2G Turbo DSM Upgrade Path Stage:

Do not proceed unless you have successfully completed the stage 1 modifications.

1) Front Mount Intercooler - FMIC - The crappy stock side mount intercooler is now a serious bottle neck in your intake system, get rid of it and replace it with a more highly efficient front mount setup. Another option that has proven to be effective is the MKVII supra side mount intercooler. The stock intercooler flows between 400 and 500 cfm, as you can see since a normal big 16G flows 545 cfm a bottle neck occurs. The supra unit flows around 650 to 700 cfm while a front mount unit like mine flows 905 cfm. Besides the fact that there is a flow bottle neck there is a heat problem, as you know when air is compressed in close quarters with the exhaust manifold the air becomes hot, hot air can cause detonation which will kill your engine. The solution is what can be related as a radiator for air, the intercooler allows outside air to cool the air charge from the turbo. When this air charge becomes too hot for the intercooler to handel the interooler becomes a heat sink rather than an intercooler. At this point your lookin at high intake temperatures and lean conditions. Don't skimp out, if you have the ability, knowledge and tools to build your own piping then that is a great way to save money otherwise buy the kit.

2) Injectors - This is a modification that requires some real honesty with yourself, where is this car going? if you are lookin at a 16G, Big 16G, Evo 3 16G or something of the like you won't need anything over 550cc. The stock is 450cc. The best deal for the 550cc is the Lucas/RC Engineering set. Injectors are also sold in 660cc, 720cc, and I believe 880cc. The latter two will probably only be necessary for a dedicated drag race car that will be running boost greater than 25psi. The 660cc are a perfect match with the 20G turbo and will allow some boost/tuning headroom. Some way of controlling these injectors will be necessary or the car won't even idle, I'm familiar with the S-AFC, but HKS makes what they call a VPC and that is supposed to be very good.

3) Super AFC - Air Fuel Controller. Since you are now running injectors bigger than stock and there is no way to tell your ECU of your new upgrades, a way to control your air/fuel mixture is in order. What the Super Air Fuel Controller does is it takes the signal from the MAS converts it to either tell the computer that it is running more or less air than the MAS actually sees. Take for instance a stock car, the MAS tells the computer, by alternating an input frequency, how much air is being pushed into the intake, the computer takes this value and looks in a preprogrammed table as to how much fuel to add, it adds that fuel and you are on your way. Now your upgrade to say 550cc injectors, these are about 18% percent bigger than your stock injectors and if the computer treats these the same then you will be injecting 18% more fuel into your car at all times, even at idle, this will produce an extremely rich condition which will cause your car to stall out. What the S-AFC does is it tells the computer that it is seeing 18% less air than the MAS is acutally reading, this makes the computer look up a lower amount of fuel to inject and voila! your car runs smooth, the real beauty of the S-AFC can be seen when your tune your car wide open throttle using 02 voltage and EGT to find the sweet spot where your car is running stoich and is making the most power. Never fear I will be writing a tech article about how to tune the S-AFC soon enough.

4) DSM link/Pocketlogger - logging software - This is where my knowlege is only aquired but what I read rather than what I have actually had experiance with. DSM link/Pocketlogger software allows you to log (thru the OBD 2 plug) just about every parameter of your engine that your ECU sees. For you trying to maximize your modifications safely this is the ticket. You can log your RPM, timing, speed, 02 sensor voltage along with a virtual plethora of other information during a pull so that you can analyze it from the comfort of your home and make changes. The way that I suggested to tune your car using the 02, EGT, S-AFC method, can get you close to making max power, The logging software allows you to monitor something that no other gauge can, timing. A popular fix for knocking (the beginings of detonation) is to retard timing. Once the computer detects knock it retards timing in order to keep your motor happy. The common question that arises on the boards is "I cranked up the boost but the car dosn't feel faster, why?" The reason for this is that with the increase in boost came a retard in timing, this kills the slingshot effect on the piston and kills hp and torque. Logging software allows you to watch timing and find the boost and fuel trim that is best for your car. If you plan on AEM EMS in the future then the pocketlogger is not for you, the EMS will allow you to monitor every parameter of your engine and change it to your liking so you are wasting your money with a pocket logger.

This is where my DSM knowledge ends I don't have any more info for ya, anything past this and ur on your own.

Page
1 - Home
2 - 2G Turbo DSM Upgrade Path Stage 1
4 - Friends Rides
5 - Tuning the S-AFC
6 - In Da Shop Pics
7 - Pocketlogging 101
8 - Pocketlogging 101 Part 2