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Practical Reflash Tuning: Step 2: What modifications have been performed?

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Step 2: What modifications have been performed?


00:00 - Before we can start making any tuning changes it's always a good idea to start with a thorough understanding of what modifications have been performed to the engine.
00:10 What we're looking at here is any hardware modifications bolted to the engine such as exhaust systems and intakes, as well as any internal components that may be changed on the engine.
00:20 Such as perhaps a set of high compression pistons or larger more aggressive cams.
00:25 We also need to consider the fuel system.
00:28 And in particular whether a set of larger injectors has been fitted.
00:32 If we don't understand what modifications have been made it can waste a lot of time while we try and get the engine running on a calibration that really isn't suited to the level of modifications.
00:43 In some instances this can also end up potentially damaging our engine if we overlook something critical.
00:50 Now in our case this engine is almost completely standard.
00:53 The engine itself is internally standard and it's just benefitted from some basic bolt on modifications.
01:01 In particular a stainless set of four into one headers, coupled to a 2.5 inch free flow exhaust system.
01:07 Because this engine is being used for competition use only, the catalytic converter has been removed.
01:14 On the inlet side of the engine, the K20 has shown to benefit from a properly designed free flow intake.
01:21 In this case a Password JDM carbon fibre system has been fitted.
01:26 That really covers off the key modifications made on the outside of the engine.
01:32 It's still running a completely stock fuel system which is more than capable of supporting this level of modification.
01:37 In terms of the fuel, we are running on our locally delivered 98 octane pump fuel.
01:43 And this is shown with a stock K20, that we shouldn't have too much trouble with detonation once we get started with the tuning process.
01:52 Now with these modifications in mind, what we know is that the air flow through the engine should be improved over stock.
02:00 Now particularly with that exhaust and intake system, we should see quite a significant improvement in air flow at high RPM.
02:08 We need to take this into account with our calibration.