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| - The air intake controls the air/fuel mix going into the combustion chamber of the engine. Cars rolling off the production usually have restrictions on air flow most often a silencer, in order to reduce noise, which creates turbulence and so reduces power. For an increase in performance, the silencer should be removed or the stock part replaced altogether. In the case of cars wielding a turbocharger or supercharger, a refined air intake system is a must. In Forza, most cars, if not all, have the option of stock intake, street intake, sport intake and finally race intake.
- On the 96-Present DR650SE's the intake system is the most restrictive part of the motorcycle in overall performance and smooth operation. In stock condition the air box and it's rubber intake "snorkel" (part 14) severely restrict air flow capabilities through the engine. There are a host of mods that have been done to increase air flow like removing the snorkel, removing the air box side cover (6), removing the air boot screen (5), modifying the top of the airbox Other air flow improving techniques involve adding one or multiple filtered vents, velocity stacks or just plain drilling holes in the plastic box. Whatever mod you decide to do requires the proper carb jetting to keep the air/fuel ratio at the proper levels. Standard on the Mikuni BST 40SS carb is; main 140, pilot 42.5, needle 6F
- Intakes are the hydrogen ram scoops on the front of the spacecraft which fuel it by gathering the free hydrogen in the space or in the extreme upper atmosphere of gas giants. They refill the fuel tank of the ship.
- The factory SX4 intake is by no means ideal. It was designed for a balance of performance, protection, and ..... noise reduction. Noise reduction? Yes, the factory intake is far from a 'performance' design, despite what some would have you believe. The main faults with the factory system are the size and placement of the plastic chamber. While the large cavity presented by the factory intake is good for reducing unwanted noise, vibration, and harshness (NVH) as well as resonance from the engine it does so at the direct expense of air flow. The factory system has several twists and turns before the throttle body, increasing the volume of the intake as well as reducing the velocity of the air within. To make a car-related comparison, the factory intake is like a winding road, and the air is
- Carburetor Vacuum Ports by Lars. Manifold, Ported, and Venturi Vacuum Explained <a href="http://www.corvettefaq.com/c3/HowToAdjustPowerPiston.doc">http://www.corvettefaq.com/c3/HowToAdjustPowerPiston.doc</a> How to Adjust Power Piston in Quadrajet Word Doc by Lars <a href="http://www.corvettefaq.com/c3/IntakeDeposits.mht.zip">http://www.corvettefaq.com/c3/IntakeDeposits.mht.zip</a> Cleaning Intake Deposits with Water IE Archive - zipped Quadrajet Carb & Idle Problem Tech tip by Lars <a href="http://www.carburetion.com/quadrajet.asp">http://www.carburetion.com/quadrajet.asp</a> Quadrajet Parts Including electric choke conversion <a href="http://www.corvettefaq.com/c3/QJetTroubleshoot.mht.zip">http://www.corvettefaq.com/c3/QJetTroubleshoot.mht.zip</a> Quadrajet Troubleshooting Excellent info from Lars - zipped
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| abstract
| - The factory SX4 intake is by no means ideal. It was designed for a balance of performance, protection, and ..... noise reduction. Noise reduction? Yes, the factory intake is far from a 'performance' design, despite what some would have you believe. The main faults with the factory system are the size and placement of the plastic chamber. While the large cavity presented by the factory intake is good for reducing unwanted noise, vibration, and harshness (NVH) as well as resonance from the engine it does so at the direct expense of air flow. The factory system has several twists and turns before the throttle body, increasing the volume of the intake as well as reducing the velocity of the air within. To make a car-related comparison, the factory intake is like a winding road, and the air is like a car. The car will never reach it's maximum potential speed if it is stuck on such a winding road; it must brake and slow down at each corner instead. In addition, the intake sits directly over the hot valve cover where it soaks up the heat from the engine. A replacement for the factory intake would ideally 1) use the same size tube as the stock MAF (to avoid an error code)2) have as few bends and restrictions as possible3) obtain air from a cool, protected locationLuckily, there are three such intakes available off the shelf; two made by Road///Race Motorsports and one by TurbineTech. The three intakes fall into two categories: short ram intakes and cold air intakes. - The short ram by RRM is designed to ingest air from behind the grill in the area next to the battery, safe from water and slush spraying up into the engine compartment due to standing water puddles or other hazards. The short ram intake (SRI) chiefly benefits the mid-to-low range of the torque curve, as well as increasing response of the E-Throttle system. The SRI fits either manual or automatic SX4s. - The cold air intake by RRM is designed to ingest air from the cooler, lower pressure open area below the headlight. It is less resistant to standing water or road hazards due to the location, but in return draws cooler, denser air into the engine. The cold air intake (CAI) is designed to increase high-rpm power as well as increase responsiveness of the engine. The CAI fits only manual transmission SX4s. - The cold air intake by Turbine Tech is very similar to the RRM CAI, but places the filter in a slightly different location higher up in the engine compartment; which may slightly increase safety from road hazards while slightly reducing maximum performance. The TT intake is made of three separate pieces welded together, giving it a different look than the one-piece RRM intakes. The Turbine Tech CAI does not specify whether it fits automatics or not; but from looking at the position of the filter I would guess it does not.
- On the 96-Present DR650SE's the intake system is the most restrictive part of the motorcycle in overall performance and smooth operation. In stock condition the air box and it's rubber intake "snorkel" (part 14) severely restrict air flow capabilities through the engine. There are a host of mods that have been done to increase air flow like removing the snorkel, removing the air box side cover (6), removing the air boot screen (5), modifying the top of the airbox Other air flow improving techniques involve adding one or multiple filtered vents, velocity stacks or just plain drilling holes in the plastic box. Whatever mod you decide to do requires the proper carb jetting to keep the air/fuel ratio at the proper levels. Standard on the Mikuni BST 40SS carb is; main 140, pilot 42.5, needle 6F19 clip on 3rd slot (Australian, Canadian and UK needle). All US models use a 6F23 fixed clip position jet needle and a Y-5M needle jet. The most popular jetting kit for the stock carb is Dynamometer repair The most complete kit is Procycle's stock carb jet kit. Other options are Factory Pro's kit... This kit is based on leaving the air box in it's stock form. There is a ton of information here on these and other jetting mods for the stock CV carb.
* Jetting Kit Installation Information The simplest mod for an otherwise stock system is to simply remove the snorkel, readjust the pilot circuit and raise the needle .5 -1mm. Here is an excellent pictorial write up on this proccess by jessepitt over on ADVrider. When swapping info with other DR riders do not forget the size difference between Mikuni and DynoJet main jets ie a Mikuni 140 is roughly equivalent to a DJ 150. Mods to the stock intake system can include:
* Adjusting the very lean factory set pilot circuit. Remove the factory installed pilot screw access plug by increasing the weep hole size so you can screw in a wood screw or sheetmetal screw to remove the plug. Most machines run very well with the pilot screw set between 1 and 1-1/4 turns out from lightly seated.
* Removing the snorkel (More air).
* Raising the stock needle .5-1mm (Best for stock in combination with snorkel removal).
* Drilling 2nd hole in carb slide (Improve slide response speed).
* Shortening the diaphram spring (Decrease the preload - increase slide speed some more).
* New Y-5M needle jet (If the OEM one wears you get a big off idle bog and it will seem to run rich).
* Opening the top of the airbox (Even more air but needs a complete re-jet using the Procycle or Dynojet kits mentioned above). You need to read the above threads to get a grasp of what (if any) benefit these would be on your bike in your situation. Of course if you really want to boost performance, throttle response and engine smoothness you have to remove the CV carb and replace it with a direct operated slide carb like Keihin's FCR series carb or Mikuni's TM series carb. For the super industrious there is no doubt a fuel injection system would be the ultimate addition but the work required to fab your own system would be a large undertaking.... starting here. There is now a fuel injection kit available for the DR from Ecotrons which looks very promising. Over in the DRRider forum there is testing and discussion of the Ecotrons DR650 Fuel Injection Project. Here's a link to mxrob's DR650 Fuel Injection Project on Thumpertalk. Here's the condensed version of mxrob's Fuel injection project on msruns.com.
- The air intake controls the air/fuel mix going into the combustion chamber of the engine. Cars rolling off the production usually have restrictions on air flow most often a silencer, in order to reduce noise, which creates turbulence and so reduces power. For an increase in performance, the silencer should be removed or the stock part replaced altogether. In the case of cars wielding a turbocharger or supercharger, a refined air intake system is a must. In Forza, most cars, if not all, have the option of stock intake, street intake, sport intake and finally race intake.
- Intakes are the hydrogen ram scoops on the front of the spacecraft which fuel it by gathering the free hydrogen in the space or in the extreme upper atmosphere of gas giants. They refill the fuel tank of the ship. Intake upgrades alter the effectiveness and the profile of the vehicle; the more effectively a ship takes in fuel the more efficient its engines. The tradeoff is that, unless countermeasures are installed, this also increases the radar signature. The appearance of the ship is altered as well: more primitive intakes look like physical fan blades, others glow different colors as heat capacity increases.
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