In order to generate the boost, the turbo spools up and the quantity of boost provided by the actuator is controlled to some degree. To prevent the turbo from spooling indefinitely if the wastegate isn't opened, the actuator signals the wastegate to open. In order to get a high boost, the stock boost soleniod fools the wastegate into opening later.
This can be detrimental to the turbocharger will be working much harder, so you will have to fine tune the settings and not run full boost all the time!! The same principle applies to the aftermarket boost controllers, which replace the stock soleniod, but you now have a facility which is allowing you to fine-tune the amount of boost you're able to achieve.
A decent aftermarket dash boost gauge is also recommended by TorqueCars, as it helps to know what's going on boost-wise. The heads were pretty much the same on the R The NASP naturally aspirated, non turbo engines don't have water and oil lines to the turbo obviously. The map and fuel pump and injectors also have an effect on the power gains you'll make.
Extending exhaust or intake durations can alter the power band and on most engines the exhaust and intake durations do not need to match, although most cams and DIY tuners use matched pairs there are some advantages to extending the intake or exhaust durations. Please watch our video which covers the 5 principles of tuning your car. Be sure to subscribe and support our new channel. In some cases, as we find here, the factory ECU is locked flashing is not an option, so an aftermarket ECU is the route to take, and many of these will outperform factory ECU's but make sure it has knock protection and that you get it set up properly.
Some of our members recommended the following aftermarket ECU's from their projects. You'll generally find harnesses available now for most of the aftermarket ECU options for these engines. Never judge a map by the peak power figures that are quoted, you really need to see the dyno plot to see the whole story and look at the torque curve, this in our opinion is far more important than the bhp figures quoted.
In the chart above you'll see torque plots for 3 comparative tuned engines, the bhp map seems better, that is until you look at the graph and see it has a spike in a narrow part of the RPM range. The Green plot shows a better map, and although it makes less peak power, it gives more power through the RPM range.
On an engine like the RB25 you want the turbo to spool up quite quickly and deliver power gains right through to the redline. Intake headers take the air from the air filter and allow it to be fed into the engine and mixed with fuel. The fewer bends this has the better you results will be. Design and flow characteristics of the Intake headers can make a big effect on fuel engine efficiency on the RB Because the filter is in the warm engine compartment, it draws in warm air with less oxygen, reducing power.
Thankfully, after a mile or so, the engine compartment air temperature drops to ambient. Installing a cold air supply pipe from outside the engine bay will assist. Engines with induction kits often gain power at high RPMs, if at all. Because they filter less, induction kits flow better than paper elements. A paper OEM filter will always be more effective than an induction kit.
No, the quality varies greatly. A cotton gauze filter is recommended. They frequently outperform basic filter-only kits, especially if they have a cold air feed pipe to channel cold air towards them rather than hot engine bay air, and a cold air feed pipe to channel cold air towards them.
If the OEM airbox supply is NOT severely restricted, you will experience little to no power improvement by installing one. For those who wish to improve their vehicle, an induction kit can be handy as it releases power by removing a restriction.
It is worth looking at the Apexi dual funnel Power Intake this is well designed and helps your tuned RB25 breathe more easily. Oil cooling is required and highly recommended on spirited use, as these run quite hot so keep an eye on the oil temps. Also if you are drifting or frequently highly revving the motor there is too much oil in the head and this causes the crank bearings to fail. To help with this issue you can remove the two 1. Also add an oil drain to the back of the head and connect that to your turbo drain side to allow more oil to flow out of the head.
The R33 GTR Fuel pump is a straight drop in and good for odd BHP so becomes an obvious choice for the tuner, with the added benefit that these are quite easy to source in the used markets. The standard fuel injectors usually hit the maximum at around BHP. Turbos have issues with the cold intake charge being near to the hot exhaust temperatures.
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