![]() ![]() A cold air intake to the filter from the front of your Skyline will also give you a performance advantage. If you choose to go the POD filter route I recommend you fabricate some type of shield to keep hot air from the engine bay away from your intake. Either use a high performance air filter, or replace the air box with a POD style air filter. Now we have the exhaust side of the engine breathing the next step is to get more air into the engine. From here a high quality 3" high flow cat should be used, then 3" all the way to the back of the car with high flow mufflers. The new exhaust should start from the turbo with a dump pipe either a 3" open bell mouth or better still a split dump to separate the gases from the turbine and wastegate. ![]() A good free flowing exhaust will have the RB sounding great, turbo lag will be reduced, and power gained throughout the rev range. ![]() The RB25DET NEO is a sweet sounding engine but very quiet in standard form and as with most factory turbo cars the exhaust causes a huge restriction. Cooling has also been improved with a larger more efficent intercooler. The turbo has a slightly larger exaust housing and a nylon compressor wheel. Power was increased to 206kw with more torque availible earlier in the rev range. The main difference is the NEO head which has a new varible valve timing system, revised cam profiles, and solid lifters. That's one of the advantages of an AFM sensor driven ecu.The R34 GTT replaced the Nissan Skyline R33 GTS25T and features a upgraded version of the RB25DET. It simply doesn't need to, as long as it knows the airflow (via the afm) then it can do its job of matching fuel and air. On some cars the PFC doesn't even know the boost level (no map sensor). Obviously a Power FC without a Boost Control Kit fitted still works fine, there is no boost table to set. The AFM measured the airflow and the ecu tells the injectors how much fuel to squirt according to the maps you have loaded. Whether you get there at 1 bar or 3 bar is irrelevant. You tune the maps for the maximum airflow you want to run. All this does is enable the ECU to tell the boost control solenoid when (how often) to close so as to limit the boost to that level. If you want 1 bar then select 1 Bar, if you want 1.5 bar then select 1.5 bar. The 4 boost settings on the PFC are exactly that 4 BOOST SETTINGS. I am not sure I understand this thread at all, it doesn't make sense to me. ![]()
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May 2023
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