports Exhaust - Large exhaust system is a MUST
You can get many plug and play exhaust systems for many car brands. But maybe you are building an engine that has a few more horsepower than what a PNP exhaust system can handle. Here we can help with specially built exhaust or parts for you to build yourself. We recommend 3" up to 500-600hp and 3.5" above that.
Exhaust - Here you will find everything you need to build a high performance exhaust
Specially built - We specially make exhausts for cars - In the highest quality
Petrol system - New petrol pump
Often, an original petrol system cannot keep up when a turbo is installed, where both more air and petrol must enter the engine. Here you can often simply fit a new pump if it is up to around 500-700 hp. However, it is recommended that you get over 500hp. you must check the entire system for "plugs" - This could be, for example, the fuel filter, nozzle bridge, fuel hoses and connections (plugs). We have everything you need to upgrade your petrol system - E.g. there are many who install a surge tank, where there are either 1 or 2 petrol pumps in - This gives the possibility of up to 2000 hp. without boost pressure and 1600 hp. with charge pressure. Here, for example, AEM 1000 hp must be used. petrol pumps and surge tank with 2 internal petrol pumps.
Upgrade Fuel Pumps - Fuel pumps for internal mounting and external mounting
Surge tank - Unique option for upgrades to the petrol system without having to replace the original tank.
AN fittings - All in AN fittings for fitting petrol pumps, filters, hoses etc etc.
Fuel system - Here you will find everything you need for building fuel systems and upgrading
Engine management - Plug and play for Nissan RB25
With a plug and play system from ECU Master, you are very fast and drive well. When you order a plug and play system, you get a startup file with it - This makes starting up the new motor control really easy. ECU master can clearly be recommended as a quality product at a super sharp price. The PNP kit is available as you see below with assembled plug and wires - Ready for installation.
ECU Master engine control - The box itself is fully programmable
Plug and Play RB25 box - The box that is mounted on the original wiring harness / plug
Engine Parts - Upgrading the engine
As you can read in this guide (top), the engine needs an upgrade of engine parts if it is to be able to handle power over 500hp. And you achieve that very quickly with such an engine. We deal with the vast majority of well-known brands such as Je, Wiseco, ACL, K1, Athene, Cometic, ARP, etc., etc. So you can quickly and easily upgrade the engine. If you do not find the parts you need, you are very welcome to write to us.
Engine Parts - Everything in engine parts for upgrading
Forged pistons - Quality from JE and Wiseco
H-profile connecting rods - Strong connecting rods are required - H-profile is used for turbo engines.
Head gasket - Steel head gasket or cutting ring head gasket are both an option (Super both).
Adjustable cam wheels - Often a necessity when the top or block has been leveled and a new camshaft has been fitted.
ARP bolts - Often used both for the cylinder head, connecting rods and sub-engine.
ACL bearings - Expansion bearings that are made of hard material.
Engine kit - Set for several engine models, if you can't find one for your model, we'll help assemble a kit.
